package liquibase.precondition;

 import liquibase.changelog.DatabaseChangeLog;

 import liquibase.changelog.ChangeSet;

 import liquibase.database.Database;

 import liquibase.exception.PreconditionErrorException;

 import liquibase.exception.PreconditionFailedException;

 import liquibase.exception.ValidationErrors;

 import liquibase.exception.Warnings;

 /**

  * Marker interface for preconditions. May become an annotation in the future.

  */

 public interface Precondition {

     public String getName();

     public Warnings warn(Database database);

     public ValidationErrors validate(Database database);

     public void check(Database database, DatabaseChangeLog changeLog, ChangeSet changeSet)

             throws PreconditionFailedException, PreconditionErrorException;

 }