Hi Franz,
I seemed to miss this mail until just now. Sorry for late response.
I was trying to get some information of the plugin itself (A
PluginDescriptor object). In Maven1 this is feasible if Jelly script
refers something like "${plugin.get...}" so I guessed there should be
similar thing in Maven2. More specifically, I tried to find the full
path of a jar file which is one of plugin's dependencies. The workaround
ends up to be declaring a Map parameter with expression
"${plugin.artifactMap}"
Thanks for the link. It's strange that "${plugin}" is not mentioned
there. Maybe nobody needs it anymore, while the code that handles
"plugin" does exist since the very beginning of maven2.
Best regards
-Jiaqi
franz see wrote:
Good day to you, Jiaqi,
Ah..yes. I also don't understand the purpose of that indexOf("/"). The only
use case I can think of for that is that when the "/" is inside the curly
braces....which I don't think is recommendable anyway.
But like what you said, the first argument of ${x.y.z} is irrelevant for the
expression evaluator. Thus, it will still not return null.
Btw, what are you trying to retrieve with ${plugin} -
org.apache.maven.model.Plugin? If so, on top of my head, I suggest getting
all the build plugins and searching for the build plugin which matches
${plugin.groupId} ${plugin.artifactId}, and ${plugin.version}. ...But I am
not sure though why would you want the model of the Plugin.
Btw, for more information about the Maven Properties, kindly check [1].
Cheers,
Franz
[1] http://docs.codehaus.org/display/MAVENUSER/MavenPropertiesGuide
Jiaqi Guo wrote:
Hi Franz,
I tried to get PluginDescriptor within a mojo and got
PluginParameterException, then I started looking at this code.
Assume expression is string "plugin", pathSeparator is -1, the
expression.substring(1) becomes "lugin". Did I miss anything here?
And then looking at ReflectionValueExtractor.java today, I just realized
ReflectionValueExtractor.evaluate("lugin", pluginDescriptor) may work
since the first argument is irrelevant if string doesn't contain '.'.
But I'm more confused by the substring part of what .indexOf("/") is for.
And still, in my Mojo, the parameter with expression "${plugin}" is
causing PluginParameterException which indicates the value of it is null.
Regards
-Jiaqi
franz see wrote:
Good day to you, Jiaqi,
Why do you say that it will be evaluted to null?
Cheers,
Franz
Jiaqi Guo wrote:
Hi there,
I'm trying to find out the build-in variables for a maven2 plugin and
found the following code in
http://svn.apache.org/repos/asf/maven/components/tags/maven-2.0.4/maven-core/src/main/java/org/apache/maven/plugin/PluginParameterExpressionEvaluator.java
line 217:
...
else if ( expression.startsWith( "plugin" ) )
{
try
{
int pathSeparator = expression.indexOf( "/" );
PluginDescriptor pluginDescriptor =
mojoDescriptor.getPluginDescriptor();
if ( pathSeparator > 0 )
{
String pathExpression = expression.substring( 1,
pathSeparator );
value = ReflectionValueExtractor.evaluate(
pathExpression, pluginDescriptor );
value = value + expression.substring( pathSeparator
);
}
else
{
value = ReflectionValueExtractor.evaluate(
expression.substring( 1 ), pluginDescriptor );
}
}
catch ( Exception e )
{
// TODO: don't catch exception
throw new ExpressionEvaluationException( "Error
evaluating plugin parameter expression: " + expression,
e );
}
}
...
If I didn't miss anything this code make the value of any parameter
expression starting with "plugin" to be null for sure, which will cause
PluginParameterException in
org.apache.maven.plugin.DefaultPluginManager.checkRequiredParameters(DefaultPluginManager.java:809).
Same thing happens to "settings" and "project".
Is this a bug of maven-2.0.4? Is there any way to get pluginDescriptor
in Mojo?
Regards
--
Jiaqi Guo
http://www.cyclopsgroup.org
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