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/*******************************************************************************
* Copyright (c) 2008 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 124684)
* IBM Corporation - through ListBinding.java
* Matthew Hall - bug 271148
******************************************************************************/
package org.eclipse.core.databinding;
import java.util.Collections;
import java.util.Iterator;
import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.set.IObservableSet;
import org.eclipse.core.databinding.observable.set.ISetChangeListener;
import org.eclipse.core.databinding.observable.set.SetChangeEvent;
import org.eclipse.core.databinding.observable.set.SetDiff;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.WritableValue;
import org.eclipse.core.internal.databinding.BindingStatus;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.MultiStatus;
import org.eclipse.core.runtime.Status;
/**
* @since 1.1
*
*/
public class SetBinding extends Binding {
private UpdateSetStrategy targetToModel;
private UpdateSetStrategy modelToTarget;
private IObservableValue validationStatusObservable;
private boolean updatingTarget;
private boolean updatingModel;
private ISetChangeListener targetChangeListener = new ISetChangeListener() {
public void handleSetChange(SetChangeEvent event) {
if (!updatingTarget) {
doUpdate((IObservableSet) getTarget(),
(IObservableSet) getModel(), event.diff, targetToModel,
false, false);
}
}
};
private ISetChangeListener modelChangeListener = new ISetChangeListener() {
public void handleSetChange(SetChangeEvent event) {
if (!updatingModel) {
doUpdate((IObservableSet) getModel(),
(IObservableSet) getTarget(), event.diff,
modelToTarget, false, false);
}
}
};
/**
* @param target
* @param model
* @param modelToTargetStrategy
* @param targetToModelStrategy
*/
public SetBinding(IObservableSet target, IObservableSet model,
UpdateSetStrategy targetToModelStrategy,
UpdateSetStrategy modelToTargetStrategy) {
super(target, model);
this.targetToModel = targetToModelStrategy;
this.modelToTarget = modelToTargetStrategy;
if ((targetToModel.getUpdatePolicy() & UpdateSetStrategy.POLICY_UPDATE) != 0) {
target.addSetChangeListener(targetChangeListener);
} else {
targetChangeListener = null;
}
if ((modelToTarget.getUpdatePolicy() & UpdateSetStrategy.POLICY_UPDATE) != 0) {
model.addSetChangeListener(modelChangeListener);
} else {
modelChangeListener = null;
}
}
public IObservableValue getValidationStatus() {
return validationStatusObservable;
}
protected void preInit() {
validationStatusObservable = new WritableValue(context
.getValidationRealm(), Status.OK_STATUS, IStatus.class);
}
protected void postInit() {
if (modelToTarget.getUpdatePolicy() == UpdateSetStrategy.POLICY_UPDATE) {
updateModelToTarget();
}
if (targetToModel.getUpdatePolicy() == UpdateSetStrategy.POLICY_UPDATE) {
validateTargetToModel();
}
}
public void updateModelToTarget() {
final IObservableSet modelSet = (IObservableSet) getModel();
modelSet.getRealm().exec(new Runnable() {
public void run() {
SetDiff diff = Diffs.computeSetDiff(Collections.EMPTY_SET,
modelSet);
doUpdate(modelSet, (IObservableSet) getTarget(), diff,
modelToTarget, true, true);
}
});
}
public void updateTargetToModel() {
final IObservableSet targetSet = (IObservableSet) getTarget();
targetSet.getRealm().exec(new Runnable() {
public void run() {
SetDiff diff = Diffs.computeSetDiff(Collections.EMPTY_SET,
targetSet);
doUpdate(targetSet, (IObservableSet) getModel(), diff,
targetToModel, true, true);
}
});
}
public void validateModelToTarget() {
// nothing for now
}
public void validateTargetToModel() {
// nothing for now
}
/*
* This method may be moved to UpdateSetStrategy in the future if clients
* need more control over how the two sets are kept in sync.
*/
private void doUpdate(final IObservableSet source,
final IObservableSet destination, final SetDiff diff,
final UpdateSetStrategy updateSetStrategy, final boolean explicit,
final boolean clearDestination) {
final int policy = updateSetStrategy.getUpdatePolicy();
if (policy == UpdateSetStrategy.POLICY_NEVER)
return;
if (policy == UpdateSetStrategy.POLICY_ON_REQUEST && !explicit)
return;
destination.getRealm().exec(new Runnable() {
public void run() {
if (destination == getTarget()) {
updatingTarget = true;
} else {
updatingModel = true;
}
MultiStatus multiStatus = BindingStatus.ok();
try {
if (clearDestination) {
destination.clear();
}
for (Iterator iterator = diff.getRemovals().iterator(); iterator
.hasNext();) {
IStatus setterStatus = updateSetStrategy.doRemove(
destination, updateSetStrategy.convert(iterator
.next()));
mergeStatus(multiStatus, setterStatus);
// TODO - at this point, the two sets
// will be out of sync if an error
// occurred...
}
for (Iterator iterator = diff.getAdditions().iterator(); iterator
.hasNext();) {
IStatus setterStatus = updateSetStrategy.doAdd(
destination, updateSetStrategy.convert(iterator
.next()));
mergeStatus(multiStatus, setterStatus);
// TODO - at this point, the two sets
// will be out of sync if an error
// occurred...
}
} finally {
validationStatusObservable.setValue(multiStatus);
if (destination == getTarget()) {
updatingTarget = false;
} else {
updatingModel = false;
}
}
}
});
}
/**
* Merges the provided <code>newStatus</code> into the
* <code>multiStatus</code>.
*
* @param multiStatus
* @param newStatus
*/
/* package */void mergeStatus(MultiStatus multiStatus, IStatus newStatus) {
if (!newStatus.isOK()) {
multiStatus.add(newStatus);
}
}
public void dispose() {
if (targetChangeListener != null) {
((IObservableSet) getTarget())
.removeSetChangeListener(targetChangeListener);
targetChangeListener = null;
}
if (modelChangeListener != null) {
((IObservableSet) getModel())
.removeSetChangeListener(modelChangeListener);
modelChangeListener = null;
}
super.dispose();
}
}
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