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Java > Open Source Codes > org > objectstyle > cayenne > graph > OperationRecorder


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
5  *
6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution, if any,
22  * must include the following acknowlegement:
23  * "This product includes software developed by independent contributors
24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
30  * permission. For written permission, email
31  * "andrus at objectstyle dot org".
32  *
33  * 5. Products derived from this software may not be called "ObjectStyle"
34  * or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
35  * names without prior written permission.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40  * DISCLAIMED. IN NO EVENT SHALL THE OBJECTSTYLE GROUP OR
41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
49  * ====================================================================
50  *
51  * This software consists of voluntary contributions made by many
52  * individuals and hosted on ObjectStyle Group web site. For more
53  * information on the ObjectStyle Group, please see
54  * <http://objectstyle.org/>.
55  */

56 package org.objectstyle.cayenne.graph;
57
58 import java.util.ArrayList JavaDoc;
59 import java.util.Collections JavaDoc;
60 import java.util.List JavaDoc;
61
62 /**
63  * Stores individual graph changes as GraphDiff "operations" that can be replayed later.
64  * Note that this implementation is not synchronized; synchronization must be provided by
65  * the users.
66  *
67  * @since 1.2
68  * @author Andrus Adamchik
69  */

70 public class OperationRecorder implements GraphChangeHandler {
71
72     protected List JavaDoc diffs;
73
74     public OperationRecorder() {
75         this.diffs = new ArrayList JavaDoc();
76     }
77
78     /**
79      * Returns a combined GraphDiff for all recorded operations.
80      */

81     public GraphDiff getDiffs() {
82         return new CompoundDiff(Collections.unmodifiableList(diffs));
83     }
84
85     public void clear() {
86         this.diffs = new ArrayList JavaDoc();
87     }
88     
89     public int size() {
90         return diffs.size();
91     }
92
93     public boolean isEmpty() {
94         return diffs.isEmpty();
95     }
96
97     public void nodeCreated(Object JavaDoc nodeId) {
98         diffs.add(new NodeCreateOperation(nodeId));
99     }
100
101     public void nodeIdChanged(Object JavaDoc nodeId, Object JavaDoc newId) {
102         diffs.add(new NodeIdChangeOperation(nodeId, newId));
103     }
104
105     public void nodeRemoved(Object JavaDoc nodeId) {
106         diffs.add(new NodeDeleteOperation(nodeId));
107     }
108
109     public void nodePropertyChanged(
110             Object JavaDoc nodeId,
111             String JavaDoc property,
112             Object JavaDoc oldValue,
113             Object JavaDoc newValue) {
114         diffs.add(new NodePropertyChangeOperation(nodeId, property, oldValue, newValue));
115     }
116
117     public void arcCreated(Object JavaDoc nodeId, Object JavaDoc targetNodeId, Object JavaDoc arcId) {
118         diffs.add(new ArcCreateOperation(nodeId, targetNodeId, arcId));
119     }
120
121     public void arcDeleted(Object JavaDoc nodeId, Object JavaDoc targetNodeId, Object JavaDoc arcId) {
122         diffs.add(new ArcDeleteOperation(nodeId, targetNodeId, arcId));
123     }
124 }
125
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