if(log.isDebugEnabled()) log.debug("Provider id = " + sb.toString());
	public String getProviderId(List providerIdList) {		StringBuffer sb = new StringBuffer();		for(Iterator iter = providerIdList.iterator(); iter.hasNext();) {			String id = (String)iter.next();			sb.append(id);			if(iter.hasNext()) {				sb.append("+");			}		}		return sb.toString();	}