| /* |
| * 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.comparator; |
| |
| |
| import java.util.Comparator; |
| |
| |
| /** |
| * Compares byte arrays. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class ByteArrayComparator implements Comparator<byte[]> |
| { |
| /** A static instance of a ByteArrayComparator */ |
| public static final ByteArrayComparator INSTANCE = new ByteArrayComparator(); |
| |
| /** |
| * A private constructor of the ByteArrayComparator class |
| */ |
| private ByteArrayComparator() |
| { |
| } |
| |
| |
| /** |
| * Compare two byte arrays. |
| * |
| * @param byteArray1 First byteArray |
| * @param byteArray2 Second byteArray |
| * @return 1 if byteArray1 > byteArray2, 0 if byteArray1 == byteArray2, -1 if byteArray1 < byteArray2 |
| */ |
| public int compare( byte[] byteArray1, byte[] byteArray2 ) |
| { |
| if ( byteArray1 == byteArray2 ) |
| { |
| return 0; |
| } |
| |
| if ( byteArray1 == null ) |
| { |
| return -1; |
| } |
| else |
| { |
| if ( byteArray2 == null ) |
| { |
| return 1; |
| } |
| else |
| { |
| if ( byteArray1.length < byteArray2.length ) |
| { |
| int pos = 0; |
| |
| for ( byte b1 : byteArray1 ) |
| { |
| byte b2 = byteArray2[pos]; |
| |
| if ( b1 == b2 ) |
| { |
| pos++; |
| } |
| else if ( b1 < b2 ) |
| { |
| return -1; |
| } |
| else |
| { |
| return 1; |
| } |
| } |
| |
| return -1; |
| } |
| else |
| { |
| int pos = 0; |
| |
| for ( byte b2 : byteArray2 ) |
| { |
| byte b1 = byteArray1[pos]; |
| |
| if ( b1 == b2 ) |
| { |
| pos++; |
| } |
| else if ( b1 < b2 ) |
| { |
| return -1; |
| } |
| else |
| { |
| return 1; |
| } |
| } |
| |
| if ( pos < byteArray1.length ) |
| { |
| return 1; |
| } |
| else |
| { |
| return 0; |
| } |
| } |
| } |
| } |
| } |
| } |