SourceLocatorMementoComparator


1   /*******************************************************************************
2    * Copyright (c) 2000, 2005 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    * 
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.debug.internal.core.sourcelookup;
12  
13  import java.util.Comparator  ;
14  
15  /**
16   * Comparator for source locator mementors. Ignores whitespace differences.
17   * 
18   * @since 3.0
19   */
20  public class SourceLocatorMementoComparator implements Comparator   {
21      /* (non-Javadoc)
22       * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
23       */
24      public int compare(Object   o1, Object   o2) {
25          String   m1 = (String  )o1;
26          String   m2 = (String  )o2;
27          int i1 = 0, i2 = 0;
28          while (i1 < m1.length()) {
29              i1 = skipWhitespace(m1, i1);
30              i2 = skipWhitespace(m2, i2);
31              if (i1 < m1.length() && i2 < m2.length()) {
32                  if (m1.charAt(i1) != m2.charAt(i2)) {
33                      return -1;
34                  }
35                  i1++;
36                  i2++;
37              } else {
38                  if (i2 < m2.length()) {
39                      return -1;
40                  } 
41                  return 0;
42              }
43          }
44          return 0;
45      }
46      
47      private int skipWhitespace(String   string, int offset) {
48          while (offset < string.length() && Character.isWhitespace(string.charAt(offset))) {
49              offset++;
50          }
51          return offset;
52      }
53  }
54
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