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56 package org.objectstyle.cayenne.graph;
57
58 import java.util.ArrayList  ;
59 import java.util.Collection ;
60 import java.util.HashMap ;
61 import java.util.Iterator ;
62 import java.util.Map ;
63
64
73 public class GraphManager implements GraphMap, GraphChangeHandler {
74
75 protected Map nodes;
76
77 protected Collection localChangeHandlers;
78 protected GraphChangeHandler remoteChangeHandler;
79 protected boolean recordingLocalChanges;
80
81
84 public GraphManager() {
85 this.nodes = new HashMap ();
86 this.recordingLocalChanges = true;
87 }
88
89
92 public synchronized void mergeRemoteChange(GraphDiff change) {
93 if (remoteChangeHandler == null) {
94 return;
95 }
96
97 setRecordingLocalChanges(false);
99
100 try {
101 change.apply(remoteChangeHandler);
102 }
103 finally {
104 setRecordingLocalChanges(true);
105 }
106 }
107
108 public boolean isRecordingLocalChanges() {
109 return recordingLocalChanges;
110 }
111
112 public void setRecordingLocalChanges(boolean active) {
113 this.recordingLocalChanges = active;
114 }
115
116 public synchronized void addLocalChangeHandler(GraphChangeHandler handler) {
117 if (handler != null) {
118 if (localChangeHandlers == null) {
119 localChangeHandlers = new ArrayList ();
120 }
121
122 localChangeHandlers.add(handler);
123 }
124 }
125
126 public synchronized void removeLocalChangeHandler(GraphChangeHandler handler) {
127 if (handler != null && localChangeHandlers != null) {
128 localChangeHandlers.remove(handler);
129
130 if (localChangeHandlers.isEmpty()) {
131 localChangeHandlers = null;
132 }
133 }
134 }
135
136 public GraphChangeHandler getRemoteChangeHandler() {
137 return remoteChangeHandler;
138 }
139
140 public void setRemoteChangeHandler(GraphChangeHandler handler) {
141 this.remoteChangeHandler = handler;
142 }
143
144 protected Collection getLocalChangeHandlers() {
145 return localChangeHandlers;
146 }
147
148
150 public synchronized Object getNode(Object nodeId) {
151 return nodes.get(nodeId);
152 }
153
154 public synchronized void registerNode(Object nodeId, Object nodeObject) {
155 nodes.put(nodeId, nodeObject);
156 }
157
158 public synchronized Object unregisterNode(Object nodeId) {
159 return nodes.remove(nodeId);
160 }
161
162
164 public synchronized void arcCreated(Object nodeId, Object targetNodeId, Object arcId) {
165 if (recordingLocalChanges && localChangeHandlers != null) {
166 Iterator it = localChangeHandlers.iterator();
167 while (it.hasNext()) {
168 ((GraphChangeHandler) it.next()).arcCreated(nodeId, targetNodeId, arcId);
169 }
170 }
171 }
172
173 public synchronized void arcDeleted(Object nodeId, Object targetNodeId, Object arcId) {
174 if (recordingLocalChanges && localChangeHandlers != null) {
175 Iterator it = localChangeHandlers.iterator();
176 while (it.hasNext()) {
177 ((GraphChangeHandler) it.next()).arcDeleted(nodeId, targetNodeId, arcId);
178 }
179 }
180 }
181
182 public synchronized void nodeCreated(Object nodeId) {
183 if (recordingLocalChanges && localChangeHandlers != null) {
184 Iterator it = localChangeHandlers.iterator();
185 while (it.hasNext()) {
186 ((GraphChangeHandler) it.next()).nodeCreated(nodeId);
187 }
188 }
189 }
190
191 public synchronized void nodeRemoved(Object nodeId) {
192 if (recordingLocalChanges && localChangeHandlers != null) {
193 Iterator it = localChangeHandlers.iterator();
194 while (it.hasNext()) {
195 ((GraphChangeHandler) it.next()).nodeRemoved(nodeId);
196 }
197 }
198 }
199
200 public synchronized void nodeIdChanged(Object nodeId, Object newId) {
201 if (recordingLocalChanges && localChangeHandlers != null) {
202 Iterator it = localChangeHandlers.iterator();
203 while (it.hasNext()) {
204 ((GraphChangeHandler) it.next()).nodeIdChanged(nodeId, newId);
205 }
206 }
207 }
208
209 public synchronized void nodePropertyChanged(
210 Object nodeId,
211 String property,
212 Object oldValue,
213 Object newValue) {
214 if (recordingLocalChanges && localChangeHandlers != null) {
215 Iterator it = localChangeHandlers.iterator();
216 while (it.hasNext()) {
217 ((GraphChangeHandler) it.next()).nodePropertyChanged(
218 nodeId,
219 property,
220 oldValue,
221 newValue);
222 }
223 }
224 }
225 }
226 |
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