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

Class SimpleDerivedAttributeLoader<T,D>

Object

AbstractAttributeLoader<T>

AbstractDerivedAttributeLoader<T>

SimpleDerivedAttributeLoader<T,D>

All Implemented Interfaces:

AttributeLoader<T>, DerivedAttributeLoader<T>

Direct Known Subclasses:

UniDerivedAttributeLoaderBuilder.BuiltDerivedLoader

public abstract class SimpleDerivedAttributeLoader<T,D>
extends AbstractDerivedAttributeLoader<T>

Field Summary

Fields

Modifier and Type	Field and Description
protected AttributeSpec<? extends D>	myDependency

Fields inherited from class AbstractAttributeLoader

mySpec

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SimpleDerivedAttributeLoader(AttributeSpec<T> spec, AttributeSpec<? extends D> dependency)
protected	SimpleDerivedAttributeLoader(AttributeSpec<T> spec, AttributeSpec<? extends D> dependency, boolean yield)

Method Summary

Modifier and Type	Method and Description
Set<AttributeSpec<?>>	getAttributeDependencies() Returns attributes that need to be loaded prior to calling this loader's loading function.
protected abstract T	getValue(D value, DerivedAttributeContext context)
static <T> AttributeLoader<T>	idLoader(AttributeSpec<T> spec, AttributeSpec<T> dependency)
AttributeValue<T>	loadValue(DerivedAttributeContext context) Performs the loading.

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 AttributeLoader

getAttributeSpec, getCachingStrategy, getContextDependencies, getGlobalTrail

Field Detail

myDependency

protected final AttributeSpec<? extends D> myDependency

Constructor Detail

SimpleDerivedAttributeLoader

protected SimpleDerivedAttributeLoader(AttributeSpec<T> spec,
                                       AttributeSpec<? extends D> dependency)

SimpleDerivedAttributeLoader

protected SimpleDerivedAttributeLoader(AttributeSpec<T> spec,
                                       AttributeSpec<? extends D> dependency,
                                       boolean yield)

Parameters:

spec -

dependency -

yield - if true, then error and null values will be returned as null, thus allowing other loaders to provide other values for the attribute; if false, this method will always return something

Method Detail

getAttributeDependencies

public final Set<AttributeSpec<?>> getAttributeDependencies()

Description copied from interface: AttributeLoader

Returns attributes that need to be loaded prior to calling this loader's loading function.

The returned value must be the same throughout the lifetime of the object.

Returns:

the set of attribute dependencies, or null if there are none

See Also:

AttributeLoaderContext.getDependencyValue(com.almworks.jira.structure.api.attribute.AttributeSpec<V>)

loadValue

public AttributeValue<T> loadValue(DerivedAttributeContext context)

Description copied from interface: DerivedAttributeLoader

Performs the 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.

Parameters:

context - loading context

Returns:

the calculated value

getValue

@Nullable
protected abstract T getValue(@NotNull
                                        D value,
                                        DerivedAttributeContext context)

Parameters:

value -

context -

Returns:

null if the result should be undefined (or yielded to other loaders)

idLoader

public static <T> AttributeLoader<T> idLoader(AttributeSpec<T> spec,
                                              AttributeSpec<T> dependency)