Class: Xdrgen::Generators::Java

Inherits:
Base
  • Object
show all
Defined in:
lib/xdrgen/generators/java.rb

Instance Method Summary collapse

Methods inherited from Base

#initialize

Constructor Details

This class inherits a constructor from Xdrgen::Generators::Base

Instance Method Details

#add_imports_for_definition(defn, imports) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 36

def add_imports_for_definition(defn, imports)
  case defn
  when AST::Definitions::Struct ;
    defn.members.each do |m|
      if is_decl_array(m.declaration)
        imports.add('java.util.Arrays')
      else
        imports.add('com.google.common.base.Objects')
      end
    end
    # if we have more than one member field then the
    # hash code will be computed by
    # Objects.hashCode(field1, field2, ..., fieldN)
    # therefore, we should always import com.google.common.base.Objects
    if defn.members.length > 1
      imports.add("com.google.common.base.Objects")
    end
  when AST::Definitions::Enum ;
    # no imports required for enums
  when AST::Definitions::Union ;
    nonVoidArms = defn.arms.select { |arm| !arm.void? }
    # add 1 because of the discriminant
    totalFields = nonVoidArms.length + 1

    if is_type_array(defn.discriminant.type)
      imports.add('java.util.Arrays')
    else
      imports.add('com.google.common.base.Objects')
    end

    nonVoidArms.each do |a|
      if is_decl_array(a.declaration)
        imports.add('java.util.Arrays')
      else
        imports.add('com.google.common.base.Objects')
      end
    end

    # if we have more than one field then the
    # hash code will be computed by
    # Objects.hashCode(field1, field2, ..., fieldN)
    # therefore, we should always import com.google.common.base.Objects
    # if we have more than one field
    if totalFields > 1
      imports.add("com.google.common.base.Objects")
    end
  when AST::Definitions::Typedef ;
    if is_decl_array(defn.declaration)
      imports.add('java.util.Arrays')
    else
      imports.add('com.google.common.base.Objects')
    end
  end

  if defn.respond_to? :nested_definitions
    defn.nested_definitions.each{ |child_defn| add_imports_for_definition(child_defn, imports) }
  end
end

#decl_string(decl) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 820

def decl_string(decl)
  case decl
  when AST::Declarations::Opaque ;
    "byte[]"
  when AST::Declarations::String ;
    "XdrString"
  when AST::Declarations::Array ;
    "#{type_string decl.type}[]"
  when AST::Declarations::Optional ;
    "#{type_string(decl.type)}"
  when AST::Declarations::Simple ;
    type_string(decl.type)
  else
    raise "Unknown declaration type: #{decl.class.name}"
  end
end

#decode_member(value, member, out) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 749

def decode_member(value, member, out)
  case member.declaration
  when AST::Declarations::Void ;
    return
  end
  if member.type.sub_type == :optional
    out.puts <<-EOS.strip_heredoc
      int #{member.name}Present = stream.readInt();
      if (#{member.name}Present != 0) {
    EOS
  end
  case member.declaration
  when AST::Declarations::Opaque ;
    if (member.declaration.fixed?)
      out.puts "int #{member.name}size = #{member.declaration.size};"
    else
      out.puts "int #{member.name}size = stream.readInt();"
    end
    out.puts <<-EOS.strip_heredoc
      #{value}.#{member.name} = new byte[#{member.name}size];
      stream.read(#{value}.#{member.name}, 0, #{member.name}size);
    EOS
  when AST::Declarations::Array ;
    if (member.declaration.fixed?)
      out.puts "int #{member.name}size = #{member.declaration.size};"
    else
      out.puts "int #{member.name}size = stream.readInt();"
    end
    out.puts <<-EOS.strip_heredoc
      #{value}.#{member.name} = new #{type_string member.type}[#{member.name}size];
      for (int i = 0; i < #{member.name}size; i++) {
        #{value}.#{member.name}[i] = #{decode_type member.declaration};
      }
    EOS
  else
    out.puts "#{value}.#{member.name} = #{decode_type member.declaration};"
  end
  if member.type.sub_type == :optional
    out.puts "}"
  end
end

