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;

 import liquibase.precondition.PreconditionLogic;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * Class for controling "or" logic in preconditions.

  */

 public class OrPrecondition extends PreconditionLogic {

     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 {

         boolean onePassed = false;

         List<FailedPrecondition> failures = new ArrayList<FailedPrecondition>();

         for (Precondition precondition : getNestedPreconditions()) {

             try {

                 precondition.check(database, changeLog, changeSet);

                 onePassed = true;

                 break;

             } catch (PreconditionFailedException e) {

                 failures.addAll(e.getFailedPreconditions());

             }

         }

         if (!onePassed) {

             throw new PreconditionFailedException(failures);

         }

     }

     public String getName() {

         return "or";

     }

 }