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This artifact provides various common utility operations for analyzing and manipulating automata and graphs, such as traversal, minimization and copying.
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/* Copyright (C) 2013-2019 TU Dortmund
 * This file is part of AutomataLib, http://www.automatalib.net/.
 *
 * 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 net.automatalib.util.ts.copy;

import java.util.function.Function;
import java.util.function.Predicate;

import net.automatalib.automata.MutableAutomaton;
import net.automatalib.commons.util.Holder;
import net.automatalib.commons.util.mappings.Mapping;
import net.automatalib.commons.util.mappings.MutableMapping;
import net.automatalib.ts.TransitionPredicate;
import net.automatalib.ts.TransitionSystem;
import net.automatalib.util.ts.traversal.TSTraversalAction;
import net.automatalib.util.ts.traversal.TSTraversalVisitor;

public class TSCopyVisitor implements TSTraversalVisitor {

    private final MutableMapping stateMapping;
    private final MutableAutomaton out;

    private final Function inputMapping;
    private final Function spMapping;
    private final Function tpMapping;

    private final Predicate stateFilter;
    private final TransitionPredicate transFilter;

    public TSCopyVisitor(TransitionSystem in,
                         MutableAutomaton out,
                         Function inputMapping,
                         Function spMapping,
                         Function tpMapping,
                         Predicate stateFilter,
                         TransitionPredicate transFilter) {
        this.stateMapping = in.createStaticStateMapping();
        this.out = out;
        this.inputMapping = inputMapping;
        this.spMapping = spMapping;
        this.tpMapping = tpMapping;
        this.stateFilter = stateFilter;
        this.transFilter = transFilter;
    }

    @Override
    public TSTraversalAction processInitial(S1 state, Holder outData) {
        S2 s2 = stateMapping.get(state);
        if (s2 != null) {
            out.setInitial(s2, true);
            return TSTraversalAction.IGNORE;
        } else if (!stateFilter.test(state)) {
            return TSTraversalAction.IGNORE;
        }

        SP2 sp = spMapping.apply(state);
        s2 = out.addInitialState(sp);

        stateMapping.put(state, s2);

        outData.value = s2;
        return TSTraversalAction.EXPLORE;
    }

    @Override
    public boolean startExploration(S1 state, S2 data) {
        return true;
    }

    @Override
    public TSTraversalAction processTransition(S1 source,
                                               S2 source2,
                                               I1 input,
                                               T1 transition,
                                               S1 succ,
                                               Holder outData) {
        if (!transFilter.apply(source, input, transition)) {
            return TSTraversalAction.IGNORE;
        }

        boolean ignore = false;

        S2 succ2 = stateMapping.get(succ);
        if (succ2 == null) {
            if (!stateFilter.test(succ)) {
                return TSTraversalAction.IGNORE;
            }
            SP2 sp = spMapping.apply(succ);
            succ2 = out.addState(sp);
            stateMapping.put(succ, succ2);
        } else {
            ignore = true;
        }

        I2 input2 = inputMapping.apply(input);
        TP2 tp = tpMapping.apply(transition);

        out.addTransition(source2, input2, succ2, tp);
        outData.value = succ2;

        return (ignore) ? TSTraversalAction.IGNORE : TSTraversalAction.EXPLORE;
    }

    public Mapping getStateMapping() {
        return stateMapping;
    }
}