6433387082

Committed 06 Oct 2023 03:10PM UTC coverage: 92.296% (-0.007%) from 92.303%

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update Falk's developer id

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/drivers/simulator/src/main/java/de/learnlib/driver/util/MealySimulatorSUL.java

/* Copyright (C) 2013-2023 TU Dortmund
 * This file is part of LearnLib, http://www.learnlib.de/.
 *
 * 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 de.learnlib.driver.util;

import de.learnlib.api.SUL;
import net.automatalib.automata.transducers.MealyMachine;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A {@link SUL} that implements steps by stepping through a {@link MealyMachine}.
 * <p>
 * Note: this SUL is {@link SUL#fork() forkable}.
 *
 * @param <I>
 *         input symbol type
 * @param <O>
 *         output symbol type
 */
public class MealySimulatorSUL<I, O> implements SUL<I, O> {

    private final MealySimulatorSULImpl<?, I, ?, O> impl;

    /**
     * Constructor, using {@code null} as the output for undefined transitions.
     * <p>
     * This constructor is provided for convenience. It is equivalent to calling {@link #MealySimulatorSUL(MealyMachine,
     * Object)} with {@code null} as the second argument.
     *
     * @param mealy
     *         Mealy machine
     */
    public MealySimulatorSUL(MealyMachine<?, I, ?, O> mealy) {
        this(mealy, null);
    }

    /**
     * Constructor.
     * <p>
     * If the given Mealy machine has no undefined transitions, the second parameter has no effect. Otherwise, if the
     * Mealy machine is partial and sequences of {@link #step(Object)} invocations reach an undefined transition,
     * subsequent invocations of {@link #step(Object)} will simply return the specified {@code noTransOut} symbol.
     *
     * @param mealy
     *         the Mealy machine
     * @param noTransOut
     *         the output symbol to use when encountering undefined transitions
     */
    public MealySimulatorSUL(MealyMachine<?, I, ?, O> mealy, O noTransOut) {
        this(new MealySimulatorSULImpl<>(mealy, noTransOut));
    }

    protected MealySimulatorSUL(MealySimulatorSULImpl<?, I, ?, O> impl) {
        this.impl = impl;
    }

    @Override
    public void pre() {
        impl.pre();
    }

    @Override
    public void post() {
        impl.post();
    }

    @Override
    public O step(I in) {
        return impl.step(in);
    }

    @Override
    public boolean canFork() {
        return impl.canFork();
    }

    @Override
    public SUL<I, O> fork() {
        return new MealySimulatorSUL<>(impl.fork());
    }

    /**
     * Implementation class, used to hide {@code S} and {@code T} type parameters.
     *
     * @param <S>
     *         Mealy machine state type
     * @param <I>
     *         input symbol type
     * @param <T>
     *         Mealy machine transition type
     * @param <O>
     *         output symbol type
     */
    static class MealySimulatorSULImpl<S, I, T, O> implements SUL<I, O> {

        private final MealyMachine<S, I, T, O> mealy;
        private final O noTransOut;
        private @Nullable S curr;

        MealySimulatorSULImpl(MealyMachine<S, I, T, O> mealy, O noTransOut) {
            this.mealy = mealy;
            this.noTransOut = noTransOut;
        }

        @Override
        public void pre() {
            this.curr = mealy.getInitialState();
        }

        @Override
        public void post() {
            this.curr = null;
        }

        @Override
        public O step(I in) {
            O out = noTransOut;
            if (curr != null) {
                T trans = mealy.getTransition(curr, in);
                if (trans != null) {
                    out = mealy.getTransitionOutput(trans);
                    curr = mealy.getSuccessor(trans);
                } else {
                    curr = null;
                }
            }
            return out;
        }

        @Override
        public boolean canFork() {
            return true;
        }

        @Override
        public MealySimulatorSULImpl<S, I, T, O> fork() {
            return new MealySimulatorSULImpl<>(mealy, noTransOut);
        }

        S getCurr() {
            if (curr == null) {
                throw new IllegalStateException("SUL was not properly initialized");
            }
            return curr;
        }
    }

