/*******************************************************************************
 * Copyright (c) 2004, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.internal.intro.impl.model.viewer;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.ui.internal.intro.impl.model.AbstractIntroContainer;
import org.eclipse.ui.internal.intro.impl.model.AbstractIntroElement;

public class IntroModelContentProvider implements ITreeContentProvider {

    @Override
	public Object[] getChildren(Object element) {

        AbstractIntroElement introElement = null;
        if (element instanceof AbstractIntroElement)
            // synch the resource first.
            introElement = (AbstractIntroElement) element;

        if (introElement != null
                && introElement
                    .isOfType(AbstractIntroElement.ABSTRACT_CONTAINER))
            return ((AbstractIntroContainer) introElement).getChildren();

        return new Object[0];
    }

    @Override
	public Object getParent(Object element) {
        AbstractIntroElement introElement = null;
        if (element instanceof AbstractIntroElement) {
            // synch the resource first.
            introElement = (AbstractIntroElement) element;
            return introElement.getParent();
        }
        return null;
    }


    @Override
	public boolean hasChildren(Object element) {
        AbstractIntroElement introElement = null;
        if (element instanceof AbstractIntroElement)
            // synch the resource first.
            introElement = (AbstractIntroElement) element;
        if (introElement != null
                && introElement
                    .isOfType(AbstractIntroElement.ABSTRACT_CONTAINER))
            return true;
        return false;
    }


    @Override
	public Object[] getElements(Object element) {
        return getChildren(element);
    }


    @Override
	public void dispose() {
        // nothing to dispose
    }

    @Override
	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        // do nothing

    }

}
