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From trus...@apache.org
Subject svn commit: r370807 [11/22] - in /directory/sandbox/trustin/mina-spi: ./ core/src/main/java/org/apache/mina/common/ core/src/main/java/org/apache/mina/common/support/ core/src/main/java/org/apache/mina/common/support/discovery/ core/src/main/java/org/a...
Date Fri, 20 Jan 2006 13:48:55 GMT
Propchange: directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/StringUtils.java
------------------------------------------------------------------------------
    svn:keywords = HeadURL Id LastChangedBy LastChangedDate LastChangedRevision

Added: directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/SystemUtils.java
URL: http://svn.apache.org/viewcvs/directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/SystemUtils.java?rev=370807&view=auto
==============================================================================
--- directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/SystemUtils.java (added)
+++ directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/SystemUtils.java Fri Jan 20 05:47:50 2006
@@ -0,0 +1,1333 @@
+/*
+ * Copyright 2002-2005 The Apache Software Foundation.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.mina.common.support.lang;
+
+import java.io.File;
+
+/**
+ * <p>Helpers for <code>java.lang.System</code>.</p>
+ * 
+ * <p>If a system property cannot be read due to security restrictions, 
+ * the corresponding field in this class will be set to <code>null</code>
+ * and a message will be written to <code>System.err</code>.</p>
+ *
+ * @author Based on code from Avalon Excalibur
+ * @author Based on code from Lucene
+ * @author Stephen Colebourne
+ * @author <a href="mailto:sdowney@panix.com">Steve Downey</a>
+ * @author Gary Gregory
+ * @author Michael Becke
+ * @author Tetsuya Kaneuchi
+ * @author Rafal Krupinski
+ * @author Jason Gritman
+ * @since 1.0
+ * @version $Id$
+ */
+public class SystemUtils {
+
+    /**
+     * The prefix String for all Windows OS.
+     */
+    private static final String OS_NAME_WINDOWS_PREFIX = "Windows";
+    
+    // System property constants
+    //-----------------------------------------------------------------------
+    // These MUST be declared first. Other constants depend on this.
+    
+    /**
+     * The System property key for the user home directory.
+     */
+    private static final String USER_HOME_KEY = "user.home";
+
+    /**
+     * The System property key for the user directory.
+     */
+    private static final String USER_DIR_KEY = "user.dir";
+    
+    /**
+     * The System property key for the Java IO temporary directory.
+     */
+    private static final String JAVA_IO_TMPDIR_KEY = "java.io.tmpdir";
+    
+    /**
+     * The System property key for the Java home directory.
+     */
+    private static final String JAVA_HOME_KEY = "java.home";
+    
+    /**
+     * <p>The <code>awt.toolkit</code> System Property.</p>
+     * <p>Holds a class name, on Windows XP this is <code>sun.awt.windows.WToolkit</code>.</p>
+     * <p><b>On platforms without a GUI, this value is <code>null</code>.</b></p>
+     * 
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.1
+     */
+    public static final String AWT_TOOLKIT = getSystemProperty("awt.toolkit");
+
+    /**
+     * <p>The <code>file.encoding</code> System Property.</p>
+     * <p>File encoding, such as <code>Cp1252</code>.</p>
+     * 
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.0
+     * @since Java 1.2
+     */
+    public static final String FILE_ENCODING = getSystemProperty("file.encoding");
+
+    /**
+     * <p>The <code>file.separator</code> System Property.
+     * File separator (<code>&quot;/&quot;</code> on UNIX).</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String FILE_SEPARATOR = getSystemProperty("file.separator");
+
+    /**
+     * <p>The <code>java.awt.fonts</code> System Property.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.1
+     */
+    public static final String JAVA_AWT_FONTS = getSystemProperty("java.awt.fonts");
+
+    /**
+     * <p>The <code>java.awt.graphicsenv</code> System Property.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.1
+     */
+    public static final String JAVA_AWT_GRAPHICSENV = getSystemProperty("java.awt.graphicsenv");
+
+    /**
+     * <p>
+     * The <code>java.awt.headless</code> System Property.
+     * The value of this property is the String <code>"true"</code> or <code>"false"</code>. 
+     * </p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @see #isJavaAwtHeadless()
+     * @since 2.1
+     * @since Java 1.4
+     */
+    public static final String JAVA_AWT_HEADLESS = getSystemProperty("java.awt.headless");
+
+    /**
+     * <p>The <code>java.awt.printerjob</code> System Property.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.1
+     */
+    public static final String JAVA_AWT_PRINTERJOB = getSystemProperty("java.awt.printerjob");
+
+    /**
+     * <p>The <code>java.class.path</code> System Property. Java class path.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String JAVA_CLASS_PATH = getSystemProperty("java.class.path");
+
+    /**
+     * <p>The <code>java.class.version</code> System Property.
+     * Java class format version number.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String JAVA_CLASS_VERSION = getSystemProperty("java.class.version");
+
+    /**
+     * <p>The <code>java.compiler</code> System Property. Name of JIT compiler to use.
+     * First in JDK version 1.2. Not used in Sun JDKs after 1.2.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.2. Not used in Sun versions after 1.2.
