Class: Inline::Java

Inherits:
Object
  • Object
show all
Defined in:
lib/java_inline.rb

Overview

A Java builder for RubyInline. Provides the basic methods needed to allow assembling a set of Java methods that compile into a class and get bound to the same names in the containing module.

Constant Summary collapse

JFile = 
java.io.File

Instance Method Summary collapse

Constructor Details

#initialize(mod) ⇒ Java

Returns a new instance of Java.



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# File 'lib/java_inline.rb', line 19

def initialize(mod)
  @context = mod
  @src = ""
  @imports = []
  @sigs = []
end

Instance Method Details

#build ⇒ Object 



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

def build
  compiler = ToolProvider.system_java_compiler
  file_mgr = compiler.get_standard_file_manager(nil, nil, nil)
  file_mgr.set_location(StandardLocation::CLASS_OUTPUT, [JFile.new(Inline.directory)])
  
  if @pkg
    directory = "#{Inline.directory}/#{@pkg.gsub('.', '/')}"
    unless File.directory? directory then
      $stderr.puts "NOTE: creating #{directory} for RubyInline" if $DEBUG
      FileUtils.mkdir_p directory
    end
    
    @name = "Java#{@src.hash.abs}"
    @load_name = "#{@pkg}.#{@name}"
    filename = "#{directory}/#{@name}.java"
  
    imports = "import " + @imports.join(";\nimport ") + ";" if @imports.size > 0
    full_src = "
      package #{@pkg};
      #{imports}
      public class #{@name} {
      #{@src}
      }
    "
  else
    @load_name = @name = "Java#{@src.hash.abs}"
    filename = "#{Inline.directory}/#{@name}.java"
  
    imports = "import " + @imports.join(";\nimport ") + ";" if @imports.size > 0
    full_src = "
      #{imports}
      public class #{@name} {
      #{@src}
      }
    "
  end
  
  File.open(filename, "w") {|file| file.write(full_src)}
  file_objs = file_mgr.get_java_file_objects_from_strings([filename])
  
  compiler.get_task(nil, file_mgr, nil, nil, nil, file_objs).call
  file_mgr.close
end

#import(cls) ⇒ Object

Add an “import” line with the given class, as in builder.import “java.util.ArrayList”. The imports will be composed into an appropriate block of code and added to the top of the source.



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# File 'lib/java_inline.rb', line 39

def import(cls)
  if cls.respond_to? :java_class
    @imports << cls.java_class.name
  else
    @imports << cls.to_s
  end
end

#java(src) ⇒ Object

Add a Java method to the built Java source. This expects the method to be public and static, so it can be called as a function.



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# File 'lib/java_inline.rb', line 49

def java(src)
  @src << src << "\n"
  signature = src.match(/public static\W+(\w+)\W+([a-zA-Z0-9_]+)\((.*)\)/)
  raise "Could not parse method signature" unless signature
  @sigs << [signature[1], signature[2], signature[3]]
end

#load ⇒ Object 



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# File 'lib/java_inline.rb', line 100

def load
  @context.module_eval "const_set :#{@name}, ::Java::#{@load_name}"
  @sigs.each do |sig|
    @context.module_eval "def #{sig[1]}(*args); #{@name}.#{sig[1]}(*args); end"
  end
end

#load_cache ⇒ Object 



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# File 'lib/java_inline.rb', line 26

def load_cache
  false
end

#package(pkg) ⇒ Object

Set the package to use for the Java class being generated, as in builder.package “org.foo.bar”



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# File 'lib/java_inline.rb', line 32

def package(pkg)
  @pkg = pkg
end