PropertyIsNull (Geotools modules 34-SNAPSHOT API)

All Superinterfaces:

Filter

All Known Implementing Classes:

IsNullImpl, NullFilterImpl
```
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
  
  Fields
  Modifier and Type Field Description
  
  static String NAME
  Operator name used to check FilterCapabilities
  - Fields inherited from interface Filter
    EXCLUDE, INCLUDE
- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  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
```
Expression getExpression()
```
    Returns the expression whose value will be checked for null.