org.geotools.filter.function
Class Collection_BoundsFunction

Object
  ExpressionAbstract
      DefaultExpression
          FunctionExpressionImpl
              Collection_BoundsFunction

All Implemented Interfaces:

Factory, ExpressionType, FunctionExpression, Expression, Function

public class Collection_BoundsFunction
extends FunctionExpressionImpl

Calculates the bounds of an attribute for a given FeatureCollection and Expression.

Since:

2.2M2

Author:

Cory Horner

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 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

Fields inherited from interface Expression

NIL

Constructor Summary

Collection_BoundsFunction()
Creates a new instance of Collection_BoundsFunction

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).
void	setExpression(Expression e)
void	setParameters(List args) The provided arguments are evaulated with respect to the FeatureCollection.

Methods inherited from class FunctionExpressionImpl

accept, equals, functionName, getArgCount, getArgs, getExpression, getFallbackValue, getFunctionName, getImplementationHints, getName, getParameters, getType, setArgs, setFallbackValue, setName, toString

Methods inherited from class DefaultExpression

accept, evaluate, getValue, isAttributeExpression, isExpression, isFunctionExpression, isGeometryExpression, isLiteralExpression, isMathExpression, isMathExpression

Methods inherited from class ExpressionAbstract

eval, eval, evaluate

Methods inherited from class Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface Expression

accept, evaluate, getValue

Methods inherited from interface Expression

evaluate

Field Detail

NAME

public static FunctionName NAME

Constructor Detail

Collection_BoundsFunction

public Collection_BoundsFunction()

Creates a new instance of Collection_BoundsFunction

Method Detail

setExpression

public void setExpression(Expression e)

setParameters

public void setParameters(List args)

The provided arguments are evaulated with respect to the FeatureCollection.

For an aggregate function (like unique) please use the WFS mandated XPath syntax to refer to featureMember content.

To refer to all 'X': featureMember/asterisk/X

Specified by:

setParameters in interface FunctionExpression

Overrides:

setParameters in class FunctionExpressionImpl

Parameters:

args - Function parameters

Throws:

IllegalArgumentException - If parameters do not match FunctionName

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