44 public final class ModuleInfoWriter {
  45 
  46     private ModuleInfoWriter() { }
  47 
  48     /**
  49      * Writes the given module descriptor to a module-info.class file,
  50      * returning it in a byte array.
  51      */
  52     private static byte[] toModuleInfo(ModuleDescriptor descriptor) {
  53 
  54         ClassWriter cw = new ClassWriter(0);
  55 
  56         String name = descriptor.name().replace('.', '/') + "/module-info";
  57         cw.visit(Opcodes.V1_8, ACC_MODULE, name, null, null, null);
  58 
  59         cw.visitAttribute(new ModuleAttribute(descriptor));
  60         cw.visitAttribute(new ConcealedPackagesAttribute(descriptor.conceals()));
  61 
  62         Optional<Version> oversion = descriptor.version();
  63         if (oversion.isPresent())
  64             cw.visitAttribute(new VersionAttribute(oversion.get()));
  65 
  66         Optional<String> omain = descriptor.mainClass();
  67         if (omain.isPresent())
  68             cw.visitAttribute(new MainClassAttribute(omain.get()));
  69 
  70         // write the TargetPlatform attribute if have any of OS name/arch/version
  71         String osName = descriptor.osName().orElse(null);
  72         String osArch = descriptor.osArch().orElse(null);
  73         String osVersion = descriptor.osVersion().orElse(null);
  74         if (osName != null || osArch != null || osVersion != null) {
  75             cw.visitAttribute(new TargetPlatformAttribute(osName,
  76                                                           osArch,
  77                                                           osVersion));
  78         }
  79 
  80         cw.visitEnd();
  81 
  82         return cw.toByteArray();
  83     }
  84 
  85     /**
  86      * Writes a module descriptor to the given output stream as a
  87      * module-info.class.
  88      */

  44 public final class ModuleInfoWriter {
  45 
  46     private ModuleInfoWriter() { }
  47 
  48     /**
  49      * Writes the given module descriptor to a module-info.class file,
  50      * returning it in a byte array.
  51      */
  52     private static byte[] toModuleInfo(ModuleDescriptor descriptor) {
  53 
  54         ClassWriter cw = new ClassWriter(0);
  55 
  56         String name = descriptor.name().replace('.', '/') + "/module-info";
  57         cw.visit(Opcodes.V1_8, ACC_MODULE, name, null, null, null);
  58 
  59         cw.visitAttribute(new ModuleAttribute(descriptor));
  60         cw.visitAttribute(new ConcealedPackagesAttribute(descriptor.conceals()));
  61 
  62         Optional<Version> oversion = descriptor.version();
  63         if (oversion.isPresent())
  64             cw.visitAttribute(new VersionAttribute(oversion.getWhenPresent()));
  65 
  66         Optional<String> omain = descriptor.mainClass();
  67         if (omain.isPresent())
  68             cw.visitAttribute(new MainClassAttribute(omain.getWhenPresent()));
  69 
  70         // write the TargetPlatform attribute if have any of OS name/arch/version
  71         String osName = descriptor.osName().orElse(null);
  72         String osArch = descriptor.osArch().orElse(null);
  73         String osVersion = descriptor.osVersion().orElse(null);
  74         if (osName != null || osArch != null || osVersion != null) {
  75             cw.visitAttribute(new TargetPlatformAttribute(osName,
  76                                                           osArch,
  77                                                           osVersion));
  78         }
  79 
  80         cw.visitEnd();
  81 
  82         return cw.toByteArray();
  83     }
  84 
  85     /**
  86      * Writes a module descriptor to the given output stream as a
  87      * module-info.class.
  88      */