add a Visitor API to the org.apache.camel.model package so you can visit a 
RouteDefinition, a set of RouteDefinitions or a subset of a route to determine 
things like languages & endpoints used etc
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                 Key: CAMEL-2130
                 URL: https://issues.apache.org/activemq/browse/CAMEL-2130
             Project: Apache Camel
          Issue Type: Improvement
          Components: camel-core
            Reporter: James Strachan
             Fix For: 2.1.0


we should add a ModelVisitor interface to the model classes so that you can 
visit the model to see what endpoints, languages, dataformats are used - for 
example for reporting, OSGi dependency tracking or UI reasons.

{code}
definition = ...; // a route definition, a node in the route or a set or routes

SimpleVisitor visitor = new SimpleVisitor();
definition.visit(visitor);

System.out.println("The dataformats are: " + visitor.getDataFormats());
System.out.println("The endpoints are: " + visitor.getEndpoints());
System.out.println("The expressions are: " + visitor.getExpressions());
{code}

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