package com.atlassian.plugin.util;
   
   /**
    * Design by contract assertions.
    */
   public class Assertions
   {
       public static <T> T notNull(final String name, final T notNull) throws IllegalArgumentException
       {
          if (notNull == null)
          {
              throw new NullArgumentException(name);
          }
          return notNull;
      }
  
      public static void isTrue(final String name, final boolean check) throws IllegalArgumentException
      {
          if (!check)
          {
              throw new IllegalArgumentException(name);
          }
      }
  
      private Assertions()
      {}
  
      static class NullArgumentException extends IllegalArgumentException
      {
          private static final long serialVersionUID = 6178592463723624585L;
  
          NullArgumentException(final String name)
          {
              super(name + " should not be null!");
          }
      }
  }