Module: MavenGem::PomSpec

Defined in:
lib/pom2gem.rb

Class Method Summary collapse

Class Method Details

.from_doc(pom_doc, options = {}) ⇒ Object 



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# File 'lib/pom2gem.rb', line 67

def self.from_doc(pom_doc, options = {})
  begin
    spec = Gem::Specification.new

    spec.platform = "java"

    artifact = nil
    group = nil
    version = nil
    maven_version = nil
    titleized_classname = nil

    puts "Processing POM" if options[:verbose]
    pom_doc.elements.each("/project/*") do |element|
      case element.name
      when "artifactId"
        spec.name = element.text
        artifact = element.text
        titleized_classname = artifact.chomp('.rb').split('-').collect { |e| e.capitalize }.join
      when "groupId"
        group = element.text
      when "version"
        maven_version = element.text
        version = MavenGem::PomSpec.maven_to_gem_version(maven_version)
        spec.version = version
      when "description"
        spec.description = element.text
      when "dependencies"
        element.elements.each do |dependency|
          dep_artifact = dependency.elements[2].text
          dep_version = dependency.elements[3].text

          new_dep = Gem::Dependency.new(dep_artifact, "=#{dep_version}")
          spec.dependencies << new_dep
        end
      when "developers"
        element.elements.each("developer") do |developer|
          spec.authors << developer.elements[2].text
        end
      when "url"
        spec.homepage = element.text
      end
    end

    group_dir = group.gsub('.', '/')
    spec.lib_files << "#{artifact}.rb"
    gem_name = "#{artifact}-#{version}"
    gem_dir = "#{gem_name}.#{$$}"
    remote_dir = "#{group_dir}/#{artifact}/#{version}"
    jar_file = "#{gem_name}.jar"
    spec.lib_files << jar_file

    puts "Using #{gem_dir} work dir" if options[:verbose]
    FileUtils.mkdir_p(gem_dir)
    FileUtils.mkdir_p("#{gem_dir}/lib")

    full_url = "#{maven_base_url}/#{remote_dir}/#{jar_file}"
    puts "Fetching #{full_url}" if options[:verbose]
    uri = URI.parse(full_url)
    jar_contents = Net::HTTP.get(uri)
    File.open("#{gem_dir}/lib/#{jar_file}", 'w') {|f| f.write(jar_contents)}

    ruby_file_contents = <<HEREDOC
module #{titleized_classname}
  VERSION = '#{version}'
  MAVEN_VERSION = '#{maven_version}'   
end
begin
  require 'java'
  require File.dirname(__FILE__) + '/#{jar_file}'
rescue LoadError
  puts 'JAR-based gems require JRuby to load. Please visit www.jruby.org.'
  raise
end
HEREDOC
    ruby_file = "#{gem_dir}/lib/#{artifact}.rb"
    puts "Writing #{ruby_file}" if options[:verbose]
    File.open(ruby_file, 'w') do |file|
      file.write(ruby_file_contents)
    end

    metadata_file = "#{gem_dir}/metadata"
    puts "Writing #{metadata_file}" if options[:verbose]
    File.open(metadata_file, 'w') do |file|
      file.write(spec.to_yaml)
    end

    gem_file = "#{gem_name}-java.gem"

    puts "Building #{gem_file}" if options[:verbose]
    Dir.chdir(gem_dir) do
      fail unless
        system('gzip metadata') and
        system('tar czf data.tar.gz lib/*') and
        system("tar cf ../#{gem_file} data.tar.gz metadata.gz")
    end

    puts "Done!" if options[:verbose]
  ensure
    FileUtils.rm_rf(gem_dir)
  end

  "#{gem_name}-java.gem"
end

.from_file(filename, options = {}) ⇒ Object 



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# File 'lib/pom2gem.rb', line 10

def self.from_file(filename, options = {})
  puts "Reading POM from #{filename}" if options[:verbose]
  pom_doc = REXML::Document.new(File.read(filename))
  from_doc(pom_doc, options)
end

.from_url(url, options = {}) ⇒ Object 



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# File 'lib/pom2gem.rb', line 16

def self.from_url(url, options = {})
  uri = URI.parse(url)
  puts "Retrieving POM from #{url}" if options[:verbose]
  pom_doc = REXML::Document.new(Net::HTTP.get(uri))
  from_doc(pom_doc, options)
end

.maven_base_url ⇒ Object 



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# File 'lib/pom2gem.rb', line 172

def self.maven_base_url
  "http://mirrors.ibiblio.org/pub/mirrors/maven2"
end

.maven_to_gem_version(maven_version) ⇒ Object

Unless the maven version string is a valid Gem version string create a substitute gem version string by dividing the maven version string into it’s numeric elements and joining them back together with ‘.’ characters.

The string ‘alpha’ in a maven version string is converted to ‘0’. The string ‘beta’ in a maven version string is converted to ‘1’.

In general gem versions strings need to either be an Integer or start with a digit and a ‘.’.

For example the flying saucer core-renderer jar that uses itext to generate a pdf from styled xhtml input has a version string of “R8pre2”.

Installing this jar:

jruby -S gem maven org/xhtmlrenderer core-renderer R8pre2

results in:

Successfully installed core-renderer-8.2-java
1 gem installed

jruby -S gem list core-renderer

*** LOCAL GEMS ***

core-renderer (8.2)

In addition the following constants are created in the new maven gem:

CoreRenderer::VERSION         # => "8.2"
CoreRenderer::MAVEN_VERSION   # => "R8pre2"



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# File 'lib/pom2gem.rb', line 56

def self.maven_to_gem_version(maven_version)
  maven_version = maven_version.gsub(/alpha/, '0')
  maven_version = maven_version.gsub(/beta/, '1')
  maven_numbers = maven_version.gsub(/\D+/, '.').split('.').find_all { |i| i.length > 0 }
  if maven_numbers.empty?
    '0.0.0'
  else
    maven_numbers.join('.')
  end
end