EDIT

// $Id$

/**

 * Copyright (C) 2007 EDIT

 * European Distributed Institute of Taxonomy 

 * http://www.e-taxonomy.eu

 * 

 * The contents of this file are subject to the Mozilla Public License Version 1.1

 * See LICENSE.TXT at the top of this package for the full license terms.

 */

package eu.etaxonomy.taxeditor.editor.key.polytomous;

import java.util.ArrayList;

import java.util.List;

import org.eclipse.jface.viewers.Viewer;

import org.eclipse.zest.core.viewers.IGraphContentProvider;

import eu.etaxonomy.cdm.model.description.PolytomousKey;

import eu.etaxonomy.cdm.model.description.PolytomousKeyNode;

import eu.etaxonomy.taxeditor.model.PolytomousKeyRelationship;

/**

 * 

 * @author n.hoffmann

 * @created Mar 30, 2011

 * @version 1.0

 */

class PolytomousKeyGraphContentProvider implements IGraphContentProvider {

	private List<PolytomousKeyRelationship> relations;

	@Override

	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {

	}

	@Override

	public void dispose() {

	}

	@Override

	public Object[] getElements(Object inputElement) {

		relations = new ArrayList<PolytomousKeyRelationship>();

		if (inputElement instanceof PolytomousKey) {

			getTreeRecursively(relations, inputElement);

		}

		return relations.toArray();

	}

	private void getTreeRecursively(List<PolytomousKeyRelationship> relations,

			Object parent) {

		List<PolytomousKeyNode> children;

		if (parent instanceof PolytomousKeyNode) {

			children = ((PolytomousKeyNode) parent).getChildren();

		} else if (parent instanceof PolytomousKey) {

			children = new ArrayList<PolytomousKeyNode>();

			children.add(((PolytomousKey) parent).getRoot());

		} else {

			throw new RuntimeException(

					"Parent element has to be PolytomousKeyNode or PolytomousKey, but was: "

							+ parent.getClass());

		}

		for (PolytomousKeyNode childNode : children) {

			relations.add(new PolytomousKeyRelationship(parent, childNode));

			getTreeRecursively(relations, childNode);

		}

	}

	@Override

	public Object getSource(Object relationship) {

		return ((PolytomousKeyRelationship) relationship).getSource();

	}

	@Override

	public Object getDestination(Object relationship) {

		return ((PolytomousKeyRelationship) relationship).getDestination();

	}

}