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From arm...@apache.org
Subject svn commit: r398727 - /db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java
Date Mon, 01 May 2006 23:12:22 GMT
Author: arminw
Date: Mon May  1 16:12:20 2006
New Revision: 398727

URL: http://svn.apache.org/viewcvs?rev=398727&view=rev
Log:
helper class for LOB support

Added:
    db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java

Added: db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java
URL: http://svn.apache.org/viewcvs/db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java?rev=398727&view=auto
==============================================================================
--- db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java
(added)
+++ db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java
Mon May  1 16:12:20 2006
@@ -0,0 +1,234 @@
+package org.apache.ojb.broker.util;
+
+/* Copyright 2002-2006 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.
+ */
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+
+/**
+ * This class is a copy of {@link org.apache.tools.ant.util.ReaderInputStream}.
+ *
+ * @version $Id: $
+ */
+public class ReaderInputStream extends InputStream
+{
+
+    /** Source Reader */
+    private Reader in;
+
+    private String encoding = System.getProperty("file.encoding");
+
+    private byte[] slack;
+
+    private int begin;
+
+    /**
+     * Construct a <CODE>ReaderInputStream</CODE>
+     * for the specified <CODE>Reader</CODE>.
+     *
+     * @param reader <CODE>Reader</CODE>.  Must not be <code>null</code>.
+     */
+    public ReaderInputStream(Reader reader)
+    {
+        in = reader;
+    }
+
+    /**
+     * Construct a <CODE>ReaderInputStream</CODE>
+     * for the specified <CODE>Reader</CODE>,
+     * with the specified encoding.
+     *
+     * @param reader non-null <CODE>Reader</CODE>.
+     * @param encoding non-null <CODE>String</CODE> encoding.
+     */
+    public ReaderInputStream(Reader reader, String encoding)
+    {
+        this(reader);
+        if(encoding == null)
+        {
+            throw new IllegalArgumentException("encoding must not be null");
+        }
+        else
+        {
+            this.encoding = encoding;
+        }
+    }
+
+    /**
+     * Reads from the <CODE>Reader</CODE>, returning the same value.
+     *
+     * @return the value of the next character in the <CODE>Reader</CODE>.
+     * @throws IOException if the original <code>Reader</code> fails to be read
+     */
+    public synchronized int read() throws IOException
+    {
+        if(in == null)
+        {
+            throw new IOException("Stream Closed");
+        }
+
+        byte result;
+        if(slack != null && begin < slack.length)
+        {
+            result = slack[begin];
+            if(++begin == slack.length)
+            {
+                slack = null;
+            }
+        }
+        else
+        {
+            byte[] buf = new byte[1];
+            if(read(buf, 0, 1) <= 0)
+            {
+                result = -1;
+            }
+            result = buf[0];
+        }
+
+        if(result < -1)
+        {
+            result += 256;
+        }
+
+        return result;
+    }
+
+    /**
+     * Reads from the <code>Reader</code> into a byte array
+     *
+     * @param b the byte array to read into
+     * @param off the offset in the byte array
+     * @param len the length in the byte array to fill
+     * @return the actual number read into the byte array, -1 at
+     *         the end of the stream
+     * @throws IOException if an error occurs
+     */
+    public synchronized int read(byte[] b, int off, int len)
+            throws IOException
+    {
+        if(in == null)
+        {
+            throw new IOException("Stream Closed");
+        }
+
+        while(slack == null)
+        {
+            char[] buf = new char[len]; // might read too much
+            int n = in.read(buf);
+            if(n == -1)
+            {
+                return -1;
+            }
+            if(n > 0)
+            {
+                slack = new String(buf, 0, n).getBytes(encoding);
+                begin = 0;
+            }
+        }
+
+        if(len > slack.length - begin)
+        {
+            len = slack.length - begin;
+        }
+
+        System.arraycopy(slack, begin, b, off, len);
+
+        if((begin += len) >= slack.length)
+        {
+            slack = null;
+        }
+
+        return len;
+    }
+
+    /**
+     * Marks the read limit of the StringReader.
+     *
+     * @param limit the maximum limit of bytes that can be read before the
+     * mark position becomes invalid
+     */
+    public synchronized void mark(final int limit)
+    {
+        try
+        {
+            in.mark(limit);
+        }
+        catch(IOException ioe)
+        {
+            throw new RuntimeException(ioe.getMessage());
+        }
+    }
+
+
+    /**
+     * @return the current number of bytes ready for reading
+     * @throws IOException if an error occurs
+     */
+    public synchronized int available() throws IOException
+    {
+        if(in == null)
+        {
+            throw new IOException("Stream Closed");
+        }
+        if(slack != null)
+        {
+            return slack.length - begin;
+        }
+        if(in.ready())
+        {
+            return 1;
+        }
+        else
+        {
+            return 0;
+        }
+    }
+
+    /** @return false - mark is not supported */
+    public boolean markSupported()
+    {
+        return false;   // would be imprecise
+    }
+
+    /**
+     * Resets the StringReader.
+     *
+     * @throws IOException if the StringReader fails to be reset
+     */
+    public synchronized void reset() throws IOException
+    {
+        if(in == null)
+        {
+            throw new IOException("Stream Closed");
+        }
+        slack = null;
+        in.reset();
+    }
+
+    /**
+     * Closes the Stringreader.
+     *
+     * @throws IOException if the original StringReader fails to be closed
+     */
+    public synchronized void close() throws IOException
+    {
+        in.close();
+        slack = null;
+        in = null;
+    }
+}



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