ClassUtils.java

/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2007, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.jsfunit.analysis.util;

import static junit.framework.Assert.fail;

/**
 * @author Dennis Byrne
 * @since 1.0
 */

public class ClassUtils
{

   public boolean isAssignableFrom(Class[] constraints, Class clazz)
   {

      for (Class constraint : constraints)
         if (constraint.isAssignableFrom(clazz))
            return true;

      return false;
   }

   public Class loadClass(String clazzName, String elementName)
   {

      if (clazzName == null)
         throw new RuntimeException("No class for element '" + elementName + "' (classname null)");

      try
      {

         return getClass().getClassLoader().loadClass(clazzName.trim());

      }
      catch (ClassNotFoundException e)
      {

         try
         {

            return Thread.currentThread().getContextClassLoader().loadClass(clazzName.trim());

         }
         catch (ClassNotFoundException e2)
         {

            fail("Could not load class '" + clazzName + "' for element '" + elementName + "'");
            return null; // this line is unreachable but the compiler does not know this
         }
         catch (NoClassDefFoundError ncdf2)
         {
            fail("Could not load class '" + clazzName + "' for element '" + elementName
                  + "' because of NoClassDefFoundError (" + ncdf2.getMessage() + ")");
            return null; // this line is unreachable but the compiler does not know this
         }

      }
      catch (NoClassDefFoundError ncdf)
      {
         fail("Could not load class '" + clazzName + "' for element '" + elementName
               + "' because of NoClassDefFoundError (" + ncdf.getMessage() + ")");
         return null; // this line is unreachable but the compiler does not know this
      }

   }

   public String getConstraintsList(Class[] constraints)
   {

      String msg = "";

      for (int c = 0; c < constraints.length; c++)
         msg += constraints[c].getName() + ((c == constraints.length - 1 ? "" : " or "));

      return msg;
   }
}