org.geotools.feature.visitor

Class AverageVisitor

Object

AverageVisitor

All Implemented Interfaces:

FeatureAttributeVisitor, FeatureCalc, FeatureVisitor

public class AverageVisitor
extends Object
implements FeatureCalc, FeatureAttributeVisitor

Calculates the Average

Since:

2.2.M2

Author:

Cory Horner, Refractions

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AverageVisitor.AverageResult

Constructor Summary

Constructors

Constructor and Description
AverageVisitor(Expression expr) Constructor class for the AverageVisitor using an expression
AverageVisitor(int attributeTypeIndex, SimpleFeatureType type) Constructor class for the AverageVisitor using AttributeDescriptor ID
AverageVisitor(String attrName, SimpleFeatureType type) Constructor class for the AverageVisitor using AttributeDescriptor Name

Method Summary

Modifier and Type	Method and Description
Object	getAverage() Returns the average from the visitor's current
Expression	getExpression()
List<Expression>	getExpressions() List of expressions used by visitor.
CalcResult	getResult() Returns a CalcResult object (containing the Average)
void	init(SimpleFeatureCollection collection)
void	reset() Resets the "Average" strategy pattern
void	setValue(int newCount, Object newSum)
void	setValue(Object newAverage)
void	visit(Feature feature) Visit the provided feature.
void	visit(SimpleFeature feature)

Methods inherited from class Object

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

Constructor Detail

AverageVisitor

public AverageVisitor(int attributeTypeIndex,
                      SimpleFeatureType type)
               throws IllegalFilterException

Constructor class for the AverageVisitor using AttributeDescriptor ID

Parameters:

attributeTypeIndex - integer representing the AttributeDescriptor

type - FeatureType

Throws:

IllegalFilterException

AverageVisitor

public AverageVisitor(String attrName,
                      SimpleFeatureType type)
               throws IllegalFilterException

Constructor class for the AverageVisitor using AttributeDescriptor Name

Parameters:

attrName - string respresenting the AttributeDescriptor

type - FeatureType

Throws:

IllegalFilterException

AverageVisitor

public AverageVisitor(Expression expr)
               throws IllegalFilterException

Constructor class for the AverageVisitor using an expression

Parameters:

expr -

Throws:

IllegalFilterException

Method Detail

init

public void init(SimpleFeatureCollection collection)

getExpressions

public List<Expression> getExpressions()

Description copied from interface: FeatureAttributeVisitor

List of expressions used by visitor.

Specified by:

getExpressions in interface FeatureAttributeVisitor

visit

public void visit(SimpleFeature feature)

visit

public void visit(Feature feature)

Description copied from interface: FeatureVisitor

Visit the provided feature.

Please consult the documentation for the FeatureCollection you are visiting to learn more - the provided feature may be invalid, or read only.

Specified by:

visit in interface FeatureVisitor

getExpression

public Expression getExpression()

getAverage

public Object getAverage()

Returns the average from the visitor's current

Returns:

the average

reset

public void reset()

Resets the "Average" strategy pattern

getResult

public CalcResult getResult()

Returns a CalcResult object (containing the Average)

Specified by:

getResult in interface FeatureCalc

Returns:

the results of the calculation

setValue

public void setValue(Object newAverage)

setValue

public void setValue(int newCount,
                     Object newSum)