#decode_type(decl) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 791

def decode_type(decl)
  case decl.type
  when AST::Typespecs::Int ;
    "stream.readInt()"
  when AST::Typespecs::UnsignedInt ;
    "stream.readInt()"
  when AST::Typespecs::Hyper ;
    "stream.readLong()"
  when AST::Typespecs::UnsignedHyper ;
    "stream.readLong()"
  when AST::Typespecs::Float ;
    "stream.readFloat()"
  when AST::Typespecs::Double ;
    "stream.readDouble()"
  when AST::Typespecs::Quadruple ;
    raise "cannot render quadruple in golang"
  when AST::Typespecs::Bool ;
    "stream.readInt() == 1 ? true : false"
  when AST::Typespecs::String ;
    "XdrString.decode(stream, #{decl.size})"
  when AST::Typespecs::Simple ;
    "#{name decl.type.resolved_type}.decode(stream)"
  when AST::Concerns::NestedDefinition ;
    "#{name decl.type}.decode(stream)"
  else
    raise "Unknown typespec: #{decl.type.class.name}"
  end
end

#encode_member(value, member, out) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 681

def encode_member(value, member, out)
  case member.declaration
    when AST::Declarations::Void
      return
  end

  if member.type.sub_type == :optional
    out.puts "if (#{value}.#{member.name} != null) {"
    out.puts "stream.writeInt(1);"
  end
  case member.declaration
  when AST::Declarations::Opaque ;
    out.puts "int #{member.name}size = #{value}.#{member.name}.length;"
    unless member.declaration.fixed?
      out.puts "stream.writeInt(#{member.name}size);"
    end
    out.puts <<-EOS.strip_heredoc
      stream.write(#{value}.get#{member.name.slice(0,1).capitalize+member.name.slice(1..-1)}(), 0, #{member.name}size);
    EOS
  when AST::Declarations::Array ;
    out.puts "int #{member.name}size = #{value}.get#{member.name.slice(0,1).capitalize+member.name.slice(1..-1)}().length;"
    unless member.declaration.fixed?
      out.puts "stream.writeInt(#{member.name}size);"
    end
    out.puts <<-EOS.strip_heredoc
      for (int i = 0; i < #{member.name}size; i++) {
        #{encode_type member.declaration.type, "#{value}.#{member.name}[i]"};
      }
    EOS
  else
    out.puts "#{encode_type member.declaration.type, "#{value}.#{member.name}"};"
  end
  if member.type.sub_type == :optional
    out.puts "} else {"
    out.puts "stream.writeInt(0);"
    out.puts "}"
  end
end

#encode_type(type, value) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 720

def encode_type(type, value)
  case type
  when AST::Typespecs::Int ;
    "stream.writeInt(#{value})"
  when AST::Typespecs::UnsignedInt ;
    "stream.writeInt(#{value})"
  when AST::Typespecs::Hyper ;
    "stream.writeLong(#{value})"
  when AST::Typespecs::UnsignedHyper ;
    "stream.writeLong(#{value})"
  when AST::Typespecs::Float ;
    "stream.writeFloat(#{value})"
  when AST::Typespecs::Double ;
    "stream.writeDouble(#{value})"
  when AST::Typespecs::Quadruple ;
    raise "cannot render quadruple in golang"
  when AST::Typespecs::Bool ;
    "stream.writeInt(#{value} ? 1 : 0)"
  when AST::Typespecs::String ;
    "#{value}.encode(stream)"
  when AST::Typespecs::Simple ;
    "#{name type.resolved_type}.encode(stream, #{value})"
  when AST::Concerns::NestedDefinition ;
    "#{name type}.encode(stream, #{value})"
  else
    raise "Unknown typespec: #{type.class.name}"
  end
end

