org.datanucleus.store.rdbms.identifier

Class JPAIdentifierFactory

java.lang.Object

org.datanucleus.store.rdbms.identifier.AbstractIdentifierFactory

org.datanucleus.store.rdbms.identifier.JPAIdentifierFactory

All Implemented Interfaces:

IdentifierFactory

public class JPAIdentifierFactory
extends AbstractIdentifierFactory

Factory that creates immutable instances of DatastoreIdentifier for mapped datastores with JPA. Includes the JPA naming strategy, naming as follows

• Class called "MyClass" will generate table name of "MYCLASS"
• Field called "myField" will generate column name of "MYFIELD"
• Join table will be named after the ownerClass and the otherClass so "MyClass" joining to "MyOtherClass" will have a join table called "MYCLASS_MYOTHERCLASS"
• Datastore-identity column for class "MyClass" will be "MYCLASS_ID" (not part of JPA)
• 1-N uni between "MyClass" (field="myField") and "MyElement" will have FK in "MYELEMENT" of MYFIELD_MYCLASS_ID
• 1-N bi between "MyClass" (field="myField") and "MyElement" (field="myClassRef") will have FK in "MYELEMENT" of name "MYCLASSREF_MYCLASS_ID".
• 1-1 uni between "MyClass" (field="myField") and "MyElement" will have FK in "MYCLASS" of name "MYFIELD_MYELEMENT_ID"
• Discriminator field columns will, by default, be called "DTYPE"
• Version field columns will, by default, be called "VERSION"
• Index (ordering) field columns will, for field "myField", be called "MYFIELD_ORDER"
• Adapter index field columns will, by default, be called "IDX"

Field Summary

Fields inherited from class org.datanucleus.store.rdbms.identifier.AbstractIdentifierFactory

candidates, CASE_LOWER, CASE_PRESERVE, CASE_UPPER, clr, columns, dba, defaultCatalogName, defaultSchemaName, foreignkeys, identifierCase, indexes, LOCALISER, namingFactory, primarykeys, quoteString, references, sequences, tables, wordSeparator

Constructor Summary

Constructors

Constructor and Description
JPAIdentifierFactory(DatastoreAdapter dba, org.datanucleus.ClassLoaderResolver clr, Map props) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
String	generateIdentifierNameForJavaName(String javaName) Generate a datastore identifier from a Java identifier.
protected String	getColumnIdentifierSuffix(int role, boolean embedded) Accessor for the suffix to add to any column identifier, based on the role type.
DatastoreIdentifier	newAdapterIndexFieldIdentifier() Method to return an identifier for an adapter index datastore field.
DatastoreIdentifier	newDiscriminatorFieldIdentifier() Method to return an identifier for a discriminator column.
DatastoreIdentifier	newForeignKeyFieldIdentifier(org.datanucleus.metadata.AbstractMemberMetaData ownerFmd, org.datanucleus.metadata.AbstractMemberMetaData relatedFmd, DatastoreIdentifier destinationId, boolean embedded, int fieldRole) Method to generate a FK/FK-index field identifier.
DatastoreIdentifier	newIndexFieldIdentifier(org.datanucleus.metadata.AbstractMemberMetaData mmd) Method to return an identifier for an index (ordering) datastore field.
DatastoreIdentifier	newJoinTableFieldIdentifier(org.datanucleus.metadata.AbstractMemberMetaData ownerFmd, org.datanucleus.metadata.AbstractMemberMetaData relatedFmd, DatastoreIdentifier destinationId, boolean embedded, int fieldRole) Method to generate a join-table identifier.
DatastoreIdentifier	newReferenceFieldIdentifier(org.datanucleus.metadata.AbstractMemberMetaData refMetaData, org.datanucleus.metadata.AbstractClassMetaData implMetaData, DatastoreIdentifier implIdentifier, boolean embedded, int fieldRole) Method to generate an identifier name for reference field, based on the metadata for the field, and the ClassMetaData for the implementation.
DatastoreIdentifier	newTableIdentifier(org.datanucleus.metadata.AbstractClassMetaData cmd) Method to return a Table identifier for the specified class.
DatastoreIdentifier	newTableIdentifier(org.datanucleus.metadata.AbstractMemberMetaData mmd) Method to return a Table identifier for the join table of the specified field/property.
DatastoreIdentifier	newVersionFieldIdentifier() Method to return an identifier for a version datastore field.

Methods inherited from class org.datanucleus.store.rdbms.identifier.AbstractIdentifierFactory

getDatastoreAdapter, getIdentifierCase, getIdentifierInAdapterCase, getIdentifierNamePartsFromName, getWordSeparator, newCandidateKeyIdentifier, newColumnIdentifier, newColumnIdentifier, newForeignKeyIdentifier, newIdentifier, newIdentifier, newIndexIdentifier, newPrimaryKeyIdentifier, newSequenceIdentifier, newTableIdentifier, setCatalogSchemaForTable, truncate

Methods inherited from class java.lang.Object

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

Constructor Detail

JPAIdentifierFactory

public JPAIdentifierFactory(DatastoreAdapter dba,
                    org.datanucleus.ClassLoaderResolver clr,
                    Map props)

Constructor. The properties accepted are

• RequiredCase : what case the identifiers should be in
• DefaultCatalog : default catalog to use (if any)
• DefaultSchema : default schema to use (if any)

Parameters:

dba - Datastore adapter

clr - ClassLoader resolver

props - Any properties controlling identifier generation

Method Detail

newTableIdentifier

public DatastoreIdentifier newTableIdentifier(org.datanucleus.metadata.AbstractMemberMetaData mmd)

Method to return a Table identifier for the join table of the specified field/property.

