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 $

     *
     * @param propertyName the name of the property the expression will return
     * @return an expression object which will return the property value
     */
    public static Expression camelContextPropertyExpression(final String propertyName) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return exchange.getContext().getProperties().get(propertyName);
            }


            @Override

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     * @param defaultValue default value to return if no system property exists
     * @return an expression object which will return the system property value
     */
    public static Expression systemPropertyExpression(final String propertyName,
                                                      final String defaultValue) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return System.getProperty(propertyName, defaultValue);
            }


            @Override

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     * @param defaultValue default value to return if no system environment exists
     * @return an expression object which will return the system environment value
     */
    public static Expression systemEnvironmentExpression(final String propertyName,
                                                         final String defaultValue) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                String answer = System.getenv(propertyName);
                if (answer == null) {
                    answer = defaultValue;
                }

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     *
     * @param value the value the expression will return
     * @return an expression object which will return the constant value
     */
    public static Expression constantExpression(final Object value) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return value;
            }


            @Override

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    /**
     * Returns the expression for the exchanges inbound message body
     */
    public static Expression bodyExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return exchange.getIn().getBody();
            }


            @Override

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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 bodyOgnlExpression(final String ognl) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                Object body = exchange.getIn().getBody();
                if (body == null) {
                    return null;
                }

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    /**
     * Returns the expression for the exchanges inbound message body converted
     * to the given type
     */
    public static <T> Expression bodyExpression(final Class<T> type) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return exchange.getIn().getBody(type);
            }


            @Override

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    /**
     * Returns the expression for the exchanges inbound message body converted
     * to the given type
     */
    public static Expression bodyExpression(final String name) {
        return new ExpressionAdapter() {
            @SuppressWarnings("unchecked")
            public Object evaluate(Exchange exchange) {
                Class type;
                try {
                    type = exchange.getContext().getClassResolver().resolveMandatoryClass(name);

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    /**
     * Returns the expression for the current thread name
     */
    public static Expression threadNameExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return Thread.currentThread().getName();
            }


            @Override

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     * @param type the type
     * @param nullBodyAllowed whether null bodies is allowed and if so a null is returned,
     *                        otherwise an exception is thrown
     */
    public static <T> Expression mandatoryBodyExpression(final Class<T> type, final boolean nullBodyAllowed) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                if (nullBodyAllowed) {
                    if (exchange.getIn().getBody() == null) {
                        return null;
                    }

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