1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 *
19 */
20 package org.apache.directory.mavibot.btree.serializer;
21
22
23 import java.io.IOException;
24 import java.nio.ByteBuffer;
25
26 import org.apache.directory.mavibot.btree.comparator.CharComparator;
27
28
29 /**
30 * The Character serializer.
31 *
32 * @author <a href="mailto:labs@labs.apache.org">Mavibot labs Project</a>
33 */
34 public class CharSerializer extends AbstractElementSerializer<Character>
35 {
36 /**
37 * Create a new instance of CharSerializer
38 */
39 public CharSerializer()
40 {
41 super( new CharComparator() );
42 }
43
44
45 /**
46 * {@inheritDoc}
47 */
48 public byte[] serialize( Character element )
49 {
50 byte[] bytes = new byte[2];
51
52 return serialize( bytes, 0, element );
53 }
54
55
56 /**
57 * Serialize a char
58 *
59 * @param value the value to serialize
60 * @return The byte[] containing the serialized char
61 */
62 public static byte[] serialize( char value )
63 {
64 byte[] bytes = new byte[2];
65
66 return serialize( bytes, 0, value );
67 }
68
69
70 /**
71 * Serialize a char
72 *
73 * @param buffer the Buffer that will contain the serialized value
74 * @param start the position in the buffer we will store the serialized char
75 * @param value the value to serialize
76 * @return The byte[] containing the serialized char
77 */
78 public static byte[] serialize( byte[] buffer, int start, char value )
79 {
80 buffer[start] = ( byte ) ( value >>> 8 );
81 buffer[start + 1] = ( byte ) ( value );
82
83 return buffer;
84 }
85
86
87 /**
88 * A static method used to deserialize a Character from a byte array.
89 * @param in The byte array containing the Character
90 * @return A Character
91 */
92 public static Character deserialize( byte[] in )
93 {
94 return deserialize( in, 0 );
95 }
96
97
98 /**
99 * A static method used to deserialize a Character from a byte array.
100 * @param in The byte array containing the Character
101 * @param start the position in the byte[] we will deserialize the char from
102 * @return A Character
103 */
104 public static Character deserialize( byte[] in, int start )
105 {
106 if ( ( in == null ) || ( in.length < 2 + start ) )
107 {
108 throw new RuntimeException( "Cannot extract a Character from a buffer with not enough bytes" );
109 }
110
111 return Character.valueOf( ( char ) ( ( in[start] << 8 ) +
112 ( in[start + 1] & 0xFF ) ) );
113 }
114
115
116 /**
117 * {@inheritDoc}
118 */
119 public Character deserialize( ByteBuffer buffer ) throws IOException
120 {
121 return buffer.getChar();
122 }
123
124
125 /**
126 * {@inheritDoc}
127 */
128 public Character deserialize( BufferHandler bufferHandler ) throws IOException
129 {
130 byte[] in = bufferHandler.read( 2 );
131
132 return deserialize( in );
133 }
134 }