OrderedCollectionDiff


1   
2   /*
3    * Copyright (c) 1998 - 2005 Versant Corporation
4    * All rights reserved. This program and the accompanying materials
5    * are made available under the terms of the Eclipse Public License v1.0
6    * which accompanies this distribution, and is available at
7    * http://www.eclipse.org/legal/epl-v10.html
8    *
9    * Contributors:
10   * Versant Corporation - initial API and implementation
11   */
12  package com.versant.core.common;
13  
14  import com.versant.core.util.OIDObjectOutput;
15  import com.versant.core.util.OIDObjectInput;
16  
17  import java.io.IOException  ;
18  
19  /**
20   * This holds the differences between two ordered collections. It is stored
21   * in the new State when changes to an ordered collection field are persisted.
22   */
23  public class OrderedCollectionDiff extends CollectionDiff {
24  
25      public OrderedCollectionDiff() {
26      }
27  
28      public OrderedCollectionDiff(VersantFieldMetaData fmd) {
29          super(fmd);
30      }
31  
32      /**
33       * The indexes of all deleted values. These must be in ascending order.
34       */
35      public int[] deletedIndexes;
36  
37      /**
38       * The indexes of all inserted values. This array will be the same size
39       * as insertedValues. These must be in ascending order.
40       */
41      public int[] insertedIndexes;
42  
43      public String   toString() {
44          return "<OrderedCollectionDiff inserted = " + (insertedIndexes != null ? insertedIndexes.length : 0)
45                  + " deleted = " + (deletedIndexes != null ? deletedIndexes.length : 0);
46      }
47  
48      public void writeExternal(OIDObjectOutput out) throws IOException   {
49          super.writeExternal(out);
50          SerUtils.writeIntArray(deletedIndexes, out);
51          SerUtils.writeIntArray(insertedIndexes, out);
52      }
53  
54      public void readExternal(OIDObjectInput in) throws IOException  ,
55              ClassNotFoundException   {
56          super.readExternal(in);
57          deletedIndexes = SerUtils.readIntArray(in);
58          insertedIndexes = SerUtils.readIntArray(in);
59      }
60  
61  }
62
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