/**
 * This file is part of the CRISTAL-iSE kernel.
 * Copyright (c) 2001-2014 The CRISTAL Consortium. All rights reserved.
 *
 * 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 3 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; with out 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, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * http://www.fsf.org/licensing/licenses/lgpl.html
 */
package org.cristalise.kernel.lifecycle.instance;
import java.util.Vector;

import org.cristalise.kernel.common.AccessRightsException;
import org.cristalise.kernel.common.InvalidDataException;
import org.cristalise.kernel.common.InvalidTransitionException;
import org.cristalise.kernel.common.ObjectAlreadyExistsException;
import org.cristalise.kernel.common.ObjectCannotBeUpdated;
import org.cristalise.kernel.common.ObjectNotFoundException;
import org.cristalise.kernel.common.PersistencyException;
import org.cristalise.kernel.graph.model.Vertex;
import org.cristalise.kernel.graph.traversal.GraphTraversal;
import org.cristalise.kernel.lookup.AgentPath;
import org.cristalise.kernel.lookup.ItemPath;

/**
 * @version $Revision: 1.52 $ $Date: 2005/05/10 15:14:54 $
 * @author $Author: abranson $
 */
public class Join extends WfVertex
{
	public Vector<String> mErrors;
	/**
	 * @see java.lang.Object#Object()
	 */
	public Join()
	{
		super();
		mErrors = new Vector<String>(0, 1);
	}
	private boolean loopTested;
	public int counter = 0;

	/**
	 * @throws InvalidDataException 
	 * @throws ObjectNotFoundException 
	 * @throws AccessRightsException 
	 * @throws InvalidTransitionException 
	 * @throws PersistencyException 
	 * @throws ObjectAlreadyExistsException 
	 * @throws ObjectCannotBeUpdated 
	 * @see org.cristalise.kernel.lifecycle.instance.WfVertex#runNext()
	 */
	@Override
	public void runNext(AgentPath agent, ItemPath item) throws InvalidDataException
	{
		AdvancementCalculator adv = new AdvancementCalculator();
		adv.calculate((CompositeActivity) getParent());
		if (adv.hasprevActive.get(String.valueOf(getID())) == null)
		{
			Vertex[] outVertices = getOutGraphables();
			if (outVertices.length > 0)
			{
				WfVertex nextAct = (WfVertex) outVertices[0];
				nextAct.run(agent, item);
			}
			else
				super.runNext(agent, item);
		}
	}
	/**
	 * Method addNext.
	 *
	 * @param idNext
	 */
	public void addNext(String idNext)
	{
		new Next(this, (WfVertex) getParent().search(idNext));
	}
	/**
	 * @throws InvalidDataException 
	 * @see org.cristalise.kernel.lifecycle.instance.WfVertex#reinit(int)
	 */
	@Override
	public void reinit(int idLoop) throws InvalidDataException
	{
		Vertex[] outVertices = getOutGraphables();
		if (outVertices.length == 1)
		{
			WfVertex nextAct = (WfVertex) outVertices[0];
			nextAct.reinit(idLoop);
		}
	}

	@Override
	public boolean verify()
	{
		mErrors.removeAllElements();
		int nbOutEdges = getOutEdges().length;
		int nbInEdges = getInEdges().length;
		String type = (String) getProperties().get("Type");
		if (nbInEdges < 1)
		{
			mErrors.add("not enough previous");
			return false;
		}
		if (type != null && type.equals("Route"))
		{
			if (nbInEdges > 1)
			{
				mErrors.add("Bad nb of previous");
				return false;
			}
		}
		if (nbOutEdges > 1)
		{
			mErrors.add("too many next");
			return false;
		}
		if (nbOutEdges == 0)
		{
			if (!((CompositeActivity) getParent()).hasGoodNumberOfActivity())
			{
				mErrors.add("too many endpoints");
				return false;
			}
		}
		Vertex[] outV = getOutGraphables();
		Vertex[] anteVertices = GraphTraversal.getTraversal(getParent().getChildrenGraphModel(), this, GraphTraversal.kUp, false);
		boolean loop = false;
		boolean errInLoop = false;
		for (int i = 0; i < outV.length; i++)
		{
			for (int j = 0; j < anteVertices.length; j++)
				if (!loop && outV[i].getID() == anteVertices[j].getID())
				{
					if (outV[i] instanceof Loop)
					{
						loop = true;
						j = anteVertices.length;
						i = outV.length;
					}
					else
					{
						errInLoop = true;
					}
				}
		}
		if (errInLoop && loop)
		{
			mErrors.add("Problem in Loop");
			return false;
		}
		return true;
	}
	/**
	 * @see org.cristalise.kernel.lifecycle.instance.WfVertex#getErrors()
	 */
	@Override
	public String getErrors()
	{
		if (mErrors.size() == 0)
			return "No error";
		else
			return mErrors.elementAt(0);
	}
	/**
	 * @throws InvalidDataException 
	 * @throws ObjectNotFoundException 
	 * @throws AccessRightsException 
	 * @throws InvalidTransitionException 
	 * @throws PersistencyException 
	 * @throws ObjectAlreadyExistsException 
	 * @throws ObjectCannotBeUpdated 
	 * @see org.cristalise.kernel.lifecycle.instance.WfVertex#run()
	 */
	@Override
	public void run(AgentPath agent, ItemPath item) throws InvalidDataException
	{
		runNext(agent, item);
	}
	/**
	 * @see org.cristalise.kernel.lifecycle.instance.WfVertex#addNext(org.cristalise.kernel.lifecycle.instance.WfVertex)
	 */
	@Override
	public Next addNext(WfVertex vertex)
	{
		return new Next(this, vertex);
	}
	/**
	 * @see org.cristalise.kernel.lifecycle.instance.WfVertex#loop()
	 */
	@Override
	public boolean loop()
	{
		boolean loop2 = false;
		if (!loopTested)
		{
			loopTested = true;
			if (getOutGraphables().length != 0)
				loop2 = ((WfVertex) getOutGraphables()[0]).loop();
		}
		else
			loop2 = true;
		loopTested = false;
		return loop2;
	}
	@Override
	public void runFirst(AgentPath agent, ItemPath item) throws InvalidDataException
	{
		runNext(agent, item);
	}
	/*
	 * (non-Javadoc)
	 *
	 * @see org.cristalise.kernel.graph.model.Vertex#isJoin()
	 */
	@Override
	public boolean isJoin()
	{
		return true;
	}
}