01 package gate.creole.annic.apache.lucene.util;
02
03 /**
04 * Copyright 2004 The Apache Software Foundation
05 *
06 * Licensed under the Apache License, Version 2.0 (the "License");
07 * you may not use this file except in compliance with the License.
08 * You may obtain a copy of the License at
09 *
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 529 2004-10-05 11:55:26Z niraj $
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
48 private StringHelper() {
49 }
50 }
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