[CAMEL-4753] Let Method call expression accept a nested list of expressions for parameter mapping in XML DSLs

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 2.9.0
• Fix Version/s: 3.0.0
• Component/s: camel-blueprint, camel-core, camel-spring
• Labels: dsl
• Estimated Complexity: Advanced
• Assignee: Unassigned
• Reporter: Claus Ibsen
• Created: 08/Dec/11 12:56
• Updated: 12/Jul/17 17:37
• Resolved: 12/Jul/17 17:37

Description

When using a method call expression, people may want to map parameters. Currently they can use the method name attribute, which supports this in Camel 2.9 onwards. Using a syntax that is similar to java code. See
http://camel.apache.org/bean-binding.html

However Christian S. suggested to also allow to map using a nested list of Expression. So you can do

<method ref="myBean" method="myMethod">
  <xpath>/foo/bar</xpath>
  <simple>${header.cool}</simple>
</method>

That will invoke the myMethod with 2 parameters, and the 1st is the xpath, and the 2nd the simple.

Likewise we could consider improving the <bean> as well, if you want to invoke a bean in a route, eg like a <to>

<bean ref="myBean" method="myMethod">
  <xpath>/foo/bar</xpath>
  <simple>${header.cool}</simple>
</bean>

And for the Java DSL, we may support this as well by using varargs for the list of expressions

.beanRef("myBean", "myMethod", xpath("/foo/bar"), simple("${header.cool"))

The trick is to support this as well in the scala DSL.
And to ensure backwards compatibility.