package liquibase.precondition.core;

 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;

 import liquibase.precondition.Precondition;

 /**

  * Precondition for specifying the type of database (oracle, mysql, etc.).

  */

 public class DBMSPrecondition implements Precondition {

     private String type;

     public DBMSPrecondition() {

     }

     public String getType() {

         return type;

     }

     public void setType(String atype) {

         this.type = atype.toLowerCase();

     }

     public Warnings warn(Database database) {

         return new Warnings();

     }

     public ValidationErrors validate(Database database) {

         return new ValidationErrors();

     }

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

             throws PreconditionFailedException, PreconditionErrorException {

         try {

             String dbType = database.getTypeName();

             if (!type.equals(dbType)) {

                 throw new PreconditionFailedException("DBMS Precondition failed: expected " + type + ", got " + dbType,

                         changeLog, this);

             }

         } catch (PreconditionFailedException e) {

             throw e;

         } catch (Exception e) {

             throw new PreconditionErrorException(e, changeLog, this);

         }

     }

     public String getName() {

         return "dbms";

     }

 }