net.sf.mmm.util.reflect.impl

Class SimpleGenericTypeImpl<T>

java.lang.Object

net.sf.mmm.util.reflect.base.AbstractGenericType<T>

net.sf.mmm.util.reflect.impl.SimpleGenericTypeImpl<T>

Type Parameters:

T - is the templated type of the upper bound.

All Implemented Interfaces:

Type, GenericType<T>

public class SimpleGenericTypeImpl<T>
extends AbstractGenericType<T>

This is an implementation of the GenericType interface for a simple Class.

Since:

1.0.1

Author:

Joerg Hohwiller (hohwille at users.sourceforge.net)

Field Summary

Fields

Modifier and Type	Field and Description
private GenericType<?>	componentType
private GenericType<?>	keyType
private Class<T>	type
static GenericType<?>	TYPE_INT The GenericType for int.
static GenericType<Object>	TYPE_OBJECT The GenericType for Object.
static GenericType<?>	TYPE_VOID The GenericType for void.

Fields inherited from interface net.sf.mmm.util.reflect.api.GenericType

NO_TYPES

Constructor Summary

Constructors

Constructor and Description
SimpleGenericTypeImpl(Class<T> type) The constructor.

Method Summary

Modifier and Type	Method and Description
protected GenericType<?>	create(Type genericType) This method creates the GenericType that encapsulates the given type.
Class<T>	getAssignmentClass() This method gets the Class to be used for assignment (as parameter) of a value of this GenericType.
GenericType<?>	getComponentType() This method gets the component-type of this GenericType if it represents an array, Collection or Map.
GenericType<?>	getDefiningType() This method gets the defining type.
GenericType<?>	getKeyType() This method gets the key-type of this GenericType if it represents a Map.
Class<T>	getRetrievalClass() This method gets the Class to be used for retrieval (the return-type) of a value of this GenericType.
Type	getType() This method gets the Type represented by this GenericType.
GenericType<?>	getTypeArgument(int index) This method gets the type-argument at the given index.
int	getTypeArgumentCount() This method gets the number of type-arguments .

Methods inherited from class net.sf.mmm.util.reflect.base.AbstractGenericType

equals, getDeclarationIndex, getGenericDeclarations, hashCode, isAssignableFrom, isCollection, isMap, resolveTypeVariable, toString, toStringSimple, wrap

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.reflect.Type

getTypeName

Field Detail

TYPE_OBJECT

public static final GenericType<Object> TYPE_OBJECT

The GenericType for Object.

TYPE_VOID

public static final GenericType<?> TYPE_VOID

The GenericType for void.

TYPE_INT

public static final GenericType<?> TYPE_INT

The GenericType for int.

type

private final Class<T> type

componentType

private GenericType<?> componentType

keyType

private GenericType<?> keyType

Constructor Detail

SimpleGenericTypeImpl

public SimpleGenericTypeImpl(Class<T> type)

The constructor.

Parameters:

type - is the type to represent.

Method Detail

create

protected GenericType<?> create(Type genericType)

Description copied from class: AbstractGenericType

This method creates the GenericType that encapsulates the given type.

Specified by:

create in class AbstractGenericType<T>

Parameters:

genericType - is the Type to get as GenericType.

Returns:

the according GenericType.

See Also:

GenericTypeFactory.createGenericType(Type)

getDefiningType

public GenericType<?> getDefiningType()

Description copied from class: AbstractGenericType

This method gets the defining type. This will typically be the Class where the type of this GenericType was retrieved from as parameter, return-type or field-type.

Specified by:

getDefiningType in class AbstractGenericType<T>

Returns:

the defining type or null if NOT available.

getComponentType

public GenericType<?> getComponentType()

Description copied from interface: GenericType

This method gets the component-type of this GenericType if it represents an array, Collection or Map.
Here are some examples:

type	GenericType.getComponentType()
List<Map<String, Long>>	Map<String, Long>
List	Object
Foo[]	Foo
Foo<Bar>[]	Foo<Bar>
Foo<Bar>	null
Map<String, Long>	Long

Returns:

the component-type of this GenericType or null if this GenericType does NOT represent an array, Collection or Map.

getKeyType

public GenericType<?> getKeyType()

Description copied from interface: GenericType

This method gets the key-type of this GenericType if it represents a Map.
Here are some examples:

type	GenericType.getComponentType()
List<Map<String, Long>>	null
Map	Object
Foo[]	null
Foo<K,V>	null
Map<String, Long>	String
HashMap<? extends Number, Long>	? extends Number

Returns:

the key-type of this GenericType or null if this GenericType does NOT represent a Map.

getType

public Type getType()

Description copied from interface: GenericType

This method gets the Type represented by this GenericType.

Returns:

the value-type.

See Also:

Class.getGenericSuperclass(), Class.getGenericInterfaces(), Method.getGenericReturnType(), Method.getGenericParameterTypes(), Field.getGenericType(), Constructor.getGenericParameterTypes()

getAssignmentClass

public Class<T> getAssignmentClass()

Description copied from interface: GenericType

This method gets the Class to be used for assignment (as parameter) of a value of this GenericType.
It will only differ from the retrieval-class if this GenericType is a WildcardType.
Unlike the lower-bound, the assignment-class is never null. If there is no lower-bound, the assignment-class is the same as the retrieval-class. Therefore the assignment-class is always equal or more specific to the retrieval-class.
Here are some examples:

Type	GenericType.getAssignmentClass()
<? super Integer>	Integer
<? extends CharSequence>	CharSequence
String	String

Returns:

the Class that is the lower bound.

getRetrievalClass

public Class<T> getRetrievalClass()

Description copied from interface: GenericType

This method gets the Class to be used for retrieval (the return-type) of a value of this GenericType.
It will only differ from the assignment-class if this GenericType is a WildcardType.
The retrieval-class is the upper-bound, however for usability and simplicity only one bound is supported.
Here are some examples:

Type	GenericType.getAssignmentClass()
<? super Integer>	Object
<? extends CharSequence>	CharSequence
String	String

Returns:

the Class that is the upper bound.

getTypeArgument

public GenericType<?> getTypeArgument(int index)

Description copied from interface: GenericType

This method gets the type-argument at the given index.
E.g. for the GenericType representing Map<String, List<Integer>> this method would return String for an index of 0 and List<Integer> for an index of 1.

Parameters:

index - is the position of the requested type-argument. It has to be in the range from 0 to GenericType.getTypeArgumentCount() - 1.

Returns:

the type-argument at the given index.

See Also:

GenericType.getTypeArgumentCount(), ParameterizedType.getActualTypeArguments()

getTypeArgumentCount

public int getTypeArgumentCount()

Description copied from interface: GenericType

This method gets the number of type-arguments .

Returns:

the type-argument count.