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ESQL, SQL enhanced with metadata compiling to various relational databases
package ma.vi.esql.parser;
import ma.vi.esql.database.Database;
/**
*
* An ESQL transformer can transform an ESQL statement into a different ESQL
* statement. They are registered with the system and are invoked in the order
* of registration before an ESQL statement is executed.
*
*
*
* They are invoked after parameter substitution and macro expansion of the ESQL
* statement and can be viewed as external macro expansion system. After all
* transformers have been run, the final ESQL returned is translated and executed
* on the database.
*
*
*
* Transformers can be used to implement logic for access control, auditing,
* optimization, etc.
*
*
* @author Vikash Madhow ([email protected])
*/
public interface EsqlTransformer {
Esql transform(Database db, Esql esql);
}