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From ohe...@apache.org
Subject svn commit: r1425769 - in /commons/proper/configuration/trunk/src: main/java/org/apache/commons/configuration/interpol/SystemPropertiesLookup.java test/java/org/apache/commons/configuration/interpol/TestSystemPropertiesLookup.java
Date Tue, 25 Dec 2012 20:13:54 GMT
Author: oheger
Date: Tue Dec 25 20:13:54 2012
New Revision: 1425769

URL: http://svn.apache.org/viewvc?rev=1425769&view=rev
Log:
[CONFIGURATION-518] Added SystemPropertiesLookup class.

Added:
    commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/interpol/SystemPropertiesLookup.java
  (with props)
    commons/proper/configuration/trunk/src/test/java/org/apache/commons/configuration/interpol/TestSystemPropertiesLookup.java
  (with props)

Added: commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/interpol/SystemPropertiesLookup.java
URL: http://svn.apache.org/viewvc/commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/interpol/SystemPropertiesLookup.java?rev=1425769&view=auto
==============================================================================
--- commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/interpol/SystemPropertiesLookup.java
(added)
+++ commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/interpol/SystemPropertiesLookup.java
Tue Dec 25 20:13:54 2012
@@ -0,0 +1,55 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.commons.configuration.interpol;
+
+import org.apache.commons.lang3.text.StrLookup;
+
+/**
+ * <p>
+ * A specialized implementation of the {@code Lookup} interface that allows
+ * access to system properties.
+ * </p>
+ * <p>
+ * This implementation relies on {@code StrLookup.systemPropertiesLookup()} from
+ * the Commons Lang project to resolve system properties. It can be used for
+ * referencing system properties in configuration files in an easy way, for
+ * instance:
+ *
+ * <pre>
+ * current.user = ${sys:user.name}
+ * </pre>
+ *
+ * </p>
+ * <p>
+ * {@code SystemPropertiesLookup} is one of the standard lookups that is
+ * registered per default for each configuration.
+ * </p>
+ *
+ * @version $Id$
+ * @since 2.0
+ */
+public class SystemPropertiesLookup implements Lookup
+{
+    /** The underlying StrLookup object. */
+    private final StrLookup<String> sysLookup = StrLookup
+            .systemPropertiesLookup();
+
+    public Object lookup(String variable)
+    {
+        return sysLookup.lookup(variable);
+    }
+}

Propchange: commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/interpol/SystemPropertiesLookup.java
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Propchange: commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/interpol/SystemPropertiesLookup.java
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Added: commons/proper/configuration/trunk/src/test/java/org/apache/commons/configuration/interpol/TestSystemPropertiesLookup.java
URL: http://svn.apache.org/viewvc/commons/proper/configuration/trunk/src/test/java/org/apache/commons/configuration/interpol/TestSystemPropertiesLookup.java?rev=1425769&view=auto
==============================================================================
--- commons/proper/configuration/trunk/src/test/java/org/apache/commons/configuration/interpol/TestSystemPropertiesLookup.java
(added)
+++ commons/proper/configuration/trunk/src/test/java/org/apache/commons/configuration/interpol/TestSystemPropertiesLookup.java
Tue Dec 25 20:13:54 2012
@@ -0,0 +1,63 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.commons.configuration.interpol;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import java.util.Map;
+
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Test class for {@code SystemPropertiesLookup}.
+ *
+ * @version $Id$
+ */
+public class TestSystemPropertiesLookup
+{
+    /** The lookup object to be tested.*/
+    private SystemPropertiesLookup lookup;
+
+    @Before
+    public void setUp() throws Exception
+    {
+        lookup = new SystemPropertiesLookup();
+    }
+
+    /**
+     * Tests whether system properties can be looked up.
+     */
+    @Test
+    public void testLookupProperties()
+    {
+        for(Map.Entry<Object, Object> e : System.getProperties().entrySet())
+        {
+            assertEquals("Wrong property value for " + e.getKey(), e.getValue(), lookup.lookup(String.valueOf(e.getKey())));
+        }
+    }
+
+    /**
+     * Tests whether an unknown property is handled correctly.
+     */
+    @Test
+    public void testLookupUnknownProperty()
+    {
+        assertNull("Got a value", lookup.lookup("a non existing system property!"));
+    }
+}

Propchange: commons/proper/configuration/trunk/src/test/java/org/apache/commons/configuration/interpol/TestSystemPropertiesLookup.java
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