package net.sourceforge.fenixedu.presentationTier.renderers.converters;

import net.sourceforge.fenixedu.domain.DomainObject;
import net.sourceforge.fenixedu.domain.RootDomainObject;
import pt.ist.fenixWebFramework.renderers.components.converters.ConversionException;
import pt.ist.fenixWebFramework.renderers.components.converters.Converter;

public class DomainObjectKeyConverter extends Converter {

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

	if (value == null || value.equals("")) {
	    return null;
	}

	String key = (String) value;

	String[] parts = key.split(":");
	if (parts.length < 2) {
	    throw new ConversionException("invalid key format: " + key);
	}

	try {
	    Class keyType = Class.forName(parts[0]);
	    Integer oid = Integer.parseInt(parts[1]);

	    try {
		return RootDomainObject.getInstance().readDomainObjectByOID(keyType, oid);
	    } catch (Exception e) {
		throw new ConversionException("could not get object with given key: " + key, e);
	    }
	} catch (NumberFormatException e) {
	    throw new ConversionException("invalid oid in key: " + key, e);
	} catch (ClassNotFoundException e) {
	    throw new ConversionException("invalid type in key: " + key, e);
	}
    }

    public static String code(String type, String oid) {
	return type + ":" + oid;
    }

    public static String code(String type, Integer oid) {
	return code(type, oid.toString());
    }

    public static String code(Class type, Integer oid) {
	return code(type.getName(), oid.toString());
    }

    public static String code(DomainObject object) {
	return code(object.getClass(), object.getIdInternal());
    }

}