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/*******************************************************************************
* Copyright (c) 2009 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.utility.model.event;
import org.eclipse.jpt.utility.model.Model;
/**
* A "tree" event gets delivered whenever a model changes a "bound"
* or "constrained" tree. A <code>TreeEvent</code> is sent as an
* argument to the {@link org.eclipse.jpt.utility.model.listener.TreeChangeListener}.
* The intent is that any listener
* can keep itself synchronized with the model's tree via the tree events
* it receives and need not maintain a reference to the original tree.
* <p>
* Provisional API: This class is part of an interim API that is still
* under development and expected to change significantly before reaching
* stability. It is available at this early stage to solicit feedback from
* pioneering adopters on the understanding that any code that uses this API
* will almost certainly be broken (repeatedly) as the API evolves.
*/
public abstract class TreeEvent extends ChangeEvent {
/** Name of the tree that changed. */
final String treeName;
private static final long serialVersionUID = 1L;
/**
* Construct a new tree event.
*
* @param source The object on which the event initially occurred.
* @param treeName The programmatic name of the tree that was changed.
*/
public TreeEvent(Model source, String treeName) {
super(source);
if (treeName == null) {
throw new NullPointerException();
}
this.treeName = treeName;
}
/**
* Return the programmatic name of the tree that was changed.
*/
public String getTreeName() {
return this.treeName;
}
@Override
protected void toString(StringBuilder sb) {
sb.append(this.treeName);
}
}
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