/*
* 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.CharArrayComparator;
/**
* A serializer for a char[].
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public class CharArraySerializer extends AbstractElementSerializer<char[]>
{
/**
* Create a new instance of CharArraySerializer
*/
public CharArraySerializer()
{
super( new CharArrayComparator() );
}
/**
* {@inheritDoc}
*/
public byte[] serialize( char[] 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 * 2 + 4];
int pos = 4;
bytes[0] = ( byte ) ( len >>> 24 );
bytes[1] = ( byte ) ( len >>> 16 );
bytes[2] = ( byte ) ( len >>> 8 );
bytes[3] = ( byte ) ( len );
for ( char c : element )
{
bytes[pos++] = ( byte ) ( c >>> 8 );
bytes[pos++] = ( byte ) ( c );
}
}
return bytes;
}
/**
* A static method used to deserialize a char array from a byte array.
*
* @param in The byte array containing the char array
* @return A char[]
*/
public static char[] 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 char[]
{};
case -1:
return null;
default:
char[] result = new char[len];
for ( int i = 4; i < len * 2 + 4; i += 2 )
{
result[i] = Character.valueOf( ( char ) ( ( in[i] << 8 ) +
( in[i + 1] & 0xFF ) ) );
}
return result;
}
}
/**
* A method used to deserialize a char array from a byte array.
*
* @param in The byte array containing the char array
* @return A char[]
*/
public char[] fromBytes( byte[] in, int start )
{
if ( ( in == null ) || ( in.length - start < 4 ) )
{
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 char[]
{};
case -1:
return null;
default:
char[] result = new char[len];
for ( int i = 4; i < len * 2 + 4; i += 2 )
{
result[i] = Character.valueOf( ( char ) ( ( in[i] << 8 ) +
( in[i + 1] & 0xFF ) ) );
}
return result;
}
}
/**
* A method used to deserialize a char array from a byte array.
*
* @param in The byte array containing the char array
* @return A char[]
*/
public char[] fromBytes( 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 char[]
{};
case -1:
return null;
default:
char[] result = new char[len];
for ( int i = 4; i < len * 2 + 4; i += 2 )
{
result[i] = Character.valueOf( ( char ) ( ( in[i] << 8 ) +
( in[i + 1] & 0xFF ) ) );
}
return result;
}
}
/**
* {@inheritDoc}
*/
public char[] deserialize( BufferHandler bufferHandler ) throws IOException
{
byte[] in = bufferHandler.read( 4 );
int len = IntSerializer.deserialize( in );
switch ( len )
{
case 0:
return new char[]
{};
case -1:
return null;
default:
char[] result = new char[len];
byte[] buffer = bufferHandler.read( len * 2 );
for ( int i = 0; i < len * 2; i += 2 )
{
result[i] = Character.valueOf( ( char ) ( ( buffer[i] << 8 ) +
( buffer[i + 1] & 0xFF ) ) );
}
return result;
}
}
/**
* {@inheritDoc}
*/
public char[] deserialize( ByteBuffer buffer ) throws IOException
{
int len = buffer.getInt();
switch ( len )
{
case 0:
return new char[]
{};
case -1:
return null;
default:
char[] result = new char[len];
for ( int i = 0; i < len; i++ )
{
result[i] = buffer.getChar();
}
return result;
}
}
}