#generate ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 8

def generate
  render_lib
  render_definitions(@top)
end

#is_decl_array(decl) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 837

def is_decl_array(decl)
  case decl
  when AST::Declarations::Opaque ;
    true
  when AST::Declarations::Array ;
    true
  when AST::Declarations::Optional ;
    is_type_array(decl.type)
  when AST::Declarations::Simple ;
  is_type_array(decl.type)
  else
    false
  end
end

#is_type_array(type) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 852

def is_type_array(type)
  case type
  when AST::Typespecs::Opaque ;
    true
  else
    false
  end
end

#name(named) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 892

def name(named)
  parent = name named.parent_defn if named.is_a?(AST::Concerns::NestedDefinition)
  result = named.name.camelize

  "#{parent}#{result}"
end

#name_string(name) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 899

def name_string(name)
  name.camelize
end

#render_definition(defn) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 95

def render_definition(defn)
  imports = Set[]
  add_imports_for_definition(defn, imports)

  case defn
  when AST::Definitions::Struct ;
    render_element "public class", imports, defn do |out|
      render_struct defn, out
      render_nested_definitions defn, out
    end
  when AST::Definitions::Enum ;
    render_element "public enum", imports, defn do |out|
      render_enum defn, out
    end
  when AST::Definitions::Union ;
    render_element "public class", imports, defn do |out|
      render_union defn, out
      render_nested_definitions defn, out
    end
  when AST::Definitions::Typedef ;
    render_element "public class", imports, defn do |out|
      render_typedef defn, out
    end
  end
end

#render_definitions(node) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 31

def render_definitions(node)
  node.namespaces.each{|n| render_definitions n }
  node.definitions.each(&method(:render_definition))
end

#render_element(type, imports, element, post_name = "implements XdrElement") ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 159

def render_element(type, imports, element, post_name="implements XdrElement")
  path = element.name.camelize + ".java"
  name = name_string element.name
  out  = @output.open(path)
  render_top_matter out
  imports.each do |import|
    out.puts "import #{import};"
  end
  out.puts "\n"
  render_source_comment out, element
  out.puts "#{type} #{name} #{post_name} {"
  out.indent do
    yield out
    out.unbreak
  end
  out.puts "}"
end

#render_enum(enum, out) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 177

def render_enum(enum, out)
  out.balance_after /,[\s]*/ do
    enum.members.each do |em|
      out.puts "#{em.name}(#{em.value}),"
    end
  end
  out.puts ";\n"
  out.puts <<-EOS.strip_heredoc
  private int mValue;

  #{name_string enum.name}(int value) {
      mValue = value;
  }

  public int getValue() {
      return mValue;
  }

  public static #{name_string enum.name} decode(XdrDataInputStream stream) throws IOException {
    int value = stream.readInt();
    switch (value) {
  EOS
  out.indent 2 do
    enum.members.each do |em|
      out.puts "case #{em.value}: return #{em.name};"
    end
  end
  out.puts <<-EOS.strip_heredoc
      default:
        throw new RuntimeException("Unknown enum value: " + value);
    }
  }

  public static void encode(XdrDataOutputStream stream, #{name_string enum.name} value) throws IOException {
    stream.writeInt(value.getValue());
  }

  public void encode(XdrDataOutputStream stream) throws IOException {
    encode(stream, this);
  }
  EOS
  out.break
end

#render_lib ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 13

def render_lib
  template = IO.read(__dir__ + "/java/XdrDataInputStream.erb")
  result = ERB.new(template).result binding
  @output.write  "XdrDataInputStream.java", result

  template = IO.read(__dir__ + "/java/XdrDataOutputStream.erb")
  result = ERB.new(template).result binding
  @output.write  "XdrDataOutputStream.java", result

  template = IO.read(__dir__ + "/java/XdrElement.erb")
  result = ERB.new(template).result binding
  @output.write  "XdrElement.java", result

  template = IO.read(__dir__ + "/java/XdrString.erb")
  result = ERB.new(template).result binding
  @output.write  "XdrString.java", result
end

