Oracle® Fusion Middleware C++ API Reference for Oracle Coherence
12c (12.2.1.2.0)
E77779-01

ValueExtractor Class Reference

#include <coherence/util/ValueExtractor.hpp>

Inherits Object.

Inherited by NullImplementation::NullValueExtractor [virtual].

List of all members.

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Detailed Description

ValueExtractor is used to both extract values (for example, for sorting or filtering) from an object, and to provide an identity for that extraction.

Important Note: all classes that implement the ValueExtractor interface must explicitly implement the Object::hashCode() and Object::equals methods in a way that is based solely on the object's serializable state.

Author:

jh 2008.02.26

Public Types
typedef spec::Handle	Handle
	ValueExtractor Handle definition.
typedef spec::View	View
	ValueExtractor View definition.
typedef spec::Holder	Holder
	ValueExtractor Holder definition.
Public Member Functions
virtual Object::Holder	extract (Object::Holder ohTarget) const =0
	Extract the value from the passed object.

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Member Function Documentation

virtual Object::Holder extract

(

Object::Holder

ohTarget

)

const [pure virtual]

Extract the value from the passed object.

The returned value may be NULL.

Parameters:

ohTarget

an Object to retrieve the value from

Returns:

the extracted value; NULL is an acceptable value

Exceptions:

	ClassCastException	if this ValueExtractor is incompatible with the passed object to extract a value from and the implementation requires the passed object to be of a certain type
	Exception	if this ValueExtractor encounters an exception in the course of extracting the value
	IllegalArgumentException	if this ValueExtractor cannot handle the passed object for any other reason; an implementor should include a descriptive message

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The documentation for this class was generated from the following file:

• coherence/util/ValueExtractor.hpp

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