org.hibernate.loader
Class JoinWalker

java.lang.Object
  org.hibernate.loader.JoinWalker

Direct Known Subclasses:

AbstractEntityJoinWalker, CollectionJoinWalker

public class JoinWalker
extends Object

Walks the metamodel, searching for joins, and collecting together information needed by OuterJoinLoader.

Author:

Gavin King, Jon Lipsky

See Also:

OuterJoinLoader

Field Summary

protected String[]	aliases
protected List	associations
protected int[]	collectionOwners
protected CollectionPersister[]	collectionPersisters
protected String[]	collectionSuffixes
protected LockMode[]	lockModeArray
protected LockOptions	lockOptions
protected EntityType[]	ownerAssociationTypes
protected int[]	owners
protected Loadable[]	persisters
protected String	sql
protected String[]	suffixes

Constructor Summary

protected

JoinWalker(SessionFactoryImplementor factory, LoadQueryInfluencers loadQueryInfluencers)

Method Summary

protected static int	countCollectionPersisters(List associations) Count the number of instances of Joinable which are actually also instances of PersistentCollection which are being fetched by outer join
protected static int	countEntityPersisters(List associations) Count the number of instances of Joinable which are actually also instances of Loadable, or are one-to-many associations
protected String	generateRootAlias(String description)
protected String	generateTableAlias(int n, String path, Joinable joinable)
String[]	getAliases()
int[]	getCollectionOwners()
CollectionPersister[]	getCollectionPersisters()
String[]	getCollectionSuffixes()
protected Dialect	getDialect()
protected SessionFactoryImplementor	getFactory()
protected int	getJoinType(AssociationType associationType, FetchMode config, String path, String lhsTable, String[] lhsColumns, boolean nullable, int currentDepth, CascadeStyle cascadeStyle) Determine the appropriate associationType of join (if any) to use to fetch the given association.
protected int	getJoinType(boolean nullable, int currentDepth) Use an inner join if it is a non-null association and this is the "first" join in a series
protected int	getJoinType(OuterJoinLoadable persister, String path, int propertyNumber, AssociationType associationType, FetchMode metadataFetchMode, CascadeStyle metadataCascadeStyle, String lhsTable, String[] lhsColumns, boolean nullable, int currentDepth) Determine the appropriate type of join (if any) to use to fetch the given association.
LoadQueryInfluencers	getLoadQueryInfluencers()
LockMode[]	getLockModeArray()
LockOptions	getLockModeOptions()
EntityType[]	getOwnerAssociationTypes()
int[]	getOwners()
Loadable[]	getPersisters()
String	getSQLString()
String[]	getSuffixes()
protected String	getWithClause(String path)
protected void	initPersisters(List associations, LockMode lockMode)
protected void	initPersisters(List associations, LockOptions lockOptions)
protected boolean	isDuplicateAssociation(String foreignKeyTable, String[] foreignKeyColumns) Used to detect circularities in the joined graph, note that this method is side-effecty
protected boolean	isDuplicateAssociation(String lhsTable, String[] lhsColumnNames, AssociationType type) Used to detect circularities in the joined graph, note that this method is side-effecty
protected boolean	isJoinable(int joinType, Set visitedAssociationKeys, String lhsTable, String[] lhsColumnNames, AssociationType type, int depth) Should we join this association?
protected boolean	isJoinedFetchEnabled(AssociationType type, FetchMode config, CascadeStyle cascadeStyle) Override on subclasses to enable or suppress joining of certain association types
protected boolean	isJoinedFetchEnabledInMapping(FetchMode config, AssociationType type) Does the mapping, and Hibernate default semantics, specify that this association should be fetched by outer joining
protected boolean	isTooDeep(int currentDepth)
protected boolean	isTooManyCollections()
protected static String	mergeOrderings(String ordering1, String ordering2)
protected JoinFragment	mergeOuterJoins(List associations) Generate a sequence of LEFT OUTER JOIN clauses for the given associations.
protected static String	orderBy(List associations) Get the order by string required for collection fetching
protected String	orderBy(List associations, String orderBy)
protected String	selectString(List associations) Generate a select list of columns containing all properties of the entity classes
void	setAliases(String[] aliases)
void	setCollectionOwners(int[] collectionOwners)
void	setCollectionPersisters(CollectionPersister[] collectionPersisters)
void	setCollectionSuffixes(String[] collectionSuffixes)
void	setOwnerAssociationTypes(EntityType[] ownerAssociationType)
void	setOwners(int[] owners)
void	setPersisters(Loadable[] persisters)
void	setSql(String sql)
void	setSuffixes(String[] suffixes)
protected void	walkCollectionTree(QueryableCollection persister, String alias) For a collection role, return a list of associations to be fetched by outerjoin
protected void	walkEntityTree(OuterJoinLoadable persister, String alias) Walk the association tree for an entity, adding associations which should be join fetched to the associations inst var.
protected StringBuffer	whereString(String alias, String[] columnNames, int batchSize) Render the where condition for a (batch) load by identifier / collection key

