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

Class AbstractNaiveDistinctAggregateLoader<T>

Object

AbstractAttributeLoader<T>

AbstractAggregateLoader<T>

AbstractNaiveDistinctAggregateLoader<T>

All Implemented Interfaces:

AggregateAttributeLoader<T>, AttributeLoader<T>, MultiRowAttributeLoader<T>, RowAttributeLoader<T>

public abstract class AbstractNaiveDistinctAggregateLoader<T>
extends AbstractAggregateLoader<T>

Field Summary

Fields inherited from class AbstractAttributeLoader

mySpec

Constructor Summary

Constructors

Constructor and Description
AbstractNaiveDistinctAggregateLoader(AttributeSpec<T> spec)

Method Summary

Modifier and Type	Method and Description
protected abstract T	combine(Collection<T> values, AggregateAttributeContext context)
protected abstract T	getRowValue(RowAttributeContext context)
AttributeValue<T>	loadValue(List<AttributeValue<T>> childrenValues, AggregateAttributeContext context) Performs aggregate loading.

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 MultiRowAttributeLoader

getCachingStrategy

Methods inherited from interface RowAttributeLoader

isWholeForestDependent, preload

Methods inherited from interface AttributeLoader

getAttributeDependencies, getAttributeSpec, getContextDependencies, getGlobalTrail

Constructor Detail

AbstractNaiveDistinctAggregateLoader

public AbstractNaiveDistinctAggregateLoader(AttributeSpec<T> spec)

Method Detail

loadValue

public AttributeValue<T> loadValue(List<AttributeValue<T>> childrenValues,
                                   AggregateAttributeContext context)

Description copied from interface: AggregateAttributeLoader

Performs aggregate loading.

If the value is missing or empty, the loader should return AttributeValue.undefined(). If for some reason this loader is not applicable for the given row, it should return null. (Note, however, that if multiple aggregate loaders work on the same attribute, it could be tricky and lead to unexpected results.)

Note: children values may contain loop markers

Parameters:

childrenValues - the values of this attribute for all children rows, in the same order as the children rows

context - loading context

Returns:

the calculated value

getRowValue

protected abstract T getRowValue(RowAttributeContext context)

combine

protected abstract T combine(Collection<T> values,
                             AggregateAttributeContext context)