6660471831

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/api/src/main/java/de/learnlib/api/oracle/MembershipOracle.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.api.oracle;

import java.util.Collection;
import java.util.Collections;

import de.learnlib.api.oracle.parallelism.BatchProcessor;
import de.learnlib.api.query.DefaultQuery;
import de.learnlib.api.query.Query;
import net.automatalib.automaton.fsa.DFA;
import net.automatalib.automaton.transducer.MealyMachine;
import net.automatalib.automaton.transducer.MooreMachine;
import net.automatalib.word.Word;

/**
 * Membership oracle interface. A membership oracle provides an elementary abstraction to a System Under Learning (SUL),
 * by allowing to pose {@link Query queries}: A query is a sequence of input symbols (divided into a prefix and a suffix
 * part, cf. {@link Query#getPrefix()} and {@link Query#getSuffix()}) in reaction to which the SUL produces a specific
 * observable behavior (outputting a word, acceptance/rejection etc.).
 *
 * @see DefaultQuery
 */
public interface MembershipOracle<I, D> extends QueryAnswerer<I, D>, BatchProcessor<Query<I, D>> {

    @Override
    default D answerQuery(Word<I> input) {
        return answerQuery(Word.epsilon(), input);
    }

    @Override
    default D answerQuery(Word<I> prefix, Word<I> suffix) {
        DefaultQuery<I, D> query = new DefaultQuery<>(prefix, suffix);
        processQuery(query);
        return query.getOutput();
    }

    /**
     * Processes a single query. When this method returns, the {@link Query#answer(Object)} method of the supplied
     * object will have been called with an argument reflecting the SUL response to the respective query.
     * <p>
     * The default implementation of this method will simply wrap the provided {@link Query} in a singleton {@link
     * Collection} using {@link Collections#singleton(Object)}. Implementations in subclasses should override this
     * method to circumvent the Collection object creation, if possible.
     *
     * @param query
     *         the query to process
     */
    default void processQuery(Query<I, D> query) {
        processQueries(Collections.singleton(query));
    }

    /**
     * Processes the specified collection of queries. When this method returns, each of the contained queries {@link
     * Query#answer(Object)} method should have been called with an argument reflecting the SUL response to the
     * respective query.
     *
     * @param queries
     *         the queries to process
     *
     * @see Query#answer(Object)
     */
    void processQueries(Collection<? extends Query<I, D>> queries);

    @Override
    default MembershipOracle<I, D> asOracle() {
        return this;
    }

    @Override
    default void processBatch(Collection<? extends Query<I, D>> batch) {
        processQueries(batch);
    }

    /**
     * A specialization of the {@link MembershipOracle} that binds the output domain to {@link Boolean}s. Queries should
     * be answered according to the semantics of acceptors such as {@link DFA}s. This means an input sequence of length
     * {@code n} results in a single boolean output.
     *
     * @param <I>
     *         input symbol type
     */
    interface DFAMembershipOracle<I> extends MembershipOracle<I, Boolean> {}

    /**
     * A specialization of the {@link MembershipOracle} that binds the output domain to {@link Word}s of the specified
     * output type. Queries should be answered according to the semantics of transition-output systems such as
     * {@link MealyMachine}s. This means an input sequence of length {@code n} results in an output word of length
     * {@code n}.
     *
     * @param <I>
     *         input symbol type
     * @param <O>
     *         output symbol type
     */
    interface MealyMembershipOracle<I, O> extends MembershipOracle<I, Word<O>> {}

    /**
     * A specialization of the {@link MembershipOracle} that binds the output domain to {@link Word}s of the specified
     * output type. Queries should be answered according to the semantics of state-output systems such as
     * {@link MooreMachine}s. This means an input sequence of length {@code n} results in an output word of length
     * {@code n+1}.
     *
     * @param <I>
     *         input symbol type
     * @param <O>
     *         output symbol type
     */
    interface MooreMembershipOracle<I, O> extends MembershipOracle<I, Word<O>> {}