+     */
+    public static final String JAVA_COMPILER = getSystemProperty("java.compiler");
+
+    /**
+     * <p>The <code>java.endorsed.dirs</code> System Property. Path of endorsed directory
+     * or directories.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.4
+     */
+    public static final String JAVA_ENDORSED_DIRS = getSystemProperty("java.endorsed.dirs");
+
+    /**
+     * <p>The <code>java.ext.dirs</code> System Property. Path of extension directory
+     * or directories.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.3
+     */
+    public static final String JAVA_EXT_DIRS = getSystemProperty("java.ext.dirs");
+
+    /**
+     * <p>The <code>java.home</code> System Property. Java installation directory.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String JAVA_HOME = getSystemProperty(JAVA_HOME_KEY);
+
+    /**
+     * <p>The <code>java.io.tmpdir</code> System Property. Default temp file path.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.2
+     */
+    public static final String JAVA_IO_TMPDIR = getSystemProperty(JAVA_IO_TMPDIR_KEY);
+
+    /**
+     * <p>The <code>java.library.path</code> System Property. List of paths to search
+     * when loading libraries.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.2
+     */
+    public static final String JAVA_LIBRARY_PATH = getSystemProperty("java.library.path");
+
+    /**
+     * <p>The <code>java.runtime.name</code> System Property. Java Runtime Environment
+     * name.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.0
+     * @since Java 1.3
+     */
+    public static final String JAVA_RUNTIME_NAME = getSystemProperty("java.runtime.name");
+
+    /**
+     * <p>The <code>java.runtime.version</code> System Property. Java Runtime Environment
+     * version.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.0
+     * @since Java 1.3
+     */
+    public static final String JAVA_RUNTIME_VERSION = getSystemProperty("java.runtime.version");
+
+    /**
+     * <p>The <code>java.specification.name</code> System Property. Java Runtime Environment
+     * specification name.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.2
+     */
+    public static final String JAVA_SPECIFICATION_NAME = getSystemProperty("java.specification.name");
+
+    /**
+     * <p>The <code>java.specification.vendor</code> System Property. Java Runtime Environment
+     * specification vendor.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.2
+     */
+    public static final String JAVA_SPECIFICATION_VENDOR = getSystemProperty("java.specification.vendor");
+
+    /**
+     * <p>The <code>java.specification.version</code> System Property. Java Runtime Environment
+     * specification version.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.3
+     */
+    public static final String JAVA_SPECIFICATION_VERSION = getSystemProperty("java.specification.version");
+
+    /**
+     * <p>The <code>java.util.prefs.PreferencesFactory</code> System Property. A class name.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.1
+     * @since Java 1.4
+     */
+    public static final String JAVA_UTIL_PREFS_PREFERENCES_FACTORY = 
+        getSystemProperty("java.util.prefs.PreferencesFactory");
+
+    /**
+     * <p>The <code>java.vendor</code> System Property. Java vendor-specific string.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String JAVA_VENDOR = getSystemProperty("java.vendor");
+
+    /**
+     * <p>The <code>java.vendor.url</code> System Property. Java vendor URL.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+    */
+    public static final String JAVA_VENDOR_URL = getSystemProperty("java.vendor.url");
+
+    /**
+     * <p>The <code>java.version</code> System Property. Java version number.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String JAVA_VERSION = getSystemProperty("java.version");
+
+    /**
+     * <p>The <code>java.vm.info</code> System Property. Java Virtual Machine implementation
+     * info.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.0
+     * @since Java 1.2
+     */
+    public static final String JAVA_VM_INFO = getSystemProperty("java.vm.info");
+
+    /**
+     * <p>The <code>java.vm.name</code> System Property. Java Virtual Machine implementation
+     * name.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.2
+     */
+    public static final String JAVA_VM_NAME = getSystemProperty("java.vm.name");
+
+    /**
+     * <p>The <code>java.vm.specification.name</code> System Property. Java Virtual Machine
+     * specification name.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.2
+     */
+    public static final String JAVA_VM_SPECIFICATION_NAME = getSystemProperty("java.vm.specification.name");
+
+    /**
+     * <p>The <code>java.vm.specification.vendor</code> System Property. Java Virtual
+     * Machine specification vendor.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.2
+     */
+    public static final String JAVA_VM_SPECIFICATION_VENDOR = getSystemProperty("java.vm.specification.vendor");
+
+    /**
+     * <p>The <code>java.vm.specification.version</code> System Property. Java Virtual Machine
+     * specification version.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.2
+     */
+    public static final String JAVA_VM_SPECIFICATION_VERSION = getSystemProperty("java.vm.specification.version");
+
+    /**
+     * <p>The <code>java.vm.vendor</code> System Property. Java Virtual Machine implementation
+     * vendor.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.2
+     */
+    public static final String JAVA_VM_VENDOR = getSystemProperty("java.vm.vendor");
+
+    /**
+     * <p>The <code>java.vm.version</code> System Property. Java Virtual Machine
+     * implementation version.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.2
+     */
+    public static final String JAVA_VM_VERSION = getSystemProperty("java.vm.version");
+
+    /**
+     * <p>The <code>line.separator</code> System Property. Line separator
+     * (<code>&quot;\n&quot;</code> on UNIX).</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String LINE_SEPARATOR = getSystemProperty("line.separator");
+
+    /**
+     * <p>The <code>os.arch</code> System Property. Operating system architecture.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String OS_ARCH = getSystemProperty("os.arch");
+
+    /**
+     * <p>The <code>os.name</code> System Property. Operating system name.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String OS_NAME = getSystemProperty("os.name");
+
+    /**
+     * <p>The <code>os.version</code> System Property. Operating system version.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String OS_VERSION = getSystemProperty("os.version");
+
+    /**
+     * <p>The <code>path.separator</code> System Property. Path separator
+     * (<code>&quot;:&quot;</code> on UNIX).</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String PATH_SEPARATOR = getSystemProperty("path.separator");
+
+    /**
+     * <p>The <code>user.country</code> or <code>user.region</code> System Property.
+     * User's country code, such as <code>GB</code>. First in JDK version 1.2 as
+     * <code>user.region</code>. Renamed to <code>user.country</code> in 1.4</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.0
+     * @since Java 1.2
+     */
+    public static final String USER_COUNTRY = 
+        (getSystemProperty("user.country") == null ?
+            getSystemProperty("user.region") : getSystemProperty("user.country"));
+
+    /**
+     * <p>The <code>user.dir</code> System Property. User's current working
+     * directory.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String USER_DIR = getSystemProperty(USER_DIR_KEY);
+
+    /**
+     * <p>The <code>user.home</code> System Property. User's home directory.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String USER_HOME = getSystemProperty(USER_HOME_KEY);
+
+    /**
+     * <p>The <code>user.language</code> System Property. User's language code,
+     * such as <code>"en"</code>.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.0
+     * @since Java 1.2
+     */
+    public static final String USER_LANGUAGE = getSystemProperty("user.language");
+
+    /**
+     * <p>The <code>user.name</code> System Property. User's account name.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since Java 1.1
+     */
+    public static final String USER_NAME = getSystemProperty("user.name");
+
+    /**
+     * <p>The <code>user.timezone</code> System Property. 
