DifferencesIterator


1   /*******************************************************************************
2    * Copyright (c) 2000, 2006 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.compare.rangedifferencer;
12  
13  import java.util.ArrayList  ;
14  import java.util.List  ;
15  
16  /**
17   * A custom iterator to iterate over a List of <code>RangeDifferences</code>.
18   * It is used internally by the <code>RangeDifferencer</code>.
19   */
20  /* package */ class DifferencesIterator {
21  
22      List   fRange;
23      int fIndex;
24      RangeDifference[] fArray;   
25      RangeDifference fDifference;
26      
27      /*
28       * Creates a differences iterator on an array of <code>RangeDifference</code>s.
29       */
30      DifferencesIterator(RangeDifference[] differenceRanges) {
31          
32          fArray= differenceRanges;
33          fIndex= 0;
34          fRange= new ArrayList  ();
35          if (fIndex < fArray.length)
36              fDifference= fArray[fIndex++];
37          else
38              fDifference= null;
39      }
40  
41      /*
42        * Returns the number of RangeDifferences
43        */
44      int getCount() {
45          return fRange.size();
46      }
47  
48      /*
49       * Appends the edit to its list and moves to the next <code>RangeDifference</code>.
50       */
51      void next() {
52          fRange.add(fDifference);
53          if (fDifference != null) {
54              if (fIndex < fArray.length)
55                  fDifference= fArray[fIndex++];
56              else
57                  fDifference= null;
58          }
59      }
60  
61      /*
62       * Difference iterators are used in pairs.
63       * This method returns the other iterator.
64       */
65      DifferencesIterator other(DifferencesIterator right, DifferencesIterator left) {
66          if (this == right)
67              return left;
68          return right;
69      }
70  
71      /*
72        * Removes all <code>RangeDifference</code>s
73        */
74      void removeAll() {
75          fRange.clear();
76      }
77  }
78
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