Examples of org.mule.transformer.simple.MessagePropertiesTransformer

org.mule.transformer.simple.MessagePropertiesTransformer

A configurable message transformer that allows users to add, overwrite, rename and delete properties on the current message. Users can set a {@link List} of 'deleteProperties' regular expressions to remove the matching properties from the message and can also set a {@link Map} of 'addProperties' that will be added to the message and possibly overwrite existing properties with the same name.

If {@link #overwrite} is set to false, and a property exists on the message (even if the value is null, it will be left intact. The transformer then acts as a more gentle 'enricher'. The default setting is true.

        }
    }


    private static MessagePropertiesTransformer newContentLengthHeaderRemover()
    {
        final MessagePropertiesTransformer contentLengthHeaderRemover = new MessagePropertiesTransformer();
        contentLengthHeaderRemover.setScope(PropertyScope.INBOUND);
        contentLengthHeaderRemover.setDeleteProperties("(?i)content-length");
        return contentLengthHeaderRemover;
    }

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    {
        // if transformers have been configured, preemptively drop the content-length header to prevent side effects
        // induced by mismatches
        if ((configurationPattern.hasTransformers()) || (configurationPattern.hasResponseTransformers()))
        {
            final MessagePropertiesTransformer contentLengthHeaderRemover = newContentLengthHeaderRemover();
            if (configurationPattern.hasTransformers())
            {
                builder.chain(contentLengthHeaderRemover);
            }
            if (configurationPattern.hasResponseTransformers())

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        }
    }


    private static MessagePropertiesTransformer newContentLengthHeaderRemover()
    {
        final MessagePropertiesTransformer contentLengthHeaderRemover = new MessagePropertiesTransformer();
        contentLengthHeaderRemover.setScope(PropertyScope.INBOUND);
        contentLengthHeaderRemover.setDeleteProperties("(?i)content-length");
        return contentLengthHeaderRemover;
    }

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    }


    @Test
    public void testOverwriteFlagEnabledByDefault() throws Exception
    {
        MessagePropertiesTransformer t = new MessagePropertiesTransformer();
        Map<String, Object> add = new HashMap<String, Object>();
        add.put("addedProperty", "overwrittenValue");
        t.setAddProperties(add);
        t.setMuleContext(muleContext);


        MuleMessage msg = new DefaultMuleMessage("message", muleContext);
        msg.setOutboundProperty("addedProperty", "originalValue");
        MuleEventContext ctx = getTestEventContext(msg);
        // context clones message
        msg = ctx.getMessage();
        DefaultMuleMessage transformed = (DefaultMuleMessage) t.transform(msg, (String)null);
        assertSame(msg, transformed);
        assertEquals(msg.getUniqueId(), transformed.getUniqueId());
        assertEquals(msg.getPayload(), transformed.getPayload());
        compareProperties(msg, transformed);

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    }


    @Test
    public void testOverwriteFalsePreservesOriginal() throws Exception
    {
        MessagePropertiesTransformer t = new MessagePropertiesTransformer();
        Map<String, Object> add = new HashMap<String, Object>();
        add.put("addedProperty", "overwrittenValue");
        t.setAddProperties(add);
        t.setOverwrite(false);
        t.setMuleContext(muleContext);


        DefaultMuleMessage msg = new DefaultMuleMessage("message", muleContext);
        msg.setProperty("addedProperty", "originalValue", PropertyScope.INVOCATION);
        DefaultMuleMessage transformed = (DefaultMuleMessage) t.transform(msg, (String)null);
        assertSame(msg, transformed);
        assertEquals(msg.getUniqueId(), transformed.getUniqueId());
        assertEquals(msg.getPayload(), transformed.getPayload());
        compareProperties(msg, transformed);

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    }


    @Test
    public void testExpressionsInAddProperties() throws Exception
    {
        MessagePropertiesTransformer t = new MessagePropertiesTransformer();
        Map<String, Object> add = new HashMap<String, Object>();
        add.put("Foo", "#[header:public-house]");
        t.setAddProperties(add);
        t.setMuleContext(muleContext);