+     * For example: <code>"America/Los_Angeles"</code>.</p>
+     *
+     * <p>Defaults to <code>null</code> if the runtime does not have
+     * security access to read this property or the property does not exist.</p>
+     * 
+     * <p>
+     * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
+     * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
+     * will be out of sync with that System property.
+     * </p>
+     * 
+     * @since 2.1
+     */
+    public static final String USER_TIMEZONE = getSystemProperty("user.timezone");
+
+    // Java version
+    //-----------------------------------------------------------------------
+    // This MUST be declared after those above as it depends on the
+    // values being set up
+
+    /**
+     * <p>Gets the Java version as a <code>String</code> trimming leading letters.</p>
+     *
+     * <p>The field will return <code>null</code> if {@link #JAVA_VERSION} is <code>null</code>.</p>
+     * 
+     * @since 2.1
+     */
+    public static final String JAVA_VERSION_TRIMMED = getJavaVersionTrimmed();
+
+    // Java version values
+    //-----------------------------------------------------------------------
+    // These MUST be declared after the trim above as they depend on the
+    // value being set up
+
+    /**
+     * <p>Gets the Java version as a <code>float</code>.</p>
+     *
+     * <p>Example return values:</p>
+     * <ul>
+     *  <li><code>1.2f</code> for JDK 1.2
+     *  <li><code>1.31f</code> for JDK 1.3.1
+     * </ul>
+     *
+     * <p>The field will return zero if {@link #JAVA_VERSION} is <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final float JAVA_VERSION_FLOAT = getJavaVersionAsFloat();
+
+    /**
+     * <p>Gets the Java version as an <code>int</code>.</p>
+     *
+     * <p>Example return values:</p>
+     * <ul>
+     *  <li><code>120</code> for JDK 1.2
+     *  <li><code>131</code> for JDK 1.3.1
+     * </ul>
+     *
+     * <p>The field will return zero if {@link #JAVA_VERSION} is <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final int JAVA_VERSION_INT = getJavaVersionAsInt();
+
+    // Java version checks
+    //-----------------------------------------------------------------------
+    // These MUST be declared after those above as they depend on the
+    // values being set up
+    
+    /**
+     * <p>Is <code>true</code> if this is Java version 1.1 (also 1.1.x versions).</p>
+     *
+     * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
+     * <code>null</code>.</p>
+     */
+    public static final boolean IS_JAVA_1_1 = getJavaVersionMatches("1.1");
+
+    /**
+     * <p>Is <code>true</code> if this is Java version 1.2 (also 1.2.x versions).</p>
+     *
+     * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
+     * <code>null</code>.</p>
+     */
+    public static final boolean IS_JAVA_1_2 = getJavaVersionMatches("1.2");
+
+    /**
+     * <p>Is <code>true</code> if this is Java version 1.3 (also 1.3.x versions).</p>
+     *
+     * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
+     * <code>null</code>.</p>
+     */
+    public static final boolean IS_JAVA_1_3 = getJavaVersionMatches("1.3");
+
+    /**
+     * <p>Is <code>true</code> if this is Java version 1.4 (also 1.4.x versions).</p>
+     *
+     * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
+     * <code>null</code>.</p>
+     */
+    public static final boolean IS_JAVA_1_4 = getJavaVersionMatches("1.4");
+
+    /**
+     * <p>Is <code>true</code> if this is Java version 1.5 (also 1.5.x versions).</p>
+     *
+     * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
+     * <code>null</code>.</p>
+     */
+    public static final boolean IS_JAVA_1_5 = getJavaVersionMatches("1.5");
+
+    // Operating system checks
+    //-----------------------------------------------------------------------
+    // These MUST be declared after those above as they depend on the
+    // values being set up
+    // OS names from http://www.vamphq.com/os.html
+    // Selected ones included - please advise commons-dev@jakarta.apache.org
+    // if you want another added or a mistake corrected
+
+    /**
+     * <p>Is <code>true</code> if this is AIX.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_AIX = getOSMatches("AIX");
+
+    /**
+     * <p>Is <code>true</code> if this is HP-UX.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_HP_UX = getOSMatches("HP-UX");
+
+    /**
+     * <p>Is <code>true</code> if this is Irix.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_IRIX = getOSMatches("Irix");
+
+    /**
+     * <p>Is <code>true</code> if this is Linux.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_LINUX = getOSMatches("Linux") || getOSMatches("LINUX");
+
+    /**
+     * <p>Is <code>true</code> if this is Mac.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_MAC = getOSMatches("Mac");
+
+    /**
+     * <p>Is <code>true</code> if this is Mac.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_MAC_OSX = getOSMatches("Mac OS X");
+
+    /**
+     * <p>Is <code>true</code> if this is OS/2.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_OS2 = getOSMatches("OS/2");
+
+    /**
