org.opengis.filter
Interface PropertyIsNull

All Superinterfaces:
Filter
All Known Subinterfaces:
NullFilter
All Known Implementing Classes:
IsNullImpl, NullFilterImpl

@XmlElement(value="PropertyIsNull")
public interface PropertyIsNull
extends Filter

Filter operator that checks if an expression's value is null. A null is equivalent to no value present. The value 0 is a valid value and is not considered null.

Since:
GeoAPI 2.0
Author:
Chris Dillard (SYS Technologies)

Field Summary
static String NAME
          Operator name used to check FilterCapabilities
 
Fields inherited from interface Filter
EXCLUDE, INCLUDE
 
Method Summary
 Expression getExpression()
          Returns the expression whose value will be checked for null.
 
Methods inherited from interface Filter
accept, evaluate
 

Field Detail

NAME

static final String NAME
Operator name used to check FilterCapabilities

See Also:
Constant Field Values
Method Detail

getExpression

@XmlElement(value="PropertyName")
Expression getExpression()
Returns the expression whose value will be checked for null.



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