org.geotools.filter
Class IsNullImpl

java.lang.Object
  extended by org.geotools.filter.FilterAbstract
      extended by org.geotools.filter.AbstractFilter
          extended by org.geotools.filter.BinaryComparisonAbstract
              extended by org.geotools.filter.CompareFilterImpl
                  extended by org.geotools.filter.IsNullImpl
All Implemented Interfaces:
CompareFilter, FilterType, NullFilter, org.opengis.filter.BinaryComparisonOperator, org.opengis.filter.Filter, org.opengis.filter.PropertyIsNull

public class IsNullImpl
extends CompareFilterImpl
implements NullFilter


Field Summary
 
Fields inherited from class org.geotools.filter.BinaryComparisonAbstract
expression1, expression2
 
Fields inherited from class org.geotools.filter.AbstractFilter
filterType, permissiveConstruction
 
Fields inherited from class org.geotools.filter.FilterAbstract
factory
 
Fields inherited from interface org.geotools.filter.Filter
ALL, NONE
 
Fields inherited from interface org.geotools.filter.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
 
Fields inherited from interface org.opengis.filter.PropertyIsNull
NAME
 
Fields inherited from interface org.opengis.filter.Filter
EXCLUDE, INCLUDE
 
Constructor Summary
IsNullImpl(org.opengis.filter.FilterFactory factory, org.opengis.filter.expression.Expression expression)
           
 
Method Summary
 java.lang.Object accept(org.opengis.filter.FilterVisitor visitor, java.lang.Object extraData)
          Used by FilterVisitors to perform some action on this filter instance.
 boolean evaluate(java.lang.Object feature)
           
 org.opengis.filter.expression.Expression getExpression()
           
 Expression getNullCheckValue()
          Returns the expression being checked for null.
 void nullCheckValue(Expression nullCheck)
          Determines whether or not a given feature is 'inside' this filter.
 void setExpression(org.opengis.filter.expression.Expression expression)
           
 
Methods inherited from class org.geotools.filter.CompareFilterImpl
addLeftValue, addRightValue, compare, equals, evaluate, getLeftValue, getRightValue, hashCode, setExpression1, setExpression2, toString
 
Methods inherited from class org.geotools.filter.BinaryComparisonAbstract
and, comparable, eval, getExpression1, getExpression2, isMatchingCase, not, or
 
Methods inherited from class org.geotools.filter.AbstractFilter
accept, contains, getFilterType, isCompareFilter, isGeometryDistanceFilter, isGeometryFilter, isLogicFilter, isMathFilter, isSimpleFilter
 
Methods inherited from class org.geotools.filter.FilterAbstract
accepts, eval, eval, eval
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface org.geotools.filter.NullFilter
contains
 
Methods inherited from interface org.geotools.filter.Filter
accept, and, evaluate, getFilterType, not, or
 
Methods inherited from interface org.geotools.filter.CompareFilter
contains
 
Methods inherited from interface org.opengis.filter.BinaryComparisonOperator
getExpression1, getExpression2, isMatchingCase
 

Constructor Detail

IsNullImpl

public IsNullImpl(org.opengis.filter.FilterFactory factory,
                  org.opengis.filter.expression.Expression expression)
Method Detail

evaluate

public boolean evaluate(java.lang.Object feature)
Specified by:
evaluate in interface org.opengis.filter.Filter

accept

public java.lang.Object accept(org.opengis.filter.FilterVisitor visitor,
                               java.lang.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 org.opengis.filter.Filter
Specified by:
accept in class CompareFilterImpl
Parameters:
visitor - The visitor which requires access to this filter, the method must call visitor.visit(this);

nullCheckValue

public void nullCheckValue(Expression nullCheck)
                    throws IllegalFilterException
Description copied from interface: NullFilter
Determines whether or not a given feature is 'inside' this filter.

Specified by:
nullCheckValue in interface NullFilter
Parameters:
nullCheck - The attribute expression to null check.
Throws:
IllegalFilterException - If attempting to add a non-attribute expression.

getNullCheckValue

public Expression getNullCheckValue()
Description copied from interface: NullFilter
Returns the expression being checked for null.

Specified by:
getNullCheckValue in interface NullFilter
Returns:
the Expression to null check.

getExpression

public org.opengis.filter.expression.Expression getExpression()
Specified by:
getExpression in interface org.opengis.filter.PropertyIsNull

setExpression

public void setExpression(org.opengis.filter.expression.Expression expression)


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