Examples of 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 $
org.apache.camel.support.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)} methods. @version

Examples of org.apache.camel.support.ExpressionAdapter

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


            @Override

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Examples of org.apache.camel.support.ExpressionAdapter

     * Returns an expression for the properties of exchange
     *
     * @return an expression object which will return the properties
     */
    public static Expression propertiesExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return exchange.getProperties();
            }


            @Override

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Examples of org.apache.camel.support.ExpressionAdapter

     * Returns an expression for the properties of the camel context
     *
     * @return an expression object which will return the properties
     */
    public static Expression camelContextPropertiesExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                return exchange.getContext().getProperties();
            }


            @Override

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Examples of org.apache.camel.support.ExpressionAdapter

     *
     * @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().getProperty(propertyName);
            }


            @Override

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Examples of org.apache.camel.support.ExpressionAdapter

     * @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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Examples of org.apache.camel.support.ExpressionAdapter

     * @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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Examples of org.apache.camel.support.ExpressionAdapter

     *
     * @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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Examples of org.apache.camel.support.ExpressionAdapter

     *
     * @param expression  the expression or predicate
     * @return an expression object which will evaluate the expression/predicate using the given language
     */
    public static Expression languageExpression(final String language, final String expression) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                Language lan = exchange.getContext().resolveLanguage(language);
                if (lan != null) {
                    return lan.createExpression(expression).evaluate(exchange, Object.class);
                } else {

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Examples of org.apache.camel.support.ExpressionAdapter

     *
     * @param name the type name
     * @return an expression object which will return the type value
     */
    public static Expression typeExpression(final String name) {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                // it may refer to a class type
                Class<?> type = exchange.getContext().getClassResolver().resolveClass(name);
                if (type != null) {
                    return type;

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Examples of org.apache.camel.support.ExpressionAdapter

     *
     * @param expression  the target expression to cache
     * @return the cached value
     */
    public static Expression cacheExpression(final Expression expression) {
        return new ExpressionAdapter() {
            private final AtomicReference<Object> cache = new AtomicReference<Object>();


            public Object evaluate(Exchange exchange) {
                Object answer = cache.get();
                if (answer == null) {

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