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/* Copyright (C) 2004 - 2005  db4objects Inc.  http://www.db4o.com

This file is part of the db4o open source object database.

db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.

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, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
package com.db4o;

import com.db4o.foundation.*;

class PendingClassInits {
	
	private final YapClassCollection _classColl;
	
	private Collection4 _pending = new Collection4();

	private Queue4 _members = new Queue4();
	private Queue4 _statics = new Queue4();
    private Queue4 _writes = new Queue4();
    private Queue4 _inits = new Queue4();
	
	private boolean _running = false;
	
	PendingClassInits(YapClassCollection classColl){
		_classColl = classColl;
	}
	
	void process(YapClass newYapClass) {
		
		if(_pending.contains(newYapClass)) {
			return;
		}
		
        YapClass ancestor = newYapClass.getAncestor();
        if (ancestor != null) {
            process(ancestor);
        }
		
		_pending.add(newYapClass);
        
        _members.add(newYapClass);
        
		
		if(_running) {
			return;
		}
		
		_running = true;
		
		checkInits();
		
		_pending = new Collection4();
		
		_running = false;
	}

	
	private void checkMembers() {
		while(_members.hasNext()) {
			YapClass yc = (YapClass)_members.next();
			yc.addMembers(_classColl.i_stream);
            _statics.add(yc);
		}
	}
	
	private void checkStatics() {
		checkMembers();
		while(_statics.hasNext()) {
			YapClass yc = (YapClass)_statics.next();
			yc.storeStaticFieldValues(_classColl.i_systemTrans, true);
			_writes.add(yc);
			checkMembers();
		}
	}
	
	private void checkWrites() {
		checkStatics();
		while(_writes.hasNext()) {
			YapClass yc = (YapClass)_writes.next();
	        yc.setStateDirty();
	        yc.write(_classColl.i_systemTrans);
            _inits.add(yc);
			checkStatics();
		}
	}
    
    private void checkInits() {
        checkWrites();
        while(_inits.hasNext()) {
            YapClass yc = (YapClass)_inits.next();
            yc.initConfigOnUp(_classColl.i_systemTrans);
            checkWrites();
        }
    }


}