001/* Copyright (C) 2013 TU Dortmund
002 * This file is part of LearnLib, http://www.learnlib.de/.
003 * 
004 * LearnLib is free software; you can redistribute it and/or
005 * modify it under the terms of the GNU Lesser General Public
006 * License version 3.0 as published by the Free Software Foundation.
007 * 
008 * LearnLib is distributed in the hope that it will be useful,
009 * but WITHOUT ANY WARRANTY; without even the implied warranty of
010 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
011 * Lesser General Public License for more details.
012 * 
013 * You should have received a copy of the GNU Lesser General Public
014 * License along with LearnLib; if not, see
015 * <http://www.gnu.de/documents/lgpl.en.html>.
016 */
017package de.learnlib.api;
018
019/**
020 * A filter is an oracle that can be used as the middle 
021 * element in a chain of oracles.
022 * 
023 * @param <I> input symbol class
024 * @param <O> output symbol class
025 * 
026 * @author falkhowar
027 */
028public interface Filter<I, O> extends MembershipOracle<I, O> {
029
030    /**
031     * sets oracle for processing membership queries.
032     * 
033     * @param next 
034     */
035    void setNext(MembershipOracle<I, O> next);
036
037}