com.alibaba.fastjson

Class TypeReference<T>

java.lang.Object

com.alibaba.fastjson.TypeReference<T>

public class TypeReference<T>
extends java.lang.Object

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>>() {};
 

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
(package private) static java.util.concurrent.ConcurrentMap<java.lang.reflect.Type,java.lang.reflect.Type>	classTypeCache
protected java.lang.reflect.Type	type

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	TypeReference() Constructs a new type literal.
protected	TypeReference(java.lang.reflect.Type... actualTypeArguments)

Method Summary

Modifier and Type	Method and Description
java.lang.reflect.Type	getType() Gets underlying Type instance.
private java.lang.reflect.Type	handlerParameterizedType(java.lang.reflect.ParameterizedType type, java.lang.reflect.Type[] actualTypeArguments, int actualIndex)
static java.lang.reflect.Type	intern(ParameterizedTypeImpl type)

Methods inherited from class java.lang.Object

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

Field Detail

classTypeCache

static java.util.concurrent.ConcurrentMap<java.lang.reflect.Type,java.lang.reflect.Type> classTypeCache

type

protected final java.lang.reflect.Type type

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.

TypeReference

protected TypeReference(java.lang.reflect.Type... actualTypeArguments)

Since:

1.2.9

Method Detail

handlerParameterizedType

private java.lang.reflect.Type handlerParameterizedType(java.lang.reflect.ParameterizedType type,
                                                        java.lang.reflect.Type[] actualTypeArguments,
                                                        int actualIndex)

getType

public java.lang.reflect.Type getType()

Gets underlying Type instance.

intern

public static java.lang.reflect.Type intern(ParameterizedTypeImpl type)