Java Classpath Helper

java_classpath.rb

class JavaClasspath
  class << self
    def bootstrap(jar_dirs, classpath_dirs)
      jar_dirs.each do |jardir|
        Dir.entries(jardir).grep(/\.jar$/) {|jar| add_expanded_path(File.join(jardir, jar))}
      end

      classpath_dirs.each do |cp_dir|
        add_expanded_path(cp_dir)
      end
    end

    def add_expanded_path(file)
      if File.directory?(file)
        $CLASSPATH << "#{File.expand_path(file)}/"
      else
        $CLASSPATH << File.expand_path(file)
      end
    end

    def add_jars_from_dir(jardir)
      unless File.exists?(jardir)
        raise "#{jardir} doesn't exist"
      end

      Dir.entries(jardir).grep(/\.jar$/) {|jar| add_expanded_path(File.join(jardir, jar))}
    end
  end