Package org.eclipse.persistence.jpa.jpql.utility.filter

Class NullFilter

java.lang.Object

org.eclipse.persistence.jpa.jpql.utility.filter.NullFilter

All Implemented Interfaces:

Filter<Object>

public final class NullFilter
extends Object
implements Filter<Object>

A null implementation of a Filter. The singleton instance can be typed cast properly when using generics.

Version:

2.3

Author:

Pascal Filion

Method Summary

Modifier and Type	Method	Description
boolean	accept(Object value)	Determines whether the specified object is "accepted" by the filter.
static <T> Filter<T>	instance()	Returns the singleton instance of this NullFilter.
String	toString()

Methods inherited from class java.lang.Object

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

Method Details

instance

public static <T> Filter<T> instance()

Returns the singleton instance of this NullFilter.

Returns:

The singleton instance

accept

public boolean accept(Object value)

Description copied from interface: Filter

Determines whether the specified object is "accepted" by the filter. The semantics of "accept" is determined by the contract between the client and the server.

Specified by:

accept in interface Filter<Object>

Parameters:

value - The value to filter

Returns:

true if the given value is "accepted" by this filter; false if it was "rejected"

toString

public String toString()

Overrides:

toString in class Object