}

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.api.oracle;
17
18	import java.util.Collection;
19	import java.util.Collections;
20
21	import de.learnlib.api.oracle.parallelism.BatchProcessor;
22	import de.learnlib.api.query.DefaultQuery;
23	import de.learnlib.api.query.Query;
24	import net.automatalib.automaton.fsa.DFA;
25	import net.automatalib.automaton.transducer.MealyMachine;
26	import net.automatalib.automaton.transducer.MooreMachine;
27	import net.automatalib.word.Word;
28
29	/**
30	* Membership oracle interface. A membership oracle provides an elementary abstraction to a System Under Learning (SUL),
31	* by allowing to pose {@link Query queries}: A query is a sequence of input symbols (divided into a prefix and a suffix
32	* part, cf. {@link Query#getPrefix()} and {@link Query#getSuffix()}) in reaction to which the SUL produces a specific
33	* observable behavior (outputting a word, acceptance/rejection etc.).
34	*
35	* @see DefaultQuery
36	*/
37	public interface MembershipOracle<I, D> extends QueryAnswerer<I, D>, BatchProcessor<Query<I, D>> {
38
39	@Override
40	default D answerQuery(Word<I> input) {
41	return answerQuery(Word.epsilon(), input);	1✔
42	}
43
44	@Override
45	default D answerQuery(Word<I> prefix, Word<I> suffix) {
46	DefaultQuery<I, D> query = new DefaultQuery<>(prefix, suffix);	1✔
47	processQuery(query);	1✔
48	return query.getOutput();	1✔
49	}
50
51	/**
52	* Processes a single query. When this method returns, the {@link Query#answer(Object)} method of the supplied
53	* object will have been called with an argument reflecting the SUL response to the respective query.
54	* <p>
55	* The default implementation of this method will simply wrap the provided {@link Query} in a singleton {@link
56	* Collection} using {@link Collections#singleton(Object)}. Implementations in subclasses should override this
57	* method to circumvent the Collection object creation, if possible.
58	*
59	* @param query
60	* the query to process
61	*/
62	default void processQuery(Query<I, D> query) {
63	processQueries(Collections.singleton(query));	1✔
64	}	1✔
65
66	/**
67	* Processes the specified collection of queries. When this method returns, each of the contained queries {@link
68	* Query#answer(Object)} method should have been called with an argument reflecting the SUL response to the
69	* respective query.
70	*
71	* @param queries
72	* the queries to process
73	*
74	* @see Query#answer(Object)
75	*/
76	void processQueries(Collection<? extends Query<I, D>> queries);
77
78	@Override
79	default MembershipOracle<I, D> asOracle() {
80	return this;	×
81	}
82
83	@Override
84	default void processBatch(Collection<? extends Query<I, D>> batch) {
85	processQueries(batch);	1✔
86	}	1✔
87
88	/**
89	* A specialization of the {@link MembershipOracle} that binds the output domain to {@link Boolean}s. Queries should
90	* be answered according to the semantics of acceptors such as {@link DFA}s. This means an input sequence of length
91	* {@code n} results in a single boolean output.
92	*
93	* @param <I>
94	* input symbol type
95	*/
96	interface DFAMembershipOracle<I> extends MembershipOracle<I, Boolean> {}
97
98	/**
99	* A specialization of the {@link MembershipOracle} that binds the output domain to {@link Word}s of the specified
100	* output type. Queries should be answered according to the semantics of transition-output systems such as
101	* {@link MealyMachine}s. This means an input sequence of length {@code n} results in an output word of length
102	* {@code n}.
103	*
104	* @param <I>
105	* input symbol type
106	* @param <O>
107	* output symbol type
108	*/
109	interface MealyMembershipOracle<I, O> extends MembershipOracle<I, Word<O>> {}
110
111	/**
112	* A specialization of the {@link MembershipOracle} that binds the output domain to {@link Word}s of the specified
113	* output type. Queries should be answered according to the semantics of state-output systems such as
114	* {@link MooreMachine}s. This means an input sequence of length {@code n} results in an output word of length
115	* {@code n+1}.
116	*
117	* @param <I>
118	* input symbol type
119	* @param <O>
120	* output symbol type
121	*/
122	interface MooreMembershipOracle<I, O> extends MembershipOracle<I, Word<O>> {}
123
124	}

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