Examples of org.mule.routing.filters.ExpressionFilter

org.mule.routing.filters.ExpressionFilter
Allows boolean expressions to be executed on a message. Note that when using this filter you must be able to either specify a boolean expression when using an expression filter or use one of the standard Mule filters. These can be defined as follows -
- RegEx - 'regex:': #[regex:'error' [0-9]]
- Wildcard - 'wildcard:': #[wildcard: *foo*
- PayloadType - 'payload-type:': #[payload:javax.jms.TextMessage]
- ExceptionType - 'exception-type:': #[exception-type:java.io.FileNotFoundException]
- Header - 'header:': #[header:foo!=null]
Otherwise you can use eny expression filter providing you can define a boolean expression i.e. #[xpath:count(/Foo/Bar) == 0] Note that it if the expression is not a boolean expression this filter will return true if the expression returns a result

    {
        if (null != property)
        {
            ExpressionConfig config = new ExpressionConfig();
            config.parse(property);
            ExpressionFilter filter = new ExpressionFilter(config.getExpression(), config.getEvaluator(), config.getCustomEvaluator());
            filter.setMuleContext(context);
            return filter;
        }
        else
        {
            return null;

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    }


    @Test
    public void testExpressionFilter() throws Exception
    {
        ExpressionFilter filter = new ExpressionFilter("#[json:[0]/text]");
        filter.setMuleContext(muleContext);
        assertTrue(filter.accept(message));


        filter.setExpression("[0]/favorited");
        assertFalse(filter.accept(message));


        filter.setExpression("[0]/truncated");
        assertTrue(filter.accept(message));


        filter.setExpression("[0]/source");
        assertTrue(filter.accept(message));


        filter.setExpression("[0]/xxx");
        assertFalse(filter.accept(message));
    }

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    }


    @Test
    public void testExpressionFilterWithBooleanLogic() throws Exception
    {
        ExpressionFilter filter = new ExpressionFilter("#[json:[0]/text]");
        filter.setMuleContext(muleContext);
        assertTrue(filter.accept(message));


        filter.setExpression("[0]/favorited=false");
        assertTrue(filter.accept(message));


        filter.setExpression("[0]/truncated != true");
        assertFalse(filter.accept(message));


        filter.setExpression("[0]/source=null");
        assertFalse(filter.accept(message));


        filter.setExpression("[0]/source!= null");
        assertTrue(filter.accept(message));


    }

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    @Test
    public void testExpressionFilterWithBooleanLogicWhereElementDoesNotExist() throws Exception
    {
        // Checks against elements that do not exist


        ExpressionFilter filter = new ExpressionFilter("#[json:[0]/xyz = null]");
        filter.setMuleContext(muleContext);
        assertTrue(filter.accept(message));


        filter.setExpression("[0]/xyz!= null");
        assertFalse(filter.accept(message));
    }

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Related Classes of org.mule.routing.filters.ExpressionFilter

org.mule.config.converters.FilterConverter

org.mule.config.dsl.routers.WhenDefinition

org.mule.expression.ExpressionConfig

org.mule.module.ibeans.spi.MuleResponseTransformInterceptor

org.mule.module.json.JsonExpressionEvaluatorTestCase

org.mule.routing.FirstSuccessful

org.mule.routing.FirstSuccessfulRoutingStrategy

org.mule.routing.UntilSuccessful

org.mule.test.config.ExpressionFilterConfigTestCase

org.mule.test.integration.routing.outbound.ChoiceRouterTestCase

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