+     * <p>Is <code>true</code> if this is Solaris.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_SOLARIS = getOSMatches("Solaris");
+
+    /**
+     * <p>Is <code>true</code> if this is SunOS.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_SUN_OS = getOSMatches("SunOS");
+
+    /**
+     * <p>Is <code>true</code> if this is a POSIX compilant system,
+     * as in any of AIX, HP-UX, Irix, Linux, MacOSX, Solaris or SUN OS.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.1
+     */
+    public static final boolean IS_OS_UNIX =
+        IS_OS_AIX || IS_OS_HP_UX || IS_OS_IRIX || IS_OS_LINUX ||
+        IS_OS_MAC_OSX || IS_OS_SOLARIS || IS_OS_SUN_OS;
+
+    /**
+     * <p>Is <code>true</code> if this is Windows.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_WINDOWS = getOSMatches(OS_NAME_WINDOWS_PREFIX);
+
+    /**
+     * <p>Is <code>true</code> if this is Windows 2000.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_WINDOWS_2000 = getOSMatches(OS_NAME_WINDOWS_PREFIX, "5.0");
+
+    /**
+     * <p>Is <code>true</code> if this is Windows 95.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_WINDOWS_95 = getOSMatches(OS_NAME_WINDOWS_PREFIX + " 9", "4.0");
+    // JDK 1.2 running on Windows98 returns 'Windows 95', hence the above
+
+    /**
+     * <p>Is <code>true</code> if this is Windows 98.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_WINDOWS_98 = getOSMatches(OS_NAME_WINDOWS_PREFIX + " 9", "4.1");
+    // JDK 1.2 running on Windows98 returns 'Windows 95', hence the above
+
+    /**
+     * <p>Is <code>true</code> if this is Windows ME.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_WINDOWS_ME = getOSMatches(OS_NAME_WINDOWS_PREFIX, "4.9");
+    // JDK 1.2 running on WindowsME may return 'Windows 95', hence the above
+
+    /**
+     * <p>Is <code>true</code> if this is Windows NT.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_WINDOWS_NT = getOSMatches(OS_NAME_WINDOWS_PREFIX + " NT");
+    // Windows 2000 returns 'Windows 2000' but may suffer from same JDK1.2 problem
+
+    /**
+     * <p>Is <code>true</code> if this is Windows XP.</p>
+     *
+     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
+     * <code>null</code>.</p>
+     * 
+     * @since 2.0
+     */
+    public static final boolean IS_OS_WINDOWS_XP = getOSMatches(OS_NAME_WINDOWS_PREFIX, "5.1");
+
+    //-----------------------------------------------------------------------    
+    /**
+     * <p>SystemUtils instances should NOT be constructed in standard
+     * programming. Instead, the class should be used as
+     * <code>SystemUtils.FILE_SEPARATOR</code>.</p>
+     *
+     * <p>This constructor is public to permit tools that require a JavaBean
+     * instance to operate.</p>
+     */
+    public SystemUtils() {
+        // no init.
+    }
+    
+    //-----------------------------------------------------------------------    
+    /**
+     * <p>Gets the Java version number as a <code>float</code>.</p>
+     *
+     * <p>Example return values:</p>
+     * <ul>
+     *  <li><code>1.2f</code> for JDK 1.2
+     *  <li><code>1.31f</code> for JDK 1.3.1
+     * </ul>
+     * 
+     * @return the version, for example 1.31f for JDK 1.3.1
+     * @deprecated Use {@link #JAVA_VERSION_FLOAT} instead.
+     *             Method will be removed in Commons Lang 3.0.
+     */
+    public static float getJavaVersion() {
+        return JAVA_VERSION_FLOAT;
+    }
+
+    /**
+     * <p>Gets the Java version number as a <code>float</code>.</p>
+     *
+     * <p>Example return values:</p>
+     * <ul>
+     *  <li><code>1.2f</code> for JDK 1.2
+     *  <li><code>1.31f</code> for JDK 1.3.1
+     * </ul>
+     * 
+     * <p>Patch releases are not reported.
+     * Zero is returned if {@link #JAVA_VERSION_TRIMMED} is <code>null</code>.</p>
+     * 
+     * @return the version, for example 1.31f for JDK 1.3.1
+     */
+    private static float getJavaVersionAsFloat() {
+        if (JAVA_VERSION_TRIMMED == null) {
+            return 0f;
+        }
+        String str = JAVA_VERSION_TRIMMED.substring(0, 3);
+        if (JAVA_VERSION_TRIMMED.length() >= 5) {
+            str = str + JAVA_VERSION_TRIMMED.substring(4, 5);
+        }
+        return Float.parseFloat(str);
+    }
+    
+    /**
+     * <p>Gets the Java version number as an <code>int</code>.</p>
+     *
+     * <p>Example return values:</p>
+     * <ul>
+     *  <li><code>120</code> for JDK 1.2
+     *  <li><code>131</code> for JDK 1.3.1
+     * </ul>
+     * 
+     * <p>Patch releases are not reported.
+     * Zero is returned if {@link #JAVA_VERSION_TRIMMED} is <code>null</code>.</p>
+     * 
+     * @return the version, for example 131 for JDK 1.3.1
+     */
+    private static int getJavaVersionAsInt() {
+        if (JAVA_VERSION_TRIMMED == null) {
+            return 0;
+        }
+        String str = JAVA_VERSION_TRIMMED.substring(0, 1);
+        str = str + JAVA_VERSION_TRIMMED.substring(2, 3);
+        if (JAVA_VERSION_TRIMMED.length() >= 5) {
+            str = str + JAVA_VERSION_TRIMMED.substring(4, 5);
+        } else {
+            str = str + "0";
+        }
+        return Integer.parseInt(str);
+    }
+
+    /**
+     * Trims the text of the java version to start with numbers.
