Package org.hibernate.sql.ast.tree.from

Class LazyTableGroup

java.lang.Object

org.hibernate.sql.ast.tree.from.DelegatingTableGroup

org.hibernate.sql.ast.tree.from.LazyTableGroup

All Implemented Interfaces:

DomainResultProducer, SqmPathInterpretation, SqlSelectionProducer, Expression, ColumnReferenceQualifier, TableGroup, SqlAstNode

public class LazyTableGroup
extends DelegatingTableGroup

The purpose of this table group is to defer creating the actual table group until it is really needed. If it is not needed, we can safely skip rendering it. This is useful for ToOneAttributeMapping and EntityCollectionPart, where we need a table group for the association, but aren't sure which columns are needed yet. Deferring initialization enables getting away with fewer joins in case only foreign key columns are used.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	LazyTableGroup.ParentTableGroupUseChecker

Constructor Summary

Constructors

Constructor	Description
LazyTableGroup(boolean canUseInnerJoins, NavigablePath navigablePath, boolean fetched, Supplier<TableGroup> tableGroupSupplier, LazyTableGroup.ParentTableGroupUseChecker parentTableGroupUseChecker, TableGroupProducer tableGroupProducer, String sourceAlias, SqlAliasBase sqlAliasBase, SessionFactoryImplementor sessionFactory, TableGroup parentTableGroup)

Method Summary

Modifier and Type	Method	Description
void	addNestedTableGroupJoin(TableGroupJoin join)	A nested table group join is a join against a table group, that is ensured to be joined against the primary table reference and table reference joins in isolation, prior to doing other table group joins e.g.
void	addTableGroupJoin(TableGroupJoin join)
void	applyAffectedTableNames(Consumer<String> nameCollector)
boolean	canUseInnerJoins()
ModelPart	getExpressionType()	The type for this expression
String	getGroupAlias()	If we want to use CTE for TableGroup rendering we will need to know the alias we can use for the group
TableGroupProducer	getModelPart()
NavigablePath	getNavigablePath()
List<TableGroupJoin>	getNestedTableGroupJoins()
String	getSourceAlias()
TableGroup	getTableGroup()
List<TableGroupJoin>	getTableGroupJoins()
TableReference	getTableReference(NavigablePath navigablePath, String tableExpression, boolean resolve)	Returns the table reference for the table expression, or null if not found.
TableReference	getTableReference(NavigablePath navigablePath, ValuedModelPart modelPart, String tableExpression, boolean resolve)
List<TableReferenceJoin>	getTableReferenceJoins()
TableGroup	getUnderlyingTableGroup()
boolean	isFetched()
boolean	isInitialized()	If this is a lazy table group, it may report that it is not initialized, which would also mean that a join referring to this table group should not be rendered.
boolean	isLateral()
boolean	isRealTableGroup()
void	setTableGroupInitializerCallback(Consumer<TableGroup> tableGroupConsumer)
void	visitNestedTableGroupJoins(Consumer<TableGroupJoin> consumer)
void	visitTableGroupJoins(Consumer<TableGroupJoin> consumer)

Methods inherited from class org.hibernate.sql.ast.tree.from.DelegatingTableGroup

accept, applySqlSelections, createDomainResult, createSqlSelection, getColumnReference, getPrimaryTableReference, getSqlExpression, prependTableGroupJoin

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.hibernate.sql.ast.tree.from.ColumnReferenceQualifier

getTableReference, getTableReference, resolveTableReference, resolveTableReference, resolveTableReference

Methods inherited from interface org.hibernate.sql.ast.tree.expression.Expression

createDomainResultSqlSelection

Methods inherited from interface org.hibernate.sql.ast.tree.from.TableGroup

findCompatibleJoin, findCompatibleJoinedGroup, findTableGroupJoin, findTableReference, hasRealJoins, isVirtual

Constructor Details

LazyTableGroup

public LazyTableGroup(boolean canUseInnerJoins,
 NavigablePath navigablePath,
 boolean fetched,
 Supplier<TableGroup> tableGroupSupplier,
 LazyTableGroup.ParentTableGroupUseChecker parentTableGroupUseChecker,
 TableGroupProducer tableGroupProducer,
 String sourceAlias,
 SqlAliasBase sqlAliasBase,
 SessionFactoryImplementor sessionFactory,
 TableGroup parentTableGroup)

Method Details

isInitialized

public boolean isInitialized()

Description copied from interface: TableGroup

If this is a lazy table group, it may report that it is not initialized, which would also mean that a join referring to this table group should not be rendered.

