net.sf.ehcache.search.expression
Class IsNull

java.lang.Object
  net.sf.ehcache.search.expression.BaseCriteria
      net.sf.ehcache.search.expression.IsNull

All Implemented Interfaces:

Criteria

public class IsNull
extends BaseCriteria

Tests whether the value of attribute with given name is null

Author:

vfunshte

Constructor Summary

IsNull(String attributeName)

Method Summary

boolean	execute(Element e, Map<String,AttributeExtractor> attributeExtractors) Test this criteria against a cache element
String	getAttributeName() Get attribute name.
Set<Attribute<?>>	getAttributes() Returns all search attributes referenced by this instance

Methods inherited from class net.sf.ehcache.search.expression.BaseCriteria

and, getExtractor, not, or

Methods inherited from class java.lang.Object

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

Constructor Detail

IsNull

public IsNull(String attributeName)

Parameters:

attributeName -

Method Detail

getAttributeName

public String getAttributeName()

Get attribute name.

Returns:

attribute name.

execute

public boolean execute(Element e,
                       Map<String,AttributeExtractor> attributeExtractors)

Description copied from interface: Criteria

Test this criteria against a cache element

Parameters:

e - cache element

attributeExtractors - map of attribute extractors to attribute value names

Returns:

true if the criteria matches this element

getAttributes

public Set<Attribute<?>> getAttributes()

Description copied from class: BaseCriteria

Returns all search attributes referenced by this instance

Specified by:

getAttributes in class BaseCriteria