Add support for setting resultType on Simple expressions
--------------------------------------------------------
Key: CAMEL-4090
URL: https://issues.apache.org/jira/browse/CAMEL-4090
Project: Camel
Issue Type: New Feature
Components: camel-core
Reporter: Claus Ibsen
Assignee: Claus Ibsen
Fix For: 2.8.0
When people are using the simple expression such as setting a header etc, they
may want to control what the result type of the expression is. Suppose they
want to set a boolean
{code:xml}
<setHeader headerName="foo">
<simple>true</simple>
</setHeader>
{code}
What happens is that the type of the foo header will be a String as thats the
default type from a simple expression.
We should add the resultType attribute which other expressions has such as
XPath/XQuery etc.
Then you can do as follows:
{code:xml}
<setHeader headerName="foo">
<simple resultType="java.lang.Boolean">true</simple>
</setHeader>
{code}
Likewise it should be possible in Java DSL.
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