Specified by:

isInitialized in interface TableGroup

Overrides:

isInitialized in class DelegatingTableGroup

getUnderlyingTableGroup

public TableGroup getUnderlyingTableGroup()

getTableGroup

public TableGroup getTableGroup()

Specified by:

getTableGroup in class DelegatingTableGroup

setTableGroupInitializerCallback

public void setTableGroupInitializerCallback(Consumer<TableGroup> tableGroupConsumer)

applyAffectedTableNames

public void applyAffectedTableNames(Consumer<String> nameCollector)

Specified by:

applyAffectedTableNames in interface TableGroup

Overrides:

applyAffectedTableNames in class DelegatingTableGroup

getTableReferenceJoins

public List<TableReferenceJoin> getTableReferenceJoins()

Specified by:

getTableReferenceJoins in interface TableGroup

Overrides:

getTableReferenceJoins in class DelegatingTableGroup

getTableGroupJoins

public List<TableGroupJoin> getTableGroupJoins()

Specified by:

getTableGroupJoins in interface TableGroup

Overrides:

getTableGroupJoins in class DelegatingTableGroup

getNestedTableGroupJoins

public List<TableGroupJoin> getNestedTableGroupJoins()

Specified by:

getNestedTableGroupJoins in interface TableGroup

Overrides:

getNestedTableGroupJoins in class DelegatingTableGroup

addTableGroupJoin

public void addTableGroupJoin(TableGroupJoin join)

Specified by:

addTableGroupJoin in interface TableGroup

Overrides:

addTableGroupJoin in class DelegatingTableGroup

addNestedTableGroupJoin

public void addNestedTableGroupJoin(TableGroupJoin join)

Description copied from interface: TableGroup

A nested table group join is a join against a table group, that is ensured to be joined against the primary table reference and table reference joins in isolation, prior to doing other table group joins e.g. select * from entity1 e left join ( collection_table c1 join association a on a.id = c1.target_id ) on c1.entity_id = e.id and c1.key = 1 is modeled as TableGroup( primaryTableReference = TableReference(entity1, e), tableGroupJoins = [ TableGroupJoin( TableGroup( primaryTableReference = TableReference(collection_table, c1), nestedTableGroupJoins = [ TableGroupJoin( TableGroup( primaryTableReference = TableReference(association, a) ) ) ] ) ) ] ) This is necessary to correctly retain the cardinality of an HQL join like e.g. from Entity1 e left join e.collectionAssociation c on key(c) = 1

Specified by:

addNestedTableGroupJoin in interface TableGroup

Overrides:

addNestedTableGroupJoin in class DelegatingTableGroup

visitTableGroupJoins

public void visitTableGroupJoins(Consumer<TableGroupJoin> consumer)

Specified by:

visitTableGroupJoins in interface TableGroup

Overrides:

visitTableGroupJoins in class DelegatingTableGroup

visitNestedTableGroupJoins

public void visitNestedTableGroupJoins(Consumer<TableGroupJoin> consumer)

Specified by:

visitNestedTableGroupJoins in interface TableGroup

Overrides:

visitNestedTableGroupJoins in class DelegatingTableGroup

canUseInnerJoins

public boolean canUseInnerJoins()

Specified by:

canUseInnerJoins in interface TableGroup

Overrides:

canUseInnerJoins in class DelegatingTableGroup

getNavigablePath

public NavigablePath getNavigablePath()

Specified by:

getNavigablePath in interface SqmPathInterpretation

Specified by:

getNavigablePath in interface TableGroup

Overrides:

getNavigablePath in class DelegatingTableGroup

getGroupAlias

public String getGroupAlias()

Description copied from interface: TableGroup

If we want to use CTE for TableGroup rendering we will need to know the alias we can use for the group

Specified by:

getGroupAlias in interface TableGroup

Overrides:

getGroupAlias in class DelegatingTableGroup

getModelPart

public TableGroupProducer getModelPart()

Specified by:

getModelPart in interface TableGroup

Overrides:

getModelPart in class DelegatingTableGroup

getExpressionType

public ModelPart getExpressionType()

Description copied from interface: Expression

The type for this expression

Specified by:

getExpressionType in interface Expression

Specified by:

getExpressionType in interface SqmPathInterpretation

Overrides:

getExpressionType in class DelegatingTableGroup

getSourceAlias

public String getSourceAlias()

Specified by:

getSourceAlias in interface TableGroup

Overrides:

getSourceAlias in class DelegatingTableGroup

isRealTableGroup

public boolean isRealTableGroup()

Specified by:

isRealTableGroup in interface TableGroup

Overrides:

isRealTableGroup in class DelegatingTableGroup

isFetched

public boolean isFetched()

Specified by:

isFetched in interface TableGroup

Overrides:

isFetched in class DelegatingTableGroup

isLateral

public boolean isLateral()

Specified by:

isLateral in interface TableGroup

Overrides:

isLateral in class DelegatingTableGroup

getTableReference

public TableReference getTableReference(NavigablePath navigablePath,
 String tableExpression,
 boolean resolve)

Description copied from interface: ColumnReferenceQualifier

Returns the table reference for the table expression, or null if not found.

Specified by:

getTableReference in interface ColumnReferenceQualifier

Overrides:

getTableReference in class DelegatingTableGroup

Parameters:

navigablePath - The path for which to look up the table reference, may be null

tableExpression - The table expression for which to look up the table reference

resolve - Whether to potentially create table reference joins for this table group

getTableReference

public TableReference getTableReference(NavigablePath navigablePath,
 ValuedModelPart modelPart,
 String tableExpression,
 boolean resolve)

Specified by:

getTableReference in interface ColumnReferenceQualifier

Overrides:

getTableReference in class DelegatingTableGroup