| /* |
| * 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.LongComparator; |
| import org.apache.directory.mavibot.btree.exception.SerializerCreationException; |
| |
| |
| /** |
| * The Long serializer. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class LongSerializer extends AbstractElementSerializer<Long> |
| { |
| /** A static instance of a LongSerializer */ |
| public final static LongSerializer INSTANCE = new LongSerializer(); |
| |
| /** |
| * Create a new instance of LongSerializer |
| */ |
| private LongSerializer() |
| { |
| super( LongComparator.INSTANCE ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public byte[] serialize( Long element ) |
| { |
| return serialize( element.longValue() ); |
| } |
| |
| |
| /** |
| * Serialize an long |
| * |
| * @param value the value to serialize |
| * @return The byte[] containing the serialized long |
| */ |
| public static byte[] serialize( long value ) |
| { |
| byte[] bytes = new byte[8]; |
| |
| return serialize( bytes, 0, value ); |
| } |
| |
| |
| /** |
| * Serialize an long |
| * |
| * @param buffer the Buffer that will contain the serialized value |
| * @param start the position in the buffer we will store the serialized long |
| * @param value the value to serialize |
| * @return The byte[] containing the serialized long |
| */ |
| public static byte[] serialize( byte[] buffer, int start, long value ) |
| { |
| buffer[start] = ( byte ) ( value >>> 56 ); |
| buffer[start + 1] = ( byte ) ( value >>> 48 ); |
| buffer[start + 2] = ( byte ) ( value >>> 40 ); |
| buffer[start + 3] = ( byte ) ( value >>> 32 ); |
| buffer[start + 4] = ( byte ) ( value >>> 24 ); |
| buffer[start + 5] = ( byte ) ( value >>> 16 ); |
| buffer[start + 6] = ( byte ) ( value >>> 8 ); |
| buffer[start + 7] = ( byte ) ( value ); |
| |
| return buffer; |
| } |
| |
| |
| /** |
| * A static method used to deserialize a Long from a byte array. |
| * @param in The byte array containing the Long |
| * @param start the position in the byte[] we will deserialize the long from |
| * @return A Long |
| */ |
| public static Long deserialize( byte[] in ) |
| { |
| return deserialize( in, 0 ); |
| } |
| |
| |
| /** |
| * A static method used to deserialize an Integer from a byte array. |
| * @param in The byte array containing the Integer |
| * @param start the position in the byte[] we will deserialize the long from |
| * @return An Integer |
| */ |
| public static Long deserialize( byte[] in, int start ) |
| { |
| if ( ( in == null ) || ( in.length < 8 + start ) ) |
| { |
| throw new SerializerCreationException( "Cannot extract a Long from a buffer with not enough bytes" ); |
| } |
| |
| long result = ( ( long ) in[start] << 56 ) + |
| ( ( in[start + 1] & 0xFFL ) << 48 ) + |
| ( ( in[start + 2] & 0xFFL ) << 40 ) + |
| ( ( in[start + 3] & 0xFFL ) << 32 ) + |
| ( ( in[start + 4] & 0xFFL ) << 24 ) + |
| ( ( in[start + 5] & 0xFFL ) << 16 ) + |
| ( ( in[start + 6] & 0xFFL ) << 8 ) + |
| ( in[start + 7] & 0xFFL ); |
| |
| return result; |
| } |
| |
| |
| /** |
| * A method used to deserialize a Long from a byte array. |
| * @param in The byte array containing the Long |
| * @param start the position in the byte[] we will deserialize the long from |
| * @return A Long |
| */ |
| public Long fromBytes( byte[] in ) |
| { |
| return deserialize( in, 0 ); |
| } |
| |
| |
| /** |
| * A method used to deserialize an Integer from a byte array. |
| * @param in The byte array containing the Integer |
| * @param start the position in the byte[] we will deserialize the long from |
| * @return An Integer |
| */ |
| public Long fromBytes( byte[] in, int start ) |
| { |
| if ( ( in == null ) || ( in.length < 8 + start ) ) |
| { |
| throw new SerializerCreationException( "Cannot extract a Long from a buffer with not enough bytes" ); |
| } |
| |
| long result = ( ( long ) in[start] << 56 ) + |
| ( ( in[start + 1] & 0xFFL ) << 48 ) + |
| ( ( in[start + 2] & 0xFFL ) << 40 ) + |
| ( ( in[start + 3] & 0xFFL ) << 32 ) + |
| ( ( in[start + 4] & 0xFFL ) << 24 ) + |
| ( ( in[start + 5] & 0xFFL ) << 16 ) + |
| ( ( in[start + 6] & 0xFFL ) << 8 ) + |
| ( in[start + 7] & 0xFFL ); |
| |
| return result; |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Long deserialize( BufferHandler bufferHandler ) throws IOException |
| { |
| byte[] in = bufferHandler.read( 8 ); |
| |
| return deserialize( in ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Long deserialize( ByteBuffer buffer ) throws IOException |
| { |
| return buffer.getLong(); |
| } |
| } |