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This artifact provides various common utility operations for analyzing and manipulating
automata and graphs, such as traversal, minimization and copying.
/* 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.automata.copy;
import java.util.Collection;
import java.util.function.Function;
import java.util.function.Predicate;
import net.automatalib.automata.Automaton;
import net.automatalib.automata.MutableAutomaton;
import net.automatalib.commons.util.Holder;
import net.automatalib.ts.TransitionPredicate;
import net.automatalib.ts.TransitionSystem;
import net.automatalib.util.traversal.TraversalOrder;
import net.automatalib.util.ts.traversal.TSTraversal;
import net.automatalib.util.ts.traversal.TSTraversalAction;
import net.automatalib.util.ts.traversal.TSTraversalVisitor;
final class TraversalAutomatonCopy
extends AbstractLowLevelAutomatonCopier>
implements TSTraversalVisitor {
private final TraversalOrder traversalOrder;
private final int limit;
TraversalAutomatonCopy(TraversalOrder traversalOrder,
int limit,
TransitionSystem in,
Collection extends I1> inputs,
MutableAutomaton out,
Function super I1, ? extends I2> inputsMapping,
Function super S1, ? extends SP2> spMapping,
Function super T1, ? extends TP2> tpMapping,
Predicate super S1> stateFilter,
TransitionPredicate super S1, ? super I1, ? super T1> transFilter) {
super(in, inputs, out, inputsMapping, spMapping, tpMapping, stateFilter, transFilter);
this.traversalOrder = traversalOrder;
this.limit = limit;
}
@Override
public void doCopy() {
TSTraversal.traverse(traversalOrder, in, limit, inputs, this);
}
@Override
public TSTraversalAction processInitial(S1 state, Holder outData) {
if (stateFilter.test(state)) {
outData.value = copyInitialState(state);
return TSTraversalAction.EXPLORE;
}
return TSTraversalAction.IGNORE;
}
@Override
public boolean startExploration(S1 state, S2 data) {
return true;
}
@Override
public TSTraversalAction processTransition(S1 source,
S2 srcData,
I1 input,
T1 transition,
S1 succ,
Holder outData) {
if (transFilter.apply(source, input, transition) && stateFilter.test(succ)) {
S2 succ2 = copyTransitionChecked(srcData, inputsMapping.apply(input), transition, succ);
if (succ2 == null) {
return TSTraversalAction.IGNORE;
}
outData.value = succ2;
return TSTraversalAction.EXPLORE;
}
return TSTraversalAction.IGNORE;
}
static final class CopyMethod implements AutomatonCopyMethod {
private final TraversalOrder traversalOrder;
CopyMethod(TraversalOrder traversalOrder) {
this.traversalOrder = traversalOrder;
}
@Override
public LowLevelAutomatonCopier createLowLevelCopier(
Automaton in,
Collection extends I1> inputs,
MutableAutomaton out,
Function super I1, ? extends I2> inputsMapping,
Function super S1, ? extends SP2> spMapping,
Function super T1, ? extends TP2> tpMapping,
Predicate super S1> stateFilter,
TransitionPredicate super S1, ? super I1, ? super T1> transitionFilter) {
return new TraversalAutomatonCopy<>(traversalOrder,
in.size(),
in,
inputs,
out,
inputsMapping,
spMapping,
tpMapping,
stateFilter,
transitionFilter);
}
}
}