/*******************************************************************************
 * Copyright (c) 2012 Obeo.
 * 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:
 *     Obeo - initial API and implementation
 *******************************************************************************/
package org.eclipse.emf.eef.runtime.ui.widgets.util;

import java.util.Collection;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

/**
 * @author <a href="mailto:goulwen.lefur@obeo.fr">Goulwen Le Fur</a>
 *
 */
public class ArrayFeatureContentProvider implements IStructuredContentProvider, ITreeContentProvider {

	private EStructuralFeature feature;
	
	/**
	 * @param feature
	 */
	public ArrayFeatureContentProvider(EStructuralFeature feature) {
		assert feature != null && feature.isMany():"The feature can't be null and must be many";
		this.feature = feature;
	}

	/**
	 * {@inheritDoc}
	 * @see org.eclipse.jface.viewers.IContentProvider#dispose()
	 */
	public void dispose() {}

	/**
	 * {@inheritDoc}
	 * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
	 */
	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {	}

	/**
	 * {@inheritDoc}
	 * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
	 */
	public Object[] getElements(Object inputElement) {
		if (inputElement instanceof EObject && feature.eContainer().equals(((EObject)inputElement).eClass())) {
			return ((Collection<?>)((EObject)inputElement).eGet(feature)).toArray();
		}
		return new Object[0];
	}

	/**
	 * {@inheritDoc}
	 * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
	 */
	public Object[] getChildren(Object parentElement) {
		return null;
	}

	/**
	 * {@inheritDoc}
	 * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
	 */
	public Object getParent(Object element) {
		return null;
	}

	/**
	 * {@inheritDoc}
	 * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
	 */
	public boolean hasChildren(Object element) {
		return false;
	}

}