Package ch.tocco.nice2.persist.core.impl.hibernate.query.selection

Class ToManySelectionPathHandler

java.lang.Object

ch.tocco.nice2.persist.core.impl.hibernate.query.selection.AbstractToManySelectionPathHandler

ch.tocco.nice2.persist.core.impl.hibernate.query.selection.ToManySelectionPathHandler

All Implemented Interfaces:

SelectionPathHandler

public class ToManySelectionPathHandler
extends AbstractToManySelectionPathHandler

SelectionPathHandler for all to-many fields (except binaries). This handler does not add anything to the query directly - to-many paths would return multiple rows per result, which would cause issues with pagination. Instead, an additional query is executed to fetch all the to-many values for the results of the primary query. One query is executed per 'path-group' (all fields that belong to the same path).

Nested Class Summary

Nested classes/interfaces inherited from class ch.tocco.nice2.persist.core.impl.hibernate.query.selection.AbstractToManySelectionPathHandler

AbstractToManySelectionPathHandler.QueryHolder

Field Summary

Fields inherited from class ch.tocco.nice2.persist.core.impl.hibernate.query.selection.AbstractToManySelectionPathHandler

criteriaBuilder, dataModel, fieldResolver, interceptors, parameterProviders, paths, predicateFactory, queries, rootKeyName, rootModel, selectionInterceptorMap, session, typeManager

Constructor Summary

Constructors

Constructor	Description
ToManySelectionPathHandler(DataModel dataModel, TypeManager typeManager, FieldResolver fieldResolver, EntityModel rootModel, PredicateFactory predicateFactory, List<QueryBuilderInterceptor> interceptors, Map<String,ParameterProvider<?>> parameterProviders, org.hibernate.Session session, CriteriaBuilderWrapper criteriaBuilder)

Method Summary

Modifier and Type	Method	Description
protected void	processAdditionalQuery(AbstractToManySelectionPathHandler.QueryHolder queryHolder, List<Path> paths)
<RT> void	processResults(List<Object[]> queryResults, List<RT> target, SelectionRegistry selectionRegistry, ResultRowMapper<RT> mapper)	This is called after the query was executed.
void	select(Path path)
boolean	supports(Path path)	All to-many fields except binaries are supported.

Methods inherited from class ch.tocco.nice2.persist.core.impl.hibernate.query.selection.AbstractToManySelectionPathHandler

doLoadData, extractAllRootPrimaryKeys, processSelection

Methods inherited from class java.lang.Object

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

Constructor Details

ToManySelectionPathHandler

public ToManySelectionPathHandler(DataModel dataModel,
 TypeManager typeManager,
 FieldResolver fieldResolver,
 EntityModel rootModel,
 PredicateFactory predicateFactory,
 List<QueryBuilderInterceptor> interceptors,
 Map<String,ParameterProvider<?>> parameterProviders,
 org.hibernate.Session session,
 CriteriaBuilderWrapper criteriaBuilder)

Method Details

supports

public boolean supports(Path path)

All to-many fields except binaries are supported.

Returns:

true if this instance supports the given path.

select

public void select(Path path)

Parameters:

path - a path that should be selected by this handler.

processAdditionalQuery

protected void processAdditionalQuery(AbstractToManySelectionPathHandler.QueryHolder queryHolder,
 List<Path> paths)

Specified by:

processAdditionalQuery in class AbstractToManySelectionPathHandler

processResults

public <RT> void processResults(List<Object[]> queryResults,
 List<RT> target,
 SelectionRegistry selectionRegistry,
 ResultRowMapper<RT> mapper)

Description copied from interface: SelectionPathHandler

This is called after the query was executed. The handler is expected to map the query results to the target array that is returned from the query builder.

Parameters:

queryResults - the query result, contains all paths added during SelectionPathHandler.processSelection(SelectionRegistry)

target - the list of arrays that will be returned from the query builder