Examples of org.apache.camel.Expression

org.apache.camel.Expression
emq.apache.org/camel/expression.html">expression provides a plugin strategy for evaluating expressions on a message exchange to support things like scripting languages, XQuery or SQL as well as any arbitrary Java expression. @version $Revision: $

        return "simple";
    }


    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);
    }

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        preCreateProcessor();
    }


    @Override
    protected void preCreateProcessor() {
        Expression exp = expression;
        if (expression != null && expression.getExpressionValue() != null) {
            exp = expression.getExpressionValue();
        }


        if (exp instanceof ExpressionClause) {

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     */
    @SuppressWarnings("deprecation")
    protected Resequencer createBatchResequencer(RouteContext routeContext,
                                                 BatchResequencerConfig config) throws Exception {
        Processor processor = this.createChildProcessor(routeContext, true);
        Expression expression = getExpression().createExpression(routeContext);


        ObjectHelper.notNull(config, "config", this);
        ObjectHelper.notNull(expression, "expression", this);


        Resequencer resequencer = new Resequencer(routeContext.getCamelContext(), processor, expression,

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     * @throws Exception can be thrwon
     */
    protected StreamResequencer createStreamResequencer(RouteContext routeContext,
                                                        StreamResequencerConfig config) throws Exception {
        Processor processor = this.createChildProcessor(routeContext, true);
        Expression expression = getExpression().createExpression(routeContext);


        ObjectHelper.notNull(config, "config", this);
        ObjectHelper.notNull(expression, "expression", this);


        ExpressionResultComparator comparator;

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        if (value != null && value instanceof String && StringHelper.hasStartToken((String) value, "simple")) {
            log.warn("Simple expression: {} detected in header: {} of type String. This feature has been removed (see CAMEL-6748).", value, Exchange.FILE_NAME);
        }


        // expression support
        Expression expression = endpoint.getFileName();
        if (value != null && value instanceof Expression) {
            expression = (Expression) value;
        }


        // 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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    }


    @Override
    public Processor createProcessor(RouteContext routeContext) throws Exception {
        Processor childProcessor = routeContext.createProcessor(this);
        Expression processAtExpression = getExpression().createExpression(routeContext);
        return new Delayer(childProcessor, processAtExpression, delay);
    }

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        List<ParameterInfo> bodyParameters = new ArrayList<ParameterInfo>();


        for (int i = 0; i < parameterTypes.length; i++) {
            Class parameterType = parameterTypes[i];
            Annotation[] parameterAnnotations = parametersAnnotations[i];
            Expression expression = createParameterUnmarshalExpression(clazz, method, parameterType,
                                                                       parameterAnnotations);
            if (expression == null) {
                if (parameterTypes.length == 1 && bodyParameters.isEmpty()) {
                    // lets assume its the body
                    expression = ExpressionBuilder.bodyExpression(parameterType);

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    protected Expression createParameterUnmarshalExpression(Class clazz, Method method, Class parameterType,
                                                            Annotation[] parameterAnnotation) {


        // TODO look for a parameter annotation that converts into an expression
        for (Annotation annotation : parameterAnnotation) {
            Expression answer = createParameterUnmarshalExpressionForAnnotation(clazz, method, parameterType,
                                                                                annotation);
            if (answer != null) {
                return answer;
            }
        }

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    protected Expression createParametersExpression() {
        final int size = parameters.size();
        final Expression[] expressions = new Expression[size];
        for (int i = 0; i < size; i++) {
            Expression parameterExpression = parameters.get(i).getExpression();
            expressions[i] = parameterExpression;
        }
        return new Expression<Exchange>() {
            public Object evaluate(Exchange exchange) {
                Object[] answer = new Object[size];

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    public static String func(String s) {
        return "modified" + s;
    }


    protected Object assertExpression(String xpath, String xml, String expected) {
        Expression expression = XPathBuilder.xpath(xpath);
        return assertExpression(expression, xml, expected);
    }

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