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Java > Open Source Codes > org > apache > lucene > util > StringHelper


1 package org.apache.lucene.util;
2
3 /**
4  * Copyright 2004 The Apache Software Foundation
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18
19
20 /**
21  * Methods for manipulating strings.
22  *
23  * $Id: StringHelper.java 150248 2004-03-25 13:39:59Z otis $
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 JavaDoc s1, String JavaDoc 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
48   private StringHelper() {
49   }
50 }
51
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