I'm working on a plugin
<https://github.com/GoogleContainerTools/jib/tree/master/jib-maven-plugin> that
has nested parameters, and I'd like to introduce aliases to give people the
option of more concise configuration. For example, instead of writing:
<configuration>
<from>
<image>baseImage</image>
<auth>
<username>user</username>
<password>pass</password>
</auth>
</from>
</configuration>
they can instead write:
<configuration>
<from.image>baseImage</from.image>
<from.auth.username>user</from.auth.username>
<from.auth.password>pass</from.auth.password>
</configuration>
However, it doesn't seem to be possible to declare aliases directly on
nested parameters. My workaround for this is to create a new top-level
field for each parameter. For example, the original configuration is
possible using this in the mojo:
public static class AuthConfiguration {
@Parameter private String username;
@Parameter private String password;
}
public static class FromConfiguration {
@Parameter private String image;
@Parameter private AuthConfiguration auth = new AuthConfiguration();
}
@Parameter private FromConfiguration from = new FromConfiguration();
And to create an alias, I add a new field, and choose one of the values in
the getter:
@Parameter(alias = "from.image")
private String fromImageAlias;
String getFromImage() {
if (fromImageAlias != null) {
return fromImageAlias;
}
return from.image;
}
This works, but since the alias is just an alias and not a replacement for
the field name, it's still possible to configure the parameter using the
name of the field. e.g.
<configuration>
<fromImageAlias>baseImage</fromImageAlias>
</configuration>
Is it somehow possible to expose a parameter only by its alias, and
disallow configuration using the field name? Or even better, is there a way
of configuring aliases on nested parameters that I don't know about?
P.S. I notice the maven docs
<https://maven.apache.org/plugin-tools/apidocs/org/apache/maven/plugins/annotations/Parameter.html>
say "nested bean injection requires Sisu or JSR330 annotations". Can this
be used to accomplish what I'm looking for, and if so how?
