Package org.geotools.feature.visitor

Class GroupByVisitor.GroupByResult

Object

GroupByResult

All Implemented Interfaces:

CalcResult

Enclosing class:

GroupByVisitor

public static class GroupByVisitor.GroupByResult
extends Object
implements CalcResult

This class implements the feature calculation result of the group by visitor.

Field Summary

Fields inherited from interface CalcResult

NULL_RESULT

Constructor Summary

Constructors

Constructor	Description
GroupByResult(Map<List<Object>,CalcResult> results, Aggregate aggregateVisitor, List<Expression> groupByAttributes)

Method Summary

Modifier and Type	Method	Description
Aggregate	getAggregateVisitor()
List<Expression>	getGroupByAttributes()
Map<List<Object>,CalcResult>	getResults()
Object	getValue()	Actual answer
boolean	isCompatible(CalcResult newResult)	Returns true if the target results is a compatible type with the current results, with compatible meaning that the two results may be merged.
CalcResult	merge(CalcResult newResult)	Returns the merged results of two CalcResult.
Object[]	toArray()	Access getValue as an array
double	toDouble()	Access getValue as a double
Envelope	toEnvelope()	Access getValue as an envelope
float	toFloat()	Access getValue as a float
Geometry	toGeometry()	Access getValue as a geometry
int	toInt()	Access getValue as an int
List	toList()	Access getValue as a list
long	toLong()	Access getValue as a long
Map	toMap()	The keys of the map will be List instead of arrays, since arrays don't give a decent hash code.
Point	toPoint()	Access getValue as a point
Set	toSet()	Access getValue as a set
String	toString()	Access getValue as a string

Methods inherited from class Object

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

Constructor Details

GroupByResult

public GroupByResult(Map<List<Object>,CalcResult> results,
 Aggregate aggregateVisitor,
 List<Expression> groupByAttributes)

Method Details

getResults

public Map<List<Object>,CalcResult> getResults()

getAggregateVisitor

public Aggregate getAggregateVisitor()

getGroupByAttributes

public List<Expression> getGroupByAttributes()

isCompatible

public boolean isCompatible(CalcResult newResult)

Description copied from interface: CalcResult

Returns true if the target results is a compatible type with the current results, with compatible meaning that the two results may be merged.

Specified by:

isCompatible in interface CalcResult

Parameters:

newResult - the second CalcResult Object

Returns:

true if the targetResults can be merged with the current results

merge

public CalcResult merge(CalcResult newResult)

Description copied from interface: CalcResult

Returns the merged results of two CalcResult. The way in which the results are merged is dependent on the type of the results added. A new instance is created containing the merged results.

For example: merging two min functions would return the smaller of the two values; merging a count and a sum would return an average.

Specified by:

merge in interface CalcResult

Returns:

the merged results

getValue

public Object getValue()

Description copied from interface: CalcResult

Actual answer

Specified by:

getValue in interface CalcResult

Returns:

the calculation result as a generic object

toInt

public int toInt()

Description copied from interface: CalcResult

Access getValue as an int

Specified by:

toInt in interface CalcResult

Returns:

the calculation result as a int (or 0 if not applicable)

toDouble

public double toDouble()

Description copied from interface: CalcResult

Access getValue as a double

Specified by:

toDouble in interface CalcResult

Returns:

the calculation result as a double (or 0 if not applicable)

toString

public String toString()

Description copied from interface: CalcResult

Access getValue as a string

Specified by:

toString in interface CalcResult

Overrides:

toString in class Object

Returns:

the calculation result as a string (or "" if not applicable)

toLong

public long toLong()

Description copied from interface: CalcResult

Access getValue as a long

Specified by:

toLong in interface CalcResult

Returns:

the calculation result as a long (or 0 if not applicable)

toFloat

public float toFloat()

Description copied from interface: CalcResult

Access getValue as a float

Specified by:

toFloat in interface CalcResult

Returns:

the calculation result as a float (or 0 if not applicable)

toGeometry

public Geometry toGeometry()

Description copied from interface: CalcResult

Access getValue as a geometry

Specified by:

toGeometry in interface CalcResult

Returns:

the calculation result as a geometry (or null if not applicable)

toEnvelope

public Envelope toEnvelope()

Description copied from interface: CalcResult

Access getValue as an envelope

Specified by:

toEnvelope in interface CalcResult

Returns:

the calculation result as an envelope (or null if not applicable)

toPoint

public Point toPoint()

Description copied from interface: CalcResult

Access getValue as a point

Specified by:

toPoint in interface CalcResult

Returns:

the calculation result as a point (or null if not applicable)

toSet

public Set toSet()

Description copied from interface: CalcResult

Access getValue as a set

Specified by:

toSet in interface CalcResult

Returns:

the calculation result as a set (or null if not applicable)

toList

public List toList()

Description copied from interface: CalcResult

Access getValue as a list

Specified by:

toList in interface CalcResult

Returns:

the calculation result as a list (or null if not applicable)

toArray

public Object[] toArray()

Description copied from interface: CalcResult

Access getValue as an array

Specified by:

toArray in interface CalcResult

Returns:

the calculation result as an array (or null if not applicable)

toMap

public Map toMap()

The keys of the map will be List instead of arrays, since arrays don't give a decent hash code.

Specified by:

toMap in interface CalcResult

Returns:

the calculation result as a map (or null if not applicable)