+     * 
+     * @return the trimmed java version
+     */
+    private static String getJavaVersionTrimmed() {
+        if (JAVA_VERSION != null) {
+            for (int i = 0; i < JAVA_VERSION.length(); i++) {
+                char ch = JAVA_VERSION.charAt(i);
+                if (ch >= '0' && ch <= '9') {
+                    return JAVA_VERSION.substring(i);
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * <p>Decides if the java version matches.</p>
+     * 
+     * @param versionPrefix  the prefix for the java version
+     * @return true if matches, or false if not or can't determine
+     */
+    private static boolean getJavaVersionMatches(String versionPrefix) {
+        if (JAVA_VERSION_TRIMMED == null) {
+            return false;
+        }
+        return JAVA_VERSION_TRIMMED.startsWith(versionPrefix);
+    }    
+    
+    /**
+     * <p>Decides if the operating system matches.</p>
+     * 
+     * @param osNamePrefix  the prefix for the os name
+     * @return true if matches, or false if not or can't determine
+     */
+    private static boolean getOSMatches(String osNamePrefix) {
+        if (OS_NAME == null) {
+            return false;
+        }
+        return OS_NAME.startsWith(osNamePrefix);
+    }    
+
+    /**
+     * <p>Decides if the operating system matches.</p>
+     * 
+     * @param osNamePrefix  the prefix for the os name
+     * @param osVersionPrefix  the prefix for the version
+     * @return true if matches, or false if not or can't determine
+     */
+    private static boolean getOSMatches(String osNamePrefix, String osVersionPrefix) {
+        if (OS_NAME == null || OS_VERSION == null) {
+            return false;
+        }
+        return OS_NAME.startsWith(osNamePrefix) && OS_VERSION.startsWith(osVersionPrefix);
+    }    
+
+    //-----------------------------------------------------------------------
+    /**
+     * <p>Gets a System property, defaulting to <code>null</code> if the property
+     * cannot be read.</p>
+     *
+     * <p>If a <code>SecurityException</code> is caught, the return
+     * value is <code>null</code> and a message is written to <code>System.err</code>.</p>
+     * 
+     * @param property the system property name
+     * @return the system property value or <code>null</code> if a security problem occurs
+     */
+    private static String getSystemProperty(String property) {
+        try {
+            return System.getProperty(property);
+        } catch (SecurityException ex) {
+            // we are not allowed to look at this property
+            System.err.println(
+                "Caught a SecurityException reading the system property '" + property 
+                + "'; the SystemUtils property value will default to null."
+            );
+            return null;
+        }
+    }
+    
+    /**
+     * <p>Is the Java version at least the requested version.</p>
+     *
+     * <p>Example input:</p>
+     * <ul>
+     *  <li><code>1.2f</code> to test for JDK 1.2</li>
+     *  <li><code>1.31f</code> to test for JDK 1.3.1</li>
+     * </ul>
+     * 
+     * @param requiredVersion  the required version, for example 1.31f
+     * @return <code>true</code> if the actual version is equal or greater
+     *  than the required version
+     */
+    public static boolean isJavaVersionAtLeast(float requiredVersion) {
+        return JAVA_VERSION_FLOAT >= requiredVersion;
+    }
+    
+    /**
+     * <p>Is the Java version at least the requested version.</p>
+     *
+     * <p>Example input:</p>
+     * <ul>
+     *  <li><code>120</code> to test for JDK 1.2 or greater</li>
+     *  <li><code>131</code> to test for JDK 1.3.1 or greater</li>
+     * </ul>
+     * 
+     * @param requiredVersion  the required version, for example 131
+     * @return <code>true</code> if the actual version is equal or greater
+     *  than the required version
+     * @since 2.0
+     */
+    public static boolean isJavaVersionAtLeast(int requiredVersion) {
+        return JAVA_VERSION_INT >= requiredVersion;
+    }
+
+    /**
+     * Returns whether the {@link #JAVA_AWT_HEADLESS} value is <code>true</code>.
+     *  
+     * @return <code>true</code> if <code>JAVA_AWT_HEADLESS</code> is <code>"true"</code>,
+     * <code>false</code> otherwise.
+     * 
+     * @see #JAVA_AWT_HEADLESS
+     * @since 2.1
+     * @since Java 1.4
+     */
+    public static boolean isJavaAwtHeadless() {
+        return JAVA_AWT_HEADLESS != null ? JAVA_AWT_HEADLESS.equals(Boolean.TRUE.toString()) : false;
+    }
+    /**
+     * <p>Gets the Java home directory as a <code>File</code>.</p>
+     * 
+     * @return a directory
+     * @throws  SecurityException  if a security manager exists and its  
+     *             <code>checkPropertyAccess</code> method doesn't allow
+     *              access to the specified system property.
+     * @see System#getProperty(String)
+     * @since 2.1
+     */
+    public static File getJavaHome() {
+        return new File(System.getProperty(JAVA_HOME_KEY));
+    }
+
+    /**
+     * <p>Gets the Java IO temporary directory as a <code>File</code>.</p>
+     * 
+     * @return a directory
+     * @throws  SecurityException  if a security manager exists and its  
+     *             <code>checkPropertyAccess</code> method doesn't allow
+     *              access to the specified system property.
+     * @see System#getProperty(String)
+     * @since 2.1
+     */
+    public static File getJavaIoTmpDir() {
+        return new File(System.getProperty(JAVA_IO_TMPDIR_KEY));
+    }
+
+    /**
+     * <p>Gets the user directory as a <code>File</code>.</p>
+     * 
+     * @return a directory
+     * @throws  SecurityException  if a security manager exists and its  
+     *             <code>checkPropertyAccess</code> method doesn't allow
+     *              access to the specified system property.
+     * @see System#getProperty(String)
+     * @since 2.1
+     */
+    public static File getUserDir() {
+        return new File(System.getProperty(USER_DIR_KEY));
+    }
+
+    /**
+     * <p>Gets the user home directory as a <code>File</code>.</p>
+     * 
+     * @return a directory
+     * @throws  SecurityException  if a security manager exists and its  
+     *             <code>checkPropertyAccess</code> method doesn't allow
+     *              access to the specified system property.
+     * @see System#getProperty(String)
+     * @since 2.1
+     */
+    public static File getUserHome() {
+        return new File(System.getProperty(USER_HOME_KEY));
+    }
+
+}

Propchange: directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/SystemUtils.java
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    svn:keywords = HeadURL Id LastChangedBy LastChangedDate LastChangedRevision

Added: directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/UnhandledException.java
URL: http://svn.apache.org/viewcvs/directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/UnhandledException.java?rev=370807&view=auto
==============================================================================
--- directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/UnhandledException.java (added)
+++ directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/UnhandledException.java Fri Jan 20 05:47:50 2006
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2002-2005 The Apache Software Foundation.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.mina.common.support.lang;
+
+import org.apache.mina.common.support.lang.exception.NestableRuntimeException;
+
+/**
+ * <p>Thrown when it is impossible or undesirable to consume or throw a checked exception.</p>
+ * This exception supplements the standard exception classes by providing a more
+ * semantically rich description of the problem.</p>
+ * 
+ * <p><code>UnhandledException</code> represents the case where a method has to deal
+ * with a checked exception but does not wish to.
