package org.junit.rules;
   
   import org.junit.runner.Description;
   import org.junit.runners.model.Statement;
   
   /**
    * Runs a collection of rules on a statement.
    *
    * @since 4.9
   */
  public class RunRules extends Statement {
      private final Statement statement;
  
      public RunRules(Statement base, Iterable<TestRule> rules, Description description) {
          statement = applyAll(base, rules, description);
      }
  
      @Override
      public void evaluate() throws Throwable {
          statement.evaluate();
      }
  
      private static Statement applyAll(Statement result, Iterable<TestRule> rules,
              Description description) {
          for (TestRule each : rules) {
              result = each.apply(result, description);
          }
          return result;
      }
  }