/*
 Wotonomy: OpenStep design patterns for pure Java applications.
 Copyright (C) 2001 Michael Powers

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library 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
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, see http://www.gnu.org
 */
package net.wotonomy.access;

import net.wotonomy.foundation.NSArray;
import net.wotonomy.foundation.NSMutableArray;
import net.wotonomy.foundation.NSNotificationCenter;

/**
*
* @author ezamudio@nasoft.com
* @author $Author: cgruber $
* @version $Revision: 894 $
*/

public abstract class EOAdaptorContext {

	public static final String AdaptorContextBeginTransactionNotification = "AdaptorContextBeginTransaction";
	public static final String AdaptorContextCommitTransactionNotification = "AdaptorContextCommitTransaction";
	public static final String AdaptorContextRollbackTransactionNotification = "AdaptorContextRollbackTransaction";

	protected EOAdaptor _adaptor;
	protected NSMutableArray _channels = new NSMutableArray();
	protected boolean _hasOpenTransaction;

	public EOAdaptorContext(EOAdaptor adaptor) {
		super();
		_adaptor = adaptor;
	}

	public EOAdaptor adaptor() {
		return _adaptor;
	}

	public abstract void beginTransaction();

	public abstract void commitTransaction();

	public abstract void rollbackTransaction();

	public abstract EOAdaptorChannel createAdaptorChannel();

	public abstract void handleDroppedConnection();

	public NSArray channels() {
		return new NSArray(_channels);
	}

	public boolean hasBusyChannels() {
		for (int i = 0; i < _channels.count(); i++) {
			EOAdaptorChannel chan = (EOAdaptorChannel)_channels.objectAtIndex(i);
			if (chan.isFetchInProgress())
				return true;
		}
		return false;
	}

	public boolean hasOpenChannels() {
		for (int i = 0; i < _channels.count(); i++) {
			EOAdaptorChannel chan = (EOAdaptorChannel)_channels.objectAtIndex(i);
			if (chan.isOpen())
				return true;
		}
		return false;
	}

	public boolean hasOpenTransaction() {
		return _hasOpenTransaction;
	}

	public void transactionDidBegin() {
		_hasOpenTransaction = true;
		NSNotificationCenter.defaultCenter().postNotification(
			AdaptorContextBeginTransactionNotification, this);
	}

	public void transactionDidCommit() {
		_hasOpenTransaction = false;
		NSNotificationCenter.defaultCenter().postNotification(
			AdaptorContextCommitTransactionNotification, this);
	}

	public void transactionDidRollback() {
		_hasOpenTransaction = false;
		NSNotificationCenter.defaultCenter().postNotification(
			AdaptorContextRollbackTransactionNotification, this);
	}

}
/*
 * $Log$
 * Revision 1.2  2006/02/16 16:47:14  cgruber
 * Move some classes in to "internal" packages and re-work imports, etc.
 *
 * Also use UnsupportedOperationExceptions where appropriate, instead of WotonomyExceptions.
 *
 * Revision 1.1  2006/02/16 13:19:57  cgruber
 * Check in all sources in eclipse-friendly maven-enabled packages.
 *
 * Revision 1.1  2003/08/13 00:37:45  chochos
 * an almost complete implementation of the abstract adaptor-layer classes
 *
 */