[MPLUGIN-350] Extend @Parameter with input/output option

**[Robert Scholte](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=rfscholte)** opened **[MPLUGIN-350](https://issues.apache.org/jira/browse/MPLUGIN-350?redirect=false)** and commented

By knowing if parameters are input or output parameters, it is possible to improve our builds. It will be possible to create DAGs and chain the execution blocks much smarter.
The Maven Extension created by Gradle heavily relies on this kind of information.

It is probably easier to use new annotations instead of adding a (required) status-field to `@Parameter`
Looking at the `plugin.xml` it looks quite easy to solve this and stay backwards compatible: the file looks now like:

```xml

...

```

With plexus-magic the following should still work:

```xml

...


...

```

Input parameters should refer to the outputParameter it effects. E.g. if a inputParameter has only effect on the logger and it is changed, it will not effect the resulting artifact, which could improve faster incremental builds.

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0 votes, 6 watchers

首先定位 @Parameter 注解以及 issue 中描述的 plugin.xml 生成或表示方式。确定应如何表示输入参数和输出参数，同时保留现有的参数格式，包括输入参数如何引用受影响的输出。完成标准是元数据能够表达这些关系，并保持向后兼容。

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