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/*******************************************************************************
* Copyright (c) 2005, 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.internal.iterators;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.eclipse.jpt.common.utility.internal.StringTools;
/**
* A <code>SingleElementIterator</code> holds a single element
* and returns it with the first call to {@link #next()}, at
* which point it will return <code>false</code> to any subsequent
* call to {@link #hasNext()}.
* <p>
* A <code>SingleElementIterator</code> is equivalent to the
* {@link Iterator} returned by:
* {@link java.util.Collections#singleton(Object element)}<code>.iterator()</code>
*
* @param <E> the type of elements returned by the iterator
*
* @see org.eclipse.jpt.common.utility.internal.iterables.SingleElementIterable
*/
public class SingleElementIterator<E>
implements Iterator<E>
{
private final E element;
private boolean done;
/**
* Construct an iterator that returns only the specified element.
*/
public SingleElementIterator(E element) {
super();
this.element = element;
this.done = false;
}
public boolean hasNext() {
return ! this.done;
}
public E next() {
if (this.done) {
throw new NoSuchElementException();
}
this.done = true;
return this.element;
}
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.element);
}
}
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