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Cayenne Object Persistence Framework
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
****************************************************************/
package org.apache.cayenne.graph;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* A base implementation of GraphManager that stores graph nodes keyed by their ids.
* Tracking Object Changes
*
* Registered objects may choose to notify GraphMap of their changes by using callback
* methods defined in GraphChangeHandler interface. GraphMap itself implements as noops,
* leaving it up to subclasses to handle object updates.
*
*
* @since 1.2
* @author Andrus Adamchik
*/
public class GraphMap implements GraphManager {
protected Map nodes;
/**
* Creates a new GraphMap.
*/
public GraphMap() {
this.nodes = new HashMap();
}
// *** GraphMap methods
/**
* Returns an immutable collection of registered nodes.
*/
public Collection registeredNodes() {
return Collections.unmodifiableCollection(nodes.values());
}
public synchronized Object getNode(Object nodeId) {
return nodes.get(nodeId);
}
public synchronized void registerNode(Object nodeId, Object nodeObject) {
nodes.put(nodeId, nodeObject);
}
public synchronized Object unregisterNode(Object nodeId) {
return nodes.remove(nodeId);
}
// *** methods for tracking local changes declared in GraphChangeHandler interface
public void arcCreated(Object nodeId, Object targetNodeId, Object arcId) {
// noop
}
public void arcDeleted(Object nodeId, Object targetNodeId, Object arcId) {
// noop
}
public void nodeCreated(Object nodeId) {
// noop
}
public void nodeRemoved(Object nodeId) {
// noop
}
public void nodeIdChanged(Object nodeId, Object newId) {
// noop
}
public void nodePropertyChanged(
Object nodeId,
String property,
Object oldValue,
Object newValue) {
// noop
}
}
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