#render_nested_definitions(defn, out) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 121

def render_nested_definitions(defn, out)
  return unless defn.respond_to? :nested_definitions
  defn.nested_definitions.each{|ndefn|
    case ndefn
    when AST::Definitions::Struct ;
      name = name ndefn
      out.puts "public static class #{name} {"
      out.indent do
        render_struct ndefn, out
        render_nested_definitions ndefn , out
      end
      out.puts "}"
    when AST::Definitions::Enum ;
      name = name ndefn
      out.puts "public static enum #{name} {"
      out.indent do
        render_enum ndefn, out
      end
      out.puts "}"
    when AST::Definitions::Union ;
      name = name ndefn
      out.puts "public static class #{name} {"
      out.indent do
        render_union ndefn, out
        render_nested_definitions ndefn, out
      end
      out.puts "}"
    when AST::Definitions::Typedef ;
      name = name ndefn
      out.puts "public static class #{name} {"
      out.indent do
        render_typedef ndefn, out
      end
      out.puts "}"
    end
  }
end

#render_source_comment(out, defn) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 665

def render_source_comment(out, defn)
  return if defn.is_a?(AST::Definitions::Namespace)

  out.puts <<-EOS.strip_heredoc
  // === xdr source ============================================================

  EOS

  out.puts "//  " + defn.text_value.split("\n").join("\n//  ")

  out.puts <<-EOS.strip_heredoc

  //  ===========================================================================
  EOS
end

#render_struct(struct, out) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 221

def render_struct(struct, out)
  out.puts "public #{name struct} () {}"
  struct.members.each do |m|
    out.puts <<-EOS.strip_heredoc
      private #{decl_string(m.declaration)} #{m.name};
      public #{decl_string(m.declaration)} get#{m.name.slice(0,1).capitalize+m.name.slice(1..-1)}() {
        return this.#{m.name};
      }
      public void set#{m.name.slice(0,1).capitalize+m.name.slice(1..-1)}(#{decl_string m.declaration} value) {
        this.#{m.name} = value;
      }
    EOS
  end


  out.puts "public static void encode(XdrDataOutputStream stream, #{name struct} encoded#{name struct}) throws IOException{"
  struct.members.each do |m|
    out.indent do
      encode_member "encoded#{name struct}", m, out
    end
  end
  out.puts "}"

  out.puts <<-EOS.strip_heredoc
    public void encode(XdrDataOutputStream stream) throws IOException {
      encode(stream, this);
    }
  EOS

  out.puts <<-EOS.strip_heredoc
    public static #{name struct} decode(XdrDataInputStream stream) throws IOException {
      #{name struct} decoded#{name struct} = new #{name struct}();
  EOS
  struct.members.each do |m|
    out.indent do
      decode_member "decoded#{name struct}", m, out
    end
  end
  out.indent do
    out.puts "return decoded#{name struct};"
  end
  out.puts "}"

  hashCodeExpression = case struct.members.length
    when 0
      "0"
    when 1
      if is_decl_array(struct.members[0].declaration)
        "Arrays.hashCode(this.#{struct.members[0].name})"
      else
        "Objects.hashCode(this.#{struct.members[0].name})"
      end
    else
      "Objects.hashCode(#{
        (struct.members.map { |m|
          if is_decl_array(m.declaration)
            "Arrays.hashCode(this.#{m.name})"
          else
            "this.#{m.name}"
          end
        }).join(", ")
      })"
  end
  out.puts <<-EOS.strip_heredoc
    @Override
    public int hashCode() {
      return #{hashCodeExpression};
    }
  EOS

  equalParts = struct.members.map { |m|
    if is_decl_array(m.declaration)
      "Arrays.equals(this.#{m.name}, other.#{m.name})"
    else
      "Objects.equal(this.#{m.name}, other.#{m.name})"
    end
  }
  equalExpression = case equalParts.length
    when 0
      "true"
    else
      equalParts.join(" && ")
  end
  type = name struct
  out.puts <<-EOS.strip_heredoc
    @Override
    public boolean equals(Object object) {
      if (!(object instanceof #{type})) {
        return false;
      }

