com.supermap.services.ogc.filter

Class PropertyIsNull

java.lang.Object

com.supermap.services.ogc.filter.Filter

com.supermap.services.ogc.filter.PropertyIsNull

All Implemented Interfaces:

java.io.Serializable

public class PropertyIsNull
extends Filter

The abstract class of <PropertyIsNull> elements.

Sets the condition that certain property of result elements is empty, i.e., without any content. Note that 0 is a legal value and not a null value.

A PropertyIsNull element consists of the name of the property field (a<PropertyName> child element).

See Also:

Serialized Form

Field Summary

Fields inherited from class com.supermap.services.ogc.filter.Filter

name, subExpression

Constructor Summary

Constructors

Constructor and Description
PropertyIsNull() The constructor.
PropertyIsNull(Literal literal) Constructs a PropertyIsNull object by using a value (a element).
PropertyIsNull(PropertyName propertyName) Constructs a PropertyIsNull object by using the name of the property field.

Method Summary

Methods

Modifier and Type	Method and Description
void	accept(AbstractFilterVisitor visitor)
FilterType	getFilterType() Gets the Filter element type.
Literal	getLiteral() Gets the value, i.e., the Literal element.
PropertyName	getPropertyName() Gets the name of the property field.

Methods inherited from class com.supermap.services.ogc.filter.Filter

copy, getName, getSubExpression, getSubExpressionCount, setSubExpression

Methods inherited from class java.lang.Object

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

Constructor Detail

PropertyIsNull

public PropertyIsNull(Literal literal)
               throws OGCException

Constructs a PropertyIsNull object by using a value (a element).

Parameters:

literal - The value (a element).

Throws:

OGCException - An OGC service exception.

PropertyIsNull

public PropertyIsNull(PropertyName propertyName)
               throws OGCException

Constructs a PropertyIsNull object by using the name of the property field.

Represents the condition that this property field is null.

Parameters:

propertyName - The name of the property field (a <PropertyName> element).

Throws:

OGCException - An OGC service exception.

PropertyIsNull

public PropertyIsNull()

The constructor.

Method Detail

accept

public void accept(AbstractFilterVisitor visitor)
            throws OGCException

Specified by:

accept in class Filter

Throws:

OGCException

getFilterType

public FilterType getFilterType()

Description copied from class: Filter

Gets the Filter element type.

Specified by:

getFilterType in class Filter

Returns:

The Filter element type.

getLiteral

public Literal getLiteral()

Gets the value, i.e., the Literal element.

This method may return null.

Returns:

the Literal element representing the value.

getPropertyName

public PropertyName getPropertyName()

Gets the name of the property field.

This method may return null.

Returns:

A PropertyName element that represents the name of the property field.