}

1	/* Copyright (C) 2013-2023 TU Dortmund
2	* This file is part of LearnLib, http://www.learnlib.de/.
3	*
4	* Licensed under the Apache License, Version 2.0 (the "License");
5	* you may not use this file except in compliance with the License.
6	* You may obtain a copy of the License at
7	*
8	* http://www.apache.org/licenses/LICENSE-2.0
9	*
10	* Unless required by applicable law or agreed to in writing, software
11	* distributed under the License is distributed on an "AS IS" BASIS,
12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	* See the License for the specific language governing permissions and
14	* limitations under the License.
15	*/
16	package de.learnlib.driver.util;
17
18	import de.learnlib.api.SUL;
19	import net.automatalib.automata.transducers.MealyMachine;
20	import org.checkerframework.checker.nullness.qual.Nullable;
21
22	/**
23	* A {@link SUL} that implements steps by stepping through a {@link MealyMachine}.
24	* <p>
25	* Note: this SUL is {@link SUL#fork() forkable}.
26	*
27	* @param <I>
28	* input symbol type
29	* @param <O>
30	* output symbol type
31	*/
32	public class MealySimulatorSUL<I, O> implements SUL<I, O> {
33
34	private final MealySimulatorSULImpl<?, I, ?, O> impl;
35
36	/**
37	* Constructor, using {@code null} as the output for undefined transitions.
38	* <p>
39	* This constructor is provided for convenience. It is equivalent to calling {@link #MealySimulatorSUL(MealyMachine,
40	* Object)} with {@code null} as the second argument.
41	*
42	* @param mealy
43	* Mealy machine
44	*/
45	public MealySimulatorSUL(MealyMachine<?, I, ?, O> mealy) {
46	this(mealy, null);	1✔
47	}	1✔
48
49	/**
50	* Constructor.
51	* <p>
52	* If the given Mealy machine has no undefined transitions, the second parameter has no effect. Otherwise, if the
53	* Mealy machine is partial and sequences of {@link #step(Object)} invocations reach an undefined transition,
54	* subsequent invocations of {@link #step(Object)} will simply return the specified {@code noTransOut} symbol.
55	*
56	* @param mealy
57	* the Mealy machine
58	* @param noTransOut
59	* the output symbol to use when encountering undefined transitions
60	*/
61	public MealySimulatorSUL(MealyMachine<?, I, ?, O> mealy, O noTransOut) {
62	this(new MealySimulatorSULImpl<>(mealy, noTransOut));	1✔
63	}	1✔
64
65	protected MealySimulatorSUL(MealySimulatorSULImpl<?, I, ?, O> impl) {	1✔
66	this.impl = impl;	1✔
67	}	1✔
68
69	@Override
70	public void pre() {
71	impl.pre();	1✔
72	}	1✔
73
74	@Override
75	public void post() {
76	impl.post();	1✔
77	}	1✔
78
79	@Override
80	public O step(I in) {
81	return impl.step(in);	1✔
82	}
83
84	@Override
85	public boolean canFork() {
86	return impl.canFork();	1✔
87	}
88
89	@Override
90	public SUL<I, O> fork() {
91	return new MealySimulatorSUL<>(impl.fork());	1✔
92	}
93
94	/**
95	* Implementation class, used to hide {@code S} and {@code T} type parameters.
96	*
97	* @param <S>
98	* Mealy machine state type
99	* @param <I>
100	* input symbol type
101	* @param <T>
102	* Mealy machine transition type
103	* @param <O>
104	* output symbol type
105	*/
106	static class MealySimulatorSULImpl<S, I, T, O> implements SUL<I, O> {
107
108	private final MealyMachine<S, I, T, O> mealy;
109	private final O noTransOut;
110	private @Nullable S curr;
111
112	MealySimulatorSULImpl(MealyMachine<S, I, T, O> mealy, O noTransOut) {	1✔
113	this.mealy = mealy;	1✔
114	this.noTransOut = noTransOut;	1✔
115	}	1✔
116
117	@Override
118	public void pre() {
119	this.curr = mealy.getInitialState();	1✔
120	}	1✔
121
122	@Override
123	public void post() {
124	this.curr = null;	1✔
125	}	1✔
126
127	@Override
128	public O step(I in) {
129	O out = noTransOut;	1✔
130	if (curr != null) {	1✔
131	T trans = mealy.getTransition(curr, in);	1✔
132	if (trans != null) {	1✔
133	out = mealy.getTransitionOutput(trans);	1✔
134	curr = mealy.getSuccessor(trans);	1✔
135	} else {
136	curr = null;	×
137	}
138	}
139	return out;	1✔
140	}
141
142	@Override
143	public boolean canFork() {
144	return true;	1✔
145	}
146
147	@Override
148	public MealySimulatorSULImpl<S, I, T, O> fork() {
149	return new MealySimulatorSULImpl<>(mealy, noTransOut);	1✔
150	}
151
152	S getCurr() {
153	if (curr == null) {	1✔
154	throw new IllegalStateException("SUL was not properly initialized");	×
155	}
156	return curr;	1✔
157	}
158	}
159
160	}

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