package pt.ist.renderers.extensions.converters;

import pt.ist.fenixframework.DomainObject;
import pt.ist.fenixframework.pstm.Transaction;
import pt.ist.renderers.components.converters.ConversionException;
import pt.ist.renderers.components.converters.Converter;

public class DomainObjectKeyConverter extends Converter {
    public static final String NULL_VALUE_MARKER = "NULL_VALUE_MARKER";

    @Override
    public Object convert(Class type, Object value) {

	if (value == null || value.equals("") || value.equals(NULL_VALUE_MARKER)) {
	    return null;
	}
	int index = ((String) value).indexOf(":");

	final String key = index > 0 ? ((String) value).substring(index + 1) : (String) value;
	try {
	    final long oid = Long.parseLong(key);
	    return Transaction.getObjectForOID(oid);
	} catch (NumberFormatException e) {
	    throw new ConversionException("invalid oid in key: " + key, e);
	}
    }

    public static String code(final DomainObject object) {
	return Long.toString(object.getOID());
    }

}