org.datanucleus.store.rdbms.table

Class ClassTable

java.lang.Object

org.datanucleus.store.rdbms.table.AbstractTable

org.datanucleus.store.rdbms.table.TableImpl

org.datanucleus.store.rdbms.table.AbstractClassTable

org.datanucleus.store.rdbms.table.ClassTable

All Implemented Interfaces:

DatastoreClass, org.datanucleus.store.schema.table.Table

public class ClassTable
extends AbstractClassTable
implements DatastoreClass

Table representing a Java class (or classes) as a first class object (FCO). Uses the inheritance strategy to control whether this represents multiple classes or just the one class.

Mappings

This class adds some additional mappings over what the superclass provides. Here we add

• externalFkMappings - any mappings for Collections that have no associated field in this class, providing the foreign key column(s)
• externalOrderMappings - mappings for any ordering column used by Lists for ordering elements of this class
• externalFkDiscriminatorMappings - mappings for any discriminator column used when sharing external foreign keys to distinguish the element owner field

Classes

A table can represent multiple classes. It has a nominal owner which is the class that has an inheritance strategy of "new-table". All classes that utilise this table have their MetaData stored in this object.

Secondary Tables

This class represents a "primary" table. That is, the main table where objects of a class are persisted. It can have several "secondary" tables where some of the classes fields are stored at persistence.

Field Summary

Fields

Modifier and Type	Field and Description
protected String	managingClassCurrent Name of class currently being processed in manageClass (if any).
protected boolean	runCallbacksAfterManageClass Flag to run the callbacks after the current class is managed fully.

Fields inherited from class org.datanucleus.store.rdbms.table.AbstractClassTable

datastoreIDMapping, discriminatorMapping, discriminatorMetaData, highestMemberNumber, idMapping, memberMappingsMap, pkMappings, tenantMapping, versionMapping, versionMetaData

Fields inherited from class org.datanucleus.store.rdbms.table.AbstractTable

columns, columnsByName, dba, existsInDatastore, identifier, state, storeMgr, TABLE_STATE_INITIALIZED, TABLE_STATE_INITIALIZED_MODIFIED, TABLE_STATE_NEW, TABLE_STATE_PK_INITIALIZED, TABLE_STATE_VALIDATED

Constructor Summary

Constructors

Constructor and Description
ClassTable(DatastoreIdentifier tableName, RDBMSStoreManager storeMgr, org.datanucleus.metadata.ClassMetaData cmd) Constructor.

