org.apache.cayenne

## Class HybridDataObject

- java.lang.Object
- - org.apache.cayenne.PersistentObject
  - - org.apache.cayenne.BaseDataObject
    - - org.apache.cayenne.HybridDataObject

- All Implemented Interfaces:
    Serializable, DataObject, Persistent, Validating

      public class HybridDataObject
      extends BaseDataObject

  This data object like `CayenneDataObject` uses `Map` to store generic attributes, only difference is that this Map will be created lazily at first write, thus reducing memory penalty if possible.

  This class can be used as superclass for objects that have attributes created at runtime. If generic runtime attributes will be used always it may be a good idea to use `CayenneDataObject` instead. If you don't create attributes at runtime it is better to use `BaseDataObject` class.

  Map creation is not thread safe, as DataObject in general not thread safe by it's own.

  Since:
    4.1
  See Also:
    `BaseDataObject`, `CayenneDataObject`, Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected Map<String,Object>` | `values`

    - ### Fields inherited from class org.apache.cayenne.BaseDataObject

      `snapshotVersion`

    - ### Fields inherited from class org.apache.cayenne.PersistentObject

      `objectContext, objectId, persistenceState`

    - ### Fields inherited from interface org.apache.cayenne.DataObject

      `DEFAULT_VERSION`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `HybridDataObject()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | `appendProperties(StringBuffer buffer)`
    `Object` | `readPropertyDirectly(String propName)` Returns mapped property value as curently stored in the DataObject.
    `protected void` | `readState(ObjectInputStream in)`
    `void` | `writePropertyDirectly(String propName, Object val)` Modifies a value of a named property without altering the object state in any way, and without triggering any database operations.
    `protected void` | `writeState(ObjectOutputStream out)`

    - ### Methods inherited from class org.apache.cayenne.BaseDataObject

      `addToManyTarget, beforePropertyRead, beforePropertyWrite, getSnapshotVersion, readNestedProperty, readProperty, readSerialized, removeToManyTarget, setObjectContext, setPersistenceState, setReverseRelationship, setSnapshotVersion, setToManyTarget, setToOneTarget, toString, toStringBuffer, unsetReverseRelationship, validateForDelete, validateForInsert, validateForSave, validateForUpdate, willConnect, writeProperty, writeSerialized`

    - ### Methods inherited from class org.apache.cayenne.PersistentObject

      `getMapKey, getObjectContext, getObjectId, getPersistenceState, setObjectId`

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

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

    - ### Methods inherited from interface org.apache.cayenne.Persistent

      `getObjectContext, getObjectId, getPersistenceState, setObjectId`

- - ### Field Detail

    - #### values

          protected Map<String,Object> values

  - ### Constructor Detail

    - #### HybridDataObject

          public HybridDataObject()

  - ### Method Detail

    - #### readPropertyDirectly

          public Object readPropertyDirectly(String propName)

      Description copied from interface: `DataObject`
      Returns mapped property value as curently stored in the DataObject. Returned value maybe a fault or a real value. This method will not attempt to resolve faults, or to read unmapped properties.
      Specified by:
        `readPropertyDirectly` in interface `DataObject`
      Overrides:
        `readPropertyDirectly` in class `BaseDataObject`

    - #### writePropertyDirectly

          public void writePropertyDirectly(String propName,
                                            Object val)

      Description copied from interface: `DataObject`
      Modifies a value of a named property without altering the object state in any way, and without triggering any database operations. This method is intended mostly for internal use by Cayenne framework, and shouldn't be called from the application code.
      Specified by:
        `writePropertyDirectly` in interface `DataObject`
      Overrides:
        `writePropertyDirectly` in class `BaseDataObject`

    - #### appendProperties

          protected void appendProperties(StringBuffer buffer)

      Overrides:
        `appendProperties` in class `BaseDataObject`

    - #### readState

          protected void readState(ObjectInputStream in)
                            throws IOException,
                                   ClassNotFoundException

      Overrides:
        `readState` in class `BaseDataObject`
      Throws:
        `IOException`
        `ClassNotFoundException`

    - #### writeState

          protected void writeState(ObjectOutputStream out)
                             throws IOException

      Overrides:
        `writeState` in class `BaseDataObject`
      Throws:
        `IOException`

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