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## org.hibernate.proxy
Class AbstractLazyInitializer

    java.lang.Object
      org.hibernate.proxy.AbstractLazyInitializer

All Implemented Interfaces:
  LazyInitializer

Direct Known Subclasses:
  BasicLazyInitializer, Dom4jLazyInitializer, MapLazyInitializer

    public abstract class AbstractLazyInitializer

extends Object
implements LazyInitializer

Convenience base class for lazy initialization handlers. Centralizes the basic plumbing of doing lazy initialization freeing subclasses to acts as essentially adapters to their intended entity mode and/or proxy generation strategy.

Author:
  Gavin King

Constructor Summary
`protected` | `AbstractLazyInitializer()` For serialization from the non-pojo initializers (HHH-3309)
`protected` | `AbstractLazyInitializer(String entityName, Serializable id, SessionImplementor session)` Main constructor.

Method Summary
`String` | `getEntityName()` The entity-name of the entity our owning proxy represents.
`Serializable` | `getIdentifier()` Retrieve the identifier value for the enity our owning proxy represents.
`Object` | `getImplementation()` Return the underlying persistent object, initializing if necessary
`Object` | `getImplementation(SessionImplementor s)` Return the underlying persistent object in the given `Session`, or null, do not initialize the proxy
`SessionImplementor` | `getSession()` Get the session to which this proxy is associated, or null if it is not attached.
`protected Object` | `getTarget()` Getter for property 'target'.
`void` | `initialize()` Initialize the proxy, fetching the target entity if necessary.
`protected boolean` | `isConnectedToSession()` Getter for property 'connectedToSession'.
`boolean` | `isReadOnly()` Is the proxy read-only?.
`protected Boolean` | `isReadOnlyBeforeAttachedToSession()` Get the read-only/modifiable setting that should be put in affect when it is attached to a session.
`boolean` | `isReadOnlySettingAvailable()` Is the proxy's read-only/modifiable setting available?
`boolean` | `isUninitialized()` Is the proxy uninitialzed?
`boolean` | `isUnwrap()`
`void` | `setIdentifier(Serializable id)` Set the identifier value for the enity our owning proxy represents.
`void` | `setImplementation(Object target)` Initialize the proxy manually by injecting its target.
`void` | `setReadOnly(boolean readOnly)` Set an associated modifiable proxy to read-only mode, or a read-only proxy to modifiable mode.
`void` | `setSession(SessionImplementor s)` Associate the proxy with the given session.
`void` | `setUnwrap(boolean unwrap)`
`void` | `unsetSession()` Unset this initializer's reference to session.

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

Methods inherited from interface org.hibernate.proxy.LazyInitializer
`getPersistentClass`

Constructor Detail

### AbstractLazyInitializer

    protected AbstractLazyInitializer()

  For serialization from the non-pojo initializers (HHH-3309)

### AbstractLazyInitializer

    protected AbstractLazyInitializer(String entityName,
                                      Serializable id,
                                      SessionImplementor session)

  Main constructor.

  Parameters:
    `entityName` - The name of the entity being proxied.
    `id` - The identifier of the entity being proxied.
    `session` - The session owning the proxy.

Method Detail

### getEntityName

    public final String getEntityName()

  The entity-name of the entity our owning proxy represents.

  Specified by:
    `getEntityName` in interface `LazyInitializer`
  Returns:
    The entity-name.

### getIdentifier

    public final Serializable getIdentifier()

  Retrieve the identifier value for the enity our owning proxy represents.

  Specified by:
    `getIdentifier` in interface `LazyInitializer`
  Returns:
    The identifier value.

### setIdentifier

    public final void setIdentifier(Serializable id)

  Set the identifier value for the enity our owning proxy represents.

  Specified by:
    `setIdentifier` in interface `LazyInitializer`
  Parameters:
    `id` - The identifier value.

### isUninitialized

    public final boolean isUninitialized()

  Is the proxy uninitialzed?

  Specified by:
    `isUninitialized` in interface `LazyInitializer`
  Returns:
    True if uninitialized; false otherwise.

### getSession

    public final SessionImplementor getSession()

  Get the session to which this proxy is associated, or null if it is not attached.

  Specified by:
    `getSession` in interface `LazyInitializer`
  Returns:
    The associated session.

### setSession

    public final void setSession(SessionImplementor s)
                          throws HibernateException

  Associate the proxy with the given session.

