org.apache.cayenne

## Class PersistenceState

- java.lang.Object
- - org.apache.cayenne.PersistenceState

-     public class PersistenceState
      extends Object

  Defines a set of object states from the point of view of persistence. I.e. PersistenceState is the state of data stored in an object relative to the external persistence store. If an object's state matches the state of the persistence store, the object is COMMITTED. If object is not intended to be persistent or is not explicitly made persistent, the state is TRANSIENT, and so on.

  Object persistence states should not be modified directly. Rather it is a responsibility of a ObjectContext/DataContext to maintain correct state of the managed objects.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `COMMITTED` Describes a state of an object registered with DataContext/ObjectContext, whose fields exactly match the state of a corresponding database row.
    `static int` | `DELETED` Describes a state of an object registered with DataContext/ObjectContext, that will be deleted from the database on the next commit.
    `static int` | `HOLLOW` Describes a state of an object registered with DataContext/ObjectContext, and having a corresponding database row.
    `static int` | `MODIFIED` Describes a state of an object registered with DataContext/ObjectContext, and having a corresponding database row.
    `static int` | `NEW` Describes a state of an object freshly registered with DataContext/ObjectContext, but not committed to the database yet.
    `static int` | `TRANSIENT` Describes a state of an object not registered with DataContext/ObjectContext, and therefore having no persistence features.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `PersistenceState()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static String` | `persistenceStateName(int persistenceState)` Returns String label for persistence state.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### TRANSIENT

          public static final int TRANSIENT

      Describes a state of an object not registered with DataContext/ObjectContext, and therefore having no persistence features.
      See Also:
        Constant Field Values

    - #### NEW

          public static final int NEW

      Describes a state of an object freshly registered with DataContext/ObjectContext, but not committed to the database yet. So there is no corresponding database record for this object just yet.
      See Also:
        Constant Field Values

    - #### COMMITTED

          public static final int COMMITTED

      Describes a state of an object registered with DataContext/ObjectContext, whose fields exactly match the state of a corresponding database row. This state is not fully "clean", since database record may have been externally modified.
      See Also:
        Constant Field Values

    - #### MODIFIED

          public static final int MODIFIED

      Describes a state of an object registered with DataContext/ObjectContext, and having a corresponding database row. This object state is known to be locally modified and different from the database state.
      See Also:
        Constant Field Values

    - #### HOLLOW

          public static final int HOLLOW

      Describes a state of an object registered with DataContext/ObjectContext, and having a corresponding database row. This object does not store any fields except for its id (it is "hollow"), so next time it is accessed, it will be populated from the database by the context. In this respect this is a real "clean" object.
      See Also:
        Constant Field Values

    - #### DELETED

          public static final int DELETED

      Describes a state of an object registered with DataContext/ObjectContext, that will be deleted from the database on the next commit.
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### PersistenceState

          public PersistenceState()

  - ### Method Detail

    - #### persistenceStateName

          public static String persistenceStateName(int persistenceState)

      Returns String label for persistence state. Used for debugging.

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