/*******************************************************************************
 * Copyright (c) 2000, 2010 IBM Corporation, See4sys and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     See4sys - added support for problem markers on model objects (rather than 
 *               only on workspace resources). Unfortunately, there was no other 
 *               choice than copying the whole code from 
 *               org.eclipse.ui.views.markers.internal for that purpose because 
 *               many of the relevant classes, methods, and fields are private or
 *               package private.
 *******************************************************************************/
package org.eclipse.sphinx.emf.validation.ui.views;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;

/**
 * The MarkerTreeContentProvider is the content provider for the marker trees.
 * 
 * @since 0.7.0
 */
public class MarkerTreeContentProvider implements ITreeContentProvider {

	TreeViewer viewer;

	boolean hierarchalMode = true;

	private MarkerAdapter adapter;

	/**
	 * Create a new content provider for the view.
	 */
	MarkerTreeContentProvider() {
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
	 */
	@Override
	public Object[] getChildren(Object parentElement) {
		if (parentElement instanceof MarkerNode) {
			return ((MarkerNode) parentElement).getChildren();
		}
		return Util.EMPTY_MARKER_ARRAY;
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
	 */
	@Override
	public Object getParent(Object element) {
		if (element instanceof MarkerNode) {
			return ((MarkerNode) element).getParent();
		}
		return null;
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
	 */
	@Override
	public boolean hasChildren(Object element) {
		if (element instanceof MarkerNode) {
			return ((MarkerNode) element).getChildren().length > 0;
		}
		return false;
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
	 */
	@Override
	public Object[] getElements(Object inputElement) {
		return adapter.getElements();
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.jface.viewers.IContentProvider#dispose()
	 */
	@Override
	public void dispose() {
		// Nothing to do here.
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object,
	 * java.lang.Object)
	 */
	@Override
	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		this.viewer = (TreeViewer) viewer;
		adapter = (MarkerAdapter) newInput;

	}
}