  Care should be given to make certain that the proxy is added to the session's persistence context as well to maintain the symetry of the association. That must be done seperately as this method simply sets an internal reference. We do also check that if there is already an associated session that the proxy reference was removed from that previous session's persistence contet.

  Specified by:
    `setSession` in interface `LazyInitializer`
  Parameters:
    `s` - The session
  Throws:
    `HibernateException` - Indicates that the proxy was still contained in the persistence context of the "previous session".

### unsetSession

    public final void unsetSession()

  Unset this initializer's reference to session. It is assumed that the caller is also taking care or cleaning up the owning proxy's reference in the persistence context.

  Generally speaking this is intended to be called only during `Session.evict(java.lang.Object)` and `Session.clear()` processing; most other use-cases should call `LazyInitializer.setSession(org.hibernate.engine.SessionImplementor)` instead.

  Specified by:
    `unsetSession` in interface `LazyInitializer`

### initialize

    public final void initialize()
                          throws HibernateException

  Initialize the proxy, fetching the target entity if necessary.

  Specified by:
    `initialize` in interface `LazyInitializer`
  Throws:
    `HibernateException` - Indicates a problem initializing the proxy.

### isConnectedToSession

    protected final boolean isConnectedToSession()

  Getter for property 'connectedToSession'.

  Returns:
    Value for property 'connectedToSession'.

### getImplementation

    public final Object getImplementation()

  Return the underlying persistent object, initializing if necessary

  Specified by:
    `getImplementation` in interface `LazyInitializer`
  Returns:
    The underlying target entity.

### setImplementation

    public final void setImplementation(Object target)

  Initialize the proxy manually by injecting its target.

  Specified by:
    `setImplementation` in interface `LazyInitializer`
  Parameters:
    `target` - The proxy target (the actual entity being proxied).

### getImplementation

    public final Object getImplementation(SessionImplementor s)
                                   throws HibernateException

  Return the underlying persistent object in the given `Session`, or null, do not initialize the proxy

  Specified by:
    `getImplementation` in interface `LazyInitializer`
  Parameters:
    `s` - The session to check
  Returns:
    The target, or null.
  Throws:
    `HibernateException` - Indicates problem locating the target.

### getTarget

    protected final Object getTarget()

  Getter for property 'target'.

  Same as `getImplementation()` except that this method will not force initialization.

  Returns:
    Value for property 'target'.

### isReadOnlySettingAvailable

    public final boolean isReadOnlySettingAvailable()

  Is the proxy's read-only/modifiable setting available?

  Specified by:
    `isReadOnlySettingAvailable` in interface `LazyInitializer`
  Returns:
    true, if the setting is available false, if the proxy is detached or its associated session is closed

### isReadOnly

    public final boolean isReadOnly()

  Is the proxy read-only?. The read-only/modifiable setting is not available when the proxy is detached or its associated session is closed. To check if the read-only/modifiable setting is available:

  Specified by:
    `isReadOnly` in interface `LazyInitializer`
  Returns:
    true, if this proxy is read-only; false, otherwise
  See Also:
    `LazyInitializer.isReadOnlySettingAvailable()`, `Session.isReadOnly(Object entityOrProxy)`

### setReadOnly

    public final void setReadOnly(boolean readOnly)

  Set an associated modifiable proxy to read-only mode, or a read-only proxy to modifiable mode. If the proxy is currently initialized, its implementation will be set to the same mode; otherwise, when the proxy is initialized, its implementation will have the same read-only/ modifiable setting as the proxy. In read-only mode, no snapshot is maintained and the instance is never dirty checked. If the associated proxy already has the specified read-only/modifiable setting, then this method does nothing.

  Specified by:
    `setReadOnly` in interface `LazyInitializer`
  See Also:
    `Session.setReadOnly(Object entityOrProxy, boolean readOnly)`

### isReadOnlyBeforeAttachedToSession

    protected final Boolean isReadOnlyBeforeAttachedToSession()

  Get the read-only/modifiable setting that should be put in affect when it is attached to a session. This method should only be called during serialization when read-only/modifiable setting is not available (i.e., isReadOnlySettingAvailable() == false)

  Throws:
    `IllegalStateException` - if isReadOnlySettingAvailable() == true

### isUnwrap

    public boolean isUnwrap()

  Specified by:
    `isUnwrap` in interface `LazyInitializer`

### setUnwrap

    public void setUnwrap(boolean unwrap)

  Specified by:
    `setUnwrap` in interface `LazyInitializer`

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