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## org.apache.cayenne
Class CayenneDataObject

    java.lang.Object
      org.apache.cayenne.CayenneDataObject

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

    public class CayenneDataObject

extends Object
implements DataObject, Validating, XMLSerializable

A default implementation of DataObject interface. It is normally used as a superclass of Cayenne persistent objects.

Author:
  Andrus Adamchik
See Also:
  Serialized Form

Field Summary
`protected ObjectContext` | `objectContext`
`protected ObjectId` | `objectId`
`protected int` | `persistenceState`
`protected long` | `snapshotVersion`
`protected Map<String,Object>` | `values`

Fields inherited from interface org.apache.cayenne.DataObject
`DEFAULT_VERSION`

Constructor Summary
`CayenneDataObject()`

Method Summary
`void` | `addToManyTarget(String relName, DataObject value, boolean setReverse)` Adds an object to a to-many relationship.
`protected void` | `appendProperties(StringBuffer buffer)`
`void` | `decodeFromXML(XMLDecoder decoder)` Decodes itself from XML using the provided XMLDecoder.
`void` | `encodeAsXML(XMLEncoder encoder)` Encodes object to XML using provided encoder.
`void` | `fetchFinished()` Deprecated. since 3.0 use callbacks.
`DataContext` | `getDataContext()` Deprecated. since 3.0 use `getObjectContext()`.
`ObjectContext` | `getObjectContext()` Returns this object's DataContext.
`ObjectId` | `getObjectId()`
`ObjEntity` | `getObjEntity()` Returns mapped ObjEntity for this object.
`int` | `getPersistenceState()`
`long` | `getSnapshotVersion()` Returns a version of a DataRow snapshot that was used to create this object.
`Object` | `readNestedProperty(String path)` Returns a value of the property identified by a property path.
`Object` | `readProperty(String propertyName)` Returns a value of the property identified by propName.
`Object` | `readPropertyDirectly(String propName)` Returns mapped property value as curently stored in the DataObject.
`void` | `removeToManyTarget(String relName, DataObject value, boolean setReverse)` Removes an object from a to-many relationship.
`void` | `setDataContext(DataContext dataContext)` Deprecated. since 3.0 use `setObjectContext(ObjectContext)`.
`void` | `setObjectContext(ObjectContext objectContext)`
`void` | `setObjectId(ObjectId objectId)`
`void` | `setPersistenceState(int persistenceState)`
`protected void` | `setReverseRelationship(String relName, DataObject val)` Initializes reverse relationship from object `val` to this object.
`void` | `setSnapshotVersion(long snapshotVersion)`
`void` | `setToOneTarget(String relationshipName, DataObject value, boolean setReverse)` Sets to-one relationship to a new value.
`String` | `toString()`
`StringBuffer` | `toStringBuffer(StringBuffer buffer, boolean fullDesc)` A variation of "toString" method, that may be more efficient in some cases.
`protected void` | `unsetReverseRelationship(String relName, DataObject val)` Removes current object from reverse relationship of object `val` to this object.
`void` | `validateForDelete(ValidationResult validationResult)` This implementation does nothing.
`void` | `validateForInsert(ValidationResult validationResult)` Calls `validateForSave(ValidationResult)`.
`protected void` | `validateForSave(ValidationResult validationResult)` Performs property validation of the object, appending any validation failures to the provided validationResult object.
`void` | `validateForUpdate(ValidationResult validationResult)` Calls `validateForSave(ValidationResult)`.
`protected void` | `willConnect(String relationshipName, Persistent object)` Called before establishing a relationship with another object.
`void` | `writeProperty(String propName, Object val)` Sets the property to the new value.
`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.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### snapshotVersion

    protected long snapshotVersion

### objectId

    protected ObjectId objectId

### persistenceState

    protected transient int persistenceState

### objectContext

    protected transient ObjectContext objectContext

### values

    protected Map<String,Object> values

Constructor Detail

### CayenneDataObject

    public CayenneDataObject()

Method Detail

### getDataContext

    public DataContext getDataContext()

  Deprecated. since 3.0 use `getObjectContext()`.

