Module org.tentackle.model

Package org.tentackle.model.migrate

Class IndexMigrator

java.lang.Object

org.tentackle.model.migrate.IndexMigrator

public class IndexMigrator
extends Object

Handles the migration of indexes.

Author:

harald

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	IndexMigrator.Result	Migration result.

Constructor Summary

Constructors

Constructor	Description
IndexMigrator(Entity entity, Index index, Backend backend, IndexMetaData indexMetaData)	Creates a migrator.

Method Summary

Modifier and Type	Method	Description
Backend	getBackend()	Gets the backend.
Index	getIndex()	Gets the index to migrate.
IndexMetaData	getIndexMetaData()	Gets the index metadata.
static boolean	isLogicallyDifferent(Index modelIndex, IndexMetaData dbIndex, StringBuilder commentBuf)	Compares an model index with an existing database index.
IndexMigrator.Result	migrate()	Migrates the index.

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexMigrator

public IndexMigrator(Entity entity,
                     Index index,
                     Backend backend,
                     IndexMetaData indexMetaData)

Creates a migrator.

Parameters:

entity - the entity

index - the index to migrate, null if no such index in model

backend - the backend

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

Method Detail

getBackend

public Backend getBackend()

Gets the backend.

Returns:

the backend

getIndex

public Index getIndex()

Gets the index to migrate.

Returns:

the index, null if no such index in model

getIndexMetaData

public IndexMetaData getIndexMetaData()

Gets the index metadata.

Returns:

the meta date, null if no such index in database

migrate

public IndexMigrator.Result migrate()

Migrates the index.

Returns:

the SQL code, empty string if nothing to migrate

isLogicallyDifferent

public static boolean isLogicallyDifferent(Index modelIndex,
                                           IndexMetaData dbIndex,
                                           StringBuilder commentBuf)

Compares an model index with an existing database index.

Parameters:

modelIndex - the index as defined in the model

dbIndex - the index existing in the database

commentBuf - comment buffer to show the difference, null if none

Returns:

true if they are different, false if logically equal