| /* |
| * 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.nutch.crawl; |
| |
| import java.util.Comparator; |
| |
| public class SignatureComparator implements Comparator<Object> { |
| public int compare(Object o1, Object o2) { |
| return _compare(o1, o2); |
| } |
| |
| public static int _compare(Object o1, Object o2) { |
| if (o1 == null && o2 == null) |
| return 0; |
| if (o1 == null) |
| return -1; |
| if (o2 == null) |
| return 1; |
| if (!(o1 instanceof byte[])) |
| return -1; |
| if (!(o2 instanceof byte[])) |
| return 1; |
| byte[] data1 = (byte[]) o1; |
| byte[] data2 = (byte[]) o2; |
| return _compare(data1, 0, data1.length, data2, 0, data2.length); |
| } |
| |
| public static int _compare(byte[] data1, int s1, int l1, byte[] data2, |
| int s2, int l2) { |
| if (l2 > l1) |
| return -1; |
| if (l2 < l1) |
| return 1; |
| int res = 0; |
| for (int i = 0; i < l1; i++) { |
| res = (data1[s1 + i] - data2[s2 + i]); |
| if (res != 0) |
| return res; |
| } |
| return 0; |
| } |
| } |