package com.github.davidmoten.aws.lw.client.internal.util;
   
   public final class Preconditions {
   
       private Preconditions() {
           // prevent instantiation
       }
   
       public static <T> T checkNotNull(T t) {
          return checkNotNull(t, "argument cannot be null");
      }
  
      public static <T> T checkNotNull(T t, String message) {
          if (t == null) {
              throw new IllegalArgumentException(message);
          }
          return t;
      }
  
      public static void checkArgument(boolean b, String message) {
          if (!b)
              throw new IllegalArgumentException(message);
      }
  
      public static void checkArgument(boolean b) {
          if (!b)
              throw new IllegalArgumentException();
      }
  
  }