      #{type} other = (#{type}) object;
      return #{equalExpression};
    }

  EOS

  out.puts "public static final class Builder {"
  out.indent do
    struct.members.map { |m|
      out.puts "private #{decl_string(m.declaration)} #{m.name};"
    }

    struct.members.map { |m|
      out.puts <<-EOS.strip_heredoc

        public Builder #{m.name}(#{decl_string(m.declaration)} #{m.name}) {
          this.#{m.name} = #{m.name};
          return this;
        }
      EOS
    }

  end


  out.indent do
    out.break
    out.puts "public #{name struct} build() {"
    out.indent do
      out.puts "#{name struct} val = new #{name struct}();"
      struct.members.map { |m|
        out.puts "val.set#{m.name.slice(0,1).capitalize+m.name.slice(1..-1)}(#{m.name});"
      }
      out.puts "return val;"
    end
    out.puts "}"
  end
  out.puts "}"
  out.break
end

#render_top_matter(out) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 652

def render_top_matter(out)
  out.puts <<-EOS.strip_heredoc
    // Automatically generated by xdrgen
    // DO NOT EDIT or your changes may be overwritten

    package #{@namespace};


    import java.io.IOException;
  EOS
  out.break
end

#render_typedef(typedef, out) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 353

def render_typedef(typedef, out)
  out.puts <<-EOS.strip_heredoc
    private #{decl_string typedef.declaration} #{typedef.name};

    public #{typedef.name.camelize}() {}

    public #{typedef.name.camelize}(#{decl_string typedef.declaration} #{typedef.name}) {
      this.#{typedef.name} = #{typedef.name};
    }

    public #{decl_string typedef.declaration} get#{typedef.name.slice(0,1).capitalize+typedef.name.slice(1..-1)}() {
      return this.#{typedef.name};
    }

    public void set#{typedef.name.slice(0,1).capitalize+typedef.name.slice(1..-1)}(#{decl_string typedef.declaration} value) {
      this.#{typedef.name} = value;
    }

  EOS

  out.puts "public static void encode(XdrDataOutputStream stream, #{name typedef}  encoded#{name typedef}) throws IOException {"
  out.indent do
    encode_member "encoded#{name typedef}", typedef, out
  end
  out.puts "}"
  out.break

  out.puts <<-EOS.strip_heredoc
    public void encode(XdrDataOutputStream stream) throws IOException {
      encode(stream, this);
    }
  EOS

  out.puts <<-EOS.strip_heredoc
    public static #{name typedef} decode(XdrDataInputStream stream) throws IOException {
      #{name typedef} decoded#{name typedef} = new #{name typedef}();
  EOS
  out.indent do
    decode_member "decoded#{name typedef}", typedef, out
    out.puts "return decoded#{name typedef};"
  end
  out.puts "}"
  out.break

  hash_coder_for_decl =
    if is_decl_array(typedef.declaration)
      "Arrays.hashCode"
    else
      "Objects.hashCode"
    end
  out.puts <<-EOS.strip_heredoc
    @Override
    public int hashCode() {
      return #{hash_coder_for_decl}(this.#{typedef.name});
    }

  EOS

  equals_for_decl =
    if is_decl_array(typedef.declaration)
      "Arrays.equals"
    else
      "Objects.equal"
    end
  type = name_string typedef.name
  out.puts <<-EOS.strip_heredoc
    @Override
    public boolean equals(Object object) {
      if (!(object instanceof #{type})) {
        return false;
      }

      #{type} other = (#{type}) object;
      return #{equals_for_decl}(this.#{typedef.name}, other.#{typedef.name});
    }
  EOS
end

