Package org.hibernate

Interface Interceptor

  • All Known Implementing Classes:
    EmptyInterceptor
    public interface Interceptor
    Allows user code to inspect and/or change property values. Inspection occurs before property values are written and after they are read from the database. There might be a single instance of Interceptor for a SessionFactory, or a new instance might be specified for each Session. Whichever approach is used, the interceptor must be serializable if the Session is to be serializable. This means that SessionFactory-scoped interceptors should implement readResolve(). The Session may not be invoked from a callback (nor may a callback cause a collection or proxy to be lazily initialized). Instead of implementing this interface directly, it is usually better to extend EmptyInterceptor and override only the callback methods of interest.
    See Also:
    SessionBuilder.interceptor(Interceptor), SharedSessionBuilder.interceptor(), Configuration.setInterceptor(Interceptor), EmptyInterceptor

    • Method Summary

      All Methods Instance Methods Abstract Methods Deprecated Methods 
      Modifier and Type Method Description
      void afterTransactionBegin​(Transaction tx)
      Called when a Hibernate transaction is begun via the Hibernate Transaction API.
      void afterTransactionCompletion​(Transaction tx)
      Called after a transaction is committed or rolled back.
      void beforeTransactionCompletion​(Transaction tx)
      Called before a transaction is committed (but not before rollback).
      int[] findDirty​(java.lang.Object entity, java.io.Serializable id, java.lang.Object[] currentState, java.lang.Object[] previousState, java.lang.String[] propertyNames, Type[] types)
      Called from flush().
      java.lang.Object getEntity​(java.lang.String entityName, java.io.Serializable id)
      Get a fully loaded entity instance that is cached externally.
      java.lang.String getEntityName​(java.lang.Object object)
      Get the entity name for a persistent or transient instance.
      java.lang.Object instantiate​(java.lang.String entityName, EntityMode entityMode, java.io.Serializable id)
      Instantiate the entity class.
      java.lang.Boolean isTransient​(java.lang.Object entity)
      Called to distinguish between transient and detached entities.
      void onCollectionRecreate​(java.lang.Object collection, java.io.Serializable key)
      Called before a collection is (re)created.
      void onCollectionRemove​(java.lang.Object collection, java.io.Serializable key)
      Called before a collection is deleted.
      void onCollectionUpdate​(java.lang.Object collection, java.io.Serializable key)
      Called before a collection is updated.
      void onDelete​(java.lang.Object entity, java.io.Serializable id, java.lang.Object[] state, java.lang.String[] propertyNames, Type[] types)
      Called before an object is deleted.
      boolean onFlushDirty​(java.lang.Object entity, java.io.Serializable id, java.lang.Object[] currentState, java.lang.Object[] previousState, java.lang.String[] propertyNames, Type[] types)
      Called when an object is detected to be dirty, during a flush.
      boolean onLoad​(java.lang.Object entity, java.io.Serializable id, java.lang.Object[] state, java.lang.String[] propertyNames, Type[] types)
      Called just before an object is initialized.
      java.lang.String onPrepareStatement​(java.lang.String sql)
      Deprecated.
      Supply a StatementInspector instead, if you wish to inspect and alter SQL statements.
      boolean onSave​(java.lang.Object entity, java.io.Serializable id, java.lang.Object[] state, java.lang.String[] propertyNames, Type[] types)
      Called before an object is saved.
      void postFlush​(java.util.Iterator entities)
      Called after a flush that actually ends in execution of the SQL statements required to synchronize in-memory state with the database.
      void preFlush​(java.util.Iterator entities)
      Called before a flush.

    • Method Detail

      • onLoad

        boolean onLoad​(java.lang.Object entity,
               java.io.Serializable id,
               java.lang.Object[] state,
               java.lang.String[] propertyNames,
               Type[] types)
        throws CallbackException
        Called just before an object is initialized. The interceptor may change the state, which will be propagated to the persistent object. Note that when this method is called, entity will be an empty uninitialized instance of the class.

        NOTE: The indexes across the state, propertyNames and types arrays match.

        Parameters:
        entity - The entity instance being loaded
        id - The identifier value being loaded
        state - The entity state (which will be pushed into the entity instance)
        propertyNames - The names of the entity properties, corresponding to the state.
        types - The types of the entity properties, corresponding to the state.
        Returns:
        true if the user modified the state in any way.
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • onFlushDirty

        boolean onFlushDirty​(java.lang.Object entity,
                     java.io.Serializable id,
                     java.lang.Object[] currentState,
                     java.lang.Object[] previousState,
                     java.lang.String[] propertyNames,
                     Type[] types)
              throws CallbackException
        Called when an object is detected to be dirty, during a flush. The interceptor may modify the detected currentState, which will be propagated to both the database and the persistent object. Note that not all flushes end in actual synchronization with the database, in which case the new currentState will be propagated to the object, but not necessarily (immediately) to the database. It is strongly recommended that the interceptor not modify the previousState.

        NOTE: The indexes across the currentState, previousState, propertyNames and types arrays match.

