package org.apache.ojb.broker.core.proxy;

 /* Copyright 2002-2005 The Apache Software Foundation

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 /**

  * Interface which Collection proxies need to implement to be

  * treated like collection proxies in ODMG.

  * <p> 

  * Presently the collection proxy impl class can be plugged in and

  * not implement this interface, but those implementations will

  * *not* be treated as proxies by OJB

  */

 public interface CollectionProxy

 {

     /**

      * Adds a listener to this collection.

      *

      * @param listener The listener to add

      */

     void addListener(CollectionProxyListener listener);

     /**

      * Removes the given listener from this collecton.

      *

      * @param listener The listener to remove

      */

     void removeListener(CollectionProxyListener listener);

     /**

      * Determines whether the collection data already has been loaded from the database.

      *

      * @return <code>true</code> if the data is already loaded

      */

     public boolean isLoaded();

 }