+ * Instead, the checked exception is rethrown in this unchecked wrapper.</p>
+ * 
+ * <pre>
+ * public void foo() {
+ *   try {
+ *     // do something that throws IOException
+ *   } catch (IOException ex) {
+ *     // don't want to or can't throw IOException from foo()
+ *     throw new UnhandledException(ex);
+ *   }
+ * }
+ * </pre>
+ *
+ * @author Matthew Hawthorne
+ * @since 2.0
+ * @version $Id$
+ */
+public class UnhandledException extends NestableRuntimeException {
+
+    /**
+     * Constructs the exception using a cause.
+     *
+     * @param cause  the underlying cause
+     */
+    public UnhandledException(Throwable cause) {
+        super(cause);
+    }
+
+    /**
+     * Constructs the exception using a message and cause.
+     *
+     * @param message  the message to use
+     * @param cause  the underlying cause
+     */
+    public UnhandledException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+}

Propchange: directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/UnhandledException.java
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    svn:keywords = HeadURL Id LastChangedBy LastChangedDate LastChangedRevision

Added: directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/Validate.java
URL: http://svn.apache.org/viewcvs/directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/Validate.java?rev=370807&view=auto
==============================================================================
--- directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/Validate.java (added)
+++ directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/Validate.java Fri Jan 20 05:47:50 2006
@@ -0,0 +1,552 @@
+/*
+ * Copyright 2002-2005 The Apache Software Foundation.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.mina.common.support.lang;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Map;
+
+/**
+ * <p>Assists in validating arguments.</p>
+ * 
+ * <p>The class is based along the lines of JUnit. If an argument value is 
+ * deemed invalid, an IllegalArgumentException is thrown. For example:</p>
+ * 
+ * <pre>
+ * Validate.isTrue( i > 0, "The value must be greater than zero: ", i);
+ * Validate.notNull( surname, "The surname must not be null");
+ * </pre>
+ *
+ * @author <a href="mailto:ola.berg@arkitema.se">Ola Berg</a>
+ * @author Stephen Colebourne
+ * @author Gary Gregory
+ * @author Norm Deane
+ * @since 2.0
+ * @version $Id$
+ */
+public class Validate {
+    // Validate has no dependencies on other classes in Commons Lang at present
+    
+    /**
+     * Constructor. This class should not normally be instantiated.
+     */
+    public Validate() {
+    }
+    
+    // isTrue
+    //---------------------------------------------------------------------------------
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the test result is <code>false</code>.</p>
+     * 
+     * <p>This is used when validating according to an arbitrary boolean expression,
+     * such as validating a primitive number or using your own custom validation 
+     * expression.</p>
+     *
+     * <pre>
+     * Validate.isTrue( myObject.isOk(), "The object is not OK: ", myObject);
+     * </pre>
+     *
+     * <p>For performance reasons, the object is passed as a separate parameter and
+     * appended to the message string only in the case of an error.</p>
+     * 
+     * @param expression  a boolean expression
+     * @param message  the exception message you would like to see if the
+     *  expression is <code>false</code>
+     * @param value  the value to append to the message in case of error
+     * @throws IllegalArgumentException if expression is <code>false</code>
+     */
+    public static void isTrue(boolean expression, String message, Object value) {
+        if (expression == false) {
+            throw new IllegalArgumentException(message + value);
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the test result is <code>false</code>.</p>
+     * 
+     * <p>This is used when validating according to an arbitrary boolean expression,
+     * such as validating a primitive number or using your own custom validation 
+     * expression.</p>
+     *
+     * <pre>
+     * Validate.isTrue( i > 0, "The value must be greater than zero: ", i);
+     * </pre>
+     *
+     * <p>For performance reasons, the long value is passed as a separate parameter and
+     * appended to the message string only in the case of an error.</p>
+     * 
+     * @param expression  a boolean expression
+     * @param message  the exception message you would like to see if the expression is <code>false</code>
+     * @param value  the value to append to the message in case of error
+     * @throws IllegalArgumentException if expression is <code>false</code>
+     */
+    public static void isTrue(boolean expression, String message, long value) {
+        if (expression == false) {
+            throw new IllegalArgumentException(message + value);
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the test result is <code>false</code>.</p>
+     * 
+     * <p>This is used when validating according to an arbitrary boolean expression,
+     * such as validating a primitive number or using your own custom validation 
+     * expression.</p>
+     *
+     * <pre>
+     * Validate.isTrue( d > 0.0, "The value must be greater than zero: ", d);
+     * </pre>
+     *
+     * <p>For performance reasons, the double value is passed as a separate parameter and
+     * appended to the message string only in the case of an error.</p>
+     * 
+     * @param expression  a boolean expression
+     * @param message  the exception message you would like to see if the expression
+     *  is <code>false</code>
+     * @param value  the value to append to the message in case of error
+     * @throws IllegalArgumentException if expression is <code>false</code>
+     */
+    public static void isTrue(boolean expression, String message, double value) {
+        if (expression == false) {
+            throw new IllegalArgumentException(message + value);
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the test result is <code>false</code>.</p>
+     * 
+     * <p>This is used when validating according to an arbitrary boolean expression,
+     * such as validating a primitive number or using your own custom validation 
+     * expression.</p>
+     *
+     * <pre>
+     * Validate.isTrue( (i > 0), "The value must be greater than zero");
+     * Validate.isTrue( myObject.isOk(), "The object is not OK");
+     * </pre>
+     *
+     * <p>For performance reasons, the message string should not involve a string append,
+     * instead use the {@link #isTrue(boolean, String, Object)} method.</p>
+     * 
+     * @param expression  a boolean expression
+     * @param message  the exception message you would like to see if the expression
+     *  is <code>false</code>
+     * @throws IllegalArgumentException if expression is <code>false</code>
+     */
+    public static void isTrue(boolean expression, String message) {
+        if (expression == false) {
+            throw new IllegalArgumentException(message);
