Examples of org.apache.camel.impl.ExpressionAdapter

org.apache.camel.impl.ExpressionAdapter
A helper class for developers wishing to implement an {@link org.apache.camel.Expression}using Java code with a minimum amount of code to write so that the developer only needs to implement one of the {@link #evaluate(org.apache.camel.Exchange,Class)} or{@link #evaluate(org.apache.camel.Exchange,Class)} methods. @version $Revision: 766032 $

     * <p/>
     * The expression is evaluted as a {@link List} object to allow sorting.
     */
    @SuppressWarnings("unchecked")
    public static Expression sortExpression(final Expression expression, final Comparator comparator) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                List list = expression.evaluate(exchange, List.class);
                Collections.sort(list, comparator);
                return list;
            }

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     * replaceAll to transform the String and return the result
     */
    public static Expression regexReplaceAll(final Expression expression,
                                             final String regex, final String replacement) {
        final Pattern pattern = Pattern.compile(regex);
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                String text = expression.evaluate(exchange, String.class);
                if (text == null) {
                    return null;
                }

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     */
    public static Expression regexReplaceAll(final Expression expression,
                                             final String regex, final Expression replacementExpression) {


        final Pattern pattern = Pattern.compile(regex);
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                String text = expression.evaluate(exchange, String.class);
                String replacement = replacementExpression.evaluate(exchange, String.class);
                if (text == null || replacement == null) {
                    return null;

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    /**
     * Appends the String evaluations of the two expressions together
     */
    public static Expression append(final Expression left, final Expression right) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return left.evaluate(exchange, String.class) + right.evaluate(exchange, String.class);
            }


            @Override

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    /**
     * Prepends the String evaluations of the two expressions together
     */
    public static Expression prepend(final Expression left, final Expression right) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return right.evaluate(exchange, String.class) + left.evaluate(exchange, String.class);
            }


            @Override

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     * @param expressions the expression to be concatenated dynamically
     * @param expression the text description of the expression
     * @return an expression which when evaluated will return the concatenated values
     */
    public static Expression concatExpression(final Collection<Expression> expressions, final String expression) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                StringBuilder buffer = new StringBuilder();
                for (Expression expression : expressions) {
                    String text = expression.evaluate(exchange, String.class);
                    if (text != null) {

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    /**
     * Returns an Expression for the inbound message id
     */
    public static Expression messageIdExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return exchange.getIn().getMessageId();
            }


            @Override

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    /**
     * Returns an Expression for the exchange id
     */
    public static Expression exchangeIdExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return exchange.getExchangeId();
            }


            @Override

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            }
        };
    }


    public static Expression dateExpression(final String command, final String pattern) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                Date date;
                if ("now".equals(command)) {
                    date = new Date();
                } else if (command.startsWith("header.") || command.startsWith("in.header.")) {

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            }
        };
    }


    public static Expression simpleExpression(final String expression) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                // resolve language using context to have a clear separation of packages
                // must call evaluate to return the nested language evaluate when evaluating
                // stacked expressions
                Language language = exchange.getContext().resolveLanguage("simple");

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