Dr.NO/src/drno/server/database/persistence/StateNew.java

   1 /*
   2  * Created on 2005-04-02 This file is created 2005-04-02 and
   3  * descripes StateNew
   4  */
   5 package drno.server.database.persistence;
   6
   7 import drno.exception.ConsistanceException;
   8 import drno.exception.ObjectLockException;
   9 import drno.exception.UnkErrException;
  10 import drno.server.database.persistence.repository.MapperFacade;
  11 import drno.support.Logger;
  12
  13 /**
  14  * Represents the situation when an object is new and still
  15  * not committed to the database.
  16  * <p>
  17  * When its new, the only meaningfull operation will be to
  18  * commit the object to the database by using the commit
  19  * operation. all other operations are ignored.
  20  *
  21  * @author tobibobi
  22  */
  23 final class StateNew extends AbstractState {
  24     /** singleton instance */
  25     public final static AbstractState instance = new StateNew();
  26
  27     /**
  28      * Singleton constructor.
  29      * <p>
  30      * private forces use of instance.
  31      */
  32     private StateNew() {
  33     }
  34
  35     boolean canUnload()
  36     {
  37         // the object is actually not placed in any cache
  38         // yet.
  39         return false;
  40     }
  41
  42     /**
  43      * persists the object and changes state to
  44      * StateOldClean
  45      *
  46      * @throws UnkErrException
  47      */
  48
  49     void commit(LockObject lock, PersistentObject obj) throws ObjectLockException,
  50             ConsistanceException,
  51             UnkErrException
  52     {
  53         try {
  54             obj.verify();
  55             MapperFacade.instance().insert(obj);
  56             obj.setState(StateOldClean.instance);
  57         }
  58         catch (Exception e) {
  59             Logger.log(e);
  60         }
  61     }
  62
  63     LockObject delete(LockObject lock, PersistentObject obj)
  64     {
  65         obj.setState(StateDeleted.instance);
  66         return lock;
  67     }
  68 }