Package org.geotools.feature.visitor

Class NearestVisitor

Object

NearestVisitor

Type Parameters:

T -

All Implemented Interfaces:

FeatureVisitor, FeatureAttributeVisitor, FeatureCalc

public class NearestVisitor
extends Object
implements FeatureCalc, FeatureAttributeVisitor

Finds the nearest value to the provided one in the attribute domain.

Author:

Andrea Aime - GeoSolutions, Ilkka Rinne / Spatineo Inc for the Finnish Meteorological Institute

Constructor Summary

Constructors

Constructor	Description
NearestVisitor(Expression expression, Object valueToMatch)	Creates a NearestVisitor instance for the given attribute and a value to match.

Method Summary

Modifier and Type	Method	Description
Expression	getExpression()	Expression used to access collection content.
List<Expression>	getExpressions()	List of expressions used by visitor.
Object	getNearestMatch()	Returns the match after visit(org.geotools.api.feature.Feature).
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.
Object	getValueToMatch()	Provided value to match against.
void	reset()
void	setValue(Comparable nearest)
void	setValue(Comparable maxBelow, Comparable minAbove)
void	visit(Feature feature)	Visitor function, which looks at each feature and finds the value of the attribute given attribute nearest to the given comparison value.

Methods inherited from class Object

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

Constructor Detail

NearestVisitor

public NearestVisitor(Expression expression,
                      Object valueToMatch)

Creates a NearestVisitor instance for the given attribute and a value to match.

Parameters:

valueToMatch - The target value to match

Method Detail

visit

public void visit(Feature feature)

Visitor function, which looks at each feature and finds the value of the attribute given attribute nearest to the given comparison value.

Specified by:

visit in interface FeatureVisitor

Parameters:

feature - the feature to be visited

reset

public void reset()

setValue

public void setValue(Comparable nearest)

setValue

public void setValue(Comparable maxBelow,
                     Comparable minAbove)

getNearestMatch

public Object getNearestMatch()
                       throws IllegalStateException

Returns the match after visit(org.geotools.api.feature.Feature).

Throws:

IllegalStateException

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

getExpression

public Expression getExpression()

Expression used to access collection content.

Returns:

expr used to access collection

getValueToMatch

public Object getValueToMatch()

Provided value to match against.

Returns:

value to match against.

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