org.geotools.filter.function
Class Collection_CountFunction
Object
ExpressionAbstract
DefaultExpression
FunctionExpressionImpl
Collection_CountFunction
- All Implemented Interfaces:
- Factory, ExpressionType, FunctionExpression, Expression, Function
public class Collection_CountFunction
- extends FunctionExpressionImpl
Calculates the count value of an attribute for a given SimpleFeatureCollection and
Expression.
- Since:
- 2.2M2
- Author:
- Cory Horner
Fields inherited from interface ExpressionType |
ATTRIBUTE, ATTRIBUTE_DOUBLE, ATTRIBUTE_GEOMETRY, ATTRIBUTE_INTEGER, ATTRIBUTE_STRING, ATTRIBUTE_UNDECLARED, FUNCTION, LITERAL_DOUBLE, LITERAL_GEOMETRY, LITERAL_INTEGER, LITERAL_LONG, LITERAL_STRING, LITERAL_UNDECLARED, MATH_ADD, MATH_DIVIDE, MATH_MULTIPLY, MATH_SUBTRACT |
Method Summary |
Object |
evaluate(Object feature)
This method checks if the object is an instance of Feature and
if so, calls through to #evaluate(Feature) . |
Methods inherited from class FunctionExpressionImpl |
accept, equals, functionName, getArgCount, getArgs, getExpression, getFallbackValue, getFunctionName, getImplementationHints, getName, getParameters, getType, setArgs, setFallbackValue, setName, setParameters, toString |
NAME
public static FunctionName NAME
Collection_CountFunction
public Collection_CountFunction()
- Creates a new instance of Collection_CountFunction
evaluate
public Object evaluate(Object feature)
- Description copied from class:
DefaultExpression
- This method checks if the object is an instance of
Feature
and
if so, calls through to #evaluate(Feature)
. This is done
to maintain backwards compatability with previous version of Expression api
which depended on Feature. If the object is not an instance of feature
the super implementation is called.
- Specified by:
evaluate
in interface Expression
- Overrides:
evaluate
in class DefaultExpression
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