Extend Wagon API to support the Stage Plugin
--------------------------------------------
Key: WAGON-209
URL: http://jira.codehaus.org/browse/WAGON-209
Project: Maven Wagon
Issue Type: New Feature
Components: wagon-provider-api
Affects Versions: 1.0-beta-2
Reporter: Benjamin Bentmann
>From the source of the [Maven Stage
>Plugin|http://maven.apache.org/plugins/maven-stage-plugin/]:
{code:java}
( (ScpWagon) targetWagon ).executeCommand( command );
{code}
This smells: The plugin is downcasting to an implementation class, happily
breaking the interface design and making the target wagon non-interchangeable.
The atomic Wagon operations required by the plugin should be identified and
added to the Wagon API. Wagons that can't support these new operations could
simply implement the methods by throwing an {{UnsupportedOperationException}}
exception.
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