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/*****************************************************************************
* Copyright (c) 2012, 2014 CEA LIST 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
* Christian W. Damus (CEA) - 402525
*
*****************************************************************************/
package org.eclipse.papyrus.infra.gmfdiag.common.databinding.custom;
import org.eclipse.core.databinding.observable.ChangeEvent;
import org.eclipse.core.databinding.observable.IChangeListener;
import org.eclipse.core.databinding.observable.IObserving;
import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
import org.eclipse.core.databinding.observable.value.ValueDiff;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.gmf.runtime.notation.NamedStyle;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.papyrus.infra.gmfdiag.common.listener.CustomStyleListener;
import org.eclipse.papyrus.infra.tools.databinding.CommandBasedObservableValue;
/**
* Abstract implementation for an ObservableValue associated to a GMF custom
* style (NamedStyle).
*
* @author Camille Letavernier
*
*/
public abstract class AbstractCustomStyleObservableValue extends AbstractObservableValue implements CommandBasedObservableValue, IChangeListener, IObserving {
protected View source;
protected EditingDomain domain;
protected String styleName;
protected Object lastValue;
protected CustomStyleListener listener;
protected EClass styleClass;
protected EStructuralFeature styleFeature;
public AbstractCustomStyleObservableValue(View source, EditingDomain domain, String styleName, EClass styleClass, EStructuralFeature styleFeature) {
this.source = source;
this.domain = domain;
this.styleName = styleName;
this.styleClass = styleClass;
this.styleFeature = styleFeature;
source.eAdapters().add(listener = new CustomStyleListener(source, styleFeature, this, styleName));
}
@Override
public void handleChange(ChangeEvent event) {
final Object oldValue = lastValue;
final Object newValue = doGetValue();
fireValueChange(new ValueDiff() {
@Override
public Object getOldValue() {
return oldValue;
}
@Override
public Object getNewValue() {
return newValue;
}
});
}
@Override
protected Object doGetValue() {
NamedStyle valueStyle = source.getNamedStyle(styleClass, styleName);
if (valueStyle != null) {
lastValue = valueStyle.eGet(styleFeature);
} else {
lastValue = getDefaultValue();
}
return lastValue;
}
/**
* Gets the default value when this style is not set.
*
* @return The default value for this NamedStyle
*/
protected abstract Object getDefaultValue();
@Override
protected void doSetValue(Object value) {
Command command = getCommand(value);
domain.getCommandStack().execute(command);
doGetValue(); // Refresh the lastValue
}
@Override
public Command getCommand(Object value) {
return new CustomStyleValueCommand(source, value, styleClass, styleFeature, styleName);
}
@Override
public Object getObserved() {
return source;
}
@Override
public void dispose() {
if (isDisposed()) {
return;
}
if (listener != null) {
source.eAdapters().remove(listener);
listener.dispose();
listener = null;
}
super.dispose();
}
}
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