package liquibase.sqlgenerator.core;

 import liquibase.database.Database;

 import liquibase.database.core.CacheDatabase;

 import liquibase.database.core.DB2Database;

 import liquibase.database.core.DerbyDatabase;

 import liquibase.database.core.FirebirdDatabase;

 import liquibase.database.core.H2Database;

 import liquibase.database.core.HsqlDatabase;

 import liquibase.database.core.InformixDatabase;

 import liquibase.database.core.MSSQLDatabase;

 import liquibase.database.core.MaxDBDatabase;

 import liquibase.database.core.MySQLDatabase;

 import liquibase.database.core.OracleDatabase;

 import liquibase.database.core.PostgresDatabase;

 import liquibase.database.core.SQLiteDatabase;

 import liquibase.database.core.SybaseASADatabase;

 import liquibase.exception.ValidationErrors;

 import liquibase.sql.Sql;

 import liquibase.sql.UnparsedSql;

 import liquibase.sqlgenerator.SqlGeneratorChain;

 import liquibase.statement.core.RenameTableStatement;

 public class RenameTableGenerator extends AbstractSqlGenerator<RenameTableStatement> {

     @Override

     public boolean supports(RenameTableStatement statement, Database database) {

         return !(database instanceof CacheDatabase || database instanceof FirebirdDatabase);

     }

     @Override

     public ValidationErrors validate(RenameTableStatement renameTableStatement, Database database,

             SqlGeneratorChain sqlGeneratorChain) {

         ValidationErrors validationErrors = new ValidationErrors();

         validationErrors.checkRequiredField("newTableName", renameTableStatement.getNewTableName());

         validationErrors.checkRequiredField("oldTableName", renameTableStatement.getOldTableName());

         return validationErrors;

     }

     @Override

     public Sql[] generateSql(RenameTableStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {

         String sql;

         if (database instanceof MSSQLDatabase) {

             sql = "exec sp_rename '" + database.escapeTableName(statement.getSchemaName(), statement.getOldTableName())

                     + "', '" + statement.getNewTableName() + '\'';

         } else if (database instanceof MySQLDatabase) {

             sql = "ALTER TABLE " + database.escapeTableName(statement.getSchemaName(), statement.getOldTableName())

                     + " RENAME " + database.escapeTableName(statement.getSchemaName(), statement.getNewTableName());

         } else if (database instanceof PostgresDatabase) {

             sql = "ALTER TABLE " + database.escapeTableName(statement.getSchemaName(), statement.getOldTableName())

                     + " RENAME TO " + database.escapeDatabaseObject(statement.getNewTableName());

         } else if (database instanceof SybaseASADatabase) {

             sql = "ALTER TABLE " + database.escapeTableName(statement.getSchemaName(), statement.getOldTableName())

                     + " RENAME " + database.escapeDatabaseObject(statement.getNewTableName());

         } else if ((database instanceof DerbyDatabase) || (database instanceof MaxDBDatabase)

                 || (database instanceof InformixDatabase)) {

             sql = "RENAME TABLE " + database.escapeTableName(statement.getSchemaName(), statement.getOldTableName())

                     + " TO " + database.escapeDatabaseObject(statement.getNewTableName());

         } else if (database instanceof HsqlDatabase || database instanceof H2Database) {

             sql = "ALTER TABLE " + database.escapeTableName(statement.getSchemaName(), statement.getOldTableName())

                     + " RENAME TO " + database.escapeDatabaseObject(statement.getNewTableName());

         } else if (database instanceof OracleDatabase) {

             sql = "ALTER TABLE " + database.escapeTableName(statement.getSchemaName(), statement.getOldTableName())

                     + " RENAME TO " + database.escapeDatabaseObject(statement.getNewTableName());

         } else if (database instanceof DB2Database) {

             sql = "RENAME " + database.escapeTableName(statement.getSchemaName(), statement.getOldTableName()) + " TO "

                     + database.escapeDatabaseObject(statement.getNewTableName()); // db2 doesn't allow specifying new

             // schema name

         } else if (database instanceof SQLiteDatabase) {

             sql = "ALTER TABLE " + database.escapeTableName(statement.getSchemaName(), statement.getOldTableName())

                     + " RENAME TO " + database.escapeDatabaseObject(statement.getNewTableName());

         } else {

             sql = "RENAME " + database.escapeTableName(statement.getSchemaName(), statement.getOldTableName()) + " TO "

                     + database.escapeTableName(statement.getSchemaName(), statement.getNewTableName());

         }

         return new Sql[] { new UnparsedSql(sql) }; // To change body of implemented methods use File | Settings | File

         // Templates.

     }

 }