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/**
* Copyright (c) 2004 - 2010 Eike Stepper (Berlin, Germany) and others.
* 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:
* Eike Stepper - initial API and implementation
* Andre Dietisheim - maintenance
*/
package org.eclipse.emf.cdo.ui.internal.branch.layout;
import java.util.LinkedList;
/**
* A double ended list, that returns <tt>null</tt> if no element is present. Mimics the jdk 1.6 Deque.
*
* @author Eike Stepper
*/
public final class Deque<E> extends LinkedList<E>
{
private static final long serialVersionUID = 1L;
/**
* Returns the first element if present, <tt>null</tt> otherwise.
*
* @return the first element in this list.
*/
public E peekFirst()
{
if (isEmpty())
{
return null;
}
return getFirst();
}
/**
* Returns the last element if present, <tt>null</tt> otherwise.
*
* @return the e
*/
public E peekLast()
{
if (isEmpty())
{
return null;
}
return getLast();
}
}
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