/*
* 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.directory.mavibot.btree.serializer;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Comparator;
import org.apache.directory.mavibot.btree.comparator.ByteArrayComparator;
/**
* A serializer for a byte[].
*
* @author <a href="mailto:labs@labs.apache.org">Mavibot labs Project</a>
*/
public class ByteArraySerializer extends AbstractElementSerializer<byte[]>
{
/**
* Create a new instance of ByteArraySerializer
*/
public ByteArraySerializer()
{
super( new ByteArrayComparator() );
}
/**
* Create a new instance of ByteArraySerializer with custom comparator
*/
public ByteArraySerializer( Comparator comparator )
{
super( comparator );
}
/**
* {@inheritDoc}
*/
public byte[] serialize( byte[] element )
{
int len = -1;
if ( element != null )
{
len = element.length;
}
byte[] bytes = null;
switch ( len )
{
case 0:
bytes = new byte[4];
bytes[0] = 0x00;
bytes[1] = 0x00;
bytes[2] = 0x00;
bytes[3] = 0x00;
break;
case -1:
bytes = new byte[4];
bytes[0] = ( byte ) 0xFF;
bytes[1] = ( byte ) 0xFF;
bytes[2] = ( byte ) 0xFF;
bytes[3] = ( byte ) 0xFF;
break;
default:
bytes = new byte[len + 4];
System.arraycopy( element, 0, bytes, 4, len );
bytes[0] = ( byte ) ( len >>> 24 );
bytes[1] = ( byte ) ( len >>> 16 );
bytes[2] = ( byte ) ( len >>> 8 );
bytes[3] = ( byte ) ( len );
}
return bytes;
}
/**
* Serialize a byte[]
*
* @param buffer the Buffer that will contain the serialized value
* @param start the position in the buffer we will store the serialized byte[]
* @param value the value to serialize
* @return The byte[] containing the serialized byte[]
*/
public static byte[] serialize( byte[] buffer, int start, byte[] element )
{
int len = -1;
if ( element != null )
{
len = element.length;
}
switch ( len )
{
case 0:
buffer[start] = 0x00;
buffer[start + 1] = 0x00;
buffer[start + 2] = 0x00;
buffer[start + 3] = 0x00;
break;
case -1:
buffer[start] = ( byte ) 0xFF;
buffer[start + 1] = ( byte ) 0xFF;
buffer[start + 2] = ( byte ) 0xFF;
buffer[start + 3] = ( byte ) 0xFF;
break;
default:
buffer[start] = ( byte ) ( len >>> 24 );
buffer[start + 1] = ( byte ) ( len >>> 16 );
buffer[start + 2] = ( byte ) ( len >>> 8 );
buffer[start + 3] = ( byte ) ( len );
System.arraycopy( element, 0, buffer, 4 + start, len );
}
return buffer;
}
/**
* A static method used to deserialize a byte array from a byte array.
*
* @param in The byte array containing the byte array
* @return A byte[]
*/
public static byte[] deserialize( byte[] in )
{
if ( ( in == null ) || ( in.length < 4 ) )
{
throw new RuntimeException( "Cannot extract a byte[] from a buffer with not enough bytes" );
}
int len = IntSerializer.deserialize( in );
switch ( len )
{
case 0:
return new byte[]
{};
case -1:
return null;
default:
byte[] result = new byte[len];
System.arraycopy( in, 4, result, 0, len );
return result;
}
}
/**
* A static method used to deserialize a byte array from a byte array.
*
* @param in The byte array containing the byte array
* @param start the position in the byte[] we will deserialize the byte[] from
* @return A byte[]
*/
public static byte[] deserialize( byte[] in, int start )
{
if ( ( in == null ) || ( in.length < 4 + start ) )
{
throw new RuntimeException( "Cannot extract a byte[] from a buffer with not enough bytes" );
}
int len = IntSerializer.deserialize( in, start );
switch ( len )
{
case 0:
return new byte[]
{};
case -1:
return null;
default:
byte[] result = new byte[len];
System.arraycopy( in, 4 + start, result, 0, len );
return result;
}
}
/**
* {@inheritDoc}
*/
public byte[] deserialize( BufferHandler bufferHandler ) throws IOException
{
byte[] in = bufferHandler.read( 4 );
int len = IntSerializer.deserialize( in );
switch ( len )
{
case 0:
return new byte[]
{};
case -1:
return null;
default:
in = bufferHandler.read( len );
return in;
}
}
/**
* {@inheritDoc}
*/
public byte[] deserialize( ByteBuffer buffer ) throws IOException
{
int len = buffer.getInt();
switch ( len )
{
case 0:
return new byte[]
{};
case -1:
return null;
default:
byte[] bytes = new byte[len];
buffer.get( bytes );
return bytes;
}
}
}