net.automatalib.util.automata.random.RandomAutomatonGenerator 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.random;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Random;
import net.automatalib.automata.MutableAutomaton;
import net.automatalib.commons.util.collections.CollectionsUtil;
import net.automatalib.commons.util.random.RandomUtil;
public class RandomAutomatonGenerator> {
protected final RandomUtil random;
protected final List inputs;
protected final List spList;
protected final List tpList;
protected final ArrayList states;
protected final A automaton;
public RandomAutomatonGenerator(Random random,
Collection inputs,
Collection stateProps,
Collection transProps,
A automaton) {
this.random = new RandomUtil(random);
if (stateProps == null) {
spList = Collections.singletonList(null);
} else {
spList = CollectionsUtil.randomAccessList(stateProps);
}
if (transProps == null) {
tpList = Collections.singletonList(null);
} else {
tpList = CollectionsUtil.randomAccessList(transProps);
}
this.inputs = CollectionsUtil.randomAccessList(inputs);
this.states = new ArrayList<>();
this.automaton = automaton;
}
public A getAutomaton() {
return automaton;
}
protected TP randomTransProperty() {
return random.choose(tpList);
}
protected S randomState() {
return random.choose(states);
}
protected S randomDistinctState(int stateIdx) {
if (states.size() == 1) {
return null;
}
int idx = random.getRandom().nextInt(states.size() - 1);
if (idx >= stateIdx) {
idx++;
}
return states.get(idx);
}
protected I randomInput() {
return random.choose(inputs);
}
public void addStates(int numStates) {
states.ensureCapacity(states.size() + numStates);
for (int i = 0; i < numStates; i++) {
S state = automaton.addState(randomStateProperty());
states.add(state);
}
}
protected SP randomStateProperty() {
return random.choose(spList);
}
public void chooseInitial() {
S init = random.choose(states);
automaton.setInitial(init, true);
}
public void chooseIntials(int num) {
List inits = random.sampleUnique(states, num);
for (S init : inits) {
automaton.setInitial(init, true);
}
}
}