Package com.almworks.jira.structure.api.attribute.loader.reduce

Class ReductionStrategy.ChildrenReductionStrategy<T>

Object

ReductionStrategy.AbstractReductionStrategy<T>

ChildrenReductionStrategy<T>

All Implemented Interfaces:

ReductionStrategy<T>

Enclosing interface:

ReductionStrategy<T>

public static class ReductionStrategy.ChildrenReductionStrategy<T>
extends ReductionStrategy.AbstractReductionStrategy<T>

Main value: the aggregation based only on children.

Additional data: AttributeValue<T> that contains only self value of the row.

Calculation idea: sum the additional values from all children.

Nested Class Summary

Nested classes/interfaces inherited from interface ReductionStrategy

ReductionStrategy.AbstractReductionStrategy<T>, ReductionStrategy.ChildrenReductionStrategy<T>, ReductionStrategy.LeavesReductionStrategy<T>, ReductionStrategy.StrictReductionStrategy<T>, ReductionStrategy.SubtreeReductionStrategy<T>

Constructor Summary

Constructors

Constructor	Description
ChildrenReductionStrategy()

Method Summary

Modifier and Type	Method	Description
AttributeValue<T>	apply(Supplier<AttributeValue<T>> selfSupplier, List<AttributeValue<T>> children, ValueReducer<T> reducer)	Reduce value of the current node and children values to the single value using the specified ValueReducer.

Methods inherited from class Object

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

Constructor Details

ChildrenReductionStrategy

public ChildrenReductionStrategy()

Method Details

apply

@NotNull
public AttributeValue<T> apply(@NotNull
 Supplier<AttributeValue<T>> selfSupplier,
 @NotNull
 List<AttributeValue<T>> children,
 @NotNull
 ValueReducer<T> reducer)

Description copied from interface: ReductionStrategy

Reduce value of the current node and children values to the single value using the specified ValueReducer. This method is designed to be used from AttributeLoader.Aggregate. Reduction can be performed over any subtree and it's assumed that every ReductionStrategy describes in this method a reduction for a single known subtree type.

Parameters:

selfSupplier - supplier for value of current row. Supplier can be or be not called from this method depending on type of subtree this strategy describes. It's assumed that calling supplier can be heavy operation so it shouldn't be called more than once for each row from this method.

children - values of direct children rows supplied by AttributeLoader.Aggregate.loadValue

reducer - instance that is responsible for reducing but can ignore actual form of handled subtree

Returns:

reduced subtree value