org.geotools.filter
Class IsNilImpl

Object
  extended by FilterAbstract
      extended by AbstractFilter
          extended by BinaryComparisonAbstract
              extended by CompareFilterImpl
                  extended by IsNilImpl
All Implemented Interfaces:
CompareFilter, FilterType, BinaryComparisonOperator, Filter, MultiValuedFilter, PropertyIsNil

public class IsNilImpl
extends CompareFilterImpl
implements PropertyIsNil

JD: PropertyIsNil requires us to return true if a property is "nil" in the xml schema sense. But we don't really have notion of schema in our filters. So for now we just make it an alias of PropertyIsNull. When someone (app-schema) has a need for this we can revisit.


Nested Class Summary
 
Nested classes/interfaces inherited from interface MultiValuedFilter
MultiValuedFilter.MatchAction
 
Field Summary
 
Fields inherited from class BinaryComparisonAbstract
expression1, expression2
 
Fields inherited from class AbstractFilter
filterType, permissiveConstruction
 
Fields inherited from class FilterAbstract
factory
 
Fields inherited from interface PropertyIsNil
NAME
 
Fields inherited from interface Filter
EXCLUDE, INCLUDE
 
Fields inherited from interface Filter
ALL, NONE
 
Fields inherited from interface FilterType
BETWEEN, COMPARE_EQUALS, COMPARE_GREATER_THAN, COMPARE_GREATER_THAN_EQUAL, COMPARE_LESS_THAN, COMPARE_LESS_THAN_EQUAL, COMPARE_NOT_EQUALS, FID, GEOMETRY_BBOX, GEOMETRY_BEYOND, GEOMETRY_CONTAINS, GEOMETRY_CROSSES, GEOMETRY_DISJOINT, GEOMETRY_DWITHIN, GEOMETRY_EQUALS, GEOMETRY_INTERSECTS, GEOMETRY_OVERLAPS, GEOMETRY_TOUCHES, GEOMETRY_WITHIN, LIKE, LOGIC_AND, LOGIC_NOT, LOGIC_OR, NULL
 
Constructor Summary
IsNilImpl(FilterFactory factory, Expression e1, Object nilReason)
           
 
Method Summary
 Object accept(FilterVisitor visitor, Object extraData)
          Used by FilterVisitors to perform some action on this filter instance.
 boolean evaluate(Object object)
          Give an object, this method determines if the test(s) represented by this filter object are passed.
 Expression getExpression()
          Returns the expression whose value will be checked for null.
 Object getNilReason()
          The nil reason.
 
Methods inherited from class CompareFilterImpl
addLeftValue, addRightValue, compare, equals, evaluate, getLeftValue, getRightValue, hashCode, setExpression1, setExpression2, toString
 
Methods inherited from class BinaryComparisonAbstract
and, comparable, eval, eval, getExpression1, getExpression2, getMatchAction, isMatchingCase, not, or
 
Methods inherited from class AbstractFilter
accept, contains, getFilterType, isCompareFilter, isGeometryDistanceFilter, isGeometryFilter, isLogicFilter, isMathFilter, isSimpleFilter
 
Methods inherited from class FilterAbstract
accepts, eval, eval, eval
 
Methods inherited from class Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface CompareFilter
contains
 
Methods inherited from interface Filter
accept, and, getFilterType, not, or
 
Methods inherited from interface BinaryComparisonOperator
getExpression1, getExpression2, isMatchingCase
 
Methods inherited from interface MultiValuedFilter
getMatchAction
 

Constructor Detail

IsNilImpl

public IsNilImpl(FilterFactory factory,
                 Expression e1,
                 Object nilReason)
Method Detail

evaluate

public boolean evaluate(Object object)
Description copied from interface: Filter
Give an object, this method determines if the test(s) represented by this filter object are passed.

This ability is used to allow Queries against both Features and and non spatial data (such as Record) and to express constraints on permissable data values.

Specified by:
evaluate in interface Filter
Returns:
true if the test(s) are passed for the provided object

getExpression

public Expression getExpression()
Description copied from interface: PropertyIsNil
Returns the expression whose value will be checked for null.

Specified by:
getExpression in interface PropertyIsNil

getNilReason

public Object getNilReason()
Description copied from interface: PropertyIsNil
The nil reason.

Specified by:
getNilReason in interface PropertyIsNil

accept

public Object accept(FilterVisitor visitor,
                     Object extraData)
Description copied from class: CompareFilterImpl
Used by FilterVisitors to perform some action on this filter instance. Typicaly used by Filter decoders, but may also be used by any thing which needs infomration from filter structure. Implementations should always call: visitor.visit(this); It is importatant that this is not left to a parent class unless the parents API is identical.

Specified by:
accept in interface Filter
Specified by:
accept in class CompareFilterImpl
Parameters:
visitor - The visitor which requires access to this filter, the method must call visitor.visit(this);


Copyright © 1996-2014 Geotools. All Rights Reserved.