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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.ext.*;
import com.db4o.foundation.*;
import com.db4o.inside.*;

class Sessions extends Collection4{
	
	
	void forEach(Visitor4 visitor){
		synchronized(Db4o.lock){
			Iterator4 i = iterator();
			while(i.hasNext()){
				visitor.visit(i.next());
			}
		}
	}

	ObjectContainer open(String databaseFileName) {
		
		synchronized(Db4o.lock){
			ObjectContainer oc = null;
			Session newSession = new Session(databaseFileName);
	
			Session oldSession = (Session) get(newSession);
			if (oldSession != null) {
				oc = oldSession.subSequentOpen();
				if (oc == null) {
					remove(oldSession);
				}
				return oc;
			}
			
			if (Deploy.debug) {
				System.out.println("db4o Debug is ON");
				if (!Deploy.flush) {
					System.out.println("Debug option set NOT to flush file.");
				}
				try{
				    oc = new YapRandomAccessFile(newSession);
				}catch(Exception e){
				    e.printStackTrace();
				}
			} else {
				try {
					oc = new YapRandomAccessFile(newSession);
				} catch (LongJumpOutException e) {
					throw e;
				} catch (DatabaseFileLockedException e) {
					throw e;
				} catch (ObjectNotStorableException e) {
					throw e;
				} catch (UserException eu) {
					Exceptions4.throwRuntimeException(eu.errCode, eu.errMsg);
				} catch (Throwable t) {
					Messages.logErr(Db4o.i_config, 4, databaseFileName, t);
					return null;
				}
			}
			if (oc != null) {
				newSession.i_stream = (YapStream) oc;
				add(newSession);
				Platform4.postOpen(oc);
				Messages.logMsg(Db4o.i_config, 5, databaseFileName);
			}
			return oc;
		}
	}
	
	public Object remove(Object obj){
		synchronized(Db4o.lock){
			return super.remove(obj);
		}
	}
	
}