beagled/Lucene.Net/Util/StringHelper.cs

   1 /*
   2  * Copyright 2004 The Apache Software Foundation
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 using System;
  18
  19 namespace Lucene.Net.Util
  20 {
  21
  22
  23         /// <summary> Methods for manipulating strings.
  24         ///
  25         /// $Id: StringHelper.cs,v 1.3 2006/10/02 17:09:10 joeshaw Exp $
  26         /// </summary>
  27         public abstract class StringHelper
  28         {
  29
  30                 /// <summary> Compares two strings, character by character, and returns the
  31                 /// first position where the two strings differ from one another.
  32                 ///
  33                 /// </summary>
  34                 /// <param name="s1">The first string to compare
  35                 /// </param>
  36                 /// <param name="s2">The second string to compare
  37                 /// </param>
  38                 /// <returns> The first position where the two strings differ.
  39                 /// </returns>
  40                 public static int StringDifference(System.String s1, System.String s2)
  41                 {
  42                         int len1 = s1.Length;
  43                         int len2 = s2.Length;
  44                         int len = len1 < len2?len1:len2;
  45                         for (int i = 0; i < len; i++)
  46                         {
  47                                 if (s1[i] != s2[i])
  48                                 {
  49                                         return i;
  50                                 }
  51                         }
  52                         return len;
  53                 }
  54
  55
  56                 private StringHelper()
  57                 {
  58                 }
  59         }
  60 }