001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020package org.apache.directory.mavibot.btree.serializer; 021 022 023import java.io.IOException; 024import java.nio.ByteBuffer; 025 026import org.apache.directory.mavibot.btree.comparator.ShortComparator; 027import org.apache.directory.mavibot.btree.exception.SerializerCreationException; 028 029 030/** 031 * The Short serializer. 032 * 033 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 034 */ 035public class ShortSerializer extends AbstractElementSerializer<Short> 036{ 037 /** A static instance of a ShortSerializer */ 038 public final static ShortSerializer INSTANCE = new ShortSerializer(); 039 040 /** 041 * Create a new instance of ShortSerializer 042 */ 043 private ShortSerializer() 044 { 045 super( ShortComparator.INSTANCE ); 046 } 047 048 049 /** 050 * {@inheritDoc} 051 */ 052 public byte[] serialize( Short element ) 053 { 054 byte[] bytes = new byte[2]; 055 056 return serialize( bytes, 0, element ); 057 } 058 059 060 /** 061 * Serialize a short 062 * 063 * @param value the value to serialize 064 * @return The byte[] containing the serialized short 065 */ 066 public static byte[] serialize( short value ) 067 { 068 byte[] bytes = new byte[2]; 069 070 return serialize( bytes, 0, value ); 071 } 072 073 074 /** 075 * Serialize a short 076 * 077 * @param buffer the Buffer that will contain the serialized value 078 * @param start the position in the buffer we will store the serialized short 079 * @param value the value to serialize 080 * @return The byte[] containing the serialized short 081 */ 082 public static byte[] serialize( byte[] buffer, int start, short value ) 083 { 084 buffer[start] = ( byte ) ( value >>> 8 ); 085 buffer[start + 1] = ( byte ) ( value ); 086 087 return buffer; 088 } 089 090 091 /** 092 * A static method used to deserialize a Short from a byte array. 093 * @param in The byte array containing the Short 094 * @return A Short 095 */ 096 public static Short deserialize( byte[] in ) 097 { 098 return deserialize( in, 0 ); 099 } 100 101 102 /** 103 * A static method used to deserialize a Short from a byte array. 104 * @param in The byte array containing the Short 105 * @param start the position in the byte[] we will deserialize the short from 106 * @return A Short 107 */ 108 public static Short deserialize( byte[] in, int start ) 109 { 110 if ( ( in == null ) || ( in.length < 2 + start ) ) 111 { 112 throw new SerializerCreationException( "Cannot extract a Short from a buffer with not enough bytes" ); 113 } 114 115 return ( short ) ( ( in[start] << 8 ) + ( in[start + 1] & 0xFF ) ); 116 } 117 118 119 /** 120 * A method used to deserialize a Short from a byte array. 121 * @param in The byte array containing the Short 122 * @return A Short 123 */ 124 public Short fromBytes( byte[] in ) 125 { 126 return deserialize( in, 0 ); 127 } 128 129 130 /** 131 * A method used to deserialize a Short from a byte array. 132 * @param in The byte array containing the Short 133 * @param start the position in the byte[] we will deserialize the short from 134 * @return A Short 135 */ 136 public Short fromBytes( byte[] in, int start ) 137 { 138 if ( ( in == null ) || ( in.length < 2 + start ) ) 139 { 140 throw new SerializerCreationException( "Cannot extract a Short from a buffer with not enough bytes" ); 141 } 142 143 return ( short ) ( ( in[start] << 8 ) + ( in[start + 1] & 0xFF ) ); 144 } 145 146 147 /** 148 * {@inheritDoc} 149 */ 150 public Short deserialize( ByteBuffer buffer ) throws IOException 151 { 152 return buffer.getShort(); 153 } 154 155 156 /** 157 * {@inheritDoc} 158 */ 159 public Short deserialize( BufferHandler bufferHandler ) throws IOException 160 { 161 byte[] in = bufferHandler.read( 2 ); 162 163 return deserialize( in ); 164 } 165}