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:
amesbah@google.com (Ali Mesbah)
See Also:

  • Constructor Details

    • LambdaFunctionalInterface

      public LambdaFunctionalInterface()

  • Method Details

    • 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