com.almworks.jira.structure.api.attribute.loader.basic

Class NumberSumLoader

Object

AbstractAttributeLoader<T>

AbstractAggregateLoader<T>

ReducingAggregateLoader<T>

SingleDependencyReducingAggregateLoader<Number>

NumberSumLoader

All Implemented Interfaces:

AggregateAttributeLoader<Number>, AttributeLoader<Number>, MultiRowAttributeLoader<Number>, ValueReducer<Number>, RowAttributeLoader<Number>

public class NumberSumLoader
extends SingleDependencyReducingAggregateLoader<Number>

Field Summary

Fields inherited from class SingleDependencyReducingAggregateLoader

myDependency

Fields inherited from class AbstractAttributeLoader

mySpec

Constructor Summary

Constructors

Constructor and Description
NumberSumLoader(AttributeSpec<Number> spec, AttributeSpec<Number> dependency)

Method Summary

Modifier and Type	Method and Description
Number	merge(Supplier<Number> self, List<Number> list) Calculates reduction of tree node where self is value of the current row and list represents values passed from children (it may be or be not values of children rows depending on strategy type).
Number	merge(Supplier<Number> self, Supplier<Number> reduced) Calculates reduction of tree node where self is value of the current row, and reduced is result of flat reduction.
Number	reduce(List<Number> list) Reduces the list of values to one value.

Methods inherited from class SingleDependencyReducingAggregateLoader

getAttributeDependencies, getSelfValue

Methods inherited from class ReducingAggregateLoader

loadValue

Methods inherited from class AbstractAggregateLoader

firstChildError

Methods inherited from class AbstractAttributeLoader

getAttributeSpec, toString

Methods inherited from class Object

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

Methods inherited from interface ValueReducer

convert

Methods inherited from interface MultiRowAttributeLoader

getCachingStrategy

Methods inherited from interface RowAttributeLoader

isWholeForestDependent, preload

Methods inherited from interface AttributeLoader

getAttributeSpec, getContextDependencies, getGlobalTrail

Constructor Detail

NumberSumLoader

public NumberSumLoader(AttributeSpec<Number> spec,
                       AttributeSpec<Number> dependency)

Method Detail

reduce

public Number reduce(@NotNull
                     List<Number> list)

Description copied from interface: ValueReducer

Reduces the list of values to one value. Describes 'flat' reduction of elements without hierarchy. Called reducing direct children values or from merge methods if not overridden. Can be called from convert method

Parameters:

list - list of values, every item can be null

Returns:

value after reduction, null means undefined

merge

public Number merge(@NotNull
                    Supplier<Number> self,
                    @NotNull
                    Supplier<Number> reduced)

Description copied from interface: ValueReducer

Calculates reduction of tree node where self is value of the current row, and reduced is result of flat reduction. Value modifications can be done here if one wants to build reduction that computes value based on depth in the structure. Called from strict subtree reduction strategy or from other merge method if not optimized.

merge

public Number merge(Supplier<Number> self,
                    List<Number> list)

Description copied from interface: ValueReducer

Calculates reduction of tree node where self is value of the current row and list represents values passed from children (it may be or be not values of children rows depending on strategy type). Value modifications can be done here if one wants to build reduction that computes value based on depth in the structure. Called from full subtree reduction strategy, that is default and the most frequently used strategy for most reducing aggregates (it makes this method the most probable target for optimization).