org.datanucleus.store.rdbms.identifier

Class DN2IdentifierFactory

java.lang.Object

org.datanucleus.store.rdbms.identifier.AbstractIdentifierFactory

org.datanucleus.store.rdbms.identifier.DNIdentifierFactory

org.datanucleus.store.rdbms.identifier.DN2IdentifierFactory

All Implemented Interfaces:

IdentifierFactory

public class DN2IdentifierFactory
extends DNIdentifierFactory

Factory that creates immutable instances of DatastoreIdentifier for mapped datastores. Provides a more concise and consistent alternative to "jpox". Naming as follows:-

• Class called "MyClass" will generate table name of "MYCLASS"
• Field called "myField" will generate column name of "MYFIELD"
• 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 "IDX"
• Version field columns will, by default, be called "VERSION"
• Adapter index field columns will, by default, be called "IDX"

Field Summary

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

tablePrefix, tableSuffix

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
DN2IdentifierFactory(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.
DatastoreIdentifier	newAdapterIndexFieldIdentifier() Method to return an identifier for an adapter index datastore field.
DatastoreIdentifier	newForeignKeyFieldIdentifier(org.datanucleus.metadata.AbstractMemberMetaData ownerFmd, 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	newVersionFieldIdentifier() Method to return an identifier for a version datastore field.

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

getColumnIdentifierSuffix, newDiscriminatorFieldIdentifier, newForeignKeyFieldIdentifier, newReferenceFieldIdentifier, newTableIdentifier, newTableIdentifier

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

DN2IdentifierFactory

public DN2IdentifierFactory(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)
• 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

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.

Specified by:

newJoinTableFieldIdentifier in interface IdentifierFactory

Overrides:

newJoinTableFieldIdentifier in class DNIdentifierFactory

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(org.datanucleus.metadata.AbstractMemberMetaData ownerFmd,
                                               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

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

newVersionFieldIdentifier

public DatastoreIdentifier newVersionFieldIdentifier()

Method to return an identifier for a version datastore field.

Specified by:

newVersionFieldIdentifier in interface IdentifierFactory

Overrides:

newVersionFieldIdentifier in class DNIdentifierFactory

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.

Specified by:

newIndexFieldIdentifier in interface IdentifierFactory

Overrides:

newIndexFieldIdentifier in class DNIdentifierFactory

Parameters:

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

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.

Specified by:

newAdapterIndexFieldIdentifier in interface IdentifierFactory

Overrides:

newAdapterIndexFieldIdentifier in class DNIdentifierFactory

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.

Overrides:

generateIdentifierNameForJavaName in class DNIdentifierFactory

Parameters:

javaName - the Java identifier.

Returns:

The datastore identifier