Method Summary

Modifier and Type	Method and Description
DatastoreClass	getBaseDatastoreClass() Accessor for the base datastore class.
DatastoreClass	getBaseDatastoreClassWithMember(org.datanucleus.metadata.AbstractMemberMetaData mmd) Convenience accessor for the base table for this table which has the specified field.
org.datanucleus.metadata.ClassMetaData	getClassMetaData() Accessor for the (primary) class MetaData.
JavaTypeMapping	getDiscriminatorMapping(boolean allowSuperclasses) Accessor for the discriminator mapping specified .
org.datanucleus.metadata.DiscriminatorMetaData	getDiscriminatorMetaData() Accessor for Discriminator MetaData
protected List	getExpectedCandidateKeys() Accessor for the expected candidate keys for this table.
List	getExpectedForeignKeys(org.datanucleus.ClassLoaderResolver clr) Accessor for the expected foreign keys for this table.
protected Set	getExpectedIndices(org.datanucleus.ClassLoaderResolver clr) Accessor for the indices for this table.
JavaTypeMapping	getExternalMapping(org.datanucleus.metadata.AbstractMemberMetaData mmd, int mappingType) Accessor for an external mapping for the specified field of the required type.
org.datanucleus.metadata.IdentityType	getIdentityType() Accessor for the identity-type.
JavaTypeMapping	getIdMapping() Accessor for a mapping for the ID (persistable) for this table.
String[]	getManagedClasses() Accessor for the names of all classes managed by this table.
JavaTypeMapping	getMemberMapping(org.datanucleus.metadata.AbstractMemberMetaData mmd) Accessor for the field mapping for the specified field.
JavaTypeMapping	getMemberMapping(String memberName) Accessor for the field mapping for the named field.
JavaTypeMapping	getMemberMappingInDatastoreClass(org.datanucleus.metadata.AbstractMemberMetaData mmd) Accessor for the mapping for the specified field only in this datastore class.
org.datanucleus.metadata.AbstractMemberMetaData	getMetaDataForExternalMapping(JavaTypeMapping mapping, int mappingType) Accessor for the MetaData for the (owner) field that an external mapping corresponds to.
PrimaryKey	getPrimaryKey() Accessor for the primary key for this table.
Collection	getSecondaryDatastoreClasses() Accessor for any secondary tables for this table.
protected List	getSQLCreateStatements(Properties props) Accessor for the CREATE statements for this table.
protected List	getSQLDropStatements() Accessor for the DROP statements for this table.
DatastoreClass	getSuperDatastoreClass() Accessor for the supertable for this table.
ClassTable	getTableManagingMapping(JavaTypeMapping mapping)
ClassTable	getTableWithDiscriminator() Convenience method to return the root table with a discriminator in this inheritance tree.
String	getType() Accessor for the main class represented.
JavaTypeMapping	getVersionMapping(boolean allowSuperclasses) Accessor for the version mapping specified .
org.datanucleus.metadata.VersionMetaData	getVersionMetaData() Accessor for versionMetaData
boolean	hasExternalFkMappings()
void	initialize(org.datanucleus.ClassLoaderResolver clr) Method to initialise the table.
protected void	initializePK(org.datanucleus.ClassLoaderResolver clr) Method to initialise the table primary key field(s).
boolean	isBaseDatastoreClass() Whether this table is the base table in the inheritance hierarchy.
boolean	isObjectIdDatastoreAttributed() Whether this table or super table has id (primary key) attributed by the datastore
boolean	isSuperDatastoreClass(DatastoreClass table) Accessor whether the supplied DatastoreClass is a supertable of this table.
void	manageClass(org.datanucleus.metadata.AbstractClassMetaData theCmd, org.datanucleus.ClassLoaderResolver clr) Method that adds the specified class to be managed by this table.
boolean	managesClass(String className) Accessor for whether this table manages the specified class
void	postInitialize(org.datanucleus.ClassLoaderResolver clr) Post initilize.
void	preInitialize(org.datanucleus.ClassLoaderResolver clr) Pre-initialize.
void	provideExternalMappings(MappingConsumer consumer, int mappingType) Provide the mappings to the consumer for all external fields mapped to this table of the specified type
void	provideMappingsForMembers(MappingConsumer consumer, org.datanucleus.metadata.AbstractMemberMetaData[] fieldMetaData, boolean includeSecondaryTables) Provide the mappings to the consumer for all absolute field Numbers in this table that are container in the fieldNumbers parameter.
void	providePrimaryKeyMappings(MappingConsumer consumer) Provide the mappings to the consumer for all primary-key fields mapped to this table.
void	provideUnmappedColumns(MappingConsumer consumer) Method to provide all unmapped columns to the consumer.
boolean	validateConstraints(Connection conn, boolean autoCreate, Collection autoCreateErrors, org.datanucleus.ClassLoaderResolver clr) Method to validate the constraints of this table.

