/**************************************************************************
 * AssignItemToSlot
 *
 * $Workfile$
 * $Revision: 1.8 $
 * $Date: 2004/10/21 08:02:19 $
 *
 * Copyright (C) 2001 CERN - European Organization for Nuclear Research
 * All rights reserved.
 **************************************************************************/

package com.c2kernel.lifecycle.instance.predefined;


import com.c2kernel.collection.Collection;
import com.c2kernel.collection.CollectionMember;
import com.c2kernel.collection.MembershipException;
import com.c2kernel.common.InvalidDataException;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.lookup.AgentPath;
import com.c2kernel.persistency.ClusterStorage;
import com.c2kernel.persistency.ClusterStorageException;
import com.c2kernel.process.Gateway;
import com.c2kernel.utils.Logger;

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


    /**
     * Params:
     * 0 - collection name
     * 1 - slot number OR if null:
     * 2 - target entity key
     */
    @Override
	protected String runActivityLogic(AgentPath agent, int itemSysKey,
			int transitionID, String requestData) throws InvalidDataException {

        String collName;
        int slotNo;
        int sysKey = -1;
        Collection<? extends CollectionMember> coll;

        Logger.msg(1, "RemoveSlotFromCollection::request() - Starting.");

        // extract parameters
        try {
            String[] params = getDataList(requestData);
            collName = params[0];
            slotNo = params[1].length()>0?Integer.parseInt(params[1]):-1;
            if (params.length>2) sysKey = params[2].length()>0?Integer.parseInt(params[2]):-1;
        } catch (Exception e) {
            throw new InvalidDataException("Invalid parameters", "");
        }
        
        if (slotNo == -1 && sysKey == -1)
        	throw new InvalidDataException("Must give either slot number or entity key", "");

        // load collection
        try {
			coll = (Collection<? extends CollectionMember>)Gateway.getStorage().get(itemSysKey, ClusterStorage.COLLECTION+"/"+collName, null);
		} catch (ObjectNotFoundException ex) {
			throw new InvalidDataException("Collection '"+collName+"' not found in this Item", "");
		} catch (ClusterStorageException ex) {
			Logger.error(ex);
			throw new InvalidDataException("Error loading collection '\"+collName+\"': "+ex.getMessage(), "");
		}

        if (slotNo == -1) { // find slot from entity key
        	for (CollectionMember member : coll.getMembers().list) {
        		if (member.getSystemKey() == sysKey) {
        			slotNo = member.getID();
        			break;
        		}
            }
        }
        if (slotNo == -1) {
            throw new InvalidDataException("No match", "");
        }
        
        // Remove the slot
        try {
			coll.removeMember(slotNo);
		} catch (MembershipException e) {
			throw new InvalidDataException(e.getMessage(), "");
		}

        // Store the collection
		try {
            Gateway.getStorage().put(itemSysKey, coll, null);
        } catch (ClusterStorageException e) {
            Logger.error(e);
            throw new InvalidDataException("Error storing collection", "");
        }
        Logger.msg(1, "RemoveSlotFromCollection::request() - DONE.");
        return requestData;
        
    }
}