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the test result is <code>false</code>.</p>
+     * 
+     * <p>This is used when validating according to an arbitrary boolean expression,
+     * such as validating a primitive number or using your own custom validation 
+     * expression.</p>
+     *
+     * <pre>
+     * Validate.isTrue( i > 0 );
+     * Validate.isTrue( myObject.isOk() );
+     * </pre>
+     *
+     * <p>The message in the exception is 'The validated expression is false'.</p>
+     * 
+     * @param expression  a boolean expression
+     * @throws IllegalArgumentException if expression is <code>false</code>
+     */
+    public static void isTrue(boolean expression) {
+        if (expression == false) {
+            throw new IllegalArgumentException("The validated expression is false");
+        }
+    }
+
+    // notNull
+    //---------------------------------------------------------------------------------
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument is <code>null</code>.</p>
+     *
+     * <pre>
+     * Validate.notNull(myObject, "The object must not be null");
+     * </pre>
+     * 
+     * @param object  the object to check is not <code>null</code>
+     * @param message  the exception message you would like to see
+     *  if the object is <code>null</code>
+     * @throws IllegalArgumentException if the object is <code>null</code>
+     */
+    public static void notNull(Object object, String message) {
+        if (object == null) {
+            throw new IllegalArgumentException(message);
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument is <code>null</code>.</p>
+     *
+     * <pre>
+     * Validate.notNull(myObject);
+     * </pre>
+     *
+     * <p>The message in the exception is 'The validated object is null'.</p>
+     * 
+     * @param object  the object to check is not <code>null</code>
+     * @throws IllegalArgumentException if the object is <code>null</code>
+     */
+    public static void notNull(Object object) {
+        if (object == null) {
+            throw new IllegalArgumentException("The validated object is null");
+        }
+    }
+
+    // notEmpty array
+    //---------------------------------------------------------------------------------
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument array is empty (<code>null</code> or no elements).</p>
+     *
+     * <pre>
+     * Validate.notEmpty(myArray, "The array must not be empty");
+     * </pre>
+     * 
+     * @param array  the array to check is not empty
+     * @param message  the exception message you would like to see if the array is empty
+     * @throws IllegalArgumentException if the array is empty
+     */
+    public static void notEmpty(Object[] array, String message) {
+        if (array == null || array.length == 0) {
+            throw new IllegalArgumentException(message);
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument array is empty (<code>null</code> or no elements).</p>
+     *
+     * <pre>
+     * Validate.notEmpty(myArray);
+     * </pre>
+     *
+     * <p>The message in the exception is 'The validated array is empty'.
+     * 
+     * @param array  the array to check is not empty
+     * @throws IllegalArgumentException if the array is empty
+     */
+    public static void notEmpty(Object[] array) {
+        if (array == null || array.length == 0) {
+            throw new IllegalArgumentException("The validated array is empty");
+        }
+    }
+
+    // notEmpty collection
+    //---------------------------------------------------------------------------------
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument Collection is empty (<code>null</code> or no elements).</p>
+     *
+     * <pre>
+     * Validate.notEmpty(myCollection, "The collection must not be empty");
+     * </pre>
+     * 
+     * @param collection  the collection to check is not empty
+     * @param message  the exception message you would like to see if the collection is empty
+     * @throws IllegalArgumentException if the collection is empty
+     */
+    public static void notEmpty(Collection collection, String message) {
+        if (collection == null || collection.size() == 0) {
+            throw new IllegalArgumentException(message);
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument Collection is empty (<code>null</code> or no elements).</p>
+     *
+     * <pre>
+     * Validate.notEmpty(myCollection);
+     * </pre>
+     *
+     * <p>The message in the exception is 'The validated collection is empty'.</p>
+     * 
+     * @param collection  the collection to check is not empty
+     * @throws IllegalArgumentException if the collection is empty
+     */
+    public static void notEmpty(Collection collection) {
+        if (collection == null || collection.size() == 0) {
+            throw new IllegalArgumentException("The validated collection is empty");
+        }
+    }
+
+    // notEmpty map
+    //---------------------------------------------------------------------------------
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument Map is empty (<code>null</code> or no elements).</p>
+     *
+     * <pre>
+     * Validate.notEmpty(myMap, "The map must not be empty");
+     * </pre>
+     * 
+     * @param map  the map to check is not empty
+     * @param message  the exception message you would like to see if the map is empty
+     * @throws IllegalArgumentException if the map is empty
+     */
+    public static void notEmpty(Map map, String message) {
+        if (map == null || map.size() == 0) {
+            throw new IllegalArgumentException(message);
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument Map is empty (<code>null</code> or no elements).</p>
+     *
+     * <pre>
+     * Validate.notEmpty(myMap);
+     * </pre>
+     *
+     * <p>The message in the exception is 'The validated map is empty'.</p>
+     * 
+     * @param map  the map to check is not empty
+     * @throws IllegalArgumentException if the map is empty
+     */
+    public static void notEmpty(Map map) {
+        if (map == null || map.size() == 0) {
+            throw new IllegalArgumentException("The validated map is empty");
+        }
+    }
+
+    // notEmpty string
+    //---------------------------------------------------------------------------------
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument String is empty (<code>null</code> or zero length).</p>
+     *
+     * <pre>
+     * Validate.notEmpty(myString, "The string must not be empty");
+     * </pre>
+     * 
+     * @param string  the string to check is not empty
+     * @param message  the exception message you would like to see if the string is empty
+     * @throws IllegalArgumentException if the string is empty
+     */
+    public static void notEmpty(String string, String message) {
+        if (string == null || string.length() == 0) {
+            throw new IllegalArgumentException(message);
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument String is empty (<code>null</code> or zero length).</p>
+     *
+     * <pre>