Methods inherited from class org.datanucleus.store.rdbms.table.AbstractClassTable

addMemberMapping, addMultitenancyMapping, getDatastoreIdColumn, getDatastoreIdMapping, getDiscriminatorColumn, getMappingForMemberName, getMultitenancyColumn, getMultitenancyMapping, getPrimaryTable, getVersionColumn, managesMapping, managesMember, provideDatastoreIdMappings, provideDiscriminatorMappings, provideMultitenancyMapping, provideNonPrimaryKeyMappings, provideVersionMappings

Methods inherited from class org.datanucleus.store.rdbms.table.TableImpl

createConstraints, dropConstraints, getSQLAddCandidateKeyStatements, getSQLAddFKStatements, getSQLCreateIndexStatements, initializeColumnInfoForPrimaryKeyColumns, initializeColumnInfoFromDatastore, logMapping, validate, validateColumns, validatePrimaryKey

Methods inherited from class org.datanucleus.store.rdbms.table.AbstractTable

addColumn, addColumnInternal, allowDDLOutput, assertIsInitialized, assertIsInitializedModified, assertIsPKInitialized, assertIsPKUninitialized, assertIsUninitialized, assertIsValidated, create, drop, equals, executeDdlStatement, executeDdlStatementList, exists, getCatalogName, getColumn, getColumnForName, getColumnForPosition, getColumns, getDatastoreIdentifierFullyQualified, getIdentifier, getMemberColumnMappingForEmbeddedMember, getMemberColumnMappingForMember, getMemberColumnMappings, getName, getNumberOfColumns, getSchemaName, getStoreManager, hasColumn, hasColumnName, hashCode, isInitialized, isInitializedModified, isPKInitialized, isValidated, tableExistsInDatastore, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.datanucleus.store.rdbms.table.DatastoreClass

getDatastoreIdMapping, managesMapping, provideDatastoreIdMappings, provideDiscriminatorMappings, provideMultitenancyMapping, provideNonPrimaryKeyMappings, provideVersionMappings, toString

Methods inherited from interface org.datanucleus.store.rdbms.table.Table

addColumn, create, drop, exists, getColumn, getIdentifier, getMultitenancyMapping, getStoreManager, hasColumn, isInitialized, isInitializedModified, isValidated, validate

Methods inherited from interface org.datanucleus.store.schema.table.Table

getCatalogName, getColumnForName, getColumnForPosition, getColumns, getDatastoreIdColumn, getDiscriminatorColumn, getMemberColumnMappingForEmbeddedMember, getMemberColumnMappingForMember, getMemberColumnMappings, getMultitenancyColumn, getName, getNumberOfColumns, getSchemaName, getVersionColumn

Field Detail

managingClassCurrent

protected transient String managingClassCurrent

Name of class currently being processed in manageClass (if any).

runCallbacksAfterManageClass

protected boolean runCallbacksAfterManageClass

Flag to run the callbacks after the current class is managed fully.

Constructor Detail

ClassTable

public ClassTable(DatastoreIdentifier tableName,
                  RDBMSStoreManager storeMgr,
                  org.datanucleus.metadata.ClassMetaData cmd)

Constructor.

Parameters:

tableName - Table name SQL identifier

storeMgr - Store Manager to manage this table

cmd - MetaData for the class.

Method Detail

preInitialize

public void preInitialize(org.datanucleus.ClassLoaderResolver clr)

Pre-initialize. We require any supertable, and the PK to be ready before we start initialisation.

Overrides:

preInitialize in class TableImpl

Parameters:

clr - the ClassLoaderResolver

initialize

public void initialize(org.datanucleus.ClassLoaderResolver clr)

Method to initialise the table. This adds the columns based on the MetaData representation for the class being represented by this table.

Parameters:

clr - The ClassLoaderResolver

postInitialize

public void postInitialize(org.datanucleus.ClassLoaderResolver clr)

Post initilize. For things that must be set after all classes have been initialized before

Overrides:

postInitialize in class TableImpl

Parameters:

clr - the ClassLoaderResolver

manageClass

public void manageClass(org.datanucleus.metadata.AbstractClassMetaData theCmd,
                        org.datanucleus.ClassLoaderResolver clr)

Method that adds the specified class to be managed by this table. Will provide mapping of all persistent fields to their underlying columns, map all necessary identity fields, and manage all "unmapped" columns that have no associated field. where the columns are defined for each mapping.

