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Java > Open Source Codes > org > apache > ojb > broker > core > proxy > CollectionProxy


1 package org.apache.ojb.broker.core.proxy;
2
3 /* Copyright 2002-2005 The Apache Software Foundation
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 /**
19  * Interface which Collection proxies need to implement to be
20  * treated like collection proxies in ODMG.
21  * <p>
22  * Presently the collection proxy impl class can be plugged in and
23  * not implement this interface, but those implementations will
24  * *not* be treated as proxies by OJB
25  */
26 public interface CollectionProxy
27 {
28     /**
29      * Adds a listener to this collection.
30      *
31      * @param listener The listener to add
32      */
33     void addListener(CollectionProxyListener listener);
34
35     /**
36      * Removes the given listener from this collecton.
37      *
38      * @param listener The listener to remove
39      */
40     void removeListener(CollectionProxyListener listener);
41
42     /**
43      * Determines whether the collection data already has been loaded from the database.
44      *
45      * @return <code>true</code> if the data is already loaded
46      */
47     public boolean isLoaded();
48 }
49
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