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/*******************************************************************************
* Copyright (c) 2006, 2010 Soyatec (http://www.soyatec.com) 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:
* Soyatec - initial API and implementation
*******************************************************************************/
package org.eclipse.papyrus.xwt.core;
import java.util.HashMap;
import org.eclipse.core.databinding.observable.ChangeEvent;
import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.papyrus.xwt.XWTException;
import org.eclipse.papyrus.xwt.internal.core.ScopeManager;
import org.eclipse.papyrus.xwt.internal.core.UpdateSourceTrigger;
public class MultiTrigger extends TriggerBase {
private Condition[] conditions = Condition.EMPTY_ARRAY;
private SetterBase[] setters;
public Condition[] getConditions() {
return conditions;
}
public void setConditions(Condition[] conditions) {
this.conditions = conditions;
}
public SetterBase[] getSetters() {
return setters;
}
public void setSetters(SetterBase[] setters) {
this.setters = setters;
}
class ValueChangeListener extends AbstractChangeListener {
public ValueChangeListener(Object element) {
super(element);
}
public void handleChange(ChangeEvent event) {
for(Condition condition : getConditions()) {
if(!condition.evaluate(element)) {
restoreValues();
return;
}
}
if(oldvalues != null && !oldvalues.isEmpty()) {
return;
}
for(SetterBase setter : getSetters()) {
try {
Object oldValue = setter.applyTo(element, true);
if(oldvalues == null) {
oldvalues = new HashMap<SetterBase, Object>();
}
oldvalues.put(setter, oldValue);
} catch (RuntimeException e) {
continue;
}
}
}
}
@Override
public void on(Object target) {
}
@Override
public void prepare(Object target) {
if(getConditions().length == 0) {
return;
}
ValueChangeListener changeListener = new ValueChangeListener(target);
for(Condition condition : getConditions()) {
String propertyName = condition.getProperty();
String sourceName = condition.getSourceName();
Object source = getElementByName(target, sourceName);
if(source == null) {
throw new XWTException("No element is found with the name = " + sourceName);
}
IObservable observableValue = ScopeManager.observeValue(source, source, propertyName, UpdateSourceTrigger.PropertyChanged);
observableValue.addChangeListener(changeListener);
}
}
}
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