Examples of org.apache.camel.Expression.evaluate()

org.apache.camel.Expression.evaluate()
Returns the value of the expression on the given exchange @param exchange the message exchange on which to evaluate the expression @return the value of the expression

    public void testSimpleUnaryIncInt() throws Exception {
        exchange.getIn().setBody(122);
        SimpleExpressionParser parser = new SimpleExpressionParser("${body}++");
        Expression exp = parser.parseExpression();


        assertEquals(Integer.valueOf(123), exp.evaluate(exchange, Integer.class));
    }


    public void testSimpleUnaryDecInt() throws Exception {
        exchange.getIn().setBody(122);
        SimpleExpressionParser parser = new SimpleExpressionParser("${body}--");

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    public void testSimpleUnaryDecInt() throws Exception {
        exchange.getIn().setBody(122);
        SimpleExpressionParser parser = new SimpleExpressionParser("${body}--");
        Expression exp = parser.parseExpression();


        assertEquals(Integer.valueOf(121), exp.evaluate(exchange, Integer.class));
    }


    public void testHeaderNestedFunction() throws Exception {
        exchange.getIn().setBody("foo");
        exchange.getIn().setHeader("foo", "abc");

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        exchange.getIn().setBody("foo");
        exchange.getIn().setHeader("foo", "abc");
        SimpleExpressionParser parser = new SimpleExpressionParser("${header.${body}}");
        Expression exp = parser.parseExpression();


        Object obj = exp.evaluate(exchange, Object.class);
        assertNotNull(obj);
        assertEquals("abc", obj);
    }


    public void testBodyAsNestedFunction() throws Exception {

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        exchange.getIn().setBody("123");
        exchange.getIn().setHeader("foo", "Integer");
        SimpleExpressionParser parser = new SimpleExpressionParser("${bodyAs(${header.foo})}");
        Expression exp = parser.parseExpression();


        Object obj = exp.evaluate(exchange, Object.class);
        assertNotNull(obj);
        Integer num = assertIsInstanceOf(Integer.class, obj);
        assertEquals(123, num.intValue());
    }

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        exchange.getIn().setHeader("bar", "e");
        exchange.getIn().setHeader("baz", "ger");
        SimpleExpressionParser parser = new SimpleExpressionParser("${bodyAs(${header.foo}${header.bar}${header.baz})}");
        Expression exp = parser.parseExpression();


        Object obj = exp.evaluate(exchange, Object.class);
        assertNotNull(obj);
        Integer num = assertIsInstanceOf(Integer.class, obj);
        assertEquals(123, num.intValue());
    }

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        exchange.getIn().setHeader("foo", "Integer");
        exchange.getIn().setHeader("bar", "foo");
        SimpleExpressionParser parser = new SimpleExpressionParser("${bodyAs(${header.${header.bar}})}");
        Expression exp = parser.parseExpression();


        Object obj = exp.evaluate(exchange, Object.class);
        assertNotNull(obj);
        Integer num = assertIsInstanceOf(Integer.class, obj);
        assertEquals(123, num.intValue());
    }

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                    // use simple language to evaluate the expression, as it may use the simple language to refer to message body, headers etc.
                    Expression expression = null;
                    try {
                        expression = exchange.getContext().resolveLanguage("simple").createExpression(exp);
                        parameterValue = expression.evaluate(exchange, Object.class);
                    } catch (Exception e) {
                        throw new ExpressionEvaluationException(expression, "Cannot create/evaluate simple expression: " + exp
                                + " to be bound to parameter at index: " + index + " on method: " + getMethod(), exchange, e);
                    }

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             */
            private Object evaluateParameterBinding(Exchange exchange, Expression expression, int index, Class<?> parameterType) {
                Object answer = null;


                // use object first to avoid type conversion so we know if there is a value or not
                Object result = expression.evaluate(exchange, Object.class);
                if (result != null) {
                    // we got a value now try to convert it to the expected type
                    try {
                        answer = exchange.getContext().getTypeConverter().mandatoryConvertTo(parameterType, result);
                        if (LOG.isTraceEnabled()) {

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                        Object value = list.get(0);
                        if (value != null) {
                            String text = exchange.get().getContext().getTypeConverter().convertTo(String.class, value);
                            Language simple = exchange.get().getContext().resolveLanguage("simple");
                            Expression exp = simple.createExpression(text);
                            Object answer = exp.evaluate(exchange.get(), Object.class);
                            return answer;
                        }
                    }
                    return null;
                }

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    public void testBodyExpressionNotStringType() throws Exception {
        exchange.getIn().setBody(123);
        Expression exp = SimpleLanguage.simple("${body}");
        assertNotNull(exp);
        Object val = exp.evaluate(exchange, Object.class);
        assertIsInstanceOf(Integer.class, val);
        assertEquals(123, val);
    }


    public void testSimpleExpressions() throws Exception {

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