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.ShortComparator;
27 import org.apache.directory.mavibot.btree.exception.SerializerCreationException;
28
29
30 /**
31 * The Short serializer.
32 *
33 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
34 */
35 public class ShortSerializer extends AbstractElementSerializer<Short>
36 {
37 /** A static instance of a ShortSerializer */
38 public final static ShortSerializer INSTANCE = new ShortSerializer();
39
40 /**
41 * Create a new instance of ShortSerializer
42 */
43 private ShortSerializer()
44 {
45 super( ShortComparator.INSTANCE );
46 }
47
48
49 /**
50 * {@inheritDoc}
51 */
52 public byte[] serialize( Short element )
53 {
54 byte[] bytes = new byte[2];
55
56 return serialize( bytes, 0, element );
57 }
58
59
60 /**
61 * Serialize a short
62 *
63 * @param value the value to serialize
64 * @return The byte[] containing the serialized short
65 */
66 public static byte[] serialize( short value )
67 {
68 byte[] bytes = new byte[2];
69
70 return serialize( bytes, 0, value );
71 }
72
73
74 /**
75 * Serialize a short
76 *
77 * @param buffer the Buffer that will contain the serialized value
78 * @param start the position in the buffer we will store the serialized short
79 * @param value the value to serialize
80 * @return The byte[] containing the serialized short
81 */
82 public static byte[] serialize( byte[] buffer, int start, short value )
83 {
84 buffer[start] = ( byte ) ( value >>> 8 );
85 buffer[start + 1] = ( byte ) ( value );
86
87 return buffer;
88 }
89
90
91 /**
92 * A static method used to deserialize a Short from a byte array.
93 * @param in The byte array containing the Short
94 * @return A Short
95 */
96 public static Short deserialize( byte[] in )
97 {
98 return deserialize( in, 0 );
99 }
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 }