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This artifact provides the implementation of the AAAR learning algorithm as described in the paper "Automata Learning with Automated Alphabet Abstraction Refinement" (https://dx.doi.org/10.1007/978-3-642-18275-4_19) by Falk Howar, Bernhard Steffen, and Maik Merten.

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/* Copyright (C) 2013-2023 TU Dortmund
 * This file is part of LearnLib, http://www.learnlib.de/.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.learnlib.algorithm.aaar.generic;

import java.util.function.Function;

import de.learnlib.algorithm.LearnerConstructor;
import de.learnlib.algorithm.LearningAlgorithm.DFALearner;
import de.learnlib.algorithm.aaar.TranslatingDFA;
import de.learnlib.oracle.MembershipOracle;
import net.automatalib.alphabet.SupportsGrowingAlphabet;
import net.automatalib.automaton.fsa.CompactDFA;
import net.automatalib.automaton.fsa.DFA;

/**
 * A {@link DFA}-specific refinement of {@link AbstractGenericAAARLearner}.
 *
 * @param 
 *         learner type
 * @param 
 *         abstract input symbol type
 * @param 
 *         concrete input symbol type
 */
public class GenericAAARLearnerDFA & SupportsGrowingAlphabet, AI, CI>
        extends AbstractGenericAAARLearner, DFA, AI, CI, Boolean> {

    /**
     * Constructor.
     *
     * @param learnerConstructor
     *         the provider for constructing the internal (concrete) learner
     * @param oracle
     *         the (concrete) membership oracle
     * @param initialConcrete
     *         the initial (concrete) input symbol used for starting the learning process
     * @param abstractor
     *         the function for creating new abstract input symbols given concrete one. This function only receives
     *         input symbols from the provided (concrete) counterexamples
     */
    public GenericAAARLearnerDFA(LearnerConstructor learnerConstructor,
                                 MembershipOracle oracle,
                                 CI initialConcrete,
                                 Function abstractor) {
        super(learnerConstructor, oracle, initialConcrete, abstractor);
    }

    @Override
    public DFA getHypothesisModel() {
        final DFA concrete = super.getLearnerHypothesisModel();
        final CompactDFA result = new CompactDFA<>(getAbstractAlphabet());

        super.copyAbstract(concrete, result);

        return result;
    }

    @Override
    public DFA getTranslatingHypothesisModel() {
        return new TranslatingDFA<>(super.getLearnerHypothesisModel(), this::getTreeForRepresentative);
    }

}