#render_union(union, out) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 431

def render_union(union, out)
  out.puts "public #{name union} () {}"
  out.puts <<-EOS.strip_heredoc
    #{type_string union.discriminant.type} #{union.discriminant.name};
    public #{type_string union.discriminant.type} getDiscriminant() {
      return this.#{union.discriminant.name};
    }
    public void setDiscriminant(#{type_string union.discriminant.type} value) {
      this.#{union.discriminant.name} = value;
    }
  EOS
  union.arms.each do |arm|
    next if arm.void?
    out.puts <<-EOS.strip_heredoc
      private #{decl_string(arm.declaration)} #{arm.name};
      public #{decl_string(arm.declaration)} get#{arm.name.slice(0,1).capitalize+arm.name.slice(1..-1)}() {
        return this.#{arm.name};
      }
      public void set#{arm.name.slice(0,1).capitalize+arm.name.slice(1..-1)}(#{decl_string arm.declaration} value) {
        this.#{arm.name} = value;
      }
    EOS
  end
  out.break

  out.puts "public static final class Builder {"
  out.indent do
    out.puts "private #{type_string union.discriminant.type} discriminant;"
    union.arms.each do |arm|
      next if arm.void?
      out.puts "private #{decl_string(arm.declaration)} #{arm.name};"
    end
    out.break

    out.puts <<-EOS.strip_heredoc
      public Builder discriminant(#{type_string union.discriminant.type} discriminant) {
        this.discriminant = discriminant;
        return this;
      }
    EOS

    union.arms.each do |arm|
      next if arm.void?
      out.puts <<-EOS.strip_heredoc

        public Builder #{arm.name}(#{decl_string(arm.declaration)} #{arm.name}) {
          this.#{arm.name} = #{arm.name};
          return this;
        }
      EOS
    end
  end

  out.indent do
    out.break
    out.puts "public #{name union} build() {"
    out.indent do
      out.puts "#{name union} val = new #{name union}();"
      out.puts "val.setDiscriminant(discriminant);"
      union.arms.each do |arm|
        next if arm.void?
        out.puts "val.set#{arm.name.slice(0,1).capitalize+arm.name.slice(1..-1)}(#{arm.name});"
      end
      out.puts "return val;"
    end
    out.puts "}"
  end
  out.puts "}"
  out.break


  out.puts "public static void encode(XdrDataOutputStream stream, #{name union} encoded#{name union}) throws IOException {"
  out.puts('//' + union.discriminant.type.class.to_s)
  out.puts("//" + type_string(union.discriminant.type))
  if union.discriminant.type.is_a?(AST::Typespecs::Int)
    out.puts "stream.writeInt(encoded#{name union}.getDiscriminant().intValue());"
  elsif type_string(union.discriminant.type) == "Uint32"
    # ugly workaround for compile error after generating source for AuthenticatedMessage in stellar-core
    out.puts "stream.writeInt(encoded#{name union}.getDiscriminant().getUint32());"
  else
    out.puts "stream.writeInt(encoded#{name union}.getDiscriminant().getValue());"
  end
  if type_string(union.discriminant.type) == "Uint32"
    # ugly workaround for compile error after generating source for AuthenticatedMessage in stellar-core
    out.puts "switch (encoded#{name union}.getDiscriminant().getUint32()) {"
  else
    out.puts "switch (encoded#{name union}.getDiscriminant()) {"
  end
  union.arms.each do |arm|
    case arm
      when AST::Definitions::UnionDefaultArm ;
        out.puts "default:"
      else
        arm.cases.each do |kase|
          if kase.value.is_a?(AST::Identifier)
            if type_string(union.discriminant.type) == "Integer"
              member = union.resolved_case(kase)
              out.puts "case #{member.value}:"
            else
              out.puts "case #{kase.value.name}:"
            end
          else
            out.puts "case #{kase.value.value}:"
          end
        end
    end
    encode_member "encoded#{name union}", arm, out
    out.puts "break;"
  end
  out.puts "}\n}"
  out.puts <<-EOS.strip_heredoc
    public void encode(XdrDataOutputStream stream) throws IOException {
      encode(stream, this);
    }
  EOS

