/*******************************************************************************
* 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
* Brad Reynolds - bug 147515
* Matthew Hall - bug 221351, 247875, 246782, 249526, 268022, 251424
* Ovidio Mallo - bug 241318
*******************************************************************************/
package org.eclipse.core.internal.databinding.observable.masterdetail;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
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.list.IListChangeListener;
import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.core.databinding.observable.list.ListChangeEvent;
import org.eclipse.core.databinding.observable.list.ObservableList;
import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
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 DetailObservableList extends ObservableList implements IObserving {
private boolean updating = false;
private IListChangeListener innerChangeListener = new IListChangeListener() {
public void handleListChange(ListChangeEvent event) {
if (!updating) {
fireListChange(event.diff);
}
}
};
private Object currentOuterValue;
private IObservableList innerObservableList;
private IObservableFactory factory;
private IObservableValue outerObservableValue;
private Object detailType;
/**
* @param factory
* @param outerObservableValue
* @param detailType
*/
public DetailObservableList(IObservableFactory factory,
IObservableValue outerObservableValue, Object detailType) {
super(outerObservableValue.getRealm(), Collections.EMPTY_LIST,
detailType);
Assert.isTrue(!outerObservableValue.isDisposed(),
"Master observable is disposed"); //$NON-NLS-1$
this.factory = factory;
this.outerObservableValue = outerObservableValue;
this.detailType = detailType;
outerObservableValue.addDisposeListener(new IDisposeListener() {
public void handleDispose(DisposeEvent staleEvent) {
dispose();
}
});
ObservableTracker.setIgnore(true);
try {
updateInnerObservableList();
} finally {
ObservableTracker.setIgnore(false);
}
outerObservableValue.addValueChangeListener(outerChangeListener);
}
IValueChangeListener outerChangeListener = new IValueChangeListener() {
public void handleValueChange(ValueChangeEvent event) {
if (isDisposed())
return;
ObservableTracker.setIgnore(true);
try {
List oldList = new ArrayList(wrappedList);
updateInnerObservableList();
fireListChange(Diffs.computeListDiff(oldList, wrappedList));
} finally {
ObservableTracker.setIgnore(false);
}
}
};
private void updateInnerObservableList() {
if (innerObservableList != null) {
innerObservableList.removeListChangeListener(innerChangeListener);
innerObservableList.dispose();
}
currentOuterValue = outerObservableValue.getValue();
if (currentOuterValue == null) {
innerObservableList = null;
wrappedList = Collections.EMPTY_LIST;
} else {
ObservableTracker.setIgnore(true);
try {
innerObservableList = (IObservableList) factory
.createObservable(currentOuterValue);
} finally {
ObservableTracker.setIgnore(false);
}
DetailObservableHelper.warnIfDifferentRealms(getRealm(),
innerObservableList.getRealm());
wrappedList = innerObservableList;
if (detailType != null) {
Object innerValueType = innerObservableList.getElementType();
Assert.isTrue(getElementType().equals(innerValueType),
"Cannot change value type in a nested observable list"); //$NON-NLS-1$
}
innerObservableList.addListChangeListener(innerChangeListener);
}
}
public boolean add(final Object o) {
ObservableTracker.setIgnore(true);
try {
return wrappedList.add(o);
} finally {
ObservableTracker.setIgnore(false);
}
}
public void add(final int index, final Object element) {
ObservableTracker.setIgnore(true);
try {
wrappedList.add(index, element);
} finally {
ObservableTracker.setIgnore(false);
}
}
public boolean remove(final Object o) {
ObservableTracker.setIgnore(true);
try {
return wrappedList.remove(o);
} finally {
ObservableTracker.setIgnore(false);
}
}
public Object set(final int index, final Object element) {
ObservableTracker.setIgnore(true);
try {
return wrappedList.set(index, element);
} finally {
ObservableTracker.setIgnore(false);
}
}
public Object move(final int oldIndex, final int newIndex) {
if (innerObservableList != null) {
ObservableTracker.setIgnore(true);
try {
return innerObservableList.move(oldIndex, newIndex);
} finally {
ObservableTracker.setIgnore(false);
}
}
return super.move(oldIndex, newIndex);
}
public Object remove(final int index) {
ObservableTracker.setIgnore(true);
try {
return wrappedList.remove(index);
} finally {
ObservableTracker.setIgnore(false);
}
}
public boolean addAll(final Collection c) {
ObservableTracker.setIgnore(true);
try {
return wrappedList.addAll(c);
} finally {
ObservableTracker.setIgnore(false);
}
}
public boolean addAll(final int index, final Collection c) {
ObservableTracker.setIgnore(true);
try {
return wrappedList.addAll(index, c);
} finally {
ObservableTracker.setIgnore(false);
}
}
public boolean removeAll(final Collection c) {
ObservableTracker.setIgnore(true);
try {
return wrappedList.removeAll(c);
} finally {
ObservableTracker.setIgnore(false);
}
}
public boolean retainAll(final Collection c) {
ObservableTracker.setIgnore(true);
try {
return wrappedList.retainAll(c);
} finally {
ObservableTracker.setIgnore(false);
}
}
public void clear() {
ObservableTracker.setIgnore(true);
try {
wrappedList.clear();
} finally {
ObservableTracker.setIgnore(false);
}
}
public synchronized void dispose() {
super.dispose();
if (outerObservableValue != null) {
outerObservableValue.removeValueChangeListener(outerChangeListener);
}
if (innerObservableList != null) {
innerObservableList.removeListChangeListener(innerChangeListener);
innerObservableList.dispose();
}
outerObservableValue = null;
outerChangeListener = null;
currentOuterValue = null;
factory = null;
innerObservableList = null;
innerChangeListener = null;
}
public Object getObserved() {
if (innerObservableList instanceof IObserving) {
return ((IObserving) innerObservableList).getObserved();
}
return null;
}
}