Package io.agrest.cayenne.processor.select

Class ViaParentPrefetchResolver

java.lang.Object

io.agrest.resolver.BaseDataResolver

io.agrest.resolver.BaseRelatedDataResolver<org.apache.cayenne.DataObject>

io.agrest.cayenne.processor.select.ViaParentPrefetchResolver

All Implemented Interfaces:

RelatedDataResolver<org.apache.cayenne.DataObject>

public class ViaParentPrefetchResolver
extends BaseRelatedDataResolver<org.apache.cayenne.DataObject>

A resolver that doesn't run its own queries, but instead amends parent node query with prefetch spec, so that the objects can be read efficiently from the parent objects. Also allows to explicitly set the prefetch semantics.

Since:

3.4

Constructor Summary

Constructors

Constructor	Description
ViaParentPrefetchResolver(int prefetchSemantics)

Method Summary

Modifier and Type	Method	Description
protected void	addRelatedPrefetch(RelatedResourceEntity<?> entity, String path, int prefetchSemantics)
protected void	addRootPrefetch(RootResourceEntity<?> entity, String path, int prefetchSemantics)
DataReader	dataReader(RelatedResourceEntity<org.apache.cayenne.DataObject> entity, ProcessingContext<?> context)
protected Iterable<org.apache.cayenne.DataObject>	doOnParentDataResolved(RelatedResourceEntity<org.apache.cayenne.DataObject> entity, Iterable<?> parentData, SelectContext<?> context)
protected void	doOnParentQueryAssembled(RelatedResourceEntity<org.apache.cayenne.DataObject> entity, SelectContext<?> context)
protected Iterable<org.apache.cayenne.DataObject>	iterableData(RelatedResourceEntity<org.apache.cayenne.DataObject> entity, Iterable<? extends org.apache.cayenne.DataObject> parentData, ProcessingContext<?> context)

Methods inherited from class io.agrest.resolver.BaseRelatedDataResolver

onParentDataResolved, onParentQueryAssembled

Methods inherited from class io.agrest.resolver.BaseDataResolver

afterDataFetched, afterQueryAssembled

Methods inherited from class java.lang.Object

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

Constructor Details

ViaParentPrefetchResolver

public ViaParentPrefetchResolver(int prefetchSemantics)

Method Details

doOnParentQueryAssembled

protected void doOnParentQueryAssembled(RelatedResourceEntity<org.apache.cayenne.DataObject> entity,
 SelectContext<?> context)

Specified by:

doOnParentQueryAssembled in class BaseRelatedDataResolver<org.apache.cayenne.DataObject>

doOnParentDataResolved

protected Iterable<org.apache.cayenne.DataObject> doOnParentDataResolved(RelatedResourceEntity<org.apache.cayenne.DataObject> entity,
 Iterable<?> parentData,
 SelectContext<?> context)

Specified by:

doOnParentDataResolved in class BaseRelatedDataResolver<org.apache.cayenne.DataObject>

addRelatedPrefetch

protected void addRelatedPrefetch(RelatedResourceEntity<?> entity,
 String path,
 int prefetchSemantics)

addRootPrefetch

protected void addRootPrefetch(RootResourceEntity<?> entity,
 String path,
 int prefetchSemantics)

dataReader

public DataReader dataReader(RelatedResourceEntity<org.apache.cayenne.DataObject> entity,
 ProcessingContext<?> context)

Specified by:

dataReader in interface RelatedDataResolver<org.apache.cayenne.DataObject>

Specified by:

dataReader in class BaseRelatedDataResolver<org.apache.cayenne.DataObject>

iterableData

protected Iterable<org.apache.cayenne.DataObject> iterableData(RelatedResourceEntity<org.apache.cayenne.DataObject> entity,
 Iterable<? extends org.apache.cayenne.DataObject> parentData,
 ProcessingContext<?> context)