  out.puts "public static #{name union} decode(XdrDataInputStream stream) throws IOException {"
  out.puts "#{name union} decoded#{name union} = new #{name union}();"
  if union.discriminant.type.is_a?(AST::Typespecs::Int)
    out.puts "Integer discriminant = stream.readInt();"
  else
    out.puts "#{name union.discriminant.type} discriminant = #{name union.discriminant.type}.decode(stream);"
  end
  out.puts "decoded#{name union}.setDiscriminant(discriminant);"

  if type_string(union.discriminant.type) == "Uint32"
    # ugly workaround for compile error after generating source for AuthenticatedMessage in stellar-core
    out.puts "switch (decoded#{name union}.getDiscriminant().getUint32()) {"
  else
    out.puts "switch (decoded#{name union}.getDiscriminant()) {"
  end

  union.arms.each do |arm|
    case arm
      when AST::Definitions::UnionDefaultArm ;
        out.puts "default:"
      else
        arm.cases.each do |kase|
          if kase.value.is_a?(AST::Identifier)
            if type_string(union.discriminant.type) == "Integer"
              member = union.resolved_case(kase)
              out.puts "case #{member.value}:"
            else
              out.puts "case #{kase.value.name}:"
            end
          else
            out.puts "case #{kase.value.value}:"
          end
        end
    end
    decode_member "decoded#{name union}", arm, out
    out.puts "break;"
  end
  out.puts "}\n"
  out.indent do
    out.puts "return decoded#{name union};"
  end
  out.puts "}"

  nonVoidArms = union.arms.select { |arm| !arm.void? }

  discriminantPart = if is_type_array(union.discriminant.type)
    "Arrays.hashCode(this.#{union.discriminant.name})"
  else
    "this.#{union.discriminant.name}"
  end

  parts = nonVoidArms.map { |a|
    if is_decl_array(a.declaration)
      "Arrays.hashCode(this.#{a.name})"
    else
      "this.#{a.name}"
    end
  }
  parts.append(discriminantPart)

  hashCodeExpression = "Objects.hashCode(#{parts.join(", ")})"
  out.puts <<-EOS.strip_heredoc
    @Override
    public int hashCode() {
      return #{hashCodeExpression};
    }
  EOS

  equalParts = nonVoidArms.map { |a|
    if is_decl_array(a.declaration)
      "Arrays.equals(this.#{a.name}, other.#{a.name})"
    else
      "Objects.equal(this.#{a.name}, other.#{a.name})"
    end
  }
  equalParts.append(
    if is_type_array(union.discriminant.type)
      "Arrays.equals(this.#{union.discriminant.name}, other.#{union.discriminant.name})"
    else
      "Objects.equal(this.#{union.discriminant.name}, other.#{union.discriminant.name})"
    end
  )

  equalExpression = case equalParts.length
    when 0
      "true"
    else
      equalParts.join(" && ")
  end
  type = name union
  out.puts <<-EOS.strip_heredoc
    @Override
    public boolean equals(Object object) {
      if (!(object instanceof #{type})) {
        return false;
      }

      #{type} other = (#{type}) object;
      return #{equalExpression};
    }
  EOS

  out.break
end

#type_string(type) ⇒ Object 



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# File 'lib/xdrgen/generators/java.rb', line 861

def type_string(type)
  case type
  when AST::Typespecs::Int ;
    "Integer"
  when AST::Typespecs::UnsignedInt ;
    "Integer"
  when AST::Typespecs::Hyper ;
    "Long"
  when AST::Typespecs::UnsignedHyper ;
    "Long"
  when AST::Typespecs::Float ;
    "Float"
  when AST::Typespecs::Double ;
    "Double"
  when AST::Typespecs::Quadruple ;
    raise "cannot render quadruple in golang"
  when AST::Typespecs::Bool ;
    "Boolean"
  when AST::Typespecs::Opaque ;
    "Byte[#{type.size}]"
  when AST::Typespecs::String ;
    "XdrString"
  when AST::Typespecs::Simple ;
    name type.resolved_type
  when AST::Concerns::NestedDefinition ;
    name type
  else
    raise "Unknown typespec: #{type.class.name}"
  end
end