Methods inherited from class java.lang.Object

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

Field Detail

associations

protected final List associations

suffixes

protected String[] suffixes

collectionSuffixes

protected String[] collectionSuffixes

persisters

protected Loadable[] persisters

owners

protected int[] owners

ownerAssociationTypes

protected EntityType[] ownerAssociationTypes

collectionPersisters

protected CollectionPersister[] collectionPersisters

collectionOwners

protected int[] collectionOwners

aliases

protected String[] aliases

lockOptions

protected LockOptions lockOptions

lockModeArray

protected LockMode[] lockModeArray

sql

protected String sql

Constructor Detail

JoinWalker

protected JoinWalker(SessionFactoryImplementor factory,
                     LoadQueryInfluencers loadQueryInfluencers)

Method Detail

getCollectionSuffixes

public String[] getCollectionSuffixes()

setCollectionSuffixes

public void setCollectionSuffixes(String[] collectionSuffixes)

getLockModeOptions

public LockOptions getLockModeOptions()

getLockModeArray

public LockMode[] getLockModeArray()

getSuffixes

public String[] getSuffixes()

setSuffixes

public void setSuffixes(String[] suffixes)

getAliases

public String[] getAliases()

setAliases

public void setAliases(String[] aliases)

getCollectionOwners

public int[] getCollectionOwners()

setCollectionOwners

public void setCollectionOwners(int[] collectionOwners)

getCollectionPersisters

public CollectionPersister[] getCollectionPersisters()

setCollectionPersisters

public void setCollectionPersisters(CollectionPersister[] collectionPersisters)

getOwnerAssociationTypes

public EntityType[] getOwnerAssociationTypes()

setOwnerAssociationTypes

public void setOwnerAssociationTypes(EntityType[] ownerAssociationType)

getOwners

public int[] getOwners()

setOwners

public void setOwners(int[] owners)

getPersisters

public Loadable[] getPersisters()

setPersisters

public void setPersisters(Loadable[] persisters)

getSQLString

public String getSQLString()

setSql

public void setSql(String sql)

getFactory

protected SessionFactoryImplementor getFactory()

getDialect

protected Dialect getDialect()

getLoadQueryInfluencers

public LoadQueryInfluencers getLoadQueryInfluencers()

getWithClause

protected String getWithClause(String path)

walkEntityTree

protected final void walkEntityTree(OuterJoinLoadable persister,
                                    String alias)
                             throws MappingException

Walk the association tree for an entity, adding associations which should be join fetched to the associations inst var. This form is the entry point into the walking for a given entity, starting the recursive calls into walkEntityTree(OuterJoinLoadable, String, String, int).

Parameters:

persister - The persister representing the entity to be walked.

alias - The (root) alias to use for this entity/persister.

Throws:

MappingException - ???

walkCollectionTree

protected final void walkCollectionTree(QueryableCollection persister,
                                        String alias)
                                 throws MappingException

For a collection role, return a list of associations to be fetched by outerjoin

Throws:

MappingException

getJoinType

protected int getJoinType(OuterJoinLoadable persister,
                          String path,
                          int propertyNumber,
                          AssociationType associationType,
                          FetchMode metadataFetchMode,
                          CascadeStyle metadataCascadeStyle,
                          String lhsTable,
                          String[] lhsColumns,
                          boolean nullable,
                          int currentDepth)
                   throws MappingException

Determine the appropriate type of join (if any) to use to fetch the given association.

