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/**
* Redistribution and use of this software and associated documentation ("Software"), with or
* without modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright statements and notices. Redistributions
* must also contain a copy of this document.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other materials provided with
* the distribution.
*
* 3. The name "Exolab" must not be used to endorse or promote products derived from this Software
* without prior written permission of Intalio, Inc. For written permission, please contact
* [email protected].
*
* 4. Products derived from this Software may not be called "Exolab" nor may "Exolab" appear in
* their names without prior written permission of Intalio, Inc. Exolab is a registered trademark of
* Intalio, Inc.
*
* 5. Due credit should be given to the Exolab Project (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESSED OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTALIO, INC. OR ITS
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 1999 (C) Intalio, Inc. All Rights Reserved.
*
* $Id$
*/
package org.exolab.castor.mapping;
import java.util.Enumeration;
/**
* Collection handler for adding/listing elements of a collection. A collection field will use this
* handler to add elements when it's value is set, and to enumerate then when it's value is
* retrieved. A collection handler is instantiated only once, must be thread safe and not use any
* synchronization.
*
* @author Assaf Arkin
* @version $Revision$ $Date: 2003-03-03 00:05:44 -0700 (Mon, 03 Mar 2003) $
*/
public interface CollectionHandler {
/**
* Add an object to the collection. A collection may not allow the same object to be added more
* than once. The collection is provided as a parameter and is returned as the return value if the
* returned collection is a different object. That way the handler can create a new collection or
* change the collection as necessary (e.g. when resizing an array).
*
* @param collection The collection, null if no collection has been created yet
* @param object The object to add to the collection
* @return The collection with the new object if a different instance than the collection
* parameter, null otherwise
* @throws ClassCastException The collection handler does not support collections of this type
*/
public Object add(Object collection, T object) throws ClassCastException;
/**
* Returns an enumeration of all the elements in the collection.
*
* @param collection The collection
* @return An enumeration of all the elements in the collection
* @throws ClassCastException The collection handler does not support collections of this type
*/
public Enumeration elements(Object collection) throws ClassCastException;
/**
* Returns the number of elements in the collection.
*
* @param collection The collection
* @return Number of elements in the collection
* @throws ClassCastException The collection handler does not support collections of this type
*/
public int size(Object collection) throws ClassCastException;
/**
* Clears the collection of any objects. The collection is provided as a parameter and is returned
* as the return value if the returned collection is a different object. That way the handler can
* create a new collection or change the collection as necessary (e.g. when resizing an array).
*
* @param collection The collection, null if no collection has been created yet
* @return The empty collection if a different instance than the collection parameter,
* null otherwise
* @throws ClassCastException The collection handler does not support collections of this type
*/
public Object clear(Object collection) throws ClassCastException;
}