        Parameters:
        entity - The entity instance detected as being dirty and being flushed
        id - The identifier of the entity
        currentState - The entity's current state
        previousState - The entity's previous (load time) state.
        propertyNames - The names of the entity properties
        types - The types of the entity properties
        Returns:
        true if the user modified the currentState in any way.
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • onSave

        boolean onSave​(java.lang.Object entity,
               java.io.Serializable id,
               java.lang.Object[] state,
               java.lang.String[] propertyNames,
               Type[] types)
        throws CallbackException
        Called before an object is saved. The interceptor may modify the state, which will be used for the SQL INSERT and propagated to the persistent object.
        Parameters:
        entity - The entity instance whose state is being inserted
        id - The identifier of the entity
        state - The state of the entity which will be inserted
        propertyNames - The names of the entity properties.
        types - The types of the entity properties
        Returns:
        true if the user modified the state in any way.
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • onDelete

        void onDelete​(java.lang.Object entity,
              java.io.Serializable id,
              java.lang.Object[] state,
              java.lang.String[] propertyNames,
              Type[] types)
       throws CallbackException
        Called before an object is deleted. It is not recommended that the interceptor modify the state.
        Parameters:
        entity - The entity instance being deleted
        id - The identifier of the entity
        state - The state of the entity
        propertyNames - The names of the entity properties.
        types - The types of the entity properties
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • onCollectionRecreate

        void onCollectionRecreate​(java.lang.Object collection,
                          java.io.Serializable key)
                   throws CallbackException
        Called before a collection is (re)created.
        Parameters:
        collection - The collection instance.
        key - The collection key value.
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • onCollectionRemove

        void onCollectionRemove​(java.lang.Object collection,
                        java.io.Serializable key)
                 throws CallbackException
        Called before a collection is deleted.
        Parameters:
        collection - The collection instance.
        key - The collection key value.
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • onCollectionUpdate

        void onCollectionUpdate​(java.lang.Object collection,
                        java.io.Serializable key)
                 throws CallbackException
        Called before a collection is updated.
        Parameters:
        collection - The collection instance.
        key - The collection key value.
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • preFlush

        void preFlush​(java.util.Iterator entities)
       throws CallbackException
        Called before a flush.
        Parameters:
        entities - The entities to be flushed.
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • postFlush

        void postFlush​(java.util.Iterator entities)
        throws CallbackException
        Called after a flush that actually ends in execution of the SQL statements required to synchronize in-memory state with the database.
        Parameters:
        entities - The entities that were flushed.
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • isTransient

        java.lang.Boolean isTransient​(java.lang.Object entity)
        Called to distinguish between transient and detached entities. The return value determines the state of the entity with respect to the current session.
        • Boolean.TRUE - the entity is transient
        • Boolean.FALSE - the entity is detached
        • null - Hibernate uses the unsaved-value mapping and other heuristics to determine if the object is unsaved
        Parameters:
        entity - a transient or detached entity
        Returns:
        Boolean or null to choose default behaviour

      • findDirty

        int[] findDirty​(java.lang.Object entity,
                java.io.Serializable id,
                java.lang.Object[] currentState,
                java.lang.Object[] previousState,
                java.lang.String[] propertyNames,
                Type[] types)
        Called from flush(). The return value determines whether the entity is updated
        • an array of property indices - the entity is dirty
        • an empty array - the entity is not dirty
        • null - use Hibernate's default dirty-checking algorithm
        Parameters:
        entity - The entity for which to find dirty properties.
        id - The identifier of the entity
        currentState - The current entity state as taken from the entity instance
        previousState - The state of the entity when it was last synchronized (generally when it was loaded)
        propertyNames - The names of the entity properties.
        types - The types of the entity properties
        Returns:
        array of dirty property indices or null to indicate Hibernate should perform default behaviour
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • instantiate

        java.lang.Object instantiate​(java.lang.String entityName,
                             EntityMode entityMode,
                             java.io.Serializable id)
                      throws CallbackException
        Instantiate the entity class. Return null to indicate that Hibernate should use the default constructor of the class. The identifier property of the returned instance should be initialized with the given identifier.
        Parameters:
        entityName - the name of the entity
        entityMode - The type of entity instance to be returned.
        id - the identifier of the new instance
        Returns:
        an instance of the class, or null to choose default behaviour
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • getEntityName

        java.lang.String getEntityName​(java.lang.Object object)
                        throws CallbackException
        Get the entity name for a persistent or transient instance.
        Parameters:
        object - an entity instance
        Returns:
        the name of the entity
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • getEntity

        java.lang.Object getEntity​(java.lang.String entityName,
                           java.io.Serializable id)
                    throws CallbackException
        Get a fully loaded entity instance that is cached externally.
        Parameters:
        entityName - the name of the entity
        id - the instance identifier
        Returns:
        a fully initialized entity
        Throws:
        CallbackException - Thrown if the interceptor encounters any problems handling the callback.

      • afterTransactionBegin

        void afterTransactionBegin​(Transaction tx)
        Called when a Hibernate transaction is begun via the Hibernate Transaction API. Will not be called if transactions are being controlled via some other mechanism (CMT, for example).
        Parameters:
        tx - The Hibernate transaction facade object

      • beforeTransactionCompletion

        void beforeTransactionCompletion​(Transaction tx)
        Called before a transaction is committed (but not before rollback).
        Parameters:
        tx - The Hibernate transaction facade object

      • afterTransactionCompletion

        void afterTransactionCompletion​(Transaction tx)
        Called after a transaction is committed or rolled back.
        Parameters:
        tx - The Hibernate transaction facade object

      • onPrepareStatement

        @Deprecated
java.lang.String onPrepareStatement​(java.lang.String sql)
        Deprecated.
        Supply a StatementInspector instead, if you wish to inspect and alter SQL statements.
        Called when sql string is being prepared.
        Parameters:
        sql - sql to be prepared
        Returns:
        original or modified sql