Parameters:

theCmd - ClassMetaData for the class to be managed

clr - The ClassLoaderResolver

getManagedClasses

public String[] getManagedClasses()

Accessor for the names of all classes managed by this table.

Specified by:

getManagedClasses in interface DatastoreClass

Returns:

Names of the classes managed (stored) here

managesClass

public boolean managesClass(String className)

Accessor for whether this table manages the specified class

Specified by:

managesClass in interface DatastoreClass

Parameters:

className - Name of the class

Returns:

Whether it is managed by this table

initializePK

protected void initializePK(org.datanucleus.ClassLoaderResolver clr)

Method to initialise the table primary key field(s).

Specified by:

initializePK in class AbstractClassTable

Parameters:

clr - The ClassLoaderResolver

getType

public String getType()

Accessor for the main class represented.

Specified by:

getType in interface DatastoreClass

Returns:

The name of the class

getIdentityType

public org.datanucleus.metadata.IdentityType getIdentityType()

Accessor for the identity-type.

Specified by:

getIdentityType in interface DatastoreClass

Specified by:

getIdentityType in class AbstractClassTable

Returns:

identity-type tag value

getVersionMetaData

public final org.datanucleus.metadata.VersionMetaData getVersionMetaData()

Accessor for versionMetaData

Overrides:

getVersionMetaData in class AbstractTable

Returns:

Returns the versionMetaData.

getDiscriminatorMetaData

public final org.datanucleus.metadata.DiscriminatorMetaData getDiscriminatorMetaData()

Accessor for Discriminator MetaData

Overrides:

getDiscriminatorMetaData in class AbstractTable

Returns:

Returns the Discriminator MetaData.

getTableWithDiscriminator

public final ClassTable getTableWithDiscriminator()

Convenience method to return the root table with a discriminator in this inheritance tree.

Returns:

The root table which has the discriminator in this inheritance tree

isObjectIdDatastoreAttributed

public boolean isObjectIdDatastoreAttributed()

Whether this table or super table has id (primary key) attributed by the datastore

Specified by:

isObjectIdDatastoreAttributed in interface DatastoreClass

Specified by:

isObjectIdDatastoreAttributed in class AbstractClassTable

Returns:

true if the id attributed by the datastore

isBaseDatastoreClass

public boolean isBaseDatastoreClass()

Whether this table is the base table in the inheritance hierarchy.

Specified by:

isBaseDatastoreClass in interface DatastoreClass

Returns:

true if this table is a root table

getBaseDatastoreClass

public DatastoreClass getBaseDatastoreClass()

Description copied from interface: DatastoreClass

Accessor for the base datastore class. Returns this object if it has no superclass table, otherwise goes up to the superclass etc.

Specified by:

getBaseDatastoreClass in interface DatastoreClass

Returns:

The base datastore class

getSuperDatastoreClass

public DatastoreClass getSuperDatastoreClass()

Accessor for the supertable for this table.

Specified by:

getSuperDatastoreClass in interface DatastoreClass

Returns:

The supertable

isSuperDatastoreClass

public boolean isSuperDatastoreClass(DatastoreClass table)

Accessor whether the supplied DatastoreClass is a supertable of this table.

Specified by:

isSuperDatastoreClass in interface DatastoreClass

Parameters:

table - The DatastoreClass to check

Returns:

Whether it is a supertable (somewhere up the inheritance tree)

getSecondaryDatastoreClasses

public Collection getSecondaryDatastoreClasses()

Accessor for any secondary tables for this table.

Specified by:

getSecondaryDatastoreClasses in interface DatastoreClass

Returns:

Secondary tables (if any)

getVersionMapping

public JavaTypeMapping getVersionMapping(boolean allowSuperclasses)

Accessor for the version mapping specified .

