/*
* 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()]);
}