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/*******************************************************************************
* Copyright (c) 2006, 2008 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.jpa.ui.internal.selection;
import org.eclipse.jpt.jpa.core.JpaStructureNode;
/**
* Straightforward implementation of the JpaSelection interface.
*/
public class DefaultJpaSelection
implements JpaSelection
{
private final JpaStructureNode selectedNode;
public DefaultJpaSelection(JpaStructureNode selectedNode) {
super();
if (selectedNode == null) {
throw new NullPointerException("A 'selectedNode' is required; otherwise use NULL_SELECTION.");
}
this.selectedNode = selectedNode;
}
public JpaStructureNode getSelectedNode() {
return this.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;
}
JpaSelection other = (JpaSelection) obj;
return ( ! other.isEmpty()) && this.selectedNode.equals(other.getSelectedNode());
}
@Override
public int hashCode() {
return this.selectedNode.hashCode();
}
@Override
public String toString() {
return this.selectedNode.toString();
}
}
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