        DefaultMuleMessage msg = new DefaultMuleMessage("message", muleContext);
        msg.setOutboundProperty("public-house", "Bar");
        DefaultMuleMessage transformed = (DefaultMuleMessage) t.transform(msg, (String)null);
        assertSame(msg, transformed);
        assertEquals(msg.getUniqueId(), transformed.getUniqueId());
        assertEquals(msg.getPayload(), transformed.getPayload());
        compareProperties(msg, transformed);

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    }


    @Test
    public void testRenameProperties() throws Exception
    {
        MessagePropertiesTransformer t = new MessagePropertiesTransformer();
        Map<String, String> add = new HashMap<String, String>();
        add.put("Foo", "Baz");
        t.setRenameProperties(add);
        t.setScope(PropertyScope.INVOCATION);
        t.setMuleContext(muleContext);


        DefaultMuleMessage msg = new DefaultMuleMessage("message", muleContext);
        msg.setInvocationProperty("Foo", "Bar");
        DefaultMuleMessage transformed = (DefaultMuleMessage) t.transform(msg);
        assertSame(msg, transformed);
        assertEquals(msg.getUniqueId(), transformed.getUniqueId());
        assertEquals(msg.getPayload(), transformed.getPayload());
        compareProperties(msg, transformed);

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    }


    @Test
    public void testDelete() throws Exception
    {
        MessagePropertiesTransformer t = new MessagePropertiesTransformer();
        t.setDeleteProperties("badProperty");
        t.setMuleContext(muleContext);


        DefaultMuleMessage msg = new DefaultMuleMessage("message", muleContext);
        msg.setOutboundProperty("badProperty", "badValue");
        assertEquals("badValue", msg.<Object>getOutboundProperty("badProperty"));
        DefaultMuleMessage transformed = (DefaultMuleMessage) t.transform(msg, (String)null);
        assertSame(msg, transformed);
        assertEquals(msg.getUniqueId(), transformed.getUniqueId());
        assertEquals(msg.getPayload(), transformed.getPayload());
        compareProperties(msg, transformed);

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    }


    @Test
    public void testTransformerConfig() throws Exception
    {
        MessagePropertiesTransformer transformer = (MessagePropertiesTransformer) muleContext.getRegistry().lookupTransformer("testTransformer");
        transformer.setMuleContext(muleContext);
        assertNotNull(transformer);
        assertNotNull(transformer.getAddProperties());
        assertNotNull(transformer.getDeleteProperties());
        assertEquals(2, transformer.getAddProperties().size());
        assertEquals(2, transformer.getDeleteProperties().size());
        assertEquals(1, transformer.getRenameProperties().size());
        assertTrue(transformer.isOverwrite());
        assertEquals("text/baz;charset=UTF-16BE", transformer.getAddProperties().get("Content-Type"));
        assertEquals("value", transformer.getAddProperties().get("key"));
        assertEquals("test-property1", transformer.getDeleteProperties().get(0));
        assertEquals("test-property2", transformer.getDeleteProperties().get(1));
        assertEquals("Faz", transformer.getRenameProperties().get("Foo"));
        assertEquals(PropertyScope.OUTBOUND, transformer.getScope());
    }

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    }


    private void doTestMessageTransformationWithExpression(String expression, String[] validProperties, String[] invalidProperties)
            throws TransformerException
    {
        MessagePropertiesTransformer t = createTransformerWithExpression(expression);


        DefaultMuleMessage msg = new DefaultMuleMessage("message", muleContext);
        addPropertiesToMessage(validProperties, msg);
        addPropertiesToMessage(invalidProperties, msg);


        DefaultMuleMessage transformed = (DefaultMuleMessage) t.transform(msg);
        assertSame(msg, transformed);
        assertEquals(msg.getUniqueId(), transformed.getUniqueId());
        assertEquals(msg.getPayload(), transformed.getPayload());
        assertMessageContainsExpectedProperties(validProperties, invalidProperties, transformed);
    }

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