01: package org.apache.lucene.util;
02:
03: /**
04: * Licensed to the Apache Software Foundation (ASF) under one or more
05: * contributor license agreements. See the NOTICE file distributed with
06: * this work for additional information regarding copyright ownership.
07: * The ASF licenses this file to You under the Apache License, Version 2.0
08: * (the "License"); you may not use this file except in compliance with
09: * the License. You may obtain a copy of the License at
10: *
11: * http://www.apache.org/licenses/LICENSE-2.0
12: *
13: * Unless required by applicable law or agreed to in writing, software
14: * distributed under the License is distributed on an "AS IS" BASIS,
15: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16: * See the License for the specific language governing permissions and
17: * limitations under the License.
18: */
19:
20: /**
21: * Methods for manipulating strings.
22: *
23: * $Id: StringHelper.java 472959 2006-11-09 16:21:50Z yonik $
24: */
25: public abstract class StringHelper {
26:
27: /**
28: * Compares two strings, character by character, and returns the
29: * first position where the two strings differ from one another.
30: *
31: * @param s1 The first string to compare
32: * @param s2 The second string to compare
33: * @return The first position where the two strings differ.
34: */
35: public static final int stringDifference(String s1, String s2) {
36: int len1 = s1.length();
37: int len2 = s2.length();
38: int len = len1 < len2 ? len1 : len2;
39: for (int i = 0; i < len; i++) {
40: if (s1.charAt(i) != s2.charAt(i)) {
41: return i;
42: }
43: }
44: return len;
45: }
46:
47: private StringHelper() {
48: }
49: }
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