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20 package org.apache.directory.mavibot.btree.serializer;
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23 import java.io.IOException;
24 import java.nio.ByteBuffer;
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26 import org.apache.directory.mavibot.btree.comparator.LongComparator;
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34 public class LongSerializer extends AbstractElementSerializer<Long>
35 {
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39 public LongSerializer()
40 {
41 super( new LongComparator() );
42 }
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48 public byte[] serialize( Long element )
49 {
50 return serialize( element.longValue() );
51 }
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60 public static byte[] serialize( long value )
61 {
62 byte[] bytes = new byte[8];
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64 return serialize( bytes, 0, value );
65 }
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76 public static byte[] serialize( byte[] buffer, int start, long value )
77 {
78 buffer[start] = ( byte ) ( value >>> 56 );
79 buffer[start + 1] = ( byte ) ( value >>> 48 );
80 buffer[start + 2] = ( byte ) ( value >>> 40 );
81 buffer[start + 3] = ( byte ) ( value >>> 32 );
82 buffer[start + 4] = ( byte ) ( value >>> 24 );
83 buffer[start + 5] = ( byte ) ( value >>> 16 );
84 buffer[start + 6] = ( byte ) ( value >>> 8 );
85 buffer[start + 7] = ( byte ) ( value );
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87 return buffer;
88 }
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97 public static Long deserialize( byte[] in )
98 {
99 return deserialize( in, 0 );
100 }
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109 public static Long deserialize( byte[] in, int start )
110 {
111 if ( ( in == null ) || ( in.length < 8 + start ) )
112 {
113 throw new RuntimeException( "Cannot extract a Long from a buffer with not enough bytes" );
114 }
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116 long result = ( ( long ) in[start] << 56 ) +
117 ( ( in[start + 1] & 0xFFL ) << 48 ) +
118 ( ( in[start + 2] & 0xFFL ) << 40 ) +
119 ( ( in[start + 3] & 0xFFL ) << 32 ) +
120 ( ( in[start + 4] & 0xFFL ) << 24 ) +
121 ( ( in[start + 5] & 0xFFL ) << 16 ) +
122 ( ( in[start + 6] & 0xFFL ) << 8 ) +
123 ( in[start + 7] & 0xFFL );
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125 return result;
126 }
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135 public Long fromBytes( byte[] in )
136 {
137 return deserialize( in, 0 );
138 }
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147 public Long fromBytes( byte[] in, int start )
148 {
149 if ( ( in == null ) || ( in.length < 8 + start ) )
150 {
151 throw new RuntimeException( "Cannot extract a Long from a buffer with not enough bytes" );
152 }
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154 long result = ( ( long ) in[start] << 56 ) +
155 ( ( in[start + 1] & 0xFFL ) << 48 ) +
156 ( ( in[start + 2] & 0xFFL ) << 40 ) +
157 ( ( in[start + 3] & 0xFFL ) << 32 ) +
158 ( ( in[start + 4] & 0xFFL ) << 24 ) +
159 ( ( in[start + 5] & 0xFFL ) << 16 ) +
160 ( ( in[start + 6] & 0xFFL ) << 8 ) +
161 ( in[start + 7] & 0xFFL );
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163 return result;
164 }
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170 public Long deserialize( BufferHandler bufferHandler ) throws IOException
171 {
172 byte[] in = bufferHandler.read( 8 );
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174 return deserialize( in );
175 }
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181 public Long deserialize( ByteBuffer buffer ) throws IOException
182 {
183 return buffer.getLong();
184 }
185 }