com.ibm.websphere.objectgrid.continuousquery.filter
Class IsNullFilter

java.lang.Object
  com.ibm.websphere.objectgrid.continuousquery.filter.AbstractCQFilter<Object,Object,Object,Object>
      com.ibm.websphere.objectgrid.continuousquery.filter.IsNullFilter

All Implemented Interfaces:

ContinuousQueryFilter<Object,Object,Object,Object>, Serializable

public class IsNullFilter
extends AbstractCQFilter<Object,Object,Object,Object>

This filter checks if an attribute is null.

Since:

8.6

See Also:

Serialized Form

Field Summary

Fields inherited from class com.ibm.websphere.objectgrid.continuousquery.filter.AbstractCQFilter

version

Fields inherited from interface com.ibm.websphere.objectgrid.continuousquery.ContinuousQueryFilter

POJO_ADDRESSABLEKEYNAME, POJO_PATHSEPARATOR

Constructor Summary

IsNullFilter()
Constructor for serialization only.

IsNullFilter(String attributePath)
Construct a filter for checking a value from an arbitrary object is null.

Method Summary

String	createString() Creates a string representation of the continuous query filter, this method is used by AbstractCQFilter.toString().
boolean	filter(FilterContent content) Checks if the supplied object passes the filter.

Methods inherited from class com.ibm.websphere.objectgrid.continuousquery.filter.AbstractCQFilter

equals, getAttribute, hashCode, isKeyFilter, toString, validateAttributePath

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

IsNullFilter

public IsNullFilter()

Constructor for serialization only.

IsNullFilter

public IsNullFilter(String attributePath)

Construct a filter for checking a value from an arbitrary object is null.

Parameters:

attributePath -

See Also:

CompareFilter.CompareFilter(String, Object)

Method Detail

filter

public boolean filter(FilterContent content)
               throws ContinuousQueryException

Description copied from interface: ContinuousQueryFilter

Checks if the supplied object passes the filter.

Parameters:

content - A representation of the cache entry to be checked

Returns:

true if the object matches the filtering criteria, false otherwise

Throws:

ContinuousQueryException

See Also:

ContinuousQueryFilter.filter(FilterContent)

createString

public String createString()

Description copied from class: AbstractCQFilter

Creates a string representation of the continuous query filter, this method is used by AbstractCQFilter.toString().

The string will be used for identifying and comparing filters, i.e. it will be used in AbstractCQFilter.hashCode() and AbstractCQFilter.equals(Object), so the returned value must be in unique format among all filters in the system.

Specified by:

createString in class AbstractCQFilter<Object,Object,Object,Object>

Returns:

" ISNOTNULL", where refers to the path for accessing a value from the object to be filtered

See Also:

AbstractCQFilter.createString()