Examples of org.mule.api.expression.ExpressionEvaluator

org.mule.api.expression.ExpressionEvaluator
ExpressionEvaluator extracts a property from the message in a generic way. i.e. composite properties can be pulled and aggregated depending on this strategy. This can be used to extract Correlation Ids, Message Ids etc. These objects are used to execute property expressions (usually on the current message) at runtime to extracta dynamic value.

            return bean;
        }


        if (bean instanceof ExpressionEvaluator)
        {
            ExpressionEvaluator ee = (ExpressionEvaluator) bean;


            final ExpressionManager expressionManager = muleContext.getExpressionManager();
            if (!expressionManager.isEvaluatorRegistered(ee.getName()))
            {
                expressionManager.registerEvaluator(ee);
            }
        }
        return bean;

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        if (name == null)
        {
            return null;
        }


        ExpressionEvaluator evaluator = (ExpressionEvaluator) evaluators.remove(name);
        if (evaluator instanceof Disposable)
        {
            ((Disposable) evaluator).dispose();
        }
        return evaluator;

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     * @throws ExpressionRuntimeException if the expression is invalid, or a null is found for the expression and
     *                                    'failIfNull is set to true.
     */
    public Object evaluate(String expression, String evaluator, MuleMessage message, boolean failIfNull) throws ExpressionRuntimeException
    {
        ExpressionEvaluator extractor = (ExpressionEvaluator) evaluators.get(evaluator);
        if (extractor == null)
        {
            throw new IllegalArgumentException(CoreMessages.expressionEvaluatorNotRegistered(evaluator).getMessage());
        }
        Object result = extractor.evaluate(expression, message);
        //TODO Handle empty collections || (result instanceof Collection && ((Collection)result).size()==0)
        if (failIfNull && (result == null))
        {
            throw new RequiredValueException(CoreMessages.expressionEvaluatorReturnedNull(evaluator, expression));
        }

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     */
    public synchronized void clearEvaluators()
    {
        for (Iterator iterator = evaluators.values().iterator(); iterator.hasNext();)
        {
            ExpressionEvaluator evaluator = (ExpressionEvaluator) iterator.next();
            if (evaluator instanceof Disposable)
            {
                ((Disposable) evaluator).dispose();
            }
        }

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    }


    public void testCustomConfig() throws Exception
    {
        muleContext.getExpressionManager().registerEvaluator(new ExpressionEvaluator()
        {
            public Object evaluate(String expression, MuleMessage message) { return null;  }


            public void setName(String name) { }

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        if (name == null)
        {
            return null;
        }


        ExpressionEvaluator evaluator = (ExpressionEvaluator) evaluators.remove(name);
        if (evaluator instanceof Disposable)
        {
            ((Disposable) evaluator).dispose();
        }
        return evaluator;

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    {
        if (evaluator == null)
        {
            return expressionLanguage.evaluate(expression, message);
        }
        ExpressionEvaluator extractor = (ExpressionEvaluator) evaluators.get(evaluator);
        if (extractor == null)
        {
            throw new IllegalArgumentException(CoreMessages.expressionEvaluatorNotRegistered(evaluator)
                .getMessage());
        }
        Object result = extractor.evaluate(expression, message);
        // TODO Handle empty collections || (result instanceof Collection && ((Collection)result).size()==0)
        if (failIfNull && (result == null))
        {
            throw new RequiredValueException(CoreMessages.expressionEvaluatorReturnedNull(evaluator,
                expression));

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     */
    public synchronized void clearEvaluators()
    {
        for (Iterator iterator = evaluators.values().iterator(); iterator.hasNext();)
        {
            ExpressionEvaluator evaluator = (ExpressionEvaluator) iterator.next();
            if (evaluator instanceof Disposable)
            {
                ((Disposable) evaluator).dispose();
            }
        }

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            return bean;
        }


        if (bean instanceof ExpressionEvaluator)
        {
            ExpressionEvaluator ee = (ExpressionEvaluator) bean;


            final ExpressionManager expressionManager = muleContext.getExpressionManager();
            if (!expressionManager.isEvaluatorRegistered(ee.getName()))
            {
                expressionManager.registerEvaluator(ee);
            }
        }
        return bean;

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    }


    @Test
    public void testCustomConfig() throws Exception
    {
        expressionManager.registerEvaluator(new ExpressionEvaluator()
        {
            public Object evaluate(String expression, MuleMessage message)
            {
                return null;
            }

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Related Classes of org.mule.api.expression.ExpressionEvaluator

org.mule.config.spring.ExpressionEvaluatorPostProcessor

org.mule.expression.DefaultExpressionManager

org.mule.expression.ExpressionConfigTestCase

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