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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;
import java.io.Serializable;
import java.util.Collection;
import java.util.LinkedList;
/**
* Straightforward implementation of the {@link Queue} interface.
*/
public class SimpleQueue<E>
implements Queue<E>, Cloneable, Serializable
{
private LinkedList<E> elements;
private static final long serialVersionUID = 1L;
// ********** constructors **********
/**
* Construct an empty queue.
*/
public SimpleQueue() {
super();
this.elements = new LinkedList<E>();
}
/**
* Construct a queue containing the elements of the specified
* collection. The queue will dequeue its elements in the same
* order they are returned by the collection's iterator (i.e. the
* first element returned by the collection's iterator will be the
* first element returned by {@link #dequeue()}).
*/
public SimpleQueue(Collection<? extends E> c) {
super();
this.elements = new LinkedList<E>(c);
}
// ********** Queue implementation **********
public void enqueue(E o) {
this.elements.addLast(o);
}
public E dequeue() {
return this.elements.removeFirst();
}
public E peek() {
return this.elements.getFirst();
}
public boolean isEmpty() {
return this.elements.isEmpty();
}
// ********** Cloneable implementation **********
@Override
public SimpleQueue<E> clone() {
try {
@SuppressWarnings("unchecked")
SimpleQueue<E> clone = (SimpleQueue<E>) super.clone();
@SuppressWarnings("unchecked")
LinkedList<E> ll = (LinkedList<E>) this.elements.clone();
clone.elements = ll;
return clone;
} catch (CloneNotSupportedException ex) {
throw new InternalError();
}
}
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.peek());
}
}
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