Overrides:

getVersionMapping in class AbstractClassTable

Parameters:

allowSuperclasses - Whether we should return just the mapping from this table or whether we should return it when this table has none and the supertable has

Returns:

The version mapping.

getDiscriminatorMapping

public JavaTypeMapping getDiscriminatorMapping(boolean allowSuperclasses)

Accessor for the discriminator mapping specified .

Overrides:

getDiscriminatorMapping in class AbstractClassTable

Parameters:

allowSuperclasses - Whether we should return just the mapping from this table or whether we should return it when this table has none and the supertable has

Returns:

The discriminator mapping.

getTableManagingMapping

public ClassTable getTableManagingMapping(JavaTypeMapping mapping)

getBaseDatastoreClassWithMember

public DatastoreClass getBaseDatastoreClassWithMember(org.datanucleus.metadata.AbstractMemberMetaData mmd)

Convenience accessor for the base table for this table which has the specified field.

Specified by:

getBaseDatastoreClassWithMember in interface DatastoreClass

Parameters:

mmd - Field MetaData for this field

Returns:

The base table which has the field specified

getClassMetaData

public org.datanucleus.metadata.ClassMetaData getClassMetaData()

Accessor for the (primary) class MetaData. Package-level access to restrict to other table types only.

Specified by:

getClassMetaData in interface org.datanucleus.store.schema.table.Table

Overrides:

getClassMetaData in class AbstractTable

Returns:

The (primary) class MetaData

getExpectedIndices

protected Set getExpectedIndices(org.datanucleus.ClassLoaderResolver clr)

Accessor for the indices for this table. This includes both the user-defined indices (via MetaData), and the ones required by foreign keys (required by relationships).

Overrides:

getExpectedIndices in class TableImpl

Parameters:

clr - The ClassLoaderResolver

Returns:

The indices

getExpectedForeignKeys

public List getExpectedForeignKeys(org.datanucleus.ClassLoaderResolver clr)

Accessor for the expected foreign keys for this table.

Overrides:

getExpectedForeignKeys in class TableImpl

Parameters:

clr - The ClassLoaderResolver

Returns:

The expected foreign keys.

getExpectedCandidateKeys

protected List getExpectedCandidateKeys()

Accessor for the expected candidate keys for this table.

Overrides:

getExpectedCandidateKeys in class TableImpl

Returns:

The expected candidate keys.

getPrimaryKey

public PrimaryKey getPrimaryKey()

Accessor for the primary key for this table. Overrides the method in TableImpl to add on any specification of PK name in the metadata.

Overrides:

getPrimaryKey in class TableImpl

Returns:

The primary key.

getSQLCreateStatements

protected List getSQLCreateStatements(Properties props)

Accessor for the CREATE statements for this table. Creates this table followed by all secondary tables (if any).

Overrides:

getSQLCreateStatements in class TableImpl

Parameters:

props - Properties for creating the table

Returns:

the SQL statements to be executed for creation

getSQLDropStatements

protected List getSQLDropStatements()

Accessor for the DROP statements for this table. Drops all secondary tables (if any) followed by the table itself.

Overrides:

getSQLDropStatements in class TableImpl

Returns:

List of statements

getIdMapping

public JavaTypeMapping getIdMapping()

Accessor for a mapping for the ID (persistable) for this table.

Returns:

The (persistable) ID mapping.

hasExternalFkMappings

public boolean hasExternalFkMappings()

getExternalMapping

public JavaTypeMapping getExternalMapping(org.datanucleus.metadata.AbstractMemberMetaData mmd,
                                          int mappingType)

Accessor for an external mapping for the specified field of the required type.

Specified by:

getExternalMapping in interface DatastoreClass

Parameters:

mmd - MetaData for the field/property

mappingType - Type of mapping

Returns:

The (external) mapping

getMetaDataForExternalMapping

public org.datanucleus.metadata.AbstractMemberMetaData getMetaDataForExternalMapping(JavaTypeMapping mapping,
                                                                                     int mappingType)

Accessor for the MetaData for the (owner) field that an external mapping corresponds to.

