Class FuzzyBugComparator

java.lang.Object

edu.umd.cs.findbugs.FuzzyBugComparator

All Implemented Interfaces:

WarningComparator, Serializable, Comparator<BugInstance>

public class FuzzyBugComparator
extends Object
implements WarningComparator

A slightly more intellegent way of comparing BugInstances from two versions to see if they are the "same". Uses class and method hashes to try to handle renamings, at least for simple cases. (Hashes disabled for the time being.) Uses opcode context to try to identify code that is the same, even if it moves within the method. Also compares by bug abbreviation rather than bug type, since the "same" bug can change type if the context changes (e.g., "definitely null" to "null on simple path" for a null pointer dereference). Also, we often change bug types between different versions of FindBugs.

See Also:

• BugInstance
• VersionInsensitiveBugComparator
• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	FuzzyBugComparator.FilteringBugAnnotationIterator	Filter ignored BugAnnotations from given Iterator.

Field Summary

Fields

Modifier and Type	Field	Description
private final IdentityHashMap<BugInstance, BugCollection>	bugCollectionMap	Keep track of which BugCollections the various BugInstances have come from.
private ClassNameRewriter	classNameRewriter
private static final boolean	DEBUG
private static final Set<String>	significantDescriptionSet

Constructor Summary

Constructors

Constructor	Description
FuzzyBugComparator()	Map of class hashes to canonical class names used for comparison purposes.

Method Summary

Modifier and Type	Method	Description
int	compare(BugInstance lhs, BugInstance rhs)
int	compareClasses(BugCollection lhsCollection, BugCollection rhsCollection, ClassAnnotation lhsClass, ClassAnnotation rhsClass)
int	compareClassesByName(BugCollection lhsCollection, BugCollection rhsCollection, String lhsClassName, String rhsClassName)
int	compareMethods(BugCollection lhsCollection, BugCollection rhsCollection, MethodAnnotation lhsMethod, MethodAnnotation rhsMethod)
private static int	compareNullElements(Object a, Object b)
int	compareSourceLines(BugCollection lhsCollection, BugCollection rhsCollection, SourceLineAnnotation lhs, SourceLineAnnotation rhs)	Compare source line annotations.
static boolean	ignore(BugAnnotation annotation)
void	registerBugCollection(BugCollection bugCollection)	Register a BugCollection.
private String	rewriteClassName(String className)
void	setClassNameRewriter(ClassNameRewriter classNameRewriter)

Methods inherited from class Object

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

Methods inherited from interface Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Details

DEBUG

private static final boolean DEBUG

See Also:

• Constant Field Values

bugCollectionMap

private final IdentityHashMap<BugInstance, BugCollection> bugCollectionMap

Keep track of which BugCollections the various BugInstances have come from.

classNameRewriter

private ClassNameRewriter classNameRewriter

significantDescriptionSet

@StaticConstant
private static final Set<String> significantDescriptionSet

Constructor Details

FuzzyBugComparator

public FuzzyBugComparator()

Map of class hashes to canonical class names used for comparison purposes.

Method Details

registerBugCollection

public void registerBugCollection(BugCollection bugCollection)

Register a BugCollection. This allows us to find the class and method hashes for BugInstances to be compared.

Parameters:

bugCollection - a BugCollection

setClassNameRewriter

public void setClassNameRewriter(ClassNameRewriter classNameRewriter)

Specified by:

setClassNameRewriter in interface WarningComparator

compare

public int compare(BugInstance lhs,
 BugInstance rhs)

Specified by:

compare in interface Comparator<BugInstance>

Specified by:

compare in interface WarningComparator

compareNullElements

private static int compareNullElements(Object a,
 Object b)

compareClasses

public int compareClasses(BugCollection lhsCollection,
 BugCollection rhsCollection,
 ClassAnnotation lhsClass,
 ClassAnnotation rhsClass)

compareClassesByName

public int compareClassesByName(BugCollection lhsCollection,
 BugCollection rhsCollection,
 String lhsClassName,
 String rhsClassName)

rewriteClassName

private String rewriteClassName(String className)

Parameters:

className -

Returns:

the rewritten class name

compareMethods

public int compareMethods(BugCollection lhsCollection,
 BugCollection rhsCollection,
 MethodAnnotation lhsMethod,
 MethodAnnotation rhsMethod)

compareSourceLines

public int compareSourceLines(BugCollection lhsCollection,
 BugCollection rhsCollection,
 SourceLineAnnotation lhs,
 SourceLineAnnotation rhs)

Compare source line annotations.

Parameters:

lhsCollection - rhs BugCollection

rhsCollection - lhs BugCollection

lhs - a SourceLineAnnotation

rhs - another SourceLineAnnotation

Returns:

comparison of lhs and rhs

ignore

public static boolean ignore(BugAnnotation annotation)