randoop.generation

Class GrtNumericFuzzer

java.lang.Object

randoop.generation.GrtFuzzer

randoop.generation.GrtNumericFuzzer

public final class GrtNumericFuzzer
extends GrtFuzzer

Fuzzer for primitive numeric values and char. Samples a Gaussian delta g ~ N(0,sigma^2) (sigma configurable via GenInputsAbstract.grt_fuzzing_stddev), and adds it to the original.

Field Summary

Fields

Modifier and Type	Field and Description
private static GrtNumericFuzzer	INSTANCE Singleton instance.

Fields inherited from class randoop.generation.GrtFuzzer

NEGATIVE_INDEX_CACHE

Constructor Summary

Constructors

Modifier	Constructor and Description
private	GrtNumericFuzzer() Private constructor to enforce singleton.

Method Summary

Modifier and Type	Method and Description
boolean	canFuzz(Type type) Returns true if this fuzzer can handle the type.
Sequence	fuzz(Sequence sequence) Appends fuzzing statements to sequence.
static GrtNumericFuzzer	getInstance() Obtain the singleton instance of GrtNumericFuzzer.
private static java.lang.Object	sampleMutatedValue(Type type, java.lang.Number orig) Sample g ~ N(0,sigma^2), add to orig.doubleValue(), and cast to the right type.

Methods inherited from class randoop.generation.GrtFuzzer

getFuzzer, getRelativeNegativeIndices

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

private static final GrtNumericFuzzer INSTANCE

Singleton instance.

Constructor Detail

GrtNumericFuzzer

private GrtNumericFuzzer()

Private constructor to enforce singleton.

Method Detail

getInstance

public static GrtNumericFuzzer getInstance()

Obtain the singleton instance of GrtNumericFuzzer.

Returns:

the singleton instance

canFuzz

public boolean canFuzz(Type type)

Description copied from class: GrtFuzzer

Returns true if this fuzzer can handle the type.

Specified by:

canFuzz in class GrtFuzzer

Parameters:

type - the type to check

Returns:

true if this fuzzer can handle the type

fuzz

public Sequence fuzz(Sequence sequence)

Description copied from class: GrtFuzzer

Appends fuzzing statements to sequence. If the type is unsupported by this fuzzer, the implementation throws an exception.

Specified by:

fuzz in class GrtFuzzer

Parameters:

sequence - the sequence whose last value will be fuzzed

Returns:

a new sequence with additional fuzzing statements, or the original sequence if no fuzzing was performed

sampleMutatedValue

private static java.lang.Object sampleMutatedValue(Type type,
                                                   java.lang.Number orig)

Sample g ~ N(0,sigma^2), add to orig.doubleValue(), and cast to the right type. Does not return Number because the result may be a Character.

Parameters:

type - the type of the value to fuzz

orig - the original value

Returns:

the fuzzed value