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  1. JDK
  2. JDK-4089881

java.io.File: Want to change file permissions/info

    Details

    • Type: Enhancement
    • Status: Closed
    • Priority: P4
    • Resolution: Duplicate
    • Affects Version/s: 1.1.4, 1.1.5, 1.1.6, 1.2.0
    • Fix Version/s: None
    • Component/s: core-libs
    • Subcomponent:
    • CPU:
      generic, x86, sparc
    • OS:
      generic, solaris_2.5.1, solaris_2.6, windows_95, windows_nt

      Description

      Name: rm29839 Date: 10/30/97


      I would like to have simple calls to set the
      permissions on a file.

      i.e.
      setWritable
      setReadable
      setExecutable?

      There are ways of requesting this info in
      java.io.File, but no ways of setting them.
      Ideally, it would be nice to full chmod
      capability, but failing that at least a
      simple set read/writeable.
      (Review ID: 14921)
      ======================================================================

      The current functionality for accessing files
      and file systems is rather limited. I belive it
      is possible to evolve it to a more full functionality
      and still keep it platform independent.

      Java is no longer percieved as a language only for
      accessing the web. It will be used for state-of-
      the-art application and system development.
      For this purpose, it need to have - in principle -
      the same capabilities as a native platform.

      The current io package cannot handle file access
      rights for users, groups, etc. The original reason
      for this lack of functionality may have been to
      keep Java platform independent. It may take some
      work, but it is possible to get this functionality
      in a almost platform independent manner.

      I would like to know if there is any work currently
      going on in this area?

      My first few (very early) ideas in this line
      follows below.

      I actually belive that it is possible to - for example -
      implement a file system browser which is plattform
      independent, with the functionality to completly
      replace a platform specific file system browser.

      I also belive that it is possible to deliver platoform
      independent programs with platform specific bundles
      to configure the platform dependent file system
      support.

      The general architechture idea is as follows.

      Develope a abstract file system interface
      with access capabilities in three layers.
      These layers progressivly adds capabilities
      or concepts for access rights.

      Layers:

       1) No user, group concepts.

       2) User and group concepts with the functionality
          of UNIX and NFS.

       3) Access Control Lists and functionality of
          Windows NT and standards such as the Orange Book.

      The idea is that a program can manipulate the file
      system with metods of the highest layer, and get
      the results of the layer supported by the platform.

      A user with a GUI will see and manipulate the file
      system at the functionality supported by the platform.

      A program without a GUI man be delivered with a
      resource bundle specifying platform specific
      file system details of which the program is not
      aware. For example, by installing users and groups
      which owns files created by the program.

      You may note that the work amounts to specify
      a file system in Java. It is platform specific
      in the meaning that it isn't modelled after
      a specific platform. But it cannot be done
      without specifying a model architecture for
      the file system. In practice, this will not cause
      any great concern since different operating systems
      doesn't seems to differ greatly in the concepts
      used.
      ###@###.### 10/15/04 20:40 GMT

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              • Assignee:
                mr Mark Reinhold
                Reporter:
                rmandelsunw Ronan Mandel (Inactive)
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                • Created:
                  Updated:
                  Resolved:
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