io.micronaut.annotation.processing

Class GenericUtils

java.lang.Object

io.micronaut.annotation.processing.GenericUtils

@Internal
public class GenericUtils
extends Object

Utility methods for dealing with generic type signatures.

Author:

Graeme Rocher

Method Summary

Modifier and Type	Method and Description
protected Optional<TypeMirror>	getFirstTypeArgument(TypeMirror type) Return the first type argument for the given type mirror.
protected TypeMirror	interfaceGenericTypeFor(TypeElement element, Class interfaceType) Finds the generic type for the given interface for the given class element.
protected TypeMirror	interfaceGenericTypeFor(TypeElement element, String interfaceName) Finds the generic type for the given interface for the given class element.
List<? extends TypeMirror>	interfaceGenericTypesFor(TypeElement element, String interfaceName) Finds the generic types for the given interface for the given class element.
protected Map<String,Object>	resolveBoundTypes(DeclaredType type) Resolve bound types for the given declared type.
protected Map<String,Object>	resolveGenericTypes(DeclaredType type, TypeElement typeElement, Map<String,Object> boundTypes) Resolve the generic type arguments for the given type mirror and bound type arguments.
protected Map<String,Object>	resolveGenericTypes(TypeMirror type, Map<String,Object> boundTypes) Resolve the generic type arguments for the given type mirror and bound type arguments.
protected Object	resolveTypeReference(TypeMirror mirror)
protected Object	resolveTypeReference(TypeMirror mirror, Map<String,Object> boundTypes) Resolve a type reference to use for the given type mirror taking into account generic type variables.
protected DeclaredType	resolveTypeVariable(Element element, TypeVariable typeVariable) Resolve the first type argument to a parameterized type.

Methods inherited from class java.lang.Object

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

Method Detail

interfaceGenericTypeFor

protected TypeMirror interfaceGenericTypeFor(TypeElement element,
                                             Class interfaceType)

Finds the generic type for the given interface for the given class element.

For example, for class AProvider implements Provider element = AProvider interfaceType = interface javax.inject.Provider.class return A

Parameters:

element - The class element

interfaceType - The interface

Returns:

The generic type or null

interfaceGenericTypeFor

protected TypeMirror interfaceGenericTypeFor(TypeElement element,
                                             String interfaceName)

Finds the generic type for the given interface for the given class element.

For example, for class AProvider implements Provider<A> element = AProvider interfaceName = interface javax.inject.Provider return A

Parameters:

element - The class element

interfaceName - The interface

Returns:

The generic type or null

interfaceGenericTypesFor

public List<? extends TypeMirror> interfaceGenericTypesFor(TypeElement element,
                                                           String interfaceName)

Finds the generic types for the given interface for the given class element.

Parameters:

element - The class element

interfaceName - The interface

Returns:

The generic types or an empty list

getFirstTypeArgument

protected Optional<TypeMirror> getFirstTypeArgument(TypeMirror type)

Return the first type argument for the given type mirror. For example for Optional<String> this will return String.

Parameters:

type - The type

Returns:

The first argument.

resolveGenericTypes

protected Map<String,Object> resolveGenericTypes(TypeMirror type,
                                                 Map<String,Object> boundTypes)

Resolve the generic type arguments for the given type mirror and bound type arguments.

Parameters:

type - The type mirror

boundTypes - The bound types (such as those declared on the class)

Returns:

A map of generic type arguments

resolveGenericTypes

protected Map<String,Object> resolveGenericTypes(DeclaredType type,
                                                 TypeElement typeElement,
                                                 Map<String,Object> boundTypes)

Resolve the generic type arguments for the given type mirror and bound type arguments.

Parameters:

type - The declaring type

typeElement - The type element

boundTypes - The bound types

Returns:

A map of generic type arguments

resolveTypeReference

protected Object resolveTypeReference(TypeMirror mirror)

Parameters:

mirror - The TypeMirror

Returns:

The resolved type reference

resolveTypeReference

protected Object resolveTypeReference(TypeMirror mirror,
                                      Map<String,Object> boundTypes)

Resolve a type reference to use for the given type mirror taking into account generic type variables.

Parameters:

mirror - The mirror

boundTypes - The already bound types for any type variable

Returns:

A type reference

resolveTypeVariable

protected DeclaredType resolveTypeVariable(Element element,
                                           TypeVariable typeVariable)

Resolve the first type argument to a parameterized type.

Parameters:

element - The type element

typeVariable - The type variable

Returns:

The declaring type

resolveBoundTypes

protected Map<String,Object> resolveBoundTypes(DeclaredType type)

Resolve bound types for the given declared type.

Parameters:

type - The declaring type

Returns:

The type bounds