org.datanucleus.store.mapped.identifier
Class DNIdentifierFactory

java.lang.Object
  org.datanucleus.store.mapped.identifier.AbstractIdentifierFactory
      org.datanucleus.store.mapped.identifier.DNIdentifierFactory

All Implemented Interfaces:

IdentifierFactory

Direct Known Subclasses:

DN2IdentifierFactory, JPOXIdentifierFactory

public class DNIdentifierFactory
extends AbstractIdentifierFactory

Factory that creates immutable instances of DatastoreIdentifier for mapped datastores. Includes a "JPOX" naming strategy, naming as follows

• Class called "MyClass" will generate table name of "MYCLASS"
• Field called "myField" will generate column name of "MY_FIELD"
• Datastore id field for class "MyClass" will have the PK field "MYCLASS_ID"
• Join table will be named after the class and field, so "MyClass" with field "myField" will become a table with name "MYCLASS_MYFIELD".
• Columns of a join table will be named after the PK fields of the owner and element. So something like "MYCLASS_ID_OID" and "MYELEMENT_ID_EID"
• Discriminator field columns will, by default, be called "DISCRIMINATOR"
• Index field columns will, by default, be called "INTEGER_IDX"
• Version field columns will, by default, be called "OPT_VERSION"
• Adapter index field columns will, by default, be called "ADPT_PK_IDX"

Strictly speaking the naming of the table is inconsistent with the naming of the column since the table doesn't use the word separator whereas the column does, but JPOX 1.0/1.1/1.2 were like this so provided for compatibility.

Field Summary

protected String	tablePrefix Prefix for all generated table names.
protected String	tableSuffix Suffix for all generated table names.

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

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

Constructor Summary

DNIdentifierFactory(DatastoreAdapter dba, ClassLoaderResolver clr, Map props)
Constructor.

Method Summary

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	newDatastoreContainerIdentifier(AbstractClassMetaData cmd) Method to return a Table identifier for the specified class.
DatastoreIdentifier	newDatastoreContainerIdentifier(AbstractMemberMetaData fmd) Method to return a Table identifier for the join table of the specified field.
DatastoreIdentifier	newDiscriminatorFieldIdentifier() Method to return an identifier for a discriminator column.
DatastoreIdentifier	newForeignKeyFieldIdentifier(AbstractMemberMetaData ownerFmd, AbstractMemberMetaData relatedFmd, DatastoreIdentifier destinationId, boolean embedded, int fieldRole) Method to generate a FK/FK-index field identifier.
DatastoreIdentifier	newIndexFieldIdentifier(AbstractMemberMetaData mmd) Method to return an identifier for an index (ordering) datastore field.
DatastoreIdentifier	newJoinTableFieldIdentifier(AbstractMemberMetaData ownerFmd, AbstractMemberMetaData relatedFmd, DatastoreIdentifier destinationId, boolean embedded, int fieldRole) Method to generate a join-table identifier.
DatastoreIdentifier	newReferenceFieldIdentifier(AbstractMemberMetaData refMetaData, 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	newVersionFieldIdentifier() Method to return an identifier for a version datastore field.

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

getDatastoreAdapter, getIdentifierCase, getIdentifierInAdapterCase, getIdentifierNamePartsFromName, getWordSeparator, newCandidateKeyIdentifier, newDatastoreContainerIdentifier, newDatastoreFieldIdentifier, newDatastoreFieldIdentifier, newForeignKeyIdentifier, newIdentifier, newIdentifier, newIndexIdentifier, newPrimaryKeyIdentifier, newSequenceIdentifier, setCatalogSchemaForTable, truncate

Methods inherited from class java.lang.Object

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

Field Detail

tablePrefix

protected String tablePrefix

Prefix for all generated table names.

tableSuffix

protected String tableSuffix

Suffix for all generated table names.

Constructor Detail

DNIdentifierFactory

public DNIdentifierFactory(DatastoreAdapter dba,
                           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)
• WordSeparator : separator character(s) between identifier words
• TablePrefix : Prefix to prepend to all table identifiers
• TableSuffix : Suffix to append to all table identifiers

Parameters:

dba - Database adapter

clr - ClassLoader resolver

props - Any properties controlling identifier generation

Method Detail

newDatastoreContainerIdentifier

public DatastoreIdentifier newDatastoreContainerIdentifier(AbstractMemberMetaData fmd)

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

Parameters:

fmd - Meta data for the field

Returns:

The identifier for the table

newDatastoreContainerIdentifier

public DatastoreIdentifier newDatastoreContainerIdentifier(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(AbstractMemberMetaData refMetaData,
                                                       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(AbstractMemberMetaData ownerFmd,
                                                       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

relatedFmd - MetaData for the related 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 ?

Returns:

The identifier.

newForeignKeyFieldIdentifier

public DatastoreIdentifier newForeignKeyFieldIdentifier(AbstractMemberMetaData ownerFmd,
                                                        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 owner, index ?

Returns:

The identifier

newDiscriminatorFieldIdentifier

public DatastoreIdentifier newDiscriminatorFieldIdentifier()

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

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

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

newIndexFieldIdentifier

public DatastoreIdentifier newIndexFieldIdentifier(AbstractMemberMetaData mmd)

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

Parameters:

mmd - MetaData for the field/property - not used here

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 a word separator. 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 DatastoreField is stored embedded

Returns:

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