org.geotools.filter.function
Class FilterFunction_property

Object
  extended by ExpressionAbstract
      extended by DefaultExpression
          extended by FunctionExpressionImpl
              extended by FilterFunction_property
All Implemented Interfaces:
Factory, ExpressionType, FunctionExpression, Expression, Function, VolatileFunction

public class FilterFunction_property
extends FunctionExpressionImpl
implements VolatileFunction

Extracts a property from a feature, taking the property name as a parameter

Author:
Andrea Aime - GeoSolutions

Field Summary
static FunctionName NAME
           
 
Fields inherited from class FunctionExpressionImpl
fallback, functionName, name, params
 
Fields inherited from class DefaultExpression
expressionType, permissiveConstruction
 
Fields inherited from interface Expression
NIL
 
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
 
Constructor Summary
FilterFunction_property()
           
 
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).
 Object evaluate(Object object, Class context)
          Default implementation delegates handling of context conversion to Value utility class.
 
Methods inherited from class FunctionExpressionImpl
accept, equals, functionName, getArgCount, getArgs, getExpression, getFallbackValue, getFunctionName, getImplementationHints, getName, getParameters, getType, setArgs, setFallbackValue, setName, setParameters, toString
 
Methods inherited from class DefaultExpression
accept, evaluate, getValue, isAttributeExpression, isExpression, isFunctionExpression, isGeometryExpression, isLiteralExpression, isMathExpression, isMathExpression
 
Methods inherited from class ExpressionAbstract
eval, eval
 
Methods inherited from class Object
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface Function
getFallbackValue, getFunctionName, getName, getParameters
 
Methods inherited from interface Expression
accept
 
Methods inherited from interface Expression
accept, evaluate, getValue
 

Field Detail

NAME

public static FunctionName NAME
Constructor Detail

FilterFunction_property

public FilterFunction_property()
Method Detail

evaluate

public Object evaluate(Object object,
                       Class context)
Description copied from class: ExpressionAbstract
Default implementation delegates handling of context conversion to Value utility class.

Subclasses are expected to make use of the Value utility class (as the easiest way to provide value morphing in confirmance with the Filter specification).

Specified by:
evaluate in interface Expression
Overrides:
evaluate in class ExpressionAbstract
Parameters:
object - The object to evaluate the expression against.
context - The type of the resulting value of the expression.
Returns:
Evaluates the given expression based on the content of the given object an an instance of context.

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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