gistfile1.java

   /**
    * Updates the forge version
    *
    * @param specificVersion if you need a specific version
    */
   @Command(value = "update", help = "Update this forge installation")
   public void update() throws IOException
   {
      Dependency forgeDistribution = getLatestAvailableDistribution();
      if (forgeDistribution == null)
      {
         ShellMessages.info(shell, "Forge is already updated to the latest available version ! Enjoy !");
      }
      else
      {
         shell.print("The latest available Forge version is: ");
         shell.println(ShellColor.BOLD, forgeDistribution.getVersion());
         if (prompt.promptBoolean("Would you like to download it ?", true))
         {
            updateForge(forgeDistribution);
         }
      }
   }

   /**
    * Returns the latest available distribution
    *
    * @return
    */
   private Dependency getLatestAvailableDistribution()
   {
      final String runtimeVersion = environment.getRuntimeVersion();
      DependencyQuery query = DependencyQueryBuilder.create(DependencyBuilder
               .create("org.jboss.forge:forge-distribution:::zip")).setFilter(
               new CompositeDependencyFilter(
                        new NonSnapshotDependencyFilter(),
                        new DependencyFilter()
                        {
                           /**
                            * Display only versions higher than
                            */
                           @Override
                           public boolean accept(Dependency dependency)
                           {
                              return dependency.getVersion().compareTo(runtimeVersion) > 0;
                           }
                        }
               ));
      List<Dependency> versions = resolver.resolveVersions(query);
      return versions.isEmpty() ? null : versions.get(versions.size() - 1);
   }

   /**
    * Unpacks the dependency info a specific folder
    *
    * @param dependency
    */
   private void updateForge(Dependency dependency) throws IOException
   {
      List<DependencyResource> resolvedArtifacts = resolver.resolveArtifacts(dependency);
      Assert.isTrue(resolvedArtifacts.size() == 1, "Artifact was not found");
      DependencyResource resource = resolvedArtifacts.get(0);
      DirectoryResource forgeHome = environment.getForgeHome();
      DirectoryResource childDirectory = forgeHome.getChildDirectory("forge_update");
      if (childDirectory.exists())
      {
         childDirectory.delete(true);
      }
      childDirectory.mkdir();
      Files.unzip(resource.getUnderlyingResourceObject(), childDirectory.getUnderlyingResourceObject());
      ShellMessages.success(shell, "Forge was successfully updated !");
   }