/* * Generates rollback statements from the inverse changes returned by createInverses(). * Throws RollbackImpossibleException if the changes created by createInverses() is not supported for the passed database. * */ private SqlStatement[] generateRollbackStatementsFromInverse(Database database) throws RollbackImpossibleException { Change[] inverses = createInverses(); if (inverses == null) { throw new RollbackImpossibleException("No inverse to " + getClass().getName() + " created"); } List<SqlStatement> statements = new ArrayList<SqlStatement>(); try { for (Change inverse : inverses) { if (!inverse.supports(database)) { throw new RollbackImpossibleException( ChangeFactory.getInstance().getChangeMetaData(inverse).getName() + " is not supported on " + database.getShortName()); } statements.addAll(Arrays.asList(inverse.generateStatements(database))); } } catch (LiquibaseException e) { throw new RollbackImpossibleException(e); } return statements.toArray(new SqlStatement[statements.size()]); }