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 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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    protected void assertExpressionResultInstanceOf(String expressionText, Class<?> expectedType) {
        Language language = assertResolveLanguage(getLanguageName());
        Expression expression = language.createExpression(expressionText);
        assertNotNull("Cannot assert type when no type is provided", expectedType);
        assertNotNull("No Expression could be created for text: " + expressionText + " language: " + language, expression);
        Object answer = expression.evaluate(exchange, Object.class);
        assertIsInstanceOf(expectedType, answer);
    }


    public static final class Animal {
        private String name;

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        // evaluate the name as a String from the value
        String name;
        if (expression != null) {
            log.trace("Filename evaluated as expression: {}", expression);
            name = expression.evaluate(exchange, String.class);
        } else {
            name = exchange.getContext().getTypeConverter().convertTo(String.class, exchange, value);
        }


        // flatten name

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        Exchange exchange = new DefaultExchange(context);
        exchange.getIn().setBody(new File("src/test/resources/books.json"));


        Language lan = context.resolveLanguage("jsonpath");
        Expression exp = lan.createExpression("$.store.book[*].author");
        List<?> authors = exp.evaluate(exchange, List.class);
        log.info("Authors {}", authors);


        assertNotNull(authors);
        assertEquals(2, authors.size());
        assertEquals("Nigel Rees", authors.get(0));

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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);
                        // use "null" to indicate the expression returned a null value which is a valid response we need to honor
                        if (parameterValue == null) {
                            parameterValue = "null";
                        }
                    } catch (Exception 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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    protected CamelContext context = new DefaultCamelContext();
    protected Exchange exchange;


    public void testExpression() throws Exception {
        Expression expression = sql("SELECT * FROM org.apache.camel.builder.sql.Person where city = 'London'");
        Object value = expression.evaluate(exchange);
        assertIsInstanceOf(List.class, value);


        List list = (List)value;
        assertEquals("List size", 2, list.size());

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        }
    }


    public void testExpressionWithHeaderVariable() throws Exception {
        Expression expression = sql("SELECT * FROM org.apache.camel.builder.sql.Person where name = :fooHeader");
        Object value = expression.evaluate(exchange);
        assertIsInstanceOf(List.class, value);


        List<Person> list = (List<Person>)value;
        assertEquals("List size", 1, list.size());

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        predicate = SimpleLanguage.predicate("${header.bar} == 124");
        assertFalse(predicate.matches(exchange));


        Expression expression = SimpleLanguage.expression("${body}");
        assertEquals("<hello id='m123'>world!</hello>", expression.evaluate(exchange, String.class));


        expression = SimpleLanguage.simple("${body}");
        assertEquals("<hello id='m123'>world!</hello>", expression.evaluate(exchange, String.class));
        expression = SimpleLanguage.simple("${body}", String.class);
        assertEquals("<hello id='m123'>world!</hello>", expression.evaluate(exchange, String.class));

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        Expression expression = SimpleLanguage.expression("${body}");
        assertEquals("<hello id='m123'>world!</hello>", expression.evaluate(exchange, String.class));


        expression = SimpleLanguage.simple("${body}");
        assertEquals("<hello id='m123'>world!</hello>", expression.evaluate(exchange, String.class));
        expression = SimpleLanguage.simple("${body}", String.class);
        assertEquals("<hello id='m123'>world!</hello>", expression.evaluate(exchange, String.class));


        expression = SimpleLanguage.simple("${header.bar} == 123", boolean.class);
        assertEquals(Boolean.TRUE, expression.evaluate(exchange, Object.class));

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