+     * Validate.notEmpty(myString);
+     * </pre>
+     *
+     * <p>The message in the exception is 'The validated string is empty'.</p>
+     * 
+     * @param string  the string to check is not empty
+     * @throws IllegalArgumentException if the string is empty
+     */
+    public static void notEmpty(String string) {
+        if (string == null || string.length() == 0) {
+            throw new IllegalArgumentException("The validated string is empty");
+        }
+    }
+
+    // notNullElements array
+    //---------------------------------------------------------------------------------
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument array has <code>null</code> elements or is
+     * <code>null</code>.</p>
+     *
+     * <pre>
+     * Validate.noNullElements(myArray, "The array must not contain null elements");
+     * </pre>
+     * 
+     * <p>If the array is null then the message in the exception is 'The validated object is null'.</p>
+     *
+     * @param array  the array to check
+     * @param message  the exception message if the array has
+     *  <code>null</code> elements
+     * @throws IllegalArgumentException if the array has <code>null</code>
+     *  elements or is <code>null</code>
+     */
+    public static void noNullElements(Object[] array, String message) {
+        Validate.notNull(array);
+        for (int i = 0; i < array.length; i++) {
+            if (array[i] == null) {
+                throw new IllegalArgumentException(message);
+            }
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument array has <code>null</code> elements or is
+     * <code>null</code>.</p>
+     *
+     * <pre>
+     * Validate.noNullElements(myArray);
+     * </pre>
+     *
+     * <p>If the array has a null element the message in the exception is
+     * 'The validated array contains null element at index: '.</p>
+     *
+     * <p>If the array is null then the message in the exception is 'The validated object is null'.</p>
+     * 
+     * @param array  the array to check
+     * @throws IllegalArgumentException if the array has <code>null</code>
+     *  elements or is <code>null</code>
+     */
+    public static void noNullElements(Object[] array) {
+        Validate.notNull(array);
+        for (int i = 0; i < array.length; i++) {
+            if (array[i] == null) {
+                throw new IllegalArgumentException("The validated array contains null element at index: " + i);
+            }
+        }
+    }
+
+    // notNullElements collection
+    //---------------------------------------------------------------------------------
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument Collection has <code>null</code> elements or is
+     * <code>null</code>.</p>
+     *
+     * <pre>
+     * Validate.noNullElements(myCollection, "The collection must not contain null elements");
+     * </pre>
+     *
+     * <p>If the collection is null then the message in the exception is 'The validated object is null'.</p>
+     * 
+     * @param collection  the collection to check
+     * @param message  the exception message if the collection has
+     *  <code>null</code> elements
+     * @throws IllegalArgumentException if the collection has
+     *  <code>null</code> elements or is <code>null</code>
+     */
+    public static void noNullElements(Collection collection, String message) {
+        Validate.notNull(collection);
+        for (Iterator it = collection.iterator(); it.hasNext();) {
+            if (it.next() == null) {
+                throw new IllegalArgumentException(message);
+            }
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument Collection has <code>null</code> elements or is
+     * <code>null</code>.</p>
+     *
+     * <pre>
+     * Validate.noNullElements(myCollection);
+     * </pre>
+     *
+     * <p>The message in the exception is 'The validated collection contains null element at index: '.</p>
+     *
+     * <p>If the collection is null then the message in the exception is 'The validated object is null'.</p>
+     * 
+     * @param collection  the collection to check
+     * @throws IllegalArgumentException if the collection has
+     *  <code>null</code> elements or is <code>null</code>
+     */
+    public static void noNullElements(Collection collection) {
+        Validate.notNull(collection);
+        int i = 0;
+        for (Iterator it = collection.iterator(); it.hasNext(); i++) {
+            if (it.next() == null) {
+                throw new IllegalArgumentException("The validated collection contains null element at index: " + i);
+            }
+        }
+    }
+
+    /**
+     * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
+     * if the argument collection  is <code>null</code> or has elements that
+     * are not of type <code>clazz</code> or a subclass.</p>
+     *
+     * <pre>
+     * Validate.allElementsOfType(collection, String.class, "Collection has invalid elements");
+     * </pre>
+     *
+     * @param collection  the collection to check, not null
+     * @param clazz  the <code>Class</code> which the collection's elements are expected to be, not null
+     * @param message  the exception message if the <code>Collection</code> has elements not of type <code>clazz</code>
+     * @since 2.1
+     */
+    public static void allElementsOfType(Collection collection, Class clazz, String message) {
+        Validate.notNull(collection);
+        Validate.notNull(clazz);
+        for (Iterator it = collection.iterator(); it.hasNext(); ) {
+            if (clazz.isInstance(it.next()) == false) {
+                throw new IllegalArgumentException(message);
+            }
+        }
+    }
+
+    /**
+     * <p>
+     * Validate an argument, throwing <code>IllegalArgumentException</code> if the argument collection is
+     * <code>null</code> or has elements that are not of type <code>clazz</code> or a subclass.
+     * </p>
+     * 
+     * <pre>
+     * Validate.allElementsOfType(collection, String.class);
+     * </pre>
+     * 
+     * <p>
+     * The message in the exception is 'The validated collection contains an element not of type clazz at index: '.
+     * </p>
+     * 
+     * @param collection
+     *            the collection to check, not null
+     * @param clazz
+     *            the <code>Class</code> which the collection's elements are expected to be, not null
+     * @since 2.1
+     */
+    public static void allElementsOfType(Collection collection, Class clazz) {
+        Validate.notNull(collection);
+        Validate.notNull(clazz);
+        int i = 0;
+        for (Iterator it = collection.iterator(); it.hasNext(); i++) {
+            if (clazz.isInstance(it.next()) == false) {
+                throw new IllegalArgumentException("The validated collection contains an element not of type "
+                    + clazz.getName() + " at index: " + i);
+            }
+        }
+    }
+
+}

Propchange: directory/sandbox/trustin/mina-spi/core/src/main/java/org/apache/mina/common/support/lang/Validate.java
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