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/*
* This file is part of the GeoLatte project.
*
* GeoLatte 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 3 of the License, or
* (at your option) any later version.
*
* GeoLatte 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 GeoLatte. If not, see .
*
* Copyright (C) 2010 - 2010 and Ownership of code is shared by:
* Qmino bvba - Romeinsestraat 18 - 3001 Heverlee (http://www.qmino.com)
* Geovise bvba - Generaal Eisenhowerlei 9 - 2140 Antwerpen (http://www.geovise.com)
*/
package org.geolatte.common.transformer;
/**
* A Transformer is basically both a (Transformer)Sink for input data and a (Transformer)Source of transformed output data.
* A Transformer executes some sort of transformation over a collection of input elements to yield a collection of output elements.
* Implementers can use the Transformation interface to recurse the transformations of individual elements.
*
* Remark: A Transformer can be stateful and should never be reused!
*
* @param The type of the elements that will be transformed.
* @param The type of the transformed elements.
*
*
*
* @author Bert Vanhooff
* @author Qmino bvba
* @since SDK1.5
*/
public abstract class Transformer {
/**
* Sets the data input source for this sink.
*
* This method should never be called directly by clients when the Transformer is intended to be used in a transformer chain.
*
* @param input The data source.
*/
protected abstract void setInput(Iterable input);
/**
* Gets the output for the transformation given the input set by setInput().
* On each "next()", the transformer pulls an element from the currentInput and pulls it through the transformation.
* Mind that the remove() method on the iterator has no effect.
*
* As long as the input does not change, output() returns the same Iterable. If it has changed, output() returns an Iterable for the new input.
*
* This method should never be called directly by clients when the TransformerSource is intended to be used in a transformer chain.
*
* @return An Iterable which contains the result of the transformation (constructed on the fly) or null if no input has been set.
*/
protected abstract Iterable output();
}
