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/*
 * Copyright © 1996-2009 GlobalMentor, Inc. 
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.globalmentor.swing.rdf.tree;

import javax.swing.tree.*;

import static com.globalmentor.rdf.RDFResources.*;

import com.globalmentor.rdf.*;

/**
 * A tree node that represents a resource described in RDF. The resource is stored as the user object of the tree node. The string representation of the node is
 * the rdfs:label property of the resource, or the resource reference URI if there is no label present.
 * @author Garret Wilson
 */
public class RDFResourceTreeNode extends DefaultMutableTreeNode {

	/**
	 * Convenience function for retrieving the represented RDF resource.
	 * @return The RDF resource this tree node represents, already cast to a RDFResource.
	 * @see DefaultMutableTreeNode#getUserObject
	 */
	public RDFResource getRDFResource() {
		return (RDFResource)getUserObject(); //return the user object cast to an RDF resource
	}

	/**
	 * Constructs a tree node from an RDF resource.
	 * @param rdfResource The resource to represent in the tree.
	 */
	public RDFResourceTreeNode(final RDFResource rdfResource) {
		super(rdfResource); //store the resource as the user object
	}

	/** @return A string representation to display as the tree node's label. */
	public String toString() {
		return getDisplayLabel(getRDFResource()); //return the display label of the resource
		/*TODO del; can reference null when there is no reference URI
		//TODO del		final RDFResource rdfResource=(RDFResource)getUserObject(); //get the resource we're representing
				final RDFResource rdfResource=getRDFResource(); //get the resource we're representing
				final RDFLiteral labelLiteral=RDFSUtilities.getLabel(rdfResource);  //get the label of the resource, if it has one
				return labelLiteral!=null ? labelLiteral.toString() : rdfResource.getReferenceURI().toString(); //return the label, or the reference URI if there is no label
		*/
	}
}