Package org.codehaus.jackson.type
Class TypeReference<T>
- java.lang.Object
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- org.codehaus.jackson.type.TypeReference<T>
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- All Implemented Interfaces:
java.lang.Comparable<TypeReference<T>>
public abstract class TypeReference<T> extends java.lang.Object implements java.lang.Comparable<TypeReference<T>>
This class is used to pass full generics type information, and avoid problems with type erasure (that basically removes most usable type references from runtime Class objects). It 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 ofComparable
(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.
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Constructor Summary
Constructors Modifier Constructor Description protected
TypeReference()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
compareTo(TypeReference<T> o)
The only reason we define this method (and require implementation ofComparable
) is to prevent constructing a reference without type information.java.lang.reflect.Type
getType()
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Method Detail
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getType
public java.lang.reflect.Type getType()
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compareTo
public int compareTo(TypeReference<T> o)
The only reason we define this method (and require implementation ofComparable
) is to prevent constructing a reference without type information.- Specified by:
compareTo
in interfacejava.lang.Comparable<T>
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