org.geotools.filter
Class RecodeFunction
Object
RecodeFunction
- All Implemented Interfaces:
- Expression, Function
public class RecodeFunction
- extends Object
- implements Function
This is an implemenation of the Recode function as defined by
the OGC Symbology Encoding (SE) 1.1 specification.
The Recode function provides a lookup table facility (think HashTable)
where both keys and values can be any Expression
. The first
parameter to the function specifies the source of the value to lookup,
e.g. the name of a feature property as a Literal
. The remaining
parameters define the lookup table as key:value pairs. Thus there should
be an odd number of parameters in total: the lookup value parameter plus
the set of key value pairs.
Where the lookup involves String
values, comparisons are done
case-insensitively.
If the lookup value does not match any of the keys defined this function
returns null
.
- Author:
- Johann Sorel (Geomatys), Michael Bedward
- Module:
modules/library/render (gt-render.jar)
Field Summary |
static FunctionName |
NAME
Make the instance of FunctionName available in a consistent spot. |
Fields inherited from interface Expression |
NIL |
Methods inherited from class Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
NAME
public static final FunctionName NAME
- Make the instance of FunctionName available in a consistent spot.
RecodeFunction
public RecodeFunction()
RecodeFunction
public RecodeFunction(List<Expression> parameters,
Literal fallback)
getName
public String getName()
- Specified by:
getName
in interface Function
getParameters
public List<Expression> getParameters()
- Specified by:
getParameters
in interface Function
accept
public Object accept(ExpressionVisitor visitor,
Object extraData)
- Specified by:
accept
in interface Expression
evaluate
public Object evaluate(Object object)
- Specified by:
evaluate
in interface Expression
evaluate
public <T> T evaluate(Object object,
Class<T> context)
- Specified by:
evaluate
in interface Expression
getFallbackValue
public Literal getFallbackValue()
- Specified by:
getFallbackValue
in interface Function
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