/**************************************************************************
 * WriteProperty
 *
 * $Workfile$
 * $Revision: 1.3 $
 * $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 java.util.Arrays;

import com.c2kernel.common.InvalidDataException;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.lookup.AgentPath;
import com.c2kernel.lookup.ItemPath;
import com.c2kernel.persistency.ClusterStorage;
import com.c2kernel.persistency.ClusterStorageException;
import com.c2kernel.process.Gateway;
import com.c2kernel.property.Property;
import com.c2kernel.utils.Logger;

/**************************************************************************
 *
 * @author $Author: abranson $ $Date: 2004/10/21 08:02:19 $
 * @version $Revision: 1.3 $
 **************************************************************************/
public class WriteProperty extends PredefinedStep
{
	/**************************************************************************
    * Constructor for Castror
    **************************************************************************/
    public WriteProperty()
    {
        super();
    }

	//requestdata is xmlstring
    @Override
	protected String runActivityLogic(AgentPath agent, ItemPath item,
			int transitionID, String requestData) throws InvalidDataException {

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

        if (params.length != 2)
            throw new InvalidDataException("WriteProperty: invalid parameters "+Arrays.toString(params), "");
        
        String name = params[0];
        String newValue = params[1];
        
        Property prop;
        
        try {
			prop = (Property)Gateway.getStorage().get(item, ClusterStorage.PROPERTY+"/"+name, null);
			if (!prop.isMutable() && !newValue.equals(prop.getValue()))
				throw new InvalidDataException("WriteProperty: Property '"+name+"' is not mutable.", "");
			prop.setValue(newValue);
			Gateway.getStorage().put(item, prop, null);
		} catch (ObjectNotFoundException e) {
			throw new InvalidDataException("WriteProperty: Property '"+name+"' not found.", "");
		} catch (ClusterStorageException e) {
			throw unknownException(e);
		} 

        return requestData;
    }
}