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Cristal-ise is a description-driven software platform originally developed to track the construction of the CMS ECAL detector of the LHC at CERN. This is its core library, known as the kernel, which manages business objects called Items. Items are entirely configured from data, called descriptions, held in other Items. Every change of a state in an Item is a consequence of an execution of an activity in that Item's lifecycle, meaning that Cristal-ise applications are completely traceable, even in their design. It also supports extensive versioning of Item description data, giving the system a high level of flexibility.

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/**
 * This file is part of the CRISTAL-iSE kernel.
 * Copyright (c) 2001-2015 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.predefined;


import java.util.Arrays;

import org.cristalise.kernel.collection.Aggregation;
import org.cristalise.kernel.collection.AggregationMember;
import org.cristalise.kernel.common.InvalidDataException;
import org.cristalise.kernel.common.ObjectCannotBeUpdated;
import org.cristalise.kernel.common.ObjectNotFoundException;
import org.cristalise.kernel.common.PersistencyException;
import org.cristalise.kernel.lookup.AgentPath;
import org.cristalise.kernel.lookup.ItemPath;
import org.cristalise.kernel.persistency.ClusterStorage;
import org.cristalise.kernel.process.Gateway;
import org.cristalise.kernel.utils.Logger;


/**************************************************************************
 *
 * @author $Author: abranson $ $Date: 2004/10/21 08:02:19 $
 * @version $Revision: 1.8 $
 **************************************************************************/
public class ClearSlot extends PredefinedStep
{
    /**************************************************************************
    * Constructor for Castor
    **************************************************************************/
    public ClearSlot()
    {
        super();
    }


    /**
     * Params:
     * 0 - collection name
     * 1 - slot number
     * @throws ObjectNotFoundException 
     * @throws PersistencyException 
     * @throws ObjectCannotBeUpdated 
     */
    @Override
	protected String runActivityLogic(AgentPath agent, ItemPath item,
			int transitionID, String requestData, Object locker) throws InvalidDataException, ObjectNotFoundException, PersistencyException, ObjectCannotBeUpdated {
    	
        String collName;
        int slotNo;
        Aggregation agg;

        // extract parameters
        String[] params = getDataList(requestData);
        if (Logger.doLog(3)) Logger.msg(3, "ClearSlot: called by "+agent+" on "+item+" with parameters "+Arrays.toString(params));

        try {
            collName = params[0];
            slotNo = Integer.parseInt(params[1]);
        } catch (Exception e) {
            throw new InvalidDataException("ClearSlot: Invalid parameters "+Arrays.toString(params));
        }

        // load collection
        try {
            agg = (Aggregation)Gateway.getStorage().get(item, ClusterStorage.COLLECTION+"/"+collName+"/last", locker);
		} catch (PersistencyException ex) {
			Logger.error(ex);
			throw new PersistencyException("ClearSlot: Error loading collection '"+collName+"': "+ex.getMessage());
		}

        // find member and clear
        boolean stored = false;
        for (AggregationMember member : agg.getMembers().list) {
            if (member.getID() == slotNo) {
                if (member.getItemPath() == null)
                    throw new ObjectCannotBeUpdated("ClearSlot: Member slot "+slotNo+" already empty");
                member.clearItem();
                stored = true;
                break;
            }
        }
        if (!stored) {
            throw new ObjectNotFoundException("ClearSlot: Member slot "+slotNo+" not found.");
        }


		try {
            Gateway.getStorage().put(item, agg, locker);
        } catch (PersistencyException e) {
            Logger.error(e);
            throw new PersistencyException("ClearSlot: Error storing collection");
        }
        return requestData;
    }
}