Examples of org.mule.expression.transformers.ExpressionTransformer

Package org.mule.expression.transformers

Examples of org.mule.expression.transformers.ExpressionTransformer

org.mule.expression.transformers.ExpressionTransformer
This transformer will evaluate one or more expressions on the current message and return the results as an Array. If only one expression is defined it will return the object returned from the expression.
You can use expressions to extract
- headers (single, map or list)
- attachments (single, map or list)
- payload
- xpath
- groovy
- bean
and more.
This transformer provides a very powerful way to pull different bits of information from the message and pass them to the service.

        expressionConfig.parse(expression);


        final ExpressionArgument expressionArgument = new ExpressionArgument(name, expressionConfig, false);
        expressionArgument.setMuleContext(muleContext);


        final ExpressionTransformer expressionTransformer = new ExpressionTransformer();
        expressionTransformer.setMuleContext(muleContext);
        expressionTransformer.addArgument(expressionArgument);


        try
        {
            expressionTransformer.initialise();
        }
        catch (final InitialisationException ie)
        {
            throw new MuleRuntimeException(ie);
        }

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        expressionConfig.parse(expression);


        final ExpressionArgument expressionArgument = new ExpressionArgument(name, expressionConfig, false);
        expressionArgument.setMuleContext(muleContext);


        final ExpressionTransformer expressionTransformer = new ExpressionTransformer();
        expressionTransformer.setMuleContext(muleContext);
        expressionTransformer.addArgument(expressionArgument);


        try
        {
            expressionTransformer.initialise();
        }
        catch (final InitialisationException ie)
        {
            throw new MuleRuntimeException(ie);
        }

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        return "org/mule/test/transformers/expression-transformers-el-test.xml";
    }


    private void testTransformerConfig(String name) throws Exception
    {
        ExpressionTransformer transformer = (ExpressionTransformer) muleContext.getRegistry()
            .lookupTransformer(name);
        assertNotNull(transformer);
        assertNotNull(transformer.getArguments());
        assertEquals(2, transformer.getArguments().size());
        ExpressionArgument arg1 = transformer.getArguments().get(0);
        assertNull(arg1.getEvaluator());
        assertEquals("message.payloadAs(org.mule.tck.testmodels.fruit.FruitBasket)", arg1.getExpression());
        assertFalse(arg1.isOptional());


        ExpressionArgument arg2 = transformer.getArguments().get(1);
        assertEquals("headers", arg2.getEvaluator());
        assertEquals("foo,bar?", arg2.getExpression());
        assertTrue(arg2.isOptional());
    }

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        testExecutionWithCorrectMessage("testTransformer");
    }


    private void testExecutionWithCorrectMessage(String name) throws Exception
    {
        ExpressionTransformer transformer = (ExpressionTransformer) muleContext.getRegistry()
            .lookupTransformer(name);
        Map<String, Object> props = new HashMap<String, Object>();
        props.put("foo", "moo");
        props.put("bar", "mar");


        MuleMessage message = new DefaultMuleMessage(new FruitBowl(new Apple(), new Banana()), props,
            muleContext);


        Object result = transformer.transform(message);
        assertNotNull(result);
        assertTrue(result.getClass().isArray());
        Object o1 = ((Object[]) result)[0];
        assertTrue(o1 instanceof FruitBasket);

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    }


    @Test
    public void testExecutionWithPartialMissingOptionalParams() throws Exception
    {
        ExpressionTransformer transformer = (ExpressionTransformer) muleContext.getRegistry()
            .lookupTransformer("testTransformer");
        Map<String, Object> props = new HashMap<String, Object>();
        props.put("foo", "moo");


        MuleMessage message = new DefaultMuleMessage(new FruitBowl(new Apple(), new Banana()), props,
            muleContext);


        Object result = transformer.transform(message);
        assertNotNull(result);
        assertTrue(result.getClass().isArray());
        Object o1 = ((Object[]) result)[0];
        assertTrue(o1 instanceof FruitBasket);