Parameters:

mmd - Meta data for the field/property

Returns:

The identifier for the table

newTableIdentifier

public DatastoreIdentifier newTableIdentifier(org.datanucleus.metadata.AbstractClassMetaData cmd)

Method to return a Table identifier for the specified class.

Parameters:

cmd - Meta data for the class

Returns:

The identifier for the table

newReferenceFieldIdentifier

public DatastoreIdentifier newReferenceFieldIdentifier(org.datanucleus.metadata.AbstractMemberMetaData refMetaData,
                                              org.datanucleus.metadata.AbstractClassMetaData implMetaData,
                                              DatastoreIdentifier implIdentifier,
                                              boolean embedded,
                                              int fieldRole)

Method to generate an identifier name for reference field, based on the metadata for the field, and the ClassMetaData for the implementation.

Parameters:

refMetaData - the metadata for the reference field

implMetaData - the AbstractClassMetaData for this implementation

implIdentifier - PK identifier for the implementation

embedded - Whether the identifier is for a field embedded

fieldRole - The role to be performed by this column e.g FK, collection element ?

Returns:

The DatastoreIdentifier

newJoinTableFieldIdentifier

public DatastoreIdentifier newJoinTableFieldIdentifier(org.datanucleus.metadata.AbstractMemberMetaData ownerFmd,
                                              org.datanucleus.metadata.AbstractMemberMetaData relatedFmd,
                                              DatastoreIdentifier destinationId,
                                              boolean embedded,
                                              int fieldRole)

Method to generate a join-table identifier. The identifier could be for a foreign-key to another table (if the destinationId is provided), or could be for a simple column in the join table.

Parameters:

ownerFmd - MetaData for the owner field

destinationId - Identifier for the identity field of the destination (if FK)

embedded - Whether the identifier is for a field embedded

fieldRole - The role to be performed by this column e.g FK, collection element ?

relatedFmd - MetaData for the related field (if bidirectional)

Returns:

The identifier.

newForeignKeyFieldIdentifier

public DatastoreIdentifier newForeignKeyFieldIdentifier(org.datanucleus.metadata.AbstractMemberMetaData ownerFmd,
                                               org.datanucleus.metadata.AbstractMemberMetaData relatedFmd,
                                               DatastoreIdentifier destinationId,
                                               boolean embedded,
                                               int fieldRole)

Method to generate a FK/FK-index field identifier. The identifier could be for the FK field itself, or for a related index for the FK.

Parameters:

ownerFmd - MetaData for the owner field

relatedFmd - MetaData for the related field

destinationId - Identifier for the identity field of the destination table (if strict FK)

embedded - Whether the identifier is for a field embedded

fieldRole - The role to be performed by this column e.g ROLE_OWNER, ROLE_INDEX

Returns:

The identifier

newDiscriminatorFieldIdentifier

public DatastoreIdentifier newDiscriminatorFieldIdentifier()

Method to return an identifier for a discriminator column. Returns an identifier "DTYPE"

Returns:

The discriminator column identifier

newVersionFieldIdentifier

public DatastoreIdentifier newVersionFieldIdentifier()

Method to return an identifier for a version datastore field.

Returns:

The version datastore field identifier

newIndexFieldIdentifier

public DatastoreIdentifier newIndexFieldIdentifier(org.datanucleus.metadata.AbstractMemberMetaData mmd)

Method to return an identifier for an index (ordering) datastore field.

Parameters:

mmd - MetaData for the field/property

Returns:

The index datastore field identifier

newAdapterIndexFieldIdentifier

public DatastoreIdentifier newAdapterIndexFieldIdentifier()

Method to return an identifier for an adapter index datastore field. An "adapter index" is a column added to be part of a primary key when some other column cant perform that role.

Returns:

The index datastore field identifier

generateIdentifierNameForJavaName

public String generateIdentifierNameForJavaName(String javaName)

Generate a datastore identifier from a Java identifier.

Conversion consists of breaking the identifier into words, converting each word to upper-case, and separating each one with an underscore "_". Words are identified by a leading upper-case character. Any leading or trailing underscores are removed.

Specified by:

generateIdentifierNameForJavaName in class AbstractIdentifierFactory

Parameters:

javaName - the Java identifier.

Returns:

The datastore identifier

getColumnIdentifierSuffix

protected String getColumnIdentifierSuffix(int role,
                               boolean embedded)

Accessor for the suffix to add to any column identifier, based on the role type.

Specified by:

getColumnIdentifierSuffix in class AbstractIdentifierFactory

Parameters:

role - Datastore field role

embedded - Whether the column is stored embedded

Returns:

The suffix (e.g _ID for id columns).