  Returns a DataContext that holds this object. Object becomes associated with a DataContext either when the object is fetched using a query, or when a new object is registered explicitly with a DataContext.

  Specified by:
    `getDataContext` in interface `DataObject`

### setDataContext

    public void setDataContext(DataContext dataContext)

  Deprecated. since 3.0 use `setObjectContext(ObjectContext)`.

  Sets object DataContext.

  Specified by:
    `setDataContext` in interface `DataObject`

### getObjEntity

    public ObjEntity getObjEntity()

  Returns mapped ObjEntity for this object. If an object is transient or is not mapped returns null.

  Since:
    1.2

### getObjectId

    public ObjectId getObjectId()

  Specified by:
    `getObjectId` in interface `Persistent`

### setObjectId

    public void setObjectId(ObjectId objectId)

  Specified by:
    `setObjectId` in interface `Persistent`

### getPersistenceState

    public int getPersistenceState()

  Specified by:
    `getPersistenceState` in interface `Persistent`

### setPersistenceState

    public void setPersistenceState(int persistenceState)

  Specified by:
    `setPersistenceState` in interface `Persistent`

### readNestedProperty

    public Object readNestedProperty(String path)

  Description copied from interface: `DataObject`
  Returns a value of the property identified by a property path. Supports reading both mapped and unmapped properties. Unmapped properties are accessed in a manner consistent with JavaBeans specification.

  Property path (or nested property) is a dot-separated path used to traverse object relationships until the final object is found. If a null object found while traversing path, null is returned. If a list is encountered in the middle of the path, CayenneRuntimeException is thrown. Unlike `DataObject.readPropertyDirectly(String)`, this method will resolve an object if it is HOLLOW.

  Examples:

  - Read this object property:
    `String name = (String)artist.readNestedProperty("name");`
  - Read an object related to this object:
    `Gallery g = (Gallery)paintingInfo.readNestedProperty("toPainting.toGallery");`
  - Read a property of an object related to this object:
    `String name = (String)painting.readNestedProperty("toArtist.artistName");`
  - Read to-many relationship list:
    `List exhibits = (List)painting.readNestedProperty("toGallery.exhibitArray");`
  - Read to-many relationship in the middle of the path (throws exception):
    `String name = (String)artist.readNestedProperty("paintingArray.paintingName");`

  Specified by:
    `readNestedProperty` in interface `DataObject`

### readProperty

    public Object readProperty(String propertyName)

  Description copied from interface: `DataObject`
  Returns a value of the property identified by propName. Resolves faults if needed. This method can safely be used instead of or in addition to the auto-generated property accessors in subclasses of CayenneDataObject.

  Specified by:
    `readProperty` in interface `DataObject`

### 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`

### writeProperty

    public void writeProperty(String propName,
                              Object val)

  Description copied from interface: `DataObject`
  Sets the property to the new value. Resolves faults if needed. This method can be safely used instead of or in addition to the auto-generated property modifiers to set simple properties. Note that to set to-one relationships use `DataObject.setToOneTarget(String, DataObject, boolean)`.

  Specified by:
    `writeProperty` in interface `DataObject`
  Parameters:
    `propName` - a name of the bean property being modified.
    `val` - a new value of the property.

### 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`

### removeToManyTarget

    public void removeToManyTarget(String relName,
                                   DataObject value,
                                   boolean setReverse)

  Description copied from interface: `DataObject`
  Removes an object from a to-many relationship.

  Specified by:
    `removeToManyTarget` in interface `DataObject`

### addToManyTarget

    public void addToManyTarget(String relName,
                                DataObject value,
                                boolean setReverse)

  Description copied from interface: `DataObject`
  Adds an object to a to-many relationship.

  Specified by:
    `addToManyTarget` in interface `DataObject`

### setToOneTarget

    public void setToOneTarget(String relationshipName,
                               DataObject value,
                               boolean setReverse)

  Description copied from interface: `DataObject`
  Sets to-one relationship to a new value. Resolves faults if needed. This method can safely be used instead of or in addition to the auto-generated property modifiers to set properties that are to-one relationships.

