svn commit: r520089 - /jakarta/commons/proper/vfs/trunk/sandbox/src/main/java/org/apache/commons/vfs/RACRandomAccessFile.java

[im...@apache.org]

Author: imario
Date: Mon Mar 19 13:28:23 2007
New Revision: 520089

URL: http://svn.apache.org/viewvc?view=rev&rev=520089
Log:
VFS-90: wrapper to make a RandomAccessContent look like a java.io.RandomAccessFile

Added:
    jakarta/commons/proper/vfs/trunk/sandbox/src/main/java/org/apache/commons/vfs/RACRandomAccessFile.java

Added: jakarta/commons/proper/vfs/trunk/sandbox/src/main/java/org/apache/commons/vfs/RACRandomAccessFile.java
URL: http://svn.apache.org/viewvc/jakarta/commons/proper/vfs/trunk/sandbox/src/main/java/org/apache/commons/vfs/RACRandomAccessFile.java?view=auto&rev=520089
==============================================================================
--- jakarta/commons/proper/vfs/trunk/sandbox/src/main/java/org/apache/commons/vfs/RACRandomAccessFile.java (added)
+++ jakarta/commons/proper/vfs/trunk/sandbox/src/main/java/org/apache/commons/vfs/RACRandomAccessFile.java Mon Mar 19 13:28:23 2007
@@ -0,0 +1,157 @@
+/*
+ * 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.commons.vfs;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.RandomAccessFile;
+
+/**
+ * Encapsulates a {@link RandomAccessContent} instance, allowing it to be used
+ * as a {@link RandomAccessFile} instance.
+ *
+ * @author Elifarley Callado Coelho Cruz <el...@gmail.com>
+ * @version 1.1, $LastChangedRevision: 1163 $, $LastChangedDate: 2006-12-13 03:18:57 +0000 (Qua, 13 Dez 2006) $
+ */
+public class RACRandomAccessFile extends RandomAccessFile implements RandomAccessContent
+{
+	private RandomAccessContent rac;
+	protected final byte[] singleByteBuf = new byte[1];
+
+	private static File createTempFile() throws IOException
+	{
+		return File.createTempFile("fraf", "");
+	}
+
+	private void deleteTempFile(File tempFile)
+	{
+		try
+		{
+			super.close();
+		}
+		catch (IOException ex)
+		{
+			throw new RuntimeException(ex);
+		}
+		finally
+		{
+			tempFile.delete();
+		}
+	}
+
+	public RACRandomAccessFile(RandomAccessContent rac) throws IOException
+	{
+		this(createTempFile());
+		this.rac = rac;
+	}
+
+	private RACRandomAccessFile(File tempFile) throws IOException
+	{
+		super(tempFile, "r");
+		deleteTempFile(tempFile);
+	}
+
+	public long getFilePointer() throws IOException
+	{
+		return this.rac.getFilePointer();
+	}
+
+	public void seek(long pos) throws IOException
+	{
+		this.rac.seek(pos);
+	}
+
+	public int skipBytes(int n) throws IOException
+	{
+		return this.rac.skipBytes(n);
+	}
+
+	public long length() throws IOException
+	{
+		return this.rac.length();
+	}
+
+	/* (non-Javadoc)
+		 * @see org.ecc.base.io.FilterRandomAccessFile#setLength(long)
+		 */
+	public void setLength(long newLength) throws IOException
+	{
+		throw new IOException("Underlying RandomAccessContent instance length cannot be modified.");
+	}
+
+	public InputStream getInputStream() throws IOException
+	{
+		return this.rac.getInputStream();
+	}
+
+	public void close() throws IOException
+	{
+		this.rac.close();
+	}
+
+
+	/**
+	 * @see java.io.RandomAccessFile#read(byte[])
+	 */
+	public final int read(byte[] b) throws IOException
+	{
+		return read(b, 0, b.length);
+	}
+
+	/**
+	 * @see java.io.RandomAccessFile#read()
+	 */
+	public final int read() throws IOException
+	{
+		final byte[] buf = this.singleByteBuf;
+		int count = read(buf, 0, 1);
+		return count < 0 ? -1 : (buf[0] & 0xFF);
+	}
+
+	public int read(byte[] b, int off, int len) throws IOException
+	{
+		this.rac.readFully(b, off, len);
+		return len;
+	}
+
+	/**
+	 * @see java.io.RandomAccessFile#write(int)
+	 */
+	public final void write(int b) throws IOException
+	{
+		final byte[] buf = this.singleByteBuf;
+		buf[0] = (byte) b;
+		write(buf, 0, 1);
+	}
+
+	/**
+	 * @see java.io.RandomAccessFile#write(byte[])
+	 */
+	public final void write(byte[] b) throws IOException
+	{
+		write(b, 0, b.length);
+	}
+
+	/**
+	 * @see java.io.RandomAccessFile#write(byte[],int,int)
+	 */
+	public void write(byte[] b, int off, int len) throws IOException
+	{
+		this.rac.write(b, off, len);
+	}
+
+}



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