package it.unimi.dsi.fastutil;
/*
* fastutil: Fast & compact type-specific collections for Java
*
* Copyright (C) 2002-2008 Sebastiano Vigna
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/** An abstract class providing basic methods for implementing the {@link Stack} interface.
*
* <P>This class just defines {@link Stack#top()} as {@link Stack#peek(int) peek(0)}, and
* {@link Stack#peek(int)} as throwing an {@link UnsupportedOperationException}.
*
* Subclasses of this class may choose to implement just {@link Stack#push(Object)},
* {@link Stack#pop()} and {@link Stack#isEmpty()}, or (but this is not
* required) go farther and implement {@link Stack#top()}, or even {@link
* Stack#peek(int)}.
*/
public abstract class AbstractStack<K> implements Stack<K> {
public K top() {
return peek( 0 );
}
public K peek( int i ) {
throw new UnsupportedOperationException();
}
}
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