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 $

     *
     * @return an expression object which will return the headers, will be <tt>null</tt> if the
     * exchange is not out capable.
     */
    public static Expression outHeadersExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                // only get out headers if the MEP is out capable
                if (ExchangeHelper.isOutCapable(exchange)) {
                    return exchange.getOut().getHeaders();
                } else {

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     *
     * @see Exchange#getException()
     * @return an expression object which will return the exception set on the exchange
     */
    public static Expression exchangeExceptionExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                Exception exception = exchange.getException();
                if (exception == null) {
                    exception = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
                }

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     * @param type the exception type
     * @see Exchange#getException(Class)
     * @return an expression object which will return the exception set on the exchange
     */
    public static Expression exchangeExceptionExpression(final Class<Exception> type) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                Exception exception = exchange.getException(type);
                if (exception == null) {
                    exception = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
                    return ObjectHelper.getException(type, exception);

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     * in a simple OGNL notation
     *
     * @param ognl  methods to invoke on the body in a simple OGNL syntax
     */
    public static Expression exchangeExceptionOgnlExpression(final String ognl) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                Object exception = exchange.getException();
                if (exception == null) {
                    exception = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
                }

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     * Returns an expression for the type converter
     *
     * @return an expression object which will return the type converter
     */
    public static Expression typeConverterExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return exchange.getContext().getTypeConverter();
            }


            @Override

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     * Returns an expression for the {@link org.apache.camel.spi.Registry}
     *
     * @return an expression object which will return the registry
     */
    public static Expression registryExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return exchange.getContext().getRegistry();
            }


            @Override

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     * Returns an expression for lookup a bean in the {@link org.apache.camel.spi.Registry}
     *
     * @return an expression object which will return the bean
     */
    public static Expression refExpression(final String ref) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return exchange.getContext().getRegistry().lookup(ref);
            }


            @Override

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     * Returns an expression for the {@link org.apache.camel.CamelContext}
     *
     * @return an expression object which will return the camel context
     */
    public static Expression camelContextExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return exchange.getContext();
            }


            @Override

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     *
     * @see <tt>Exchange.getException().getMessage()</tt>
     * @return an expression object which will return the exception message set on the exchange
     */
    public static Expression exchangeExceptionMessageExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                Exception exception = exchange.getException();
                if (exception == null) {
                    exception = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
                }

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     * Returns an expression for an exception stacktrace set on the exchange
     *
     * @return an expression object which will return the exception stacktrace set on the exchange
     */
    public static Expression exchangeExceptionStackTraceExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                Exception exception = exchange.getException();
                if (exception == null) {
                    exception = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
                }

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