org.geotools.feature.visitor
Class UniqueVisitor

Object
  UniqueVisitor

All Implemented Interfaces:

FeatureAttributeVisitor, FeatureCalc, FeatureVisitor

public class UniqueVisitor
extends Object
implements FeatureCalc, FeatureAttributeVisitor

Generates a list of unique values from a collection

Since:

2.2.M2

Author:

Cory Horner, Refractions

Nested Class Summary

static class

UniqueVisitor.UniqueResult

Constructor Summary

UniqueVisitor(Expression expr)

UniqueVisitor(int attributeTypeIndex, SimpleFeatureType type)

UniqueVisitor(String attributeTypeName)

UniqueVisitor(String attrName, SimpleFeatureType type)

Method Summary

Expression	getExpression()
List<Expression>	getExpressions() List of expressions used by visitor.
CalcResult	getResult() Returns the result of the calculation as a handy object which can be merged and modified.
Set	getUnique()
void	init(SimpleFeatureCollection collection)
void	reset()
void	setValue(Object newSet)
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

UniqueVisitor

public UniqueVisitor(String attributeTypeName)

UniqueVisitor

public UniqueVisitor(int attributeTypeIndex,
                     SimpleFeatureType type)
              throws IllegalFilterException

Throws:

IllegalFilterException

UniqueVisitor

public UniqueVisitor(String attrName,
                     SimpleFeatureType type)
              throws IllegalFilterException

Throws:

IllegalFilterException

UniqueVisitor

public UniqueVisitor(Expression expr)

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()

getUnique

public Set getUnique()

setValue

public void setValue(Object newSet)

reset

public void reset()

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