Package org.geotools.filter.visitor
Class NullFilterVisitor
- Object
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- NullFilterVisitor
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- All Implemented Interfaces:
ExpressionVisitor
,FilterVisitor
- Direct Known Subclasses:
ExtractBoundsFilterVisitor
,TimeRangeVisitor
public abstract class NullFilterVisitor extends Object implements FilterVisitor, ExpressionVisitor
Abstract implementation of FilterVisitor simple returns the provided data.This class can be used as is as a placeholder that does nothing:
The class can also be used as an alternative to DefaultFilterVisitor if you want to only walk part of the data structure:Integer one = (Integer) filter.accepts( NullFilterVisitor.NULL_VISITOR, 1 );
The base class provides implementations for:FilterVisitor allFids = new NullFilterVisitor(){ public Object visit( Id filter, Object data ) { if( data == null) return null; Set set = (Set) data; set.addAll(filter.getIDs()); return set; } }; Set set = (Set) myFilter.accept(allFids, new HashSet()); Set set2 = (Set) myFilter.accept(allFids, null ); // set2 will be null
- walking And, Or, and Not data structures, returning null at any point will exit early
- a default implementation for every other construct that will return the provided data
- Author:
- Jody Garnett (Refractions Research)
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Field Summary
Fields Modifier and Type Field Description static NullFilterVisitor
NULL_VISITOR
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Constructor Summary
Constructors Constructor Description NullFilterVisitor()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Object
visit(And filter, Object data)
Object
visit(ExcludeFilter filter, Object data)
VisitFilter.EXCLUDE
(often used during data structure transformations).Object
visit(Add expression, Object data)
Object
visit(Divide expression, Object data)
Object
visit(Function expression, Object data)
Object
visit(Literal expression, Object data)
Object
visit(Multiply expression, Object data)
Object
visit(NilExpression expression, Object data)
Used to visit a Expression.NIL, also called fornull
where an expression is expected.Object
visit(PropertyName expression, Object data)
Object
visit(Subtract expression, Object data)
Object
visit(Id filter, Object data)
Object
visit(IncludeFilter filter, Object data)
VisitFilter.INCLUDE
(often used during data structure transformations).Object
visit(NativeFilter nativeFilter, Object data)
Object
visit(Not filter, Object data)
Object
visit(Or filter, Object data)
Object
visit(PropertyIsBetween filter, Object data)
Object
visit(PropertyIsEqualTo filter, Object data)
Object
visit(PropertyIsGreaterThanOrEqualTo filter, Object data)
Object
visit(PropertyIsGreaterThan filter, Object data)
Object
visit(PropertyIsLessThanOrEqualTo filter, Object data)
Object
visit(PropertyIsLessThan filter, Object data)
Object
visit(PropertyIsLike filter, Object data)
Object
visit(PropertyIsNil filter, Object data)
Object
visit(PropertyIsNotEqualTo filter, Object data)
Object
visit(PropertyIsNull filter, Object data)
Object
visit(BBOX filter, Object data)
Object
visit(Beyond filter, Object data)
Object
visit(Contains filter, Object data)
Object
visit(Crosses filter, Object data)
Object
visit(Disjoint filter, Object data)
Object
visit(DWithin filter, Object data)
Object
visit(Equals filter, Object data)
Object
visit(Intersects filter, Object data)
Object
visit(Overlaps filter, Object data)
Object
visit(Touches filter, Object data)
Object
visit(Within filter, Object data)
Object
visit(After after, Object data)
Object
visit(AnyInteracts anyInteracts, Object data)
Object
visit(Before before, Object data)
Object
visit(Begins begins, Object data)
Object
visit(BegunBy begunBy, Object data)
Object
visit(During during, Object data)
Object
visit(EndedBy endedBy, Object data)
Object
visit(Ends ends, Object data)
Object
visit(Meets meets, Object data)
Object
visit(MetBy metBy, Object data)
Object
visit(OverlappedBy overlappedBy, Object data)
Object
visit(TContains contains, Object data)
Object
visit(TEquals equals, Object data)
Object
visit(TOverlaps contains, Object data)
Object
visitNullFilter(Object data)
Used to account for anull
filter value.
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Field Detail
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NULL_VISITOR
public static NullFilterVisitor NULL_VISITOR
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Method Detail
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visit
public Object visit(ExcludeFilter filter, Object data)
Description copied from interface:FilterVisitor
VisitFilter.EXCLUDE
(often used during data structure transformations).- Specified by:
visit
in interfaceFilterVisitor
- Parameters:
filter
-Filter.EXCLUDE
.data
- Value object provided to visitor- Returns:
- subclass supplied
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visit
public Object visit(IncludeFilter filter, Object data)
Description copied from interface:FilterVisitor
VisitFilter.INCLUDE
(often used during data structure transformations).- Specified by:
visit
in interfaceFilterVisitor
- Parameters:
filter
-Filter.INCLUDE
.data
- Value object provided to visitor- Returns:
- subclass supplied
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visit
public Object visit(And filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Id filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Not filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Or filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(PropertyIsBetween filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(PropertyIsEqualTo filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(PropertyIsNotEqualTo filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(PropertyIsGreaterThan filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(PropertyIsGreaterThanOrEqualTo filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(PropertyIsLessThan filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(PropertyIsLessThanOrEqualTo filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(PropertyIsLike filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(PropertyIsNull filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(PropertyIsNil filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(BBOX filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Beyond filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Contains filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Crosses filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Disjoint filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(DWithin filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Equals filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Intersects filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Overlaps filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Touches filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Within filter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visitNullFilter
public Object visitNullFilter(Object data)
Description copied from interface:FilterVisitor
Used to account for anull
filter value.This is particularly used during data structure transofrmations, however the use of
null
is not recommended. Please make use of Filter.NONE and Filter.ALL as placeholder objects that communicate intent.- Specified by:
visitNullFilter
in interfaceFilterVisitor
- Parameters:
data
- Value object provided to visitor- Returns:
- subclass defined
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visit
public Object visit(NilExpression expression, Object data)
Description copied from interface:ExpressionVisitor
Used to visit a Expression.NIL, also called fornull
where an expression is expected.This is particularly useful when doing data transformations, as an example when using a StyleSymbolizer Expression.NIL can be used to represent the default stroke color.
- Specified by:
visit
in interfaceExpressionVisitor
- Returns:
- implementation specific
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visit
public Object visit(Add expression, Object data)
- Specified by:
visit
in interfaceExpressionVisitor
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visit
public Object visit(Divide expression, Object data)
- Specified by:
visit
in interfaceExpressionVisitor
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visit
public Object visit(Function expression, Object data)
- Specified by:
visit
in interfaceExpressionVisitor
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visit
public Object visit(Literal expression, Object data)
- Specified by:
visit
in interfaceExpressionVisitor
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visit
public Object visit(Multiply expression, Object data)
- Specified by:
visit
in interfaceExpressionVisitor
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visit
public Object visit(PropertyName expression, Object data)
- Specified by:
visit
in interfaceExpressionVisitor
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visit
public Object visit(Subtract expression, Object data)
- Specified by:
visit
in interfaceExpressionVisitor
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visit
public Object visit(After after, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(AnyInteracts anyInteracts, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Before before, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Begins begins, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(BegunBy begunBy, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(During during, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(EndedBy endedBy, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Ends ends, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(Meets meets, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(MetBy metBy, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(OverlappedBy overlappedBy, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(TContains contains, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(TEquals equals, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(TOverlaps contains, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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visit
public Object visit(NativeFilter nativeFilter, Object data)
- Specified by:
visit
in interfaceFilterVisitor
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