net.automatalib.util.automata.cover.TransitionCoverIterator Maven / Gradle / Ivy
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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.cover;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import javax.annotation.ParametersAreNonnullByDefault;
import net.automatalib.automata.DeterministicAutomaton;
import net.automatalib.commons.util.collections.AbstractTwoLevelIterator;
import net.automatalib.words.Word;
/**
* An iterator for the transition cover of an automaton. Words are computed lazily (i.e. only when request by {@link
* #next()}.
*
* @param
* input symbol type
*
* @author frohme
* @see Covers#transitionCover(DeterministicAutomaton, Collection, Collection)
*/
@ParametersAreNonnullByDefault
class TransitionCoverIterator extends AbstractTwoLevelIterator, I, Word> {
private final Collection inputs;
@SuppressWarnings("unchecked")
TransitionCoverIterator(DeterministicAutomaton automaton, Collection inputs) {
super(new IncrementalStateCoverIterator<>(automaton, inputs, Collections.emptyList()));
this.inputs = (Collection) inputs;
}
@Override
protected Iterator l2Iterator(Word l1Object) {
return inputs.iterator();
}
@Override
protected Word combine(Word l1Object, I l2Object) {
return l1Object.append(l2Object);
}
}