Specified by:

getMetaDataForExternalMapping in interface DatastoreClass

Parameters:

mapping - The mapping

mappingType - The mapping type

Returns:

metadata for the external mapping

getMemberMapping

public JavaTypeMapping getMemberMapping(org.datanucleus.metadata.AbstractMemberMetaData mmd)

Accessor for the field mapping for the specified field. The field can be managed by a supertable of this table.

Specified by:

getMemberMapping in interface DatastoreClass

Parameters:

mmd - MetaData for this field/property

Returns:

the Mapping for the field/property

getMemberMappingInDatastoreClass

public JavaTypeMapping getMemberMappingInDatastoreClass(org.datanucleus.metadata.AbstractMemberMetaData mmd)

Accessor for the mapping for the specified field only in this datastore class.

Specified by:

getMemberMappingInDatastoreClass in interface DatastoreClass

Parameters:

mmd - Metadata of the field/property

Returns:

The Mapping for the field/property (or null if not present here)

getMemberMapping

public JavaTypeMapping getMemberMapping(String memberName)

Accessor for the field mapping for the named field. The field may exist in a parent table or a secondary table. Throws a NoSuchPersistentFieldException if the field name is not found. TODO Use of this is discouraged since the fieldName is not fully qualified and if a superclass-table inheritance is used we could have 2 fields of that name here.

Specified by:

getMemberMapping in interface DatastoreClass

Parameters:

memberName - Name of field/property

Returns:

The mapping.

Throws:

NoSuchPersistentFieldException - Thrown when the field/property is not found

providePrimaryKeyMappings

public void providePrimaryKeyMappings(MappingConsumer consumer)

Provide the mappings to the consumer for all primary-key fields mapped to this table.

Specified by:

providePrimaryKeyMappings in interface DatastoreClass

Specified by:

providePrimaryKeyMappings in class AbstractClassTable

Parameters:

consumer - Consumer for the mappings

provideExternalMappings

public final void provideExternalMappings(MappingConsumer consumer,
                                          int mappingType)

Provide the mappings to the consumer for all external fields mapped to this table of the specified type

Specified by:

provideExternalMappings in interface DatastoreClass

Parameters:

consumer - Consumer for the mappings

mappingType - Type of external mapping

provideMappingsForMembers

public void provideMappingsForMembers(MappingConsumer consumer,
                                      org.datanucleus.metadata.AbstractMemberMetaData[] fieldMetaData,
                                      boolean includeSecondaryTables)

Provide the mappings to the consumer for all absolute field Numbers in this table that are container in the fieldNumbers parameter.

Specified by:

provideMappingsForMembers in interface DatastoreClass

Overrides:

provideMappingsForMembers in class AbstractClassTable

Parameters:

consumer - Consumer for the mappings

fieldMetaData - MetaData for the fields to provide mappings for

includeSecondaryTables - Whether to provide fields in secondary tables

provideUnmappedColumns

public void provideUnmappedColumns(MappingConsumer consumer)

Method to provide all unmapped columns to the consumer.

Specified by:

provideUnmappedColumns in interface DatastoreClass

Parameters:

consumer - Consumer of information

validateConstraints

public boolean validateConstraints(Connection conn,
                                   boolean autoCreate,
                                   Collection autoCreateErrors,
                                   org.datanucleus.ClassLoaderResolver clr)
                            throws SQLException

Method to validate the constraints of this table.

Overrides:

validateConstraints in class TableImpl

Parameters:

conn - Connection to use in validation

autoCreate - Whether to auto create the constraints

autoCreateErrors - Whether to log a warning only on errors during "auto create"

clr - The ClassLoaderResolver

Returns:

Whether the DB was modified

Throws:

SQLException - Thrown when an error occurs in validation