org.beanfabrics.util
Class GenericType

java.lang.Object
  org.beanfabrics.util.GenericType

public class GenericType
extends java.lang.Object

The GenericType is a facade for a Type object representing a Java class. It provides convenient functions for generic type reflection.

Constructor Summary

GenericType(java.lang.Class<?> cls)
Creates a GenericType for the given Class.

Method Summary

java.lang.Class<?>	asClass() Returns the class that this type represents.
GenericType	getFieldType(java.lang.String fieldname) Returns the type of the field with the given name as a GenericType.
GenericType	getMethodReturnType(java.lang.String methodName) Returns the return type of the method with the given name (having no parameters) as a GenericType.
java.lang.reflect.Type	getType() Returns the type represented by this GenericType.
GenericType	getTypeParameter(java.lang.reflect.TypeVariable<? extends java.lang.Class<?>> variable) Returns the value of the given TypeVariable as a GenericType.
boolean	isClass() Returns true if this type represents a Class.
boolean	isParameterizedType() Returns true if this type represents a ParameterizedType.
boolean	isTypeVariable() Returns true if this type represents a TypeVariable.
boolean	isWildcardType() Returns true if this type represents a WildcardType.
java.lang.reflect.Type	narrow(java.lang.reflect.Type aType, java.lang.Class<?> targetType)
java.lang.reflect.Type	tryResolve(java.lang.reflect.Type type)
java.lang.reflect.Type	tryResolve(java.lang.reflect.TypeVariable<?> var)

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericType

public GenericType(java.lang.Class<?> cls)

Creates a GenericType for the given Class.

Parameters:

cls -

Method Detail

getType

public java.lang.reflect.Type getType()

Returns the type represented by this GenericType. This can be one of Class, ParameterizedType, and TypeVariable.

Returns:

the type represented by this GenericType.

isTypeVariable

public boolean isTypeVariable()

Returns true if this type represents a TypeVariable.

Returns:

true if this type represents a TypeVariable

isClass

public boolean isClass()

Returns true if this type represents a Class.

Returns:

true if this type represents a Class

asClass

public java.lang.Class<?> asClass()
                           throws java.lang.IllegalStateException

Returns the class that this type represents.

Returns:

the class this type represents

Throws:

java.lang.IllegalStateException - if this type does not represent a class

isParameterizedType

public boolean isParameterizedType()

Returns true if this type represents a ParameterizedType.

Returns:

true if this type represents a ParameterizedType

isWildcardType

public boolean isWildcardType()

Returns true if this type represents a WildcardType.

Returns:

true if this type represents a WildcardType

getTypeParameter

public GenericType getTypeParameter(java.lang.reflect.TypeVariable<? extends java.lang.Class<?>> variable)
                             throws java.lang.IllegalArgumentException,
                                    java.lang.IllegalStateException

Returns the value of the given TypeVariable as a GenericType.

Parameters:

variable - must parameterize this type or one of it's super types

Returns:

the actual value of the given TypeVariable as a GenericType

Throws:

java.lang.IllegalArgumentException - if the variable does not parameterize this type

java.lang.UnsupportedOperationException - if the type parameter resolution is not supported for this type

java.lang.IllegalStateException

getFieldType

public GenericType getFieldType(java.lang.String fieldname)

Returns the type of the field with the given name as a GenericType.

Parameters:

fieldname - must denote a field in this type or one of it's super types.

Returns:

the type of the field with the given name as a GenericType

Throws:

java.lang.UnsupportedOperationException - if field type resolution is not supported for this type

getMethodReturnType

public GenericType getMethodReturnType(java.lang.String methodName)

Returns the return type of the method with the given name (having no parameters) as a GenericType.

Please note:
Only methods without parameters are supported right now!

Parameters:

methodName -

Returns:

the return type of the method as a GenericType.

Throws:

java.lang.UnsupportedOperationException - if method return type resolution is not supported for this type

tryResolve

public java.lang.reflect.Type tryResolve(java.lang.reflect.Type type)

tryResolve

public java.lang.reflect.Type tryResolve(java.lang.reflect.TypeVariable<?> var)

narrow

public java.lang.reflect.Type narrow(java.lang.reflect.Type aType,
                                     java.lang.Class<?> targetType)