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1
56 package org.objectstyle.cayenne.graph;
57
58 import java.util.ArrayList  ;
59 import java.util.Collections ;
60 import java.util.List ;
61
62
70 public class OperationRecorder implements GraphChangeHandler {
71
72 protected List diffs;
73
74 public OperationRecorder() {
75 this.diffs = new ArrayList ();
76 }
77
78
81 public GraphDiff getDiffs() {
82 return new CompoundDiff(Collections.unmodifiableList(diffs));
83 }
84
85 public void clear() {
86 this.diffs = new ArrayList ();
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 nodeId) {
98 diffs.add(new NodeCreateOperation(nodeId));
99 }
100
101 public void nodeIdChanged(Object nodeId, Object newId) {
102 diffs.add(new NodeIdChangeOperation(nodeId, newId));
103 }
104
105 public void nodeRemoved(Object nodeId) {
106 diffs.add(new NodeDeleteOperation(nodeId));
107 }
108
109 public void nodePropertyChanged(
110 Object nodeId,
111 String property,
112 Object oldValue,
113 Object newValue) {
114 diffs.add(new NodePropertyChangeOperation(nodeId, property, oldValue, newValue));
115 }
116
117 public void arcCreated(Object nodeId, Object targetNodeId, Object arcId) {
118 diffs.add(new ArcCreateOperation(nodeId, targetNodeId, arcId));
119 }
120
121 public void arcDeleted(Object nodeId, Object targetNodeId, Object arcId) {
122 diffs.add(new ArcDeleteOperation(nodeId, targetNodeId, arcId));
123 }
124 }
125 |
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