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/**
* Copyright (c) 2004 - 2011 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.internal.net4j.buffer;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
/**
* @author Eike Stepper
*/
public final class BufferUtil
{
private static final byte FALSE = (byte)0;
private static final byte TRUE = (byte)1;
public static final String UTF8_CHAR_SET_NAME = "UTF-8"; //$NON-NLS-1$
private BufferUtil()
{
}
public static byte[] toUTF8(String str)
{
if (str == null)
{
return new byte[0];
}
try
{
byte[] bytes = str.getBytes(UTF8_CHAR_SET_NAME);
String test = new String(bytes, UTF8_CHAR_SET_NAME);
if (!str.equals(test))
{
throw new IllegalArgumentException("String not encodable: " + str); //$NON-NLS-1$
}
return bytes;
}
catch (UnsupportedEncodingException ex)
{
// This should really not happen
throw new RuntimeException(ex);
}
}
public static String fromUTF8(byte[] bytes)
{
try
{
return new String(bytes, UTF8_CHAR_SET_NAME);
}
catch (UnsupportedEncodingException ex)
{
// This should really not happen
throw new RuntimeException(ex);
}
}
public static void putObject(ByteBuffer byteBuffer, Object object) throws IOException
{
if (object != null)
{
byteBuffer.put(TRUE);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream stream = new ObjectOutputStream(baos);
stream.writeObject(object);
byte[] array = baos.toByteArray();
putByteArray(byteBuffer, array);
}
else
{
byteBuffer.put(FALSE);
}
}
public static Object getObject(ByteBuffer byteBuffer) throws IOException, ClassNotFoundException
{
boolean nonNull = byteBuffer.get() == TRUE;
if (nonNull)
{
byte[] array = getByteArray(byteBuffer);
ByteArrayInputStream bais = new ByteArrayInputStream(array);
ObjectInputStream stream = new ObjectInputStream(bais);
return stream.readObject();
}
return null;
}
public static void putByteArray(ByteBuffer byteBuffer, byte[] array)
{
byteBuffer.putShort((short)array.length);
if (array.length != 0)
{
byteBuffer.put(array);
}
}
public static byte[] getByteArray(ByteBuffer byteBuffer)
{
short length = byteBuffer.getShort();
byte[] array = new byte[length];
if (length != 0)
{
byteBuffer.get(array);
}
return array;
}
public static void putUTF8(ByteBuffer byteBuffer, String str)
{
byte[] bytes = BufferUtil.toUTF8(str);
if (bytes.length > byteBuffer.remaining())
{
throw new IllegalArgumentException("String too long: " + str); //$NON-NLS-1$
}
putByteArray(byteBuffer, bytes);
}
}
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