| /* |
| * 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; |
| import org.apache.directory.mavibot.btree.exception.SerializerCreationException; |
| |
| |
| /** |
| * 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 SerializerCreationException( "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 SerializerCreationException( "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 SerializerCreationException( "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; |
| } |
| } |
| } |