Package org.geotools.feature.visitor

Class MedianVisitor

Object

MedianVisitor

All Implemented Interfaces:

FeatureVisitor, FeatureAttributeVisitor, FeatureCalc

public class MedianVisitor
extends Object
implements FeatureCalc, FeatureAttributeVisitor

Calculates the median of an attribute in all features of a collection

Since:

2.2.M2

Author:

Cory Horner, Refractions

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MedianVisitor.MedianResult

Constructor Summary

Constructors

Constructor	Description
MedianVisitor(int attributeTypeIndex, SimpleFeatureType type)
MedianVisitor(String attributeTypeName)
MedianVisitor(String attrName, SimpleFeatureType type)
MedianVisitor(Expression expr)

Method Summary

Modifier and Type	Method	Description
Expression	getExpression()
List<Expression>	getExpressions()	List of expressions used by visitor.
Object	getMedian()	Return the median of all features in the collection
CalcResult	getResult()	Returns the result of the calculation as a handy object which can be merged and modified.
Optional<List<Class>>	getResultType(List<Class> inputTypes)	Returns the expected output type given the input type.
void	init(SimpleFeatureCollection collection)
void	reset()	Reset the stored information about the median.
void	setValue(Comparable median)
void	setValue(List<Comparable> list)
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

MedianVisitor

public MedianVisitor(String attributeTypeName)

MedianVisitor

public MedianVisitor(int attributeTypeIndex,
                     SimpleFeatureType type)
              throws IllegalFilterException

Throws:

IllegalFilterException

MedianVisitor

public MedianVisitor(String attrName,
                     SimpleFeatureType type)
              throws IllegalFilterException

Throws:

IllegalFilterException

MedianVisitor

public MedianVisitor(Expression expr)
              throws IllegalFilterException

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

getResultType

public Optional<List<Class>> getResultType(List<Class> inputTypes)

Description copied from interface: FeatureAttributeVisitor

Returns the expected output type given the input type.

Specified by:

getResultType in interface FeatureAttributeVisitor

Parameters:

inputTypes - The type of the input expressions

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()

getMedian

public Object getMedian()

Return the median of all features in the collection

reset

public void reset()

Reset the stored information about the median.

getResult

public CalcResult getResult()

Description copied from interface: FeatureCalc

Returns the result of the calculation as a handy object which can be merged and modified.

Specified by:

getResult in interface FeatureCalc

Returns:

the results of the calculation

setValue

public void setValue(List<Comparable> list)

setValue

public void setValue(Comparable median)