Package com.google.errorprone.bugpatterns

Class LambdaFunctionalInterface

java.lang.Object

com.google.errorprone.bugpatterns.BugChecker

com.google.errorprone.bugpatterns.LambdaFunctionalInterface

All Implemented Interfaces:

BugChecker.MethodTreeMatcher, Suppressible, Serializable

public class LambdaFunctionalInterface
extends BugChecker
implements BugChecker.MethodTreeMatcher

Author:

[email protected] (Ali Mesbah)

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.google.errorprone.bugpatterns.BugChecker

BugChecker.AnnotatedTypeTreeMatcher, BugChecker.AnnotationTreeMatcher, BugChecker.ArrayAccessTreeMatcher, BugChecker.ArrayTypeTreeMatcher, BugChecker.AssertTreeMatcher, BugChecker.AssignmentTreeMatcher, BugChecker.BinaryTreeMatcher, BugChecker.BlockTreeMatcher, BugChecker.BreakTreeMatcher, BugChecker.CaseTreeMatcher, BugChecker.CatchTreeMatcher, BugChecker.ClassTreeMatcher, BugChecker.CompilationUnitTreeMatcher, BugChecker.CompoundAssignmentTreeMatcher, BugChecker.ConditionalExpressionTreeMatcher, BugChecker.ContinueTreeMatcher, BugChecker.DoWhileLoopTreeMatcher, BugChecker.EmptyStatementTreeMatcher, BugChecker.EnhancedForLoopTreeMatcher, BugChecker.ExpressionStatementTreeMatcher, BugChecker.ForLoopTreeMatcher, BugChecker.IdentifierTreeMatcher, BugChecker.IfTreeMatcher, BugChecker.ImportTreeMatcher, BugChecker.InstanceOfTreeMatcher, BugChecker.IntersectionTypeTreeMatcher, BugChecker.LabeledStatementTreeMatcher, BugChecker.LambdaExpressionTreeMatcher, BugChecker.LiteralTreeMatcher, BugChecker.MemberReferenceTreeMatcher, BugChecker.MemberSelectTreeMatcher, BugChecker.MethodInvocationTreeMatcher, BugChecker.MethodTreeMatcher, BugChecker.ModifiersTreeMatcher, BugChecker.NewArrayTreeMatcher, BugChecker.NewClassTreeMatcher, BugChecker.ParameterizedTypeTreeMatcher, BugChecker.ParenthesizedTreeMatcher, BugChecker.PrimitiveTypeTreeMatcher, BugChecker.ReturnTreeMatcher, BugChecker.SuppressibleTreePathScanner<A extends Object,B extends Object>, BugChecker.SwitchTreeMatcher, BugChecker.SynchronizedTreeMatcher, BugChecker.ThrowTreeMatcher, BugChecker.TryTreeMatcher, BugChecker.TypeCastTreeMatcher, BugChecker.TypeParameterTreeMatcher, BugChecker.UnaryTreeMatcher, BugChecker.UnionTypeTreeMatcher, BugChecker.VariableTreeMatcher, BugChecker.WhileLoopTreeMatcher, BugChecker.WildcardTreeMatcher

Constructor Summary

Constructors

Constructor	Description
LambdaFunctionalInterface()

Method Summary

Modifier and Type	Method	Description
Description	matchMethod(com.sun.source.tree.MethodTree tree, VisitorState state)	Identifies methods with parameters that have a generic argument with Int, Long, or Double.

Methods inherited from class com.google.errorprone.bugpatterns.BugChecker

allNames, buildDescription, buildDescription, buildDescription, canonicalName, customSuppressionAnnotations, defaultSeverity, describeMatch, describeMatch, describeMatch, describeMatch, describeMatch, describeMatch, disableable, equals, hashCode, isSuppressed, isSuppressed, isSuppressed, isSuppressed, linkUrl, message, supportsSuppressWarnings, suppressedByAnyOf, suppressedRegions

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.errorprone.matchers.Suppressible

allNames, canonicalName, customSuppressionAnnotations, supportsSuppressWarnings, suppressedByAnyOf

Constructor Detail

LambdaFunctionalInterface

public LambdaFunctionalInterface()

Method Detail

matchMethod

public Description matchMethod(com.sun.source.tree.MethodTree tree,
                               VisitorState state)

Identifies methods with parameters that have a generic argument with Int, Long, or Double. If pre-conditions are met, it refactors them to the primitive specializations.

PreConditions:
 (1): The method declaration has to be private (to do a safe refactoring)
 (2): Its parameters have to meet the following conditions:
    2.1 Contain type java.util.function.Function
    2.2 At least one argument type of the Function must be subtype of Number
 (3): All its invocations in the top-level enclosing class have to meet the following
 conditions as well:
    3.1: lambda argument of Kind.LAMBDA_EXPRESSION
    3.2: same as 2.1
    3.3: same as 2.2
 

 Refactoring Changes for matched methods:
 (1) Add the imports
 (2) Change the method signature to use utility function instead of Function
 (3) Find and change the 'apply' calls to the corresponding applyAsT
 

Specified by:

matchMethod in interface BugChecker.MethodTreeMatcher