package liquibase.change.custom;

 import liquibase.database.Database;

 import liquibase.exception.CustomChangeException;

 import liquibase.exception.RollbackImpossibleException;

 import liquibase.exception.UnsupportedChangeException;

 import liquibase.statement.SqlStatement;

 /**

  * Interface to implement that allows rollback of a custom sql change.

  * 

  * @see liquibase.change.custom.CustomSqlChange

  */

 public interface CustomSqlRollback {

     /**

      * Generates the SQL statements required to roll back the change

      * 

      * @param database

      *            the target {@link liquibase.database.Database} associated to this change's rollback statements

      * @return an array of {@link SqlStatement}s with the rollback statements

      * @throws liquibase.exception.CustomChangeException

      *             if an exception occurs while processing this rollback

      * @throws liquibase.exception.UnsupportedChangeException

      *             if this change is not supported by the {@link liquibase.database.Database} passed as argument

      * @throws liquibase.exception.RollbackImpossibleException

      *             if rollback is not supported for this change

      */

     public SqlStatement[] generateRollbackStatements(Database database) throws CustomChangeException,

             UnsupportedChangeException, RollbackImpossibleException;

 }