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!");
          }
      }
  }