Class: Naether::Java::Ruby

Inherits:
Object
  • Object
show all
Defined in:
lib/naether/java/ruby.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Ruby

Creates new instance by loading the Naether jar to the parent ClassLoader and creating the internal Naether ClassLoader



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# File 'lib/naether/java/ruby.rb', line 19

def initialize
  require 'rjb' 
  
  naether_jar = Naether::Configuration.naether_jar
        
  # Call Rjb::load with an empty classpath, incase Rjb::load has already been called
  java_opts = (ENV['JAVA_OPTS'] || ENV['JAVA_OPTIONS']).to_s.split

  begin
    Rjb::load("", java_opts)
  rescue StandardError => e
    if e.message == "can't create Java VM"
      puts "RJB was unable to find JVM, try setting JAVA_HOME env"
    end
    raise e
  end
  
  @loaded_paths = []
  load_paths( naether_jar )
  
  class_loader_class = Rjb::import( "com.tobedevoured.naether.PathClassLoader" )
  @class_loader = class_loader_class.new()
    
  internal_load_paths( naether_jar )
  
end

Instance Attribute Details

#class_loader ⇒ Object (readonly)

Returns the value of attribute class_loader.



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# File 'lib/naether/java/ruby.rb', line 13

def class_loader
  @class_loader
end

#loaded_paths ⇒ Object (readonly)

Returns the value of attribute loaded_paths.



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# File 'lib/naether/java/ruby.rb', line 13

def loaded_paths
  @loaded_paths
end

Instance Method Details

#convert_to_java_list(ruby_array) ⇒ java.util.ArrayList

Convert a Ruby Array to a java.util.ArrayList

Parameters:

  • ruby_array (Array) —

    Array to convert to Java.util.ArrayList

Returns:

  • (java.util.ArrayList) 


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# File 'lib/naether/java/ruby.rb', line 148

def convert_to_java_list( ruby_array ) 
  list = Rjb::import("java.util.ArrayList").new
  ruby_array.each do |item|
    list.add( item )
  end
  
  list
end

#convert_to_ruby_array(java_array, to_string = false) ⇒ Array

Convert a java,util.List to a Ruby Array

Parameters:

  • java_array (java.util.ArrayList)
  • to_string (Boolean) (defaults to: false) —

    converts each element using toString

Returns:

  • (Array) 


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# File 'lib/naether/java/ruby.rb', line 164

def convert_to_ruby_array( java_array, to_string = false )
  ruby_array = java_array.toArray()
  
  if to_string
    ruby_array = ruby_array.map { |x| x.toString()}
  end
  
  ruby_array
end

#convert_to_ruby_hash(java_hash, to_string = false) ⇒ Hash

Convert a java.util.Map to a Ruby Hash

Parameters:

  • java_hash (java.util.Map)
  • to_string (Boolean) (defaults to: false) —

    converts each element using toString

Returns:

  • (Hash) 


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# File 'lib/naether/java/ruby.rb', line 181

def convert_to_ruby_hash( java_hash, to_string = false )
  
  hash = {}
  unless java_hash.is_a? Hash
    keys = java_hash.keySet()
    iterator = keys.iterator()
    if to_string
      while iterator.hasNext()
        key = iterator.next().toString()
        hash[key] = java_hash.get( key ).toString()
      end
    else
      while iterator.hasNext()
        key = iterator.next()
        hash[key] = java_hash.get( key )              
      end
    end
  else
    if to_string
      java_hash.each do |k,v|
        hash[k.toString()] = v.toString()
      end
    else
      hash = java_hash
    end
  end
  
  hash
  
end

#create(target_class, *args) ⇒ Object

Create a Java Object from the Naether Class Loader

Parameters:

  • target_class (String) —

    to create

  • args (Array) —

    Array of constructor arguments



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# File 'lib/naether/java/ruby.rb', line 51

def create( target_class, *args )
  #@class_loader.newInstance(target_class, *args )
  if args.size > 0
    @class_loader._invoke('newInstance', 'Ljava.lang.String;[Ljava.lang.Object;', target_class, args )
  else
    @class_loader._invoke('newInstance', 'Ljava.lang.String;', target_class )
  end
end

#exec_static_method(target_class, target_method, params, types = nil) ⇒ Object

Execute a Staic method on a Java class from the Naether Class Loader

Parameters:

  • target_class (String)
  • target_method (String)
  • params (Array) —

    Array of method parameters

  • types (Array) (defaults to: nil) —

    if defined, a Array of String classes of params type that lines up with params one to one.

Returns:

  • (Object) 


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# File 'lib/naether/java/ruby.rb', line 68

def exec_static_method( target_class, target_method, params, types = nil ) 
  unless params.is_a? Array
    params = [params]
  end
  
  if types
    unless types.is_a? Array
       types = [types]
    end
  end
  result = nil
  if params.nil?
    result = @class_loader._invoke('execStaticMethod','Ljava.lang.String;Ljava.lang.String;', target_class, target_method )
  elsif types.nil?
    result = @class_loader._invoke('execStaticMethod','Ljava.lang.String;Ljava.lang.String;Ljava.util.List;', target_class, target_method, convert_to_java_list(params) )
  else
    result = @class_loader._invoke('execStaticMethod','Ljava.lang.String;Ljava.lang.String;Ljava.util.List;Ljava.util.List;', target_class, target_method, convert_to_java_list(params), convert_to_java_list(types) )
  end
  
  unless result.nil?
    # Force toString on java.lang.String otherwise the result will be a Rjb::Proxy
    if result.getClass().getName() == 'java.lang.String'
      result.toString()
    else
      result
    end
  end
end

#internal_load_paths(paths) ⇒ Object

Load a path into the internal Naether ClassLoader

Parameters:

  • paths (Array) —

    as an Array of String paths or a String path



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# File 'lib/naether/java/ruby.rb', line 102

def internal_load_paths(paths)
  loadable_paths = []
  unless paths.is_a? Array
    paths = [paths]
  end
  
  paths.each do |path|
    expanded_path = File.expand_path(path)
    if File.exists?( expanded_path )
      @class_loader.addPath( path )
      loadable_paths << expanded_path
    end
  end
  
  loadable_paths
end

#load_paths(paths) ⇒ Object

Load a path onto the parent ClassLoader

Parameters:

  • paths (Array) —

    as an Array of String paths or a String path



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# File 'lib/naether/java/ruby.rb', line 124

def load_paths(paths)
  loadable_paths = []
  unless paths.is_a? Array
    paths = [paths]
  end
  
  paths.each do |path|
    expanded_path = File.expand_path(path)
    if !@loaded_paths.include?(expanded_path) && File.exists?( expanded_path )
      @loaded_paths << expanded_path
      Rjb::add_jar( expanded_path )
      loadable_paths << expanded_path
    end
  end
  
  loadable_paths
end