/*
* 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 org.apache.directory.mavibot.btree.comparator.IntComparator;
import org.apache.directory.mavibot.btree.exception.SerializerCreationException;
/**
* The Integer serializer.
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public class IntSerializer extends AbstractElementSerializer<Integer>
{
/**
* Create a new instance of IntSerializer
*/
public IntSerializer()
{
super( new IntComparator() );
}
/**
* A static method used to deserialize an Integer from a byte array.
* @param in The byte array containing the Integer
* @return An Integer
*/
public static Integer deserialize( byte[] in )
{
return deserialize( in, 0 );
}
/**
* A static method used to deserialize an Integer from a byte array.
* @param in The byte array containing the Integer
* @param start the position in the byte[] we will deserialize the int from
* @return An Integer
*/
public static Integer deserialize( byte[] in, int start )
{
if ( ( in == null ) || ( in.length < 4 + start ) )
{
throw new SerializerCreationException( "Cannot extract a Integer from a buffer with not enough bytes" );
}
return ( in[start] << 24 ) +
( ( in[start + 1] & 0xFF ) << 16 ) +
( ( in[start + 2] & 0xFF ) << 8 ) +
( in[start + 3] & 0xFF );
}
/**
* A method used to deserialize an Integer from a byte array.
* @param in The byte array containing the Integer
* @return An Integer
*/
public Integer fromBytes( byte[] in )
{
return deserialize( in, 0 );
}
/**
* A method used to deserialize an Integer from a byte array.
* @param in The byte array containing the Integer
* @param start the position in the byte[] we will deserialize the int from
* @return An Integer
*/
public Integer fromBytes( byte[] in, int start )
{
if ( ( in == null ) || ( in.length < 4 + start ) )
{
throw new SerializerCreationException( "Cannot extract a Integer from a buffer with not enough bytes" );
}
return ( in[start] << 24 ) +
( ( in[start + 1] & 0xFF ) << 16 ) +
( ( in[start + 2] & 0xFF ) << 8 ) +
( in[start + 3] & 0xFF );
}
/**
* {@inheritDoc}
*/
public Integer deserialize( ByteBuffer buffer ) throws IOException
{
return buffer.getInt();
}
/**
* {@inheritDoc}
*/
public Integer deserialize( BufferHandler bufferHandler ) throws IOException
{
byte[] in = bufferHandler.read( 4 );
return deserialize( in );
}
/**
* {@inheritDoc}
*/
public byte[] serialize( Integer element )
{
return serialize( element.intValue() );
}
/**
* Serialize an int
*
* @param value the value to serialize
* @return The byte[] containing the serialized int
*/
public static byte[] serialize( int value )
{
byte[] bytes = new byte[4];
return serialize( bytes, 0, value );
}
/**
* Serialize an int
*
* @param buffer the Buffer that will contain the serialized value
* @param start the position in the buffer we will store the serialized int
* @param value the value to serialize
* @return The byte[] containing the serialized int
*/
public static byte[] serialize( byte[] buffer, int start, int value )
{
buffer[start] = ( byte ) ( value >>> 24 );
buffer[start + 1] = ( byte ) ( value >>> 16 );
buffer[start + 2] = ( byte ) ( value >>> 8 );
buffer[start + 3] = ( byte ) ( value );
return buffer;
}
}