/*******************************************************************************
 * Copyright (c) 2006, 2007 Oracle. 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:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.ui.internal.selection;

import org.eclipse.jpt.core.internal.context.base.IJpaContextNode;

@SuppressWarnings("nls")
public class JpaSelection
	implements IJpaSelection
{
	private IJpaContextNode selectedNode;


	public JpaSelection(IJpaContextNode selectedNode) {
		if (selectedNode == null) {
			throw new NullPointerException("A 'selectedNode' is required; otherwise use NULL_SELECTION.");
		}
		this.selectedNode = selectedNode;
	}

	public IJpaContextNode getSelectedNode() {
		return selectedNode;
	}

	public boolean isEmpty() {
		// by definition, this selection is never empty
		// use IJpaSelection.NULL_SELECTION for empty selections
		return false;
	}

	@Override
	public boolean equals(Object obj) {
		if (! (obj instanceof JpaSelection)) {
			return false;
		}

		return this.selectedNode.equals(((JpaSelection) obj).selectedNode);
	}

	@Override
	public int hashCode() {
		return this.selectedNode.hashCode();
	}

	@Override
	public String toString() {
		return selectedNode.toString();
	}
}