Maven 2 & 3

Ability to evaluate expressions involving collections

Details

  • Type: New Feature New Feature
  • Status: Open Open
  • Priority: Major Major
  • Resolution: Unresolved
  • Affects Version/s: 2.0.9
  • Fix Version/s: Issues to be reviewed for 3.x
  • Component/s: General
  • Labels:
    None
  • Environment:
    Windows XP Professional SP 2
  • Complexity:
    Intermediate
  • Number of attachments :
    0

Description

The following property is not resolved by Maven:

$

{project.build.resources.resource.directory}

It follows the notation described to access any property within the POM, is there an alternative property that can be used to reference the resource directory?

Activity

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Benjamin Bentmann added a comment -

${project.build.resources.resource.directory}

Note the plural form, "resources" is actually a collection (compare the Maven Model). Not sure whether Maven has some indexing syntax for accessing individual collection elements.

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Benjamin Bentmann added a comment - ${project.build.resources.resource.directory} Note the plural form, "resources" is actually a collection (compare the Maven Model ). Not sure whether Maven has some indexing syntax for accessing individual collection elements.
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Shane Isbell added a comment -

In 3.0, we are converting the model into URI/value pairs: so the parameter you specified would be: http://apache.org/maven/project/build/resources#collection/resource/directory. I've excluded any URI with collection from being used in interpolation because I have no idea how to choose the correct element within the collection, there being, say two resource/directory.

If someone can come up with a solid, deterministic rule for how this can be done, I can implement it.

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Shane Isbell added a comment - In 3.0, we are converting the model into URI/value pairs: so the parameter you specified would be: http://apache.org/maven/project/build/resources#collection/resource/directory . I've excluded any URI with collection from being used in interpolation because I have no idea how to choose the correct element within the collection, there being, say two resource/directory. If someone can come up with a solid, deterministic rule for how this can be done, I can implement it.
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Benjamin Bentmann added a comment - - edited

If someone can come up with a solid, deterministic rule for how this can be done, I can implement it.

Does it need more than an index operator to allow users to specify which collection element they refer to? I mean, the POM is XML, XML is a sequence of elements so all collections should in fact be lists that can be accessed via a zero-based index.

The brackets that Java uses for array indexing are forbidden in URI paths but there are still other available delimiter characters. So, how about something like one of these:

project/build/resources/0/directory
project/build/resources,0/directory
project/build/resources(0)/directory
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Benjamin Bentmann added a comment - - edited If someone can come up with a solid, deterministic rule for how this can be done, I can implement it. Does it need more than an index operator to allow users to specify which collection element they refer to? I mean, the POM is XML, XML is a sequence of elements so all collections should in fact be lists that can be accessed via a zero-based index. The brackets that Java uses for array indexing are forbidden in URI paths but there are still other available delimiter characters. So, how about something like one of these: project/build/resources/0/directory project/build/resources,0/directory project/build/resources(0)/directory
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Benjamin Bentmann added a comment -

See also Expression Access to POM List Elements.

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Benjamin Bentmann added a comment - See also Expression Access to POM List Elements .

People

  • Assignee:
    Unassigned
    Reporter:
    Matthew Tordoff
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Dates

  • Created:
    Updated: