Support for mappers in assembly desriptors
------------------------------------------

         Key: MNG-1519
         URL: http://jira.codehaus.org/browse/MNG-1519
     Project: Maven 2
        Type: Wish
  Components: maven-assembly-plugin  
    Reporter: Anuerin Diaz


I would like to forward a wish to have the assembly plugin support the notion 
of file mappers similar to the ones in Ant[1]. To illustrate, assuming a 
multi-module project with the following layout:

     Root
       |-Module1
       |-Module2
       |-Container
       |  |-Module3
       |  |-Module4
       |-Module5
       |- pom.xml

and an assembly desriptor entry for the contained modules like this

  <fileSets>
     <fileSets>
        <directory>Container</directory>
        <outputDirectory></outputDirectory>
        <includes>
          <include>**/target/*.jar</include>
        </includes>
     </fileSets>
  </fileSets>

The assembly plugin will be able to get all jar files produced by Module3 and 
Module4 but the "Container/<ModuleName>/target" structure will still be 
included. One workaround is to enumerate each <ModuleName> artifact but 
problematic if the number of contained sub-modules is numerous. Support for 
filemappers which  look like this:

  <fileSets>
     <fileSets>
        <directory>Container</directory>
        <outputDirectory></outputDirectory>
        <includes>
          <include>**/target/*.jar</include>
        </includes>
        <mapper type="flatten">
     </fileSets>
  </fileSets>

will cause all contained jar files to be copied without their original 
structure. This feature would be useful for globbing artifact names as well as 
for physically organizing project structures according to type.

[1] http://ant.apache.org/manual/CoreTypes/mapper.html

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