CascadingTypeHandler.java

/* This file is part of the db4o object database http://www.db4o.com

Copyright (C) 2004 - 2011  Versant Corporation http://www.versant.com

db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.

db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program.  If not, see http://www.gnu.org/licenses/. */
package com.db4o.typehandlers;

import com.db4o.internal.marshall.*;

/**
 * TypeHandler for objects with members.
 */
public interface CascadingTypeHandler extends TypeHandler4{
    
	/**
	 * will be called during activation if the handled
	 * object is already active 
	 * @param context
	 */
    void cascadeActivation(ActivationContext context);
    
    /**
     * will be called during querying to ask for the handler
     * to be used to collect children of the handled object
     * @param context
     * @return
     */
    TypeHandler4 readCandidateHandler(QueryingReadContext context);
    
    /**
     * will be called during querying to ask for IDs of member
     * objects of the handled object.
     * @param context
     */
    void collectIDs(QueryingReadContext context);

}