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/*******************************************************************************
* Copyright (c) 2007, 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.EmptyStackException;
import java.util.LinkedList;
import java.util.NoSuchElementException;
/**
* Straightforward implementation of the {@link Stack} interface.
*/
public class SimpleStack<E>
implements Stack<E>, Cloneable, Serializable
{
private LinkedList<E> elements;
private static final long serialVersionUID = 1L;
// ********** constructors **********
/**
* Construct an empty stack.
*/
public SimpleStack() {
super();
this.elements = new LinkedList<E>();
}
/**
* Construct a stack containing the elements of the specified
* collection. The stack will pop its elements in reverse of the
* order they are returned by the collection's iterator (i.e. the
* last element returned by the collection's iterator will be the
* first element returned by {@link #pop()}).
*/
public SimpleStack(Collection<? extends E> collection) {
super();
this.elements = new LinkedList<E>(collection);
}
// ********** Stack implementation **********
public void push(E element) {
this.elements.addLast(element);
}
public E pop() {
try {
return this.elements.removeLast();
} catch (NoSuchElementException ex) {
throw new EmptyStackException();
}
}
public E peek() {
try {
return this.elements.getLast();
} catch (NoSuchElementException ex) {
throw new EmptyStackException();
}
}
public boolean isEmpty() {
return this.elements.isEmpty();
}
// ********** standard methods **********
@Override
public SimpleStack<E> clone() {
try {
@SuppressWarnings("unchecked")
SimpleStack<E> clone = (SimpleStack<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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