/*******************************************************************************
* Copyright (c) 2005, 2009 IBM Corporation 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:
* IBM Corporation - initial API and implementation
* Matthew Hall - bug 221351, 247875, 246782, 249526, 268022, 251424
* Ovidio Mallo - bug 241318
*******************************************************************************/
package org.eclipse.core.internal.databinding.observable.masterdetail;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.DisposeEvent;
import org.eclipse.core.databinding.observable.IDisposeListener;
import org.eclipse.core.databinding.observable.IObserving;
import org.eclipse.core.databinding.observable.ObservableTracker;
import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
import org.eclipse.core.databinding.observable.set.IObservableSet;
import org.eclipse.core.databinding.observable.set.ISetChangeListener;
import org.eclipse.core.databinding.observable.set.ObservableSet;
import org.eclipse.core.databinding.observable.set.SetChangeEvent;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.IValueChangeListener;
import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
import org.eclipse.core.runtime.Assert;
/**
* @since 3.2
*
*/
public class DetailObservableSet extends ObservableSet implements IObserving {
private boolean updating = false;
private ISetChangeListener innerChangeListener = new ISetChangeListener() {
public void handleSetChange(SetChangeEvent event) {
if (!updating) {
fireSetChange(event.diff);
}
}
};
private Object currentOuterValue;
private IObservableSet innerObservableSet;
private IObservableValue outerObservableValue;
private IObservableFactory factory;
/**
* @param factory
* @param outerObservableValue
* @param detailType
*/
public DetailObservableSet(IObservableFactory factory,
IObservableValue outerObservableValue, Object detailType) {
super(outerObservableValue.getRealm(), Collections.EMPTY_SET,
detailType);
Assert.isTrue(!outerObservableValue.isDisposed(),
"Master observable is disposed"); //$NON-NLS-1$
this.factory = factory;
this.outerObservableValue = outerObservableValue;
outerObservableValue.addDisposeListener(new IDisposeListener() {
public void handleDispose(DisposeEvent staleEvent) {
dispose();
}
});
ObservableTracker.setIgnore(true);
try {
updateInnerObservableSet();
} finally {
ObservableTracker.setIgnore(false);
}
outerObservableValue.addValueChangeListener(outerChangeListener);
}
IValueChangeListener outerChangeListener = new IValueChangeListener() {
public void handleValueChange(ValueChangeEvent event) {
if (isDisposed())
return;
ObservableTracker.setIgnore(true);
try {
Set oldSet = new HashSet(wrappedSet);
updateInnerObservableSet();
fireSetChange(Diffs.computeSetDiff(oldSet, wrappedSet));
} finally {
ObservableTracker.setIgnore(false);
}
}
};
private void updateInnerObservableSet() {
currentOuterValue = outerObservableValue.getValue();
if (innerObservableSet != null) {
innerObservableSet.removeSetChangeListener(innerChangeListener);
innerObservableSet.dispose();
}
if (currentOuterValue == null) {
innerObservableSet = null;
wrappedSet = Collections.EMPTY_SET;
} else {
ObservableTracker.setIgnore(true);
try {
innerObservableSet = (IObservableSet) factory
.createObservable(currentOuterValue);
} finally {
ObservableTracker.setIgnore(false);
}
DetailObservableHelper.warnIfDifferentRealms(getRealm(),
innerObservableSet.getRealm());
wrappedSet = innerObservableSet;
if (elementType != null) {
Object innerValueType = innerObservableSet.getElementType();
Assert.isTrue(elementType.equals(innerValueType),
"Cannot change value type in a nested observable set"); //$NON-NLS-1$
}
innerObservableSet.addSetChangeListener(innerChangeListener);
}
}
public boolean add(final Object o) {
getterCalled();
ObservableTracker.setIgnore(true);
try {
return wrappedSet.add(o);
} finally {
ObservableTracker.setIgnore(false);
}
}
public boolean remove(final Object o) {
getterCalled();
ObservableTracker.setIgnore(true);
try {
return wrappedSet.remove(o);
} finally {
ObservableTracker.setIgnore(false);
}
}
public boolean addAll(final Collection c) {
getterCalled();
ObservableTracker.setIgnore(true);
try {
return wrappedSet.addAll(c);
} finally {
ObservableTracker.setIgnore(false);
}
}
public boolean removeAll(final Collection c) {
getterCalled();
ObservableTracker.setIgnore(true);
try {
return wrappedSet.removeAll(c);
} finally {
ObservableTracker.setIgnore(false);
}
}
public boolean retainAll(final Collection c) {
getterCalled();
ObservableTracker.setIgnore(true);
try {
return wrappedSet.retainAll(c);
} finally {
ObservableTracker.setIgnore(false);
}
}
public void clear() {
getterCalled();
ObservableTracker.setIgnore(true);
try {
wrappedSet.clear();
} finally {
ObservableTracker.setIgnore(false);
}
}
public synchronized void dispose() {
super.dispose();
if (outerObservableValue != null) {
outerObservableValue.removeValueChangeListener(outerChangeListener);
}
if (innerObservableSet != null) {
innerObservableSet.removeSetChangeListener(innerChangeListener);
innerObservableSet.dispose();
}
outerObservableValue = null;
outerChangeListener = null;
currentOuterValue = null;
factory = null;
innerObservableSet = null;
innerChangeListener = null;
}
public Object getObserved() {
if (innerObservableSet instanceof IObserving) {
return ((IObserving) innerObservableSet).getObserved();
}
return null;
}
}