Package groovy.transform.stc

Class PickAnyArgumentHint

java.lang.Object

groovy.transform.stc.ClosureSignatureHint

groovy.transform.stc.SingleSignatureClosureHint

groovy.transform.stc.PickAnyArgumentHint

Direct Known Subclasses:

FirstParam, FirstParam.FirstGenericType, FirstParam.SecondGenericType, FirstParam.ThirdGenericType, SecondParam, SecondParam.FirstGenericType, SecondParam.SecondGenericType, SecondParam.ThirdGenericType, ThirdParam, ThirdParam.FirstGenericType, ThirdParam.SecondGenericType, ThirdParam.ThirdGenericType

public class PickAnyArgumentHint
extends SingleSignatureClosureHint

Base class for hints which use the type of a parameter of the annotated method as the signature. This can optionally use a generic type of the selected parameter as the hint. For example, imagine the following method:

void foo(A firstArg, B secondArg, Closure c) {...}

If the c closure should be { B it -> ...}, then we can see that the parameter type should be picked from the second parameter of the foo method, which is what PickAnyArgumentHint lets you do.

Alternatively, the method may look like this:

void <T> foo(A<T> firstArg, B secondArg, Closure c) {...}

in which case if you want to express the fact that c should accept a <T> then you can use the genericTypeIndex value.

This class is extended by several hint providers that make it easier to use as annotation values.

Since:

2.3.0

Constructor Summary

Constructors

Constructor	Description
PickAnyArgumentHint()	Creates the an argument picker which extracts the type of the first parameter.
PickAnyArgumentHint(int parameterIndex, int genericTypeIndex)	Creates a picker which will extract the parameterIndex-th parameter type, or its genericTypeIndex-th generic type genericTypeIndex is >=0.

Method Summary

Modifier and Type	Method	Description
ClassNode[]	getParameterTypes(MethodNode node, String[] options, SourceUnit sourceUnit, CompilationUnit unit, ASTNode usage)

Methods inherited from class groovy.transform.stc.SingleSignatureClosureHint

getClosureSignatures

Methods inherited from class groovy.transform.stc.ClosureSignatureHint

findClassNode, pickGenericType, pickGenericType

Methods inherited from class java.lang.Object

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

Constructor Detail

PickAnyArgumentHint

public PickAnyArgumentHint()

Creates the an argument picker which extracts the type of the first parameter.

PickAnyArgumentHint

public PickAnyArgumentHint(int parameterIndex,
                           int genericTypeIndex)

Creates a picker which will extract the parameterIndex-th parameter type, or its genericTypeIndex-th generic type genericTypeIndex is >=0.

Parameters:

parameterIndex - the index of the parameter from which to extract the type

genericTypeIndex - if >=0, then returns the corresponding generic type instead of the parameter type.

Method Detail

getParameterTypes

public ClassNode[] getParameterTypes(MethodNode node,
                                     String[] options,
                                     SourceUnit sourceUnit,
                                     CompilationUnit unit,
                                     ASTNode usage)

Specified by:

getParameterTypes in class SingleSignatureClosureHint