org.codehaus.groovy.ast.tools
[Java] Class GenericsUtils

java.lang.Object
  org.codehaus.groovy.ast.tools.GenericsUtils

public class GenericsUtils
extends Object

Utility methods to deal with generic types.

Authors:

Cedric Champeau

EMPTY_GENERICS_ARRAY

public static final GenericsType[] EMPTY_GENERICS_ARRAY

alignGenericTypes

public static GenericsType[] alignGenericTypes(GenericsType[] redirectGenericTypes, GenericsType[] parameterizedTypes, GenericsType[] alignmentTarget)

Given a parameterized type and a generic type information, aligns actual type parameters. For example, if a class uses generic type

<T,U,V>

(redirectGenericTypes), is used with actual type parameters

<java.lang.String, U,V>

, then a class or interface using generic types

<T,V>

will be aligned to

<java.lang.String,V>

Parameters:

redirectGenericTypes - the type arguments or the redirect class node

parameterizedTypes - the actual type arguments used on this class node

alignmentTarget - the generic type arguments to which we want to align to

Returns:

aligned type arguments

buildWildcardType

public static GenericsType buildWildcardType(ClassNode... types)

Generates a wildcard generic type in order to be used for checks against class nodes. See GenericsType#isCompatibleWith(org.codehaus.groovy.ast.ClassNode).

Parameters:

types - the type to be used as the wildcard upper bound

Returns:

a wildcard generics type

extractPlaceholders

public static Map extractPlaceholders(ClassNode cn)

extractPlaceholders

public static void extractPlaceholders(ClassNode node, Map map)

For a given classnode, fills in the supplied map with the parameterized types it defines.

Parameters:

node

map

parameterizeInterfaceGenerics

public static ClassNode parameterizeInterfaceGenerics(ClassNode hint, ClassNode target)

Interface class nodes retrieved from ClassNode.getInterfaces or ClassNode.getAllInterfaces are returned with generic type arguments. This method allows returning a parameterized interface given the parameterized class node which implements this interface.

deprecated:

Use #parameterizeType instead

Parameters:

hint - the class node where generics types are parameterized

target - the interface we want to parameterize generics types

Returns:

a parameterized interface class node

parameterizeType

public static ClassNode parameterizeType(ClassNode hint, ClassNode target)

Interface class nodes retrieved from ClassNode.getInterfaces or ClassNode.getAllInterfaces are returned with generic type arguments. This method allows returning a parameterized interface given the parameterized class node which implements this interface.

Parameters:

hint - the class node where generics types are parameterized

target - the interface we want to parameterize generics types

Returns:

a parameterized interface class node

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