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org.eclipse.persistence.jpa.internal.jpql.util
Class NullFilter

java.lang.Object
org.eclipse.persistence.jpa.internal.jpql.util.NullFilter

All Implemented Interfaces:

Filter<java.lang.Object>

public final class NullFilter

extends java.lang.Object

implements Filter<java.lang.Object>

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

Since:

2.3

Version:

2.3

Author:

Pascal Filion

Field Summary

private static NullFilter

INSTANCE The singleton instance of this NullFilter.

Constructor Summary

private

NullFilter() Creates a new NullFilter.

Method Summary

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

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

private static final NullFilter INSTANCE

The singleton instance of this NullFilter.

Constructor Detail

NullFilter

private NullFilter()

Creates a new NullFilter.

Method Detail

instance

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

Returns the singleton instance of this NullFilter.

Returns:

The singleton instance

accept

public boolean accept(java.lang.Object value)

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<java.lang.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 java.lang.String toString()

Overrides:

toString in class java.lang.Object

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