| /* |
| * 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.LongArrayComparator; |
| |
| |
| /** |
| * A serializer for a Long[]. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class LongArraySerializer extends AbstractElementSerializer<long[]> |
| { |
| /** |
| * Create a new instance of LongSerializer |
| */ |
| public LongArraySerializer() |
| { |
| super( new LongArrayComparator() ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public byte[] serialize( long[] element ) |
| { |
| int len = -1; |
| |
| if ( element != null ) |
| { |
| len = element.length; |
| } |
| |
| byte[] bytes = null; |
| |
| switch ( len ) |
| { |
| case 0: |
| bytes = new byte[4]; |
| |
| bytes[0] = 0x00; |
| bytes[1] = 0x00; |
| bytes[2] = 0x00; |
| bytes[3] = 0x00; |
| |
| break; |
| |
| case -1: |
| bytes = new byte[4]; |
| |
| bytes[0] = ( byte ) 0xFF; |
| bytes[1] = ( byte ) 0xFF; |
| bytes[2] = ( byte ) 0xFF; |
| bytes[3] = ( byte ) 0xFF; |
| |
| break; |
| |
| default: |
| bytes = new byte[len * 8 + 4]; |
| int pos = 0; |
| |
| // The number of longs |
| bytes[pos++] = ( byte ) ( len >>> 24 ); |
| bytes[pos++] = ( byte ) ( len >>> 16 ); |
| bytes[pos++] = ( byte ) ( len >>> 8 ); |
| bytes[pos++] = ( byte ) ( len ); |
| |
| // Serialize the longs now |
| for ( long value : element ) |
| { |
| bytes[pos++] = ( byte ) ( value >>> 56 ); |
| bytes[pos++] = ( byte ) ( value >>> 48 ); |
| bytes[pos++] = ( byte ) ( value >>> 40 ); |
| bytes[pos++] = ( byte ) ( value >>> 32 ); |
| bytes[pos++] = ( byte ) ( value >>> 24 ); |
| bytes[pos++] = ( byte ) ( value >>> 16 ); |
| bytes[pos++] = ( byte ) ( value >>> 8 ); |
| bytes[pos++] = ( byte ) ( value ); |
| } |
| } |
| |
| return bytes; |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public long[] deserialize( BufferHandler bufferHandler ) throws IOException |
| { |
| byte[] in = bufferHandler.read( 4 ); |
| |
| int len = IntSerializer.deserialize( in ); |
| |
| switch ( len ) |
| { |
| case 0: |
| return new long[] |
| {}; |
| |
| case -1: |
| return null; |
| |
| default: |
| long[] longs = new long[len]; |
| |
| int pos = 4; |
| |
| for ( int i = 0; i < len; i++ ) |
| { |
| longs[i] = ( ( long ) in[pos++] << 56 ) + |
| ( ( in[pos++] & 0xFFL ) << 48 ) + |
| ( ( in[pos++] & 0xFFL ) << 40 ) + |
| ( ( in[pos++] & 0xFFL ) << 32 ) + |
| ( ( in[pos++] & 0xFFL ) << 24 ) + |
| ( ( in[pos++] & 0xFFL ) << 16 ) + |
| ( ( in[pos++] & 0xFFL ) << 8 ) + |
| ( in[pos++] & 0xFFL ); |
| } |
| |
| return longs; |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public long[] deserialize( ByteBuffer buffer ) throws IOException |
| { |
| int len = buffer.getInt(); |
| |
| switch ( len ) |
| { |
| case 0: |
| return new long[] |
| {}; |
| |
| case -1: |
| return null; |
| |
| default: |
| long[] longs = new long[len]; |
| |
| for ( int i = 0; i < len; i++ ) |
| { |
| longs[i] = buffer.getLong(); |
| } |
| |
| return longs; |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public int compare( long[] type1, long[] type2 ) |
| { |
| if ( type1 == type2 ) |
| { |
| return 0; |
| } |
| |
| if ( type1 == null ) |
| { |
| if ( type2 == null ) |
| { |
| return 0; |
| } |
| else |
| { |
| return -1; |
| } |
| } |
| else |
| { |
| if ( type2 == null ) |
| { |
| return 1; |
| } |
| else |
| { |
| if ( type1.length < type2.length ) |
| { |
| int pos = 0; |
| |
| for ( long b1 : type1 ) |
| { |
| long b2 = type2[pos]; |
| |
| if ( b1 == b2 ) |
| { |
| pos++; |
| } |
| else if ( b1 < b2 ) |
| { |
| return -1; |
| } |
| else |
| { |
| return 1; |
| } |
| } |
| |
| return 1; |
| } |
| else |
| { |
| int pos = 0; |
| |
| for ( long b2 : type2 ) |
| { |
| long b1 = type1[pos]; |
| |
| if ( b1 == b2 ) |
| { |
| pos++; |
| } |
| else if ( b1 < b2 ) |
| { |
| return -1; |
| } |
| else |
| { |
| return 1; |
| } |
| } |
| |
| return -11; |
| } |
| } |
| } |
| } |
| |
| |
| @Override |
| public long[] fromBytes( byte[] buffer ) throws IOException |
| { |
| int len = IntSerializer.deserialize( buffer ); |
| int pos = 4; |
| |
| switch ( len ) |
| { |
| case 0: |
| return new long[] |
| {}; |
| |
| case -1: |
| return null; |
| |
| default: |
| long[] longs = new long[len]; |
| |
| for ( int i = 0; i < len; i++ ) |
| { |
| longs[i] = LongSerializer.deserialize( buffer, pos ); |
| pos += 8; |
| } |
| |
| return longs; |
| } |
| } |
| |
| |
| @Override |
| public long[] fromBytes( byte[] buffer, int pos ) throws IOException |
| { |
| int newPos = pos; |
| int len = IntSerializer.deserialize( buffer, newPos ); |
| |
| switch ( len ) |
| { |
| case 0: |
| return new long[] |
| {}; |
| |
| case -1: |
| return null; |
| |
| default: |
| long[] longs = new long[len]; |
| |
| for ( int i = 0; i < len; i++ ) |
| { |
| longs[i] = LongSerializer.deserialize( buffer, newPos ); |
| newPos += 8; |
| } |
| |
| return longs; |
| } |
| } |
| } |