org.deegree.model.filterencoding
Class PropertyIsNullOperation

java.lang.Object
  org.deegree.model.filterencoding.AbstractOperation
      org.deegree.model.filterencoding.ComparisonOperation
          org.deegree.model.filterencoding.PropertyIsNullOperation

All Implemented Interfaces:

Operation

public class PropertyIsNullOperation
extends ComparisonOperation

Encapsulates the information of a -element (as defined in Filter DTD). The DTD defines the properties type to be tested as PropertyName or Literal.

Version:

07.08.2002

Author:

Markus Schneider

Field Summary

Fields inherited from class org.deegree.model.filterencoding.AbstractOperation

operatorId

Constructor Summary

PropertyIsNullOperation(PropertyName propertyName)

Method Summary

static Operation	buildFromDOM(Element element) Deprecated. use the 1.0.0 filter encoding aware method instead.
static Operation	buildFromDOM(Element element, boolean useVersion_1_0_0) Given a DOM-fragment, a corresponding Operation-object is built.
boolean	evaluate(Feature feature) Calculates the PropertyIsNull -Operation's logical value based on the certain property values of the given Feature.
PropertyName	getPropertyName()
StringBuffer	toXML() Produces an indented XML representation of this object.

Methods inherited from class org.deegree.model.filterencoding.AbstractOperation

getOperatorId, getOperatorName

Methods inherited from class java.lang.Object

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

Constructor Detail

PropertyIsNullOperation

public PropertyIsNullOperation(PropertyName propertyName)

Parameters:

propertyName - to check for

Method Detail

getPropertyName

public PropertyName getPropertyName()

Returns:

the property name

buildFromDOM

@Deprecated
public static Operation buildFromDOM(Element element)
                              throws FilterConstructionException

Deprecated. use the 1.0.0 filter encoding aware method instead.

Given a DOM-fragment, a corresponding Operation-object is built. This method recursively calls other buildFromDOM () - methods to validate the structure of the DOM-fragment.

Parameters:

element - to build the bean from

useVersion_1_0_0 - if the filterencoding 1.0.0 should be used.

Returns:

a Bean of the DOM

Throws:

FilterConstructionException - if the structure of the DOM-fragment is invalid

buildFromDOM

public static Operation buildFromDOM(Element element,
                                     boolean useVersion_1_0_0)
                              throws FilterConstructionException

Given a DOM-fragment, a corresponding Operation-object is built. This method recursively calls other buildFromDOM () - methods to validate the structure of the DOM-fragment.

Parameters:

element - to build the bean from

useVersion_1_0_0 - if the filterencoding 1.0.0 should be used.

Returns:

a Bean of the DOM

Throws:

FilterConstructionException - if the structure of the DOM-fragment is invalid

toXML

public StringBuffer toXML()

Produces an indented XML representation of this object.

evaluate

public boolean evaluate(Feature feature)
                 throws FilterEvaluationException

Calculates the PropertyIsNull -Operation's logical value based on the certain property values of the given Feature.

Parameters:

feature - that determines the property values

Returns:

true, if the PropertyIsNull -Operation evaluates to true, else false

Throws:

FilterEvaluationException - if the evaluation fails