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/*******************************************************************************
* Copyright (c) 2007, 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.common.utility.model.event;
import java.util.Collection;
import org.eclipse.jpt.common.utility.internal.iterables.ArrayIterable;
import org.eclipse.jpt.common.utility.model.Model;
/**
* A "tree change" event gets delivered whenever a model changes a "bound"
* or "constrained" tree in a manner that is not easily characterized by
* the other tree events.
* A <code>TreeChangeEvent</code> is sent as an
* argument to the {@link org.eclipse.jpt.common.utility.model.listener.TreeChangeListener}.
* <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 final class TreeChangeEvent extends TreeEvent {
/**
* The current nodes in the changed tree.
*/
protected final Object[] nodes;
private static final long serialVersionUID = 1L;
// ********** constructor **********
/**
* Construct a new tree change event.
*
* @param source The object on which the event initially occurred.
* @param treeName The programmatic name of the tree that was changed.
* @param nodes The current nodes in the changed tree.
*/
public TreeChangeEvent(Model source, String treeName, Collection<?> nodes) {
this(source, treeName, nodes.toArray()); // NPE if 'nodes' is null
}
private TreeChangeEvent(Model source, String treeName, Object[] nodes) {
super(source, treeName);
this.nodes = nodes;
}
// ********** standard state **********
/**
* Return the current nodes in the changed tree.
*/
public Iterable<?> getNodes() {
return new ArrayIterable<Object>(this.nodes);
}
/**
* Return the current nodes in the changed tree.
*/
public int getNodesSize() {
return this.nodes.length;
}
// ********** cloning **********
public TreeChangeEvent clone(Model newSource) {
return this.clone(newSource, this.treeName);
}
/**
* Return a copy of the event with the specified source and tree name
* replacing the current source and tree name.
*/
public TreeChangeEvent clone(Model newSource, String newTreeName) {
return new TreeChangeEvent(newSource, newTreeName, this.nodes);
}
}
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