bundles/common/org.eclipse.apogy.common.emf/src/org/eclipse/apogy/common/emf/EListAdapter.java

/*******************************************************************************
 * Copyright (c) 2018 Agence spatiale canadienne / Canadian Space Agency
 * 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:
<<<<<<< HEAD
 *     Pierre Allard - initial API and implementation
 *     Regent L'Archeveque
 * 
=======
 *     Pierre Allard, 
 *     Regent L'Archeveque,
 *     Olivier L. Larouche - initial API and implementation
>>>>>>> refs/heads/eclipse_pa
 * SPDX-License-Identifier: EPL-1.0
 *     
 *******************************************************************************/
package org.eclipse.apogy.common.emf;

import java.util.List;

import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.Notifier;

public class EListAdapter<T> implements Adapter {

	private final ListEventDelegate<T> delegate;
	private final int expectedFeatureId;
	private final Class<?> expectedClass;

	/**
	 * Creates a new instance.
	 * 
	 * @param expectedFeatureId the feature id we want to listen to.
	 * @param delegate          the delegate beeing used to delegate the events.
	 * @param expectedClass     the class we are listening.
	 * 
	 * @throws IllegalArgumentException if delegate or expectedClass is null.
	 */
	public EListAdapter(int expectedFeatureId, ListEventDelegate<T> delegate, Class<?> expectedClass) {
		if (delegate == null) {
			throw new IllegalArgumentException("delegate is null");
		}

		if (expectedClass == null) {
			throw new IllegalArgumentException("expectedClass is null");
		}

		this.delegate = delegate;
		this.expectedFeatureId = expectedFeatureId;
		this.expectedClass = expectedClass;
	}

	@Override
	public Notifier getTarget() {
		return null;
	}

	@Override
	public boolean isAdapterForType(Object type) {
		return false;
	}

	@SuppressWarnings("unchecked")
	@Override
	public void notifyChanged(Notification notification) {
		int featureId = notification.getFeatureID(this.expectedClass);

		if (featureId == this.expectedFeatureId) {
			if (notification.getEventType() == Notification.ADD) {
				if (notification.getNewValue() != null) {
					T element = (T) notification.getNewValue();

					this.delegate.added(element);
				}
			} else if (notification.getEventType() == Notification.ADD_MANY) {
				if (notification.getNewValue() != null) {
					List<T> elements = (List<T>) notification.getNewValue();
					this.delegate.addedMany(elements);
				}
			} else if (notification.getEventType() == Notification.REMOVE) {
				if (notification.getOldValue() != null) {
					T element = (T) notification.getOldValue();

					this.delegate.removed(element);
				}
			} else if (notification.getEventType() == Notification.REMOVE_MANY) {
				if (notification.getOldValue() != null) {
					List<T> elements = (List<T>) notification.getOldValue();

					this.delegate.removedMany(elements);
				}
			}
		}
	}

	@Override
	public void setTarget(Notifier newTarget) {

	}

}