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/*******************************************************************************
* Copyright (c) 2008, 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.internal.model.value;
import java.util.Iterator;
import org.eclipse.jpt.utility.internal.iterators.ReadOnlyIterator;
import org.eclipse.jpt.utility.internal.model.AbstractModel;
import org.eclipse.jpt.utility.model.value.TreeValueModel;
/**
* Implementation of {@link TreeValueModel} that can be used for
* returning an iterator on a static tree, but still allows listeners to be added.
* Listeners will <em>never</em> be notified of any changes, because there should be none.
*/
public class StaticTreeValueModel<E>
extends AbstractModel
implements TreeValueModel<E>
{
/** The tree's nodes. */
protected final Iterable<? extends E> nodes;
private static final long serialVersionUID = 1L;
/**
* Construct a read-only tree value model for the specified nodes.
*/
public StaticTreeValueModel(Iterable<? extends E> nodes) {
super();
if (nodes == null) {
throw new NullPointerException();
}
this.nodes = nodes;
}
// ********** TreeValueModel implementation **********
public Iterator<E> nodes() {
return new ReadOnlyIterator<E>(this.nodes.iterator());
}
// ********** Object overrides **********
@Override
public void toString(StringBuilder sb) {
sb.append(this.nodes);
}
}
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