Examples of org.codehaus.janino.ExpressionEvaluator

org.codehaus.janino.ExpressionEvaluator
ession to evaluate Foo.class, // interface that describes the expression's signature new String[] { "a", "b" }, // the parameters' names (ClassLoader) null // Use current thread's context class loader ); System.out.println("1 + 2 = " + f.bar(1, 2)); // Evaluate the expression Notice: The interfaceToImplement must either be declared public, or with package scope in the root package (i.e. "no" package).
On my system (Intel P4, 2 GHz, MS Windows XP, JDK 1.4.1), expression "x + 1" evaluates as follows:

Server JVM Client JVM

Normal EE 23.7 ns 64.0 ns

Fast EE 31.2 ns 42.2 ns

(How can it be that interface method invocation is slower than reflection for the server JVM?)

	Server JVM	Client JVM
Normal EE	23.7 ns	64.0 ns
Fast EE	31.2 ns	42.2 ns

  @Override
  public void start() {
    try {
      assert context != null;
      ClassLoader cl = context.getClass().getClassLoader();
      ee = new ExpressionEvaluator(getDecoratedExpression(), EXPRESSION_TYPE,
          getParameterNames(), getParameterTypes(), THROWN_EXCEPTIONS, cl);
      super.start();
    } catch (Exception e) {
      addError(
          "Could not start evaluator with expression [" + expression + "]", e);

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                  + " - null value passed as argument, cannot detect class so using Object.class");
          parameterTypes[i] = Object.class;
        }
        i++;
      }
      expressionEvaluator = new ExpressionEvaluator(expression,
          expressionType, parameterNames, parameterTypes);
    }
  }

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        init(RestxMainRouterFactory.newInstance(serverId, baseUri));
    }


    @SuppressWarnings("unchecked")
    protected Collection<String> getMappings(ServletConfig config) throws CompileException, InvocationTargetException {
        ExpressionEvaluator expressionEvaluator = new ExpressionEvaluator(
                "config.getServletContext().getServletRegistration(config.getServletName()).getMappings()",
                Collection.class,
                new String[]{"config"},
                new Class[]{ServletConfig.class});
        return (Collection<String>) expressionEvaluator.evaluate(new Object[]{config});
    }

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