  Specified by:
    `setToOneTarget` in interface `DataObject`
  Parameters:
    `relationshipName` - a name of the bean property being modified - same as the name of ObjRelationship.
    `value` - a new value of the property.
    `setReverse` - whether to update the reverse relationship pointing from the old and new values of the property to this object.

### willConnect

    protected void willConnect(String relationshipName,
                               Persistent object)

  Called before establishing a relationship with another object. Applies "persistence by reachability" logic, pulling one of the two objects to a DataConext of another object in case one of the objects is transient. If both objects are persistent, and they don't have the same DataContext, CayenneRuntimeException is thrown.

  Since:
    1.2

### setReverseRelationship

    protected void setReverseRelationship(String relName,
                                          DataObject val)

  Initializes reverse relationship from object `val` to this object.

  Parameters:
    `relName` - name of relationship from this object to `val`.

### unsetReverseRelationship

    protected void unsetReverseRelationship(String relName,
                                            DataObject val)

  Removes current object from reverse relationship of object `val` to this object.

### toStringBuffer

    public StringBuffer toStringBuffer(StringBuffer buffer,
                                       boolean fullDesc)

  A variation of "toString" method, that may be more efficient in some cases. For example when printing a list of objects into the same String.

### appendProperties

    protected void appendProperties(StringBuffer buffer)

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### fetchFinished

    public void fetchFinished()

  Deprecated. since 3.0 use callbacks.

  Default implementation does nothing.

  Specified by:
    `fetchFinished` in interface `DataObject`
  See Also:
    `LifecycleListener`

### getSnapshotVersion

    public long getSnapshotVersion()

  Returns a version of a DataRow snapshot that was used to create this object.

  Specified by:
    `getSnapshotVersion` in interface `DataObject`
  Since:
    1.1

### setSnapshotVersion

    public void setSnapshotVersion(long snapshotVersion)

  Specified by:
    `setSnapshotVersion` in interface `DataObject`
  Since:
    1.1

### validateForSave

    protected void validateForSave(ValidationResult validationResult)

  Performs property validation of the object, appending any validation failures to the provided validationResult object. This method is invoked from "validateFor.." before committing a NEW or MODIFIED object to the database. Validation includes checking for null values and value sizes. CayenneDataObject subclasses may override this method, calling super.

  Since:
    1.1

### validateForInsert

    public void validateForInsert(ValidationResult validationResult)

  Calls `validateForSave(ValidationResult)`. CayenneDataObject subclasses may override it providing validation logic that should be executed for the newly created objects before saving them.

  Specified by:
    `validateForInsert` in interface `Validating`
  Since:
    1.1

### validateForUpdate

    public void validateForUpdate(ValidationResult validationResult)

  Calls `validateForSave(ValidationResult)`. CayenneDataObject subclasses may override it providing validation logic that should be executed for the modified objects before saving them.

  Specified by:
    `validateForUpdate` in interface `Validating`
  Since:
    1.1

### validateForDelete

    public void validateForDelete(ValidationResult validationResult)

  This implementation does nothing. CayenneDataObject subclasses may override it providing validation logic that should be executed for the deleted objects before committing them.

  Specified by:
    `validateForDelete` in interface `Validating`
  Since:
    1.1

### encodeAsXML

    public void encodeAsXML(XMLEncoder encoder)

  Encodes object to XML using provided encoder.

  Specified by:
    `encodeAsXML` in interface `XMLSerializable`
  Parameters:
    `encoder` - The encoder object.
  Since:
    1.2

### decodeFromXML

    public void decodeFromXML(XMLDecoder decoder)

  Description copied from interface: `XMLSerializable`
  Decodes itself from XML using the provided XMLDecoder.

  Specified by:
    `decodeFromXML` in interface `XMLSerializable`
  Parameters:
    `decoder` - The decoder object.

### getObjectContext

    public ObjectContext getObjectContext()

  Returns this object's DataContext.

  Specified by:
    `getObjectContext` in interface `Persistent`
  Since:
    1.2

### setObjectContext

    public void setObjectContext(ObjectContext objectContext)

  Specified by:
    `setObjectContext` in interface `Persistent`
  Since:
    1.2

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