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Some common interfaces for Java
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/*
 * Copyright (c) 2015 Torsten Krause, Markenwerk GmbH
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package net.markenwerk.commons.interfaces;

import net.markenwerk.commons.exceptions.ProcessingException;

/**
 * A {@link Processor} is used to process (transform, translate, project,
 * evaluate, ...) values.
 * 
 * 
 * @param 
 *            The type of the involved values.
 * @author Torsten Krause (tk at markenwerk dot net)
 * @since 4.0.0
 */
public interface Processor {

	/**
	 * Called to process a given value.
	 * 
	 * 
	 * Implementers should catch any exception and wrap them in a
	 * {@link ProcessingException}.
	 * 
	 * 

	 * Depending on the use case, if the given value {@literal null}, the
	 * {@link Processor} should return {@literal null}.
	 * 
	 * 
	 * It lies in the responsibility of the caller, to handle unwanted
	 * {@literal null}-values by replacing them with a sensible default value or
	 * throwing an appropriate {@link ProcessingException}.
	 * 
	 * @param value
	 *            The value to be processed.
	 * @return The processed value.
	 * @throws ProcessingException
	 *             If the conversion failed.
	 */
	public Value process(Value value) throws ProcessingException;

}