Package de.learnlib.oracle.equivalence

Class WMethodEQOracle<A extends UniversalDeterministicAutomaton<?,I,?,?,?> & Output<I,D>,I,D>

java.lang.Object

de.learnlib.oracle.equivalence.AbstractTestWordEQOracle<A,I,D>

de.learnlib.oracle.equivalence.WMethodEQOracle<A,I,D>

Type Parameters:

A - automaton type

I - input symbol type

D - output domain type

All Implemented Interfaces:

EquivalenceOracle<A,I,D>

Direct Known Subclasses:

DFAWMethodEQOracle, MealyWMethodEQOracle, MooreWMethodEQOracle

public class WMethodEQOracle<A extends UniversalDeterministicAutomaton<?,I,?,?,?> & Output<I,D>,I,D>
extends AbstractTestWordEQOracle<A,I,D>

Implements an equivalence test by applying the W-method test on the given hypothesis automaton, as described in "Testing software design modeled by finite state machines" by T.S. Chow.

Nested Class Summary

Nested classes/interfaces inherited from interface de.learnlib.oracle.EquivalenceOracle

EquivalenceOracle.DFAEquivalenceOracle<I>, EquivalenceOracle.MealyEquivalenceOracle<I,O>, EquivalenceOracle.MooreEquivalenceOracle<I,O>

Constructor Summary

Constructors

Constructor	Description
WMethodEQOracle(MembershipOracle<I,D> sulOracle, int lookahead)	Constructor.
WMethodEQOracle(MembershipOracle<I,D> sulOracle, int lookahead, int expectedSize)	Constructor.
WMethodEQOracle(MembershipOracle<I,D> sulOracle, int lookahead, int expectedSize, int batchSize)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected Stream<Word<I>>	generateTestWords(A hypothesis, Collection<? extends I> inputs)	Generate the stream of test words that should be used for the current equivalence check cycle.

Methods inherited from class de.learnlib.oracle.equivalence.AbstractTestWordEQOracle

findCounterExample

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WMethodEQOracle

public WMethodEQOracle(MembershipOracle<I,D> sulOracle,
                       int lookahead)

Constructor. Convenience method for WMethodEQOracle(MembershipOracle, int, int) that sets expectedSize to 0.

Parameters:

sulOracle - interface to the system under learning

lookahead - the maximum length of the "middle" part of the test cases

WMethodEQOracle

public WMethodEQOracle(MembershipOracle<I,D> sulOracle,
                       int lookahead,
                       int expectedSize)

Constructor. Convenience method for WMethodEQOracle(MembershipOracle, int, int, int) that sets batchSize to 1.

Parameters:

sulOracle - interface to the system under learning

lookahead - the (minimal) maximum length of the "middle" part of the test cases

expectedSize - the expected size of the system under learning

WMethodEQOracle

public WMethodEQOracle(MembershipOracle<I,D> sulOracle,
                       int lookahead,
                       int expectedSize,
                       int batchSize)

Constructor. Uses Math.max(lookahead, expectedSize - hypothesis.size()) to determine the maximum length of sequences, that should be appended to the transition-cover part of the test sequence to account for the fact that the system under learning may have more states than the current hypothesis.

Parameters:

sulOracle - interface to the system under learning

lookahead - the (minimal) maximum length of the "middle" part of the test cases

expectedSize - the expected size of the system under learning

batchSize - size of the batches sent to the membership oracle

See Also:

WMethodTestsIterator

Method Detail

generateTestWords

protected Stream<Word<I>> generateTestWords(A hypothesis,
                                            Collection<? extends I> inputs)

Description copied from class: AbstractTestWordEQOracle

Generate the stream of test words that should be used for the current equivalence check cycle.

Specified by:

generateTestWords in class AbstractTestWordEQOracle<A extends UniversalDeterministicAutomaton<?,I,?,?,?> & Output<I,D>,I,D>

Parameters:

hypothesis - the current hypothesis of the learning algorithm

inputs - the collection of inputs to consider

Returns:

the stream of test words used for equivalence testing

See Also:

EquivalenceOracle.findCounterExample(Object, Collection)