Parameters:

persister - The owner of the association.

path - The path to the association

propertyNumber - The property number representing the association.

associationType - The association type.

metadataFetchMode - The metadata-defined fetch mode.

metadataCascadeStyle - The metadata-defined cascade style.

lhsTable - The owner table

lhsColumns - The owner join columns

nullable - Is the association nullable.

currentDepth - Current join depth

Returns:

type of join to use (JoinFragment.INNER_JOIN, JoinFragment.LEFT_OUTER_JOIN, or -1 to indicate no joining.

Throws:

MappingException - ??

getJoinType

protected int getJoinType(AssociationType associationType,
                          FetchMode config,
                          String path,
                          String lhsTable,
                          String[] lhsColumns,
                          boolean nullable,
                          int currentDepth,
                          CascadeStyle cascadeStyle)
                   throws MappingException

Determine the appropriate associationType of join (if any) to use to fetch the given association.

Parameters:

associationType - The association associationType.

config - The metadata-defined fetch mode.

path - The path to the association

lhsTable - The owner table

lhsColumns - The owner join columns

nullable - Is the association nullable.

currentDepth - Current join depth

cascadeStyle - The metadata-defined cascade style.

Returns:

type of join to use (JoinFragment.INNER_JOIN, JoinFragment.LEFT_OUTER_JOIN, or -1 to indicate no joining.

Throws:

MappingException - ??

getJoinType

protected int getJoinType(boolean nullable,
                          int currentDepth)

Use an inner join if it is a non-null association and this is the "first" join in a series

isTooDeep

protected boolean isTooDeep(int currentDepth)

isTooManyCollections

protected boolean isTooManyCollections()

isJoinedFetchEnabledInMapping

protected boolean isJoinedFetchEnabledInMapping(FetchMode config,
                                                AssociationType type)
                                         throws MappingException

Does the mapping, and Hibernate default semantics, specify that this association should be fetched by outer joining

Throws:

MappingException

isJoinedFetchEnabled

protected boolean isJoinedFetchEnabled(AssociationType type,
                                       FetchMode config,
                                       CascadeStyle cascadeStyle)

Override on subclasses to enable or suppress joining of certain association types

generateTableAlias

protected String generateTableAlias(int n,
                                    String path,
                                    Joinable joinable)

generateRootAlias

protected String generateRootAlias(String description)

isDuplicateAssociation

protected boolean isDuplicateAssociation(String foreignKeyTable,
                                         String[] foreignKeyColumns)

Used to detect circularities in the joined graph, note that this method is side-effecty

isDuplicateAssociation

protected boolean isDuplicateAssociation(String lhsTable,
                                         String[] lhsColumnNames,
                                         AssociationType type)

Used to detect circularities in the joined graph, note that this method is side-effecty

isJoinable

protected boolean isJoinable(int joinType,
                             Set visitedAssociationKeys,
                             String lhsTable,
                             String[] lhsColumnNames,
                             AssociationType type,
                             int depth)

Should we join this association?

orderBy

protected String orderBy(List associations,
                         String orderBy)

mergeOrderings

protected static String mergeOrderings(String ordering1,
                                       String ordering2)

mergeOuterJoins

protected final JoinFragment mergeOuterJoins(List associations)
                                      throws MappingException

Generate a sequence of LEFT OUTER JOIN clauses for the given associations.

Throws:

MappingException

countEntityPersisters

protected static final int countEntityPersisters(List associations)
                                          throws MappingException

Count the number of instances of Joinable which are actually also instances of Loadable, or are one-to-many associations

Throws:

MappingException

countCollectionPersisters

protected static final int countCollectionPersisters(List associations)
                                              throws MappingException

Count the number of instances of Joinable which are actually also instances of PersistentCollection which are being fetched by outer join

Throws:

MappingException

orderBy

protected static final String orderBy(List associations)
                               throws MappingException

Get the order by string required for collection fetching

Throws:

MappingException

whereString

protected StringBuffer whereString(String alias,
                                   String[] columnNames,
                                   int batchSize)

Render the where condition for a (batch) load by identifier / collection key

initPersisters

protected void initPersisters(List associations,
                              LockMode lockMode)
                       throws MappingException

Throws:

MappingException

initPersisters

protected void initPersisters(List associations,
                              LockOptions lockOptions)
                       throws MappingException

Throws:

MappingException

selectString

protected final String selectString(List associations)
                             throws MappingException

Generate a select list of columns containing all properties of the entity classes

Throws:

MappingException