package liquibase.sqlgenerator.core;

 import liquibase.database.Database;

 import liquibase.database.core.H2Database;

 import liquibase.database.core.HsqlDatabase;

 import liquibase.exception.DatabaseException;

 import liquibase.exception.UnexpectedLiquibaseException;

 import liquibase.exception.ValidationErrors;

 import liquibase.sql.Sql;

 import liquibase.sql.UnparsedSql;

 import liquibase.sqlgenerator.SqlGenerator;

 import liquibase.sqlgenerator.SqlGeneratorChain;

 import liquibase.statement.core.SelectSequencesStatement;

 public class SelectSequencesGeneratorHsql extends AbstractSqlGenerator<SelectSequencesStatement> {

     @Override

     public int getPriority() {

         return PRIORITY_DATABASE;

     }

     @Override

     public boolean supports(SelectSequencesStatement statement, Database database) {

         return database instanceof HsqlDatabase;

     }

     public ValidationErrors validate(SelectSequencesStatement statement, Database database,

             SqlGeneratorChain sqlGeneratorChain) {

         return new ValidationErrors();

     }

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

         try {

             return new Sql[] { new UnparsedSql(

                     "SELECT SEQUENCE_NAME FROM INFORMATION_SCHEMA.SYSTEM_SEQUENCES WHERE SEQUENCE_SCHEMA = '"

                             + database.convertRequestedSchemaToSchema(statement.getSchemaName()) + "'") };

         } catch (DatabaseException e) {

             throw new UnexpectedLiquibaseException(e);

         }

     }

 }