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/*******************************************************************************
* Copyright (c) 2005, 2006 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 164653
* Brad Reynolds - bug 147515
*******************************************************************************/
package org.eclipse.core.internal.databinding.observable.masterdetail;
import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
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 1.0
*
*/
public class DetailObservableValue extends AbstractObservableValue {
private boolean updating = false;
private IValueChangeListener innerChangeListener = new IValueChangeListener() {
public void handleValueChange(ValueChangeEvent event) {
if (!updating) {
fireValueChange(event.diff);
}
}
};
private Object currentOuterValue;
private IObservableValue innerObservableValue;
private Object detailType;
private IObservableValue outerObservableValue;
private IObservableFactory factory;
/**
* @param outerObservableValue
* @param factory
* @param detailType
* @param realm
*/
public DetailObservableValue(IObservableValue outerObservableValue,
IObservableFactory factory, Object detailType) {
super(outerObservableValue.getRealm());
this.factory = factory;
this.detailType = detailType;
this.outerObservableValue = outerObservableValue;
updateInnerObservableValue(outerObservableValue);
outerObservableValue.addValueChangeListener(outerChangeListener);
}
IValueChangeListener outerChangeListener = new IValueChangeListener() {
public void handleValueChange(ValueChangeEvent event) {
Object oldValue = doGetValue();
updateInnerObservableValue(outerObservableValue);
fireValueChange(Diffs.createValueDiff(oldValue, doGetValue()));
}
};
private void updateInnerObservableValue(
IObservableValue outerObservableValue) {
currentOuterValue = outerObservableValue.getValue();
if (innerObservableValue != null) {
innerObservableValue.removeValueChangeListener(innerChangeListener);
innerObservableValue.dispose();
}
if (currentOuterValue == null) {
innerObservableValue = null;
} else {
this.innerObservableValue = (IObservableValue) factory
.createObservable(currentOuterValue);
Object innerValueType = innerObservableValue.getValueType();
if (detailType != null) {
Assert
.isTrue(detailType.equals(innerValueType),
"Cannot change value type in a nested observable value"); //$NON-NLS-1$
}
innerObservableValue.addValueChangeListener(innerChangeListener);
}
}
public void doSetValue(Object value) {
if (innerObservableValue != null)
innerObservableValue.setValue(value);
}
public Object doGetValue() {
return innerObservableValue == null ? null : innerObservableValue
.getValue();
}
public Object getValueType() {
return detailType;
}
public void dispose() {
super.dispose();
if (outerObservableValue != null) {
outerObservableValue.removeValueChangeListener(outerChangeListener);
outerObservableValue.dispose();
}
if (innerObservableValue != null) {
innerObservableValue.removeValueChangeListener(innerChangeListener);
innerObservableValue.dispose();
}
currentOuterValue = null;
factory = null;
innerObservableValue = null;
innerChangeListener = null;
}
}
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