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    }


    @Test
    public void testExecutionWithAllMissingOptionalParams() throws Exception
    {
        ExpressionTransformer transformer = (ExpressionTransformer) muleContext.getRegistry()
            .lookupTransformer("testTransformer");


        MuleMessage message = new DefaultMuleMessage(new FruitBowl(new Apple(), new Banana()), muleContext);


        Object result = transformer.transform(message);
        assertNotNull(result);
        assertTrue(result.getClass().isArray());
        Object o1 = ((Object[]) result)[0];
        assertTrue(o1 instanceof FruitBasket);

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    }


    @Test
    public void testTransformerConfigWithSingleArgument() throws Exception
    {
        ExpressionTransformer transformer = (ExpressionTransformer) muleContext.getRegistry()
            .lookupTransformer("testTransformer2");
        Map<String, Object> props = new HashMap<String, Object>();
        props.put("foo", "moo");
        props.put("bar", "mar");


        MuleMessage message = new DefaultMuleMessage(new FruitBowl(new Apple(), new Banana()), props,
            muleContext);


        Object result = transformer.transform(message);
        assertNotNull(result);
        assertFalse(result.getClass().isArray());
        assertTrue(result instanceof List<?>);
        List<?> list = (List<?>) result;
        assertTrue(list.contains("moo"));

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        testTransformerConfigWithSingleArgumentShortcutConfig("testTransformer4");
    }


    private void testTransformerConfigWithSingleArgumentShortcutConfig(String name) throws Exception
    {
        ExpressionTransformer transformer = (ExpressionTransformer) muleContext.getRegistry()
            .lookupTransformer(name);
        Map<String, Object> props = new HashMap<String, Object>();
        props.put("foo", "moo");
        props.put("bar", "mar");


        MuleMessage message = new DefaultMuleMessage(new FruitBowl(new Apple(), new Banana()), props,
            muleContext);


        Object result = transformer.transform(message);
        assertNotNull(result);
        assertFalse(result.getClass().isArray());
        assertTrue(result instanceof List<?>);
        List<?> list = (List<?>) result;
        assertTrue(list.contains("moo"));

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     * @throws TransformerException
     */
    @Test
    public void testExpressionEvaluationClassLoader() throws ClassNotFoundException, TransformerException
    {
        ExpressionTransformer transformer = new ExpressionTransformer();
        transformer.setMuleContext(muleContext);
        transformer.addArgument(new ExpressionArgument("test", new ExpressionConfig(
            "payload instanceof org.MyClass", "groovy", null), false));


        ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
        try
        {
            Thread.currentThread().setContextClassLoader(new MyClassClassLoader());
            transformer.initialise();
        }
        catch (Exception e)
        {
            fail(e.getMessage());
        }
        finally
        {
            Thread.currentThread().setContextClassLoader(originalClassLoader);
        }


        assertFalse((Boolean) transformer.transform("test"));
    }

View Full Code Here

    }


    @Test
    public void testExpressionEvaluationClassLoaderEL() throws ClassNotFoundException, TransformerException
    {
        ExpressionTransformer transformer = new ExpressionTransformer();
        transformer.setMuleContext(muleContext);
        transformer.addArgument(new ExpressionArgument("test", new ExpressionConfig("payload is org.MyClass",
            null, null), false));


        ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
        try
        {
            Thread.currentThread().setContextClassLoader(new MyClassClassLoader());
            transformer.initialise();
        }
        catch (Exception e)
        {
            fail(e.getMessage());
        }
        finally
        {
            Thread.currentThread().setContextClassLoader(originalClassLoader);
        }


        assertFalse((Boolean) transformer.transform("test"));
    }

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org.mule.config.expression.ExpressionAnnotationsHelper

org.mule.construct.Validator

org.mule.impl.model.resolvers.AnnotatedEntryPointResolver

org.mule.test.transformers.ExpressionTransformerTestCase

org.mule.transformers.simple.ExpressionTransformerELTestCase

org.mule.transformers.simple.ExpressionTransformerTestCase

org.mule.api.transformer.TransformerException

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