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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.common.utility.internal.iterables;
import java.util.ListIterator;
import org.eclipse.jpt.common.utility.internal.StringTools;
import org.eclipse.jpt.common.utility.internal.iterators.SingleElementListIterator;
/**
* A <code>SingleElementListIterable</code> returns a {@link ListIterator}
* that holds a single element
* and returns it with the first call to {@link ListIterator#next()}, at
* which point it will return <code>false</code> to any subsequent
* call to {@link ListIterator#hasNext()}. Likewise, it will return <code>false</code>
* to a call to {@link ListIterator#hasPrevious()} until a call to {@link ListIterator#next()},
* at which point a call to {@link ListIterator#previous()} will return the
* single element.
* <p>
* A <code>SingleElementListIterable</code> is equivalent to the
* {@link Iterable} returned by:
* {@link java.util.Collections#singletonList(Object)}.
*
* @param <E> the type of elements returned by the list iterable's list iterator
*
* @see SingleElementListIterator
* @see SingleElementIterable
*/
public class SingleElementListIterable<E>
implements ListIterable<E>
{
private final E element;
/**
* Construct a list iterable that contains only the specified element.
*/
public SingleElementListIterable(E element) {
super();
this.element = element;
}
public ListIterator<E> iterator() {
return new SingleElementListIterator<E>(this.element);
}
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.element);
}
}
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