com.fasterxml.jackson.core.type
Class TypeReference<T>

java.lang.Object
  extended by com.fasterxml.jackson.core.type.TypeReference<T>
All Implemented Interfaces:
Comparable<TypeReference<T>>

public abstract class TypeReference<T>
extends Object
implements Comparable<TypeReference<T>>

This generic abstract class is used for obtaining full generics type information by sub-classing; it must be converted to ResolvedType implementation (implemented by JavaType from "databind" bundle) to be used. Class is based on ideas from http://gafter.blogspot.com/2006/12/super-type-tokens.html, Additional idea (from a suggestion made in comments of the article) is to require bogus implementation of Comparable (any such generic interface would do, as long as it forces a method with generic type to be implemented). to ensure that a Type argument is indeed given.

Usage is by sub-classing: here is one way to instantiate reference to generic type List<Integer>:

  TypeReference ref = new TypeReference<List<Integer>>() { };
which can be passed to methods that accept TypeReference, or resolved using TypeFactory to obtain ResolvedType.


Field Summary
protected  Type _type
           
 
Constructor Summary
protected TypeReference()
           
 
Method Summary
 int compareTo(TypeReference<T> o)
          The only reason we define this method (and require implementation of Comparable) is to prevent constructing a reference without type information.
 Type getType()
           
 
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
Constructor Detail

TypeReference

protected TypeReference()
Method Detail

getType

public Type getType()

compareTo

public int compareTo(TypeReference<T> o)
The only reason we define this method (and require implementation of Comparable) is to prevent constructing a reference without type information.

Specified by:
compareTo in interface Comparable<TypeReference<T>>


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