org.tentackle.model.migrate

Class ForeignKeyMigrator

java.lang.Object

org.tentackle.model.migrate.ForeignKeyMigrator

public class ForeignKeyMigrator
extends Object

Handles the migration of foreign keys.

Author:

harald

Constructor Summary

Constructors

Constructor and Description
ForeignKeyMigrator(Backend backend, ForeignKey foreignKey, ForeignKeyMetaData foreignKeyMetaData) Creates a migrator.

Method Summary

Modifier and Type	Method and Description
Backend	getBackend() Gets the backend.
ForeignKey	getForeignKey() Gets the foreign key to migrate.
ForeignKeyMetaData	getForeignKeyMetaData() Gets the foreign key metadata.
String	migrate() Migrates the foreign key.

Methods inherited from class java.lang.Object

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

Constructor Detail

ForeignKeyMigrator

public ForeignKeyMigrator(Backend backend,
                          ForeignKey foreignKey,
                          ForeignKeyMetaData foreignKeyMetaData)

Creates a migrator.

Parameters:

backend - the backend

foreignKey - the foreign key to migrate, null if no such fk in model

foreignKeyMetaData - the foreign key meta data, null if key does not exist

Method Detail

getBackend

public Backend getBackend()

Gets the backend.

Returns:

the backend

getForeignKey

public ForeignKey getForeignKey()

Gets the foreign key to migrate.

Returns:

the foreign key, null if no such fk in model

getForeignKeyMetaData

public ForeignKeyMetaData getForeignKeyMetaData()

Gets the foreign key metadata.

Returns:

the meta date, null if no such fk in database

migrate

public String migrate()
               throws ModelException

Migrates the foreign key.

Returns:

the SQL code, empty string if nothing to migrate

Throws:

ModelException - if migration failed