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## org.apache.cayenne
Interface ObjectContext

All Superinterfaces:
  Serializable

All Known Implementing Classes:
  BaseContext, CayenneContext, DataContext

    public interface ObjectContext

extends Serializable

A Cayenne object facade to a persistent store. Instances of ObjectContext are used in the application code to access Cayenne persistence features.

Since:
  1.2

Method Summary
`void` | `commitChanges()` Flushes all changes to objects in this context to the parent DataChannel, cascading flush operation all the way through the stack, ultimately saving data in the database.
`void` | `commitChangesToParent()` Flushes all changes to objects in this context to the parent DataChannel.
`ObjectContext` | `createChildContext()` Deprecated. Since 3.1 replaced by `CayenneRuntime.getContext(DataChannel)`
`Collection<?>` | `deletedObjects()` Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.DELETED
`void` | `deleteObject(Object object)` Schedules a persistent object for deletion on next commit.
`void` | `deleteObjects(Collection<?> objects)` Schedules deletion of a collection of persistent objects.
`
`<T> void`
` | `deleteObjects(T... objects)` Schedules deletion of one or more persistent objects.
`DataChannel` | `getChannel()` Returns an DataChannel used by this context.
`EntityResolver` | `getEntityResolver()` Returns EntityResolver that stores all mapping information accessible by this ObjectContext.
`GraphManager` | `getGraphManager()` Returns GraphManager that manages object graph associated with this context.
`Object` | `getUserProperty(String key)` Returns a user-defined property previously set via 'setUserProperty'.
`boolean` | `hasChanges()` Returns `true` if there are any modified, deleted or new objects registered with this ObjectContext, `false` otherwise.
`void` | `invalidateObjects(Collection<?> objects)` Invalidates a Collection of persistent objects.
`
`<T> void`
` | `invalidateObjects(T... objects)` Invalidates one or more persistent objects.
`Persistent` | `localObject(ObjectId id, Object prototype)` Deprecated. since 3.1 Cayenne users should use `localObject(Object)`; the internal code has been refactored to avoid using this method all together.
`
`<T> T`
` | `localObject(T objectFromAnotherContext)` Returns a local copy of 'objectFromAnotherContext' object.
`Collection<?>` | `modifiedObjects()` Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.MODIFIED
`
`<T> T`
` | `newObject(Class<T> persistentClass)` Creates a new persistent object of a given class scheduled to be inserted to the database on next commit.
`Collection<?>` | `newObjects()` Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.NEW
`QueryResponse` | `performGenericQuery(Query query)` Executes any kind of query providing the result in a form of QueryResponse.
`List` | `performQuery(Query query)` Executes a selecting query, returning a list of persistent objects or data rows.
`void` | `prepareForAccess(Persistent object, String property, boolean lazyFaulting)` A callback method that child Persistent objects are expected to call before accessing property values.
`void` | `propertyChanged(Persistent object, String property, Object oldValue, Object newValue)` A callback method that child Persistent objects are expected to call from inside the setter after modifying a value of a persistent property, including "simple" and "arc" properties.
`void` | `registerNewObject(Object object)` Registers a transient object with the context.
`void` | `rollbackChanges()` Resets all uncommitted changes made to the objects in this ObjectContext, cascading rollback operation all the way through the stack.
`void` | `rollbackChangesLocally()` Resets all uncommitted changes made to the objects in this ObjectContext.
`void` | `setUserProperty(String key, Object value)` Sets a user-defined property.
`Collection<?>` | `uncommittedObjects()` Returns a collection of MODIFIED, DELETED or NEW objects.

Method Detail

### getEntityResolver

    EntityResolver getEntityResolver()

  Returns EntityResolver that stores all mapping information accessible by this ObjectContext.

### newObjects

    Collection<?> newObjects()

  Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.NEW

### deletedObjects

    Collection<?> deletedObjects()

  Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.DELETED

### modifiedObjects

    Collection<?> modifiedObjects()

  Returns a collection of objects that are registered with this ObjectContext and have a state PersistenceState.MODIFIED

### uncommittedObjects

    Collection<?> uncommittedObjects()

  Returns a collection of MODIFIED, DELETED or NEW objects.

### localObject

    @Deprecated
    Persistent localObject(ObjectId id,
                                      Object prototype)

  Deprecated. since 3.1 Cayenne users should use `localObject(Object)`; the internal code has been refactored to avoid using this method all together.

  Returns an object local to this ObjectContext and matching the ObjectId. If `prototype` is not null, local object is refreshed with the prototype values.

  This method can do both "mapping" (i.e. finding an object with the same id in this context) and "synchronization" (i.e. updating the state of the found object with the state of the prototype object).

