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ObjectReprojectingFilterVisitor.FunctionReprojector
protected class ReprojectingFilterVisitor.FunctionReprojector
Makes sure that the result of a function gets reprojected to the specified CRS, should it be a Geometry
Field Summary |
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Fields inherited from interface Expression |
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NIL |
Constructor Summary | |
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protected |
ReprojectingFilterVisitor.FunctionReprojector(CoordinateReferenceSystem propertyCrs,
Function delegate)
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Method Summary | ||
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Object |
accept(ExpressionVisitor visitor,
Object extraData)
Accepts a visitor. |
|
Object |
evaluate(Object object)
Evaluates the given expression based on the content of the given object. |
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evaluate(Object object,
Class<T> context)
Evaluates the given expressoin based on the content of the given object and the context type. |
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Literal |
getFallbackValue()
The value of the fallbackValue attribute is used as a default value, if the SE implementation does not support the function. |
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FunctionName |
getFunctionName()
Access to the FunctionName description as used in a FilterCapabilities document. |
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String |
getName()
Returns the name of the function to be called. |
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List<Expression> |
getParameters()
Returns the list subexpressions that will be evaluated to provide the parameters to the function. |
Methods inherited from class Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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protected ReprojectingFilterVisitor.FunctionReprojector(CoordinateReferenceSystem propertyCrs, Function delegate)
Method Detail |
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public String getName()
Function
cos
" or "atan2
".
You can use this name to look up the number of required parameters in a FilterCapabilities data structure. For the specific meaning of the required parameters you will need to consult the documentation.
getName
in interface Function
public List<Expression> getParameters()
Function
getParameters
in interface Function
public Object accept(ExpressionVisitor visitor, Object extraData)
Expression
return visitor.visit(this, extraData);
accept
in interface Expression
public Object evaluate(Object object)
Expression
evaluate
in interface Expression
public <T> T evaluate(Object object, Class<T> context)
Expression
The context
parameter is used to control the type of the
result of the expression. A particular expression may not be able to evaluate
to an instance of context
. Therefore to be safe calling code
should do a null check on the return value of this method, and call Expression.evaluate(Object)
if neccessary. Example:
Object input = ...; String result = expression.evaluate( input, String.class ); if ( result == null ) { result = expression.evalute( input ).toString(); } ...
Implementations that can not return a result as an instance of context
should return null
.
evaluate
in interface Expression
T
- The type of the returned object.object
- The object to evaluate the expression against.context
- The type of the resulting value of the expression.
context
.public Literal getFallbackValue()
Function
getFallbackValue
in interface Function
public FunctionName getFunctionName()
Function
getFunctionName
in interface Function
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