Package org.apache.commons.jexl

Examples of org.apache.commons.jexl.Expression

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        List l = new ArrayList();
        l.add("Hello from location 0");
        l.add(new Integer(2));
        jc.getVars().put("array", l);

        Expression e = ExpressionFactory.createExpression("array[1]");
        Object o = e.evaluate(jc);
        System.out.println("Object @ location 1 = " + o);

        e = ExpressionFactory.createExpression("array[0].length()");
        o = e.evaluate(jc);

        System.out.println("The length of the string at location 0 is : " + o);
    }
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        jc.getVars().put("number", new Integer(10));

        /*
         *  access a method w/o args
         */
        Expression e = ExpressionFactory.createExpression("foo.getFoo()");
        Object o = e.evaluate(jc);
        System.out.println("value returned by the method getFoo() is : " + o);

        /*
         *  access a method w/ args
         */
        e = ExpressionFactory.createExpression("foo.convert(1)");
        o = e.evaluate(jc);
        System.out.println("value of " + e.getExpression() + " is : " + o);

        e = ExpressionFactory.createExpression("foo.convert(1+7)");
        o = e.evaluate(jc);
        System.out.println("value of " + e.getExpression() + " is : " + o);

        e = ExpressionFactory.createExpression("foo.convert(1+number)");
        o = e.evaluate(jc);
        System.out.println("value of " + e.getExpression() + " is : " + o);

        /*
         * access a property
         */
        e = ExpressionFactory.createExpression("foo.bar");
        o = e.evaluate(jc);
        System.out.println("value returned for the property 'bar' is : " + o);

    }
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    private FlatResolver resolver = new FlatResolver(true);

    protected Expression createExpression(final String expression) throws Exception {
        // assert expression != null;

        Expression expr = ExpressionFactory.createExpression(expression);
        expr.addPreResolver(resolver);

        return expr;
    }
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        boolean trace = log.isTraceEnabled();
        if (trace) {
            log.trace("Evaluating expression: " + expression);
        }

        Expression expr = createExpression(expression);
        Object obj = expr.evaluate(context);
        if (trace) {
            log.trace("Result: " + obj);
        }

        return obj;
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        if (debug) {
            log.debug("Evaluating expression: " + expression);
        }

        Expression expr = ExpressionFactory.createExpression(expression);

        JexlContext ctx = JexlHelper.createContext();
        ctx.setVars(vars);

        Object result = expr.evaluate(ctx);
        if (debug) {
            log.debug("Result: " + result);
        }

        return result;
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        ReflectionUtils.doWithMethods(obj.getClass(), new ReflectionUtils.MethodCallback() {
            @SuppressWarnings("unchecked")
            public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException {
                if (method.getAnnotation(Callback.class) != null) {
                    try {
                        Expression e = ExpressionFactory.createExpression(
                                method.getAnnotation(Callback.class).condition());
                        JexlContext jc = JexlHelper.createContext();
                        jc.getVars().put("this", obj);
                        Object r = e.evaluate(jc);
                        if (!(r instanceof Boolean)) {
                            throw new RuntimeException("Expression did not returned a boolean value but: " + r);
                        }
                        Boolean oldVal = req.getCallbacks().get(method);
                        Boolean newVal = (Boolean) r;
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    private Object doEvaluate(final String expression) throws Exception {
        assert expression != null;

        log.debug("Evaluating expression: {}", expression);
       
        Expression expr = ExpressionFactory.createExpression(expression);

        JexlContext ctx = JexlHelper.createContext();
        ctx.setVars(vars);

        Object result = expr.evaluate(ctx);
        log.debug("Result: {}", result);

        return result;
    }   
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    private FlatResolver resolver = new FlatResolver(true);

    protected Expression createExpression(final String expression) throws Exception {
        // assert expression != null;

        Expression expr = ExpressionFactory.createExpression(expression);
        expr.addPreResolver(resolver);

        return expr;
    }
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            throw new IllegalArgumentException("expression");
        }

        log.trace("Evaluating expression: {}", expression);

        Expression expr = createExpression(expression);
        Object obj = expr.evaluate(context);
        log.trace("Result: {}", obj);

        return obj;
    }
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    Integer b = Integer.valueOf (8);
    JexlContext jc = JexlHelper.createContext();
    jc.getVars().put("a", a);
    jc.getVars().put("b", b);
    try {
      Expression e = ExpressionFactory.createExpression("a+b");
      Object o = e.evaluate(jc);
      assertEquals(o, Long.valueOf(13));
      System.out.println("JEXL library test ok");
    } catch (Exception e) {
      e.printStackTrace();
      throw (e);
    }
  }
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