### localObject

    <T> T localObject(T objectFromAnotherContext)

  Returns a local copy of 'objectFromAnotherContext' object. "Local" means that the returned object is registered in this context. If the local object hasn't been previously cached in this context, a hollow object is created and returned to the caller. No DB query is performed to resolve an object.

  Note that passing an object with a non-existing id, may later result in FaultFailureException on attempt to read returned object properties.

  Since:
    3.1

### newObject

    <T> T newObject(Class<T> persistentClass)

  Creates a new persistent object of a given class scheduled to be inserted to the database on next commit.

### registerNewObject

    void registerNewObject(Object object)

  Registers a transient object with the context. The difference with `newObject(Class)` is that a user creates an object herself, before attaching it to the context, instead of relying on Cayenne to do that.

  Parameters:
    `object` - new object that needs to be made persistent.
  Since:
    3.0

### deleteObject

    void deleteObject(Object object)
                      throws DeleteDenyException

  Schedules a persistent object for deletion on next commit.

  Throws:
    `DeleteDenyException` - if a `DeleteRule.DENY` delete rule is applicable for object deletion.

### deleteObjects

    void deleteObjects(Collection<?> objects)
                       throws DeleteDenyException

  Schedules deletion of a collection of persistent objects.

  Throws:
    `DeleteDenyException` - if a `DeleteRule.DENY` delete rule is applicable for object deletion.

### deleteObjects

    <T> void deleteObjects(T... objects)
                       throws DeleteDenyException

  Schedules deletion of one or more persistent objects. Same as `deleteObjects(Collection)` only with a vararg argument list for easier deletion of individual objects.

  Throws:
    `DeleteDenyException` - if a `DeleteRule.DENY` delete rule is applicable for object deletion.
  Since:
    3.1

### prepareForAccess

    void prepareForAccess(Persistent object,
                          String property,
                          boolean lazyFaulting)

  A callback method that child Persistent objects are expected to call before accessing property values. This callback allows ObjectContext to "inflate" unresolved objects on demand and also resolve properties that rely on lazy faulting.

  Since:
    3.0

### propertyChanged

    void propertyChanged(Persistent object,
                         String property,
                         Object oldValue,
                         Object newValue)

  A callback method that child Persistent objects are expected to call from inside the setter after modifying a value of a persistent property, including "simple" and "arc" properties.

### commitChanges

    void commitChanges()

  Flushes all changes to objects in this context to the parent DataChannel, cascading flush operation all the way through the stack, ultimately saving data in the database.

### commitChangesToParent

    void commitChangesToParent()

  Flushes all changes to objects in this context to the parent DataChannel. Same as `commitChanges()`, but no cascading flush occurs.

### rollbackChanges

    void rollbackChanges()

  Resets all uncommitted changes made to the objects in this ObjectContext, cascading rollback operation all the way through the stack.

### rollbackChangesLocally

    void rollbackChangesLocally()

  Resets all uncommitted changes made to the objects in this ObjectContext. Same as `rollbackChanges()()`, but rollback is local to this context and no cascading changes undoing occurs.

### performQuery

    List performQuery(Query query)

  Executes a selecting query, returning a list of persistent objects or data rows.

### performGenericQuery

    QueryResponse performGenericQuery(Query query)

  Executes any kind of query providing the result in a form of QueryResponse.

### getGraphManager

    GraphManager getGraphManager()

  Returns GraphManager that manages object graph associated with this context.

### getChannel

    DataChannel getChannel()

  Returns an DataChannel used by this context.

### createChildContext

    @Deprecated
    ObjectContext createChildContext()

  Deprecated. Since 3.1 replaced by `CayenneRuntime.getContext(DataChannel)`

  Creates and returns a new child ObjectContext.

  Since:
    3.0

### hasChanges

    boolean hasChanges()

  Returns `true` if there are any modified, deleted or new objects registered with this ObjectContext, `false` otherwise.

  Since:
    3.0

### invalidateObjects

    void invalidateObjects(Collection<?> objects)

  Invalidates a Collection of persistent objects. This operation only applies to the objects already committed to the database and does nothing to the NEW objects. It would remove each object's snapshot from caches and change object's state to HOLLOW. On the next access to this object, the object will be refetched.

### invalidateObjects

    <T> void invalidateObjects(T... objects)

  Invalidates one or more persistent objects. Same as `invalidateObjects(Collection)` only with a vararg argument list for easier invalidation of individual objects. If no arguments are passed to this method, it does nothing.

  Since:
    3.1

### getUserProperty

    Object getUserProperty(String key)

  Returns a user-defined property previously set via 'setUserProperty'. Concurrent access to properties does not require any special synchronization

  Since:
    3.0

### setUserProperty

    void setUserProperty(String key,
                         Object value)

  Sets a user-defined property. Concurrent access to properties does not require any special synchronization

  Since:
    3.0

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