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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.graphs.copy;

import java.util.Collection;

import net.automatalib.commons.util.Holder;
import net.automatalib.commons.util.mappings.Mapping;
import net.automatalib.graphs.IndefiniteGraph;
import net.automatalib.graphs.MutableGraph;
import net.automatalib.util.graphs.traversal.GraphTraversal;
import net.automatalib.util.graphs.traversal.GraphTraversalAction;
import net.automatalib.util.graphs.traversal.GraphTraversalVisitor;
import net.automatalib.util.traversal.TraversalOrder;

final class TraversalGraphCopy
        extends AbstractGraphCopy>
        implements GraphTraversalVisitor {

    private final TraversalOrder traversalOrder;
    private final Collection initNodes;
    private final int limit;

    TraversalGraphCopy(TraversalOrder traversalOrder,
                       int limit,
                       IndefiniteGraph inGraph,
                       Collection initNodes,
                       MutableGraph outGraph,
                       Mapping npMapping,
                       Mapping epMapping) {
        super(inGraph, outGraph, npMapping, epMapping);
        this.limit = limit;
        this.traversalOrder = traversalOrder;
        this.initNodes = initNodes;
    }

    @Override
    public void doCopy() {
        GraphTraversal.traverse(traversalOrder, inGraph, limit, initNodes, this);
    }

    @Override
    public GraphTraversalAction processInitial(N1 initialNode, Holder outData) {
        outData.value = copyNode(initialNode);
        return GraphTraversalAction.EXPLORE;
    }

    @Override
    public boolean startExploration(N1 node, N2 data) {
        return true;
    }

    @Override
    public void finishExploration(N1 node, N2 data) {
    }

    @Override
    public GraphTraversalAction processEdge(N1 srcNode, N2 srcData, E1 edge, N1 tgtNode, Holder outData) {
        N2 freshTgt = copyEdgeChecked(srcData, edge, tgtNode);
        if (freshTgt != null) {
            outData.value = freshTgt;
            return GraphTraversalAction.EXPLORE;
        }
        return GraphTraversalAction.IGNORE;
    }

    @Override
    public void backtrackEdge(N1 srcNode, N2 srcData, E1 edge, N1 tgtNode, N2 tgtData) {
    }

}