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/*******************************************************************************
* Copyright (c) 2008, 2009 Matthew Hall and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Matthew Hall - initial API and implementation (bug 194734)
* Matthew Hall - bugs 262269, 266754, 265561, 262287, 268688
******************************************************************************/
package org.eclipse.core.internal.databinding.property.value;
import java.util.Map;
import java.util.Set;
import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.map.ComputedObservableMap;
import org.eclipse.core.databinding.observable.set.IObservableSet;
import org.eclipse.core.databinding.property.INativePropertyListener;
import org.eclipse.core.databinding.property.IProperty;
import org.eclipse.core.databinding.property.IPropertyObservable;
import org.eclipse.core.databinding.property.ISimplePropertyListener;
import org.eclipse.core.databinding.property.SimplePropertyEvent;
import org.eclipse.core.databinding.property.value.SimpleValueProperty;
import org.eclipse.core.internal.databinding.identity.IdentityMap;
import org.eclipse.core.internal.databinding.identity.IdentitySet;
import org.eclipse.core.internal.databinding.property.Util;
/**
* @since 1.2
*/
public class SetSimpleValueObservableMap extends ComputedObservableMap
implements IPropertyObservable {
private SimpleValueProperty detailProperty;
private INativePropertyListener listener;
private Map cachedValues;
private Set staleKeys;
private boolean updating;
/**
* @param keySet
* @param valueProperty
*/
public SetSimpleValueObservableMap(IObservableSet keySet,
SimpleValueProperty valueProperty) {
super(keySet);
this.detailProperty = valueProperty;
}
protected void firstListenerAdded() {
if (listener == null) {
listener = detailProperty
.adaptListener(new ISimplePropertyListener() {
public void handleEvent(final SimplePropertyEvent event) {
if (!isDisposed() && !updating) {
getRealm().exec(new Runnable() {
public void run() {
if (event.type == SimplePropertyEvent.CHANGE) {
notifyIfChanged(event.getSource());
} else if (event.type == SimplePropertyEvent.STALE) {
boolean wasStale = !staleKeys
.isEmpty();
staleKeys.add(event.getSource());
if (!wasStale)
fireStale();
}
}
});
}
}
});
}
cachedValues = new IdentityMap();
staleKeys = new IdentitySet();
super.firstListenerAdded();
}
protected void lastListenerRemoved() {
super.lastListenerRemoved();
cachedValues.clear();
cachedValues = null;
staleKeys.clear();
staleKeys = null;
}
protected void hookListener(Object addedKey) {
if (cachedValues != null) {
cachedValues.put(addedKey, detailProperty.getValue(addedKey));
if (listener != null)
listener.addTo(addedKey);
}
}
protected void unhookListener(Object removedKey) {
if (cachedValues != null) {
if (listener != null)
listener.removeFrom(removedKey);
cachedValues.remove(removedKey);
staleKeys.remove(removedKey);
}
}
protected Object doGet(Object key) {
return detailProperty.getValue(key);
}
protected Object doPut(Object key, Object value) {
Object oldValue = detailProperty.getValue(key);
updating = true;
try {
detailProperty.setValue(key, value);
} finally {
updating = false;
}
notifyIfChanged(key);
return oldValue;
}
private void notifyIfChanged(Object key) {
if (cachedValues != null) {
Object oldValue = cachedValues.get(key);
Object newValue = detailProperty.getValue(key);
if (!Util.equals(oldValue, newValue) || staleKeys.contains(key)) {
cachedValues.put(key, newValue);
staleKeys.remove(key);
fireMapChange(Diffs.createMapDiffSingleChange(key, oldValue,
newValue));
}
}
}
public Object getObserved() {
return keySet();
}
public IProperty getProperty() {
return detailProperty;
}
public boolean isStale() {
return super.isStale() || staleKeys != null && !staleKeys.isEmpty();
}
public synchronized void dispose() {
if (cachedValues != null) {
cachedValues.clear();
cachedValues = null;
}
listener = null;
detailProperty = null;
cachedValues = null;
staleKeys = null;
super.dispose();
}
}
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