com.fasterxml.jackson.core.type
Class TypeReference<T>
java.lang.Object
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
.
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 |
_type
protected final Type _type
TypeReference
protected TypeReference()
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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