org.osgl.util

Class TypeReference<T>

java.lang.Object

org.osgl.util.TypeReference<T>

public class TypeReference<T>
extends Object

Note the source code is copied from com.alibaba.fastjson.TypeReference

Represents a generic type T. Java doesn’t yet provide a way to represent generic types, so this class does. Forces clients to create a subclass of this class which enables retrieval the type information even at runtime.

For example, to create a type literal for List<String>, you can create an empty anonymous inner class:

TypeReference<List<String>> list = new TypeReference<List<String>>() {};

To create a generic list of type with given class:

Type type = TypeReference.listOf(clazz);

This syntax cannot be used to create type literals that have wildcard parameters, such as Class<?> or List<? extends CharSequence>.

Field Summary

Fields

Modifier and Type	Field and Description
static Type	LIST_STRING
protected Type	type

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	TypeReference() Constructs a new type literal.

Method Summary

Modifier and Type	Method and Description
static Type	collectionOf(Class<?> elementType)
Type	getType() Gets underlying Type instance.
static Type	IterableOf(Class<?> elementType)
static Type	listOf(Class<?> elementType)
static Type	mapOf(Class<?> keyType, Class<?> valType)
static Type	setOf(Class<?> elementType)

Methods inherited from class java.lang.Object

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

Field Detail

type

protected final Type type

LIST_STRING

public static final Type LIST_STRING

Constructor Detail

TypeReference

protected TypeReference()

Constructs a new type literal. Derives represented class from type parameter.

Clients create an empty anonymous subclass. Doing so embeds the type parameter in the anonymous class’s type hierarchy so we can reconstitute it at runtime despite erasure.

Method Detail

getType

public Type getType()

Gets underlying Type instance.

listOf

public static Type listOf(Class<?> elementType)

setOf

public static Type setOf(Class<?> elementType)

collectionOf

public static Type collectionOf(Class<?> elementType)

mapOf

public static Type mapOf(Class<?> keyType,
                         Class<?> valType)

IterableOf

public static Type IterableOf(Class<?> elementType)