/*******************************************************************************
* Copyright (c) 2001, 2008 Oracle Corporation 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:
* Oracle Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.jsf.common.internal.strategy;
/**
* A strategy that takes an INPUT, performs a calculation on it, and returns
* an OUTPUT
* @author cbateman
*
* @param <INPUT>
* @param <OUTPUT>
*/
public interface ISimpleStrategy<INPUT, OUTPUT>
{
/**
* Perform the algorithm on input and return OUTPUT. This type of
* operation should avoid side-effects, but may throw exceptions.
*
* @param input
* @return the result of the strategy algorithm
* @throws Exception implementers should narrow what exceptions are thrown.
*/
public OUTPUT perform(INPUT input) throws Exception;
/**
* @return the single value that perform will return if it cannot calculate
* a meaningful result for an input. The value must be unique, the same
* for all inputs and must be testable using the '==' operator.
*/
public OUTPUT getNoResult();
}