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package org.unidal.dal.jdbc;

import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.List;

public class BizObjectHelper {
   @SuppressWarnings("unchecked")
   private static  Constructor getBoConstructor(Class boClass) {
      try {
         Constructor[] cs = (Constructor[]) boClass.getConstructors();

         for (int i = 0; i < cs.length; i++) {
            Class[] paramTypes = cs[i].getParameterTypes();

            if (paramTypes.length == 1 && DataObject.class.isAssignableFrom(paramTypes[0])) {
               return cs[i];
            }
         }
      } catch (Exception e) {
         // ignore it
      }

      throw new RuntimeException("Can't find a constructor for creating a BO instance from " + boClass);
   }

   public static  List unwrap(List bos, Class doClass) {
      List dos = new ArrayList(bos.size());

      for (T bo : bos) {
         dos.add(unwrap(bo, doClass));
      }

      return dos;
   }

   @SuppressWarnings("unchecked")
   public static  S unwrap(T bo, Class doClass) {
      return (S) bo.getDo();
   }

   public static  List wrap(List rows, Class boClass) {
      List bos = new ArrayList(rows.size());

      for (S row : rows) {
         bos.add(wrap(row, boClass));
      }

      return bos;
   }

   public static  T wrap(S row, Class boClass) {
      try {
         Constructor c = getBoConstructor(boClass);

         return c.newInstance(new Object[] { row });
      } catch (Exception e) {
         throw new RuntimeException("Can't create a BO instance from " + boClass, e);
      }
   }
}