16.3. Custom Context Mapper Properties

Your mapFrom() method needs to map a source native message's properties to the SwitchYard Message's Context.
Your mapTo() method needs to map a SwitchYard Message's Context properties into the target native message.
If you extend BaseContextMapper, these methods are canceled with "no-op" implementations so you only have to implement what you wish.

If you are adding regular expression, support, note the following:

The setIncludes(), setExcludes(), setIncludeNamespaces() and setExcludeNamespaces() methods are just bean properties. The matches() methods use those bean properties to determine if the specified name or qualified name passes the collective regular expressions.
If you extend the BaseRegexContextMapper, all of these are implemented for you. Then, in your implementation's mapFrom and mapTo methods, you only need to first check if the property matches before you map it.

Also for RegexContextMapper, the following additional attributes of the <contextMapper/> element are used:

includes: This indicates which context property names to include.
excludes: This indicates which context property names to exclude.
includeNamespaces: This indicates which context property namespaces to include (if the property name is a qualified name).
excludeNamespaces: This indicates which context property namespaces to exclude (if the property name is a qualified name).