/*
 * Loads a class and verifies that the main class is present and it is ok to
 * call it for more details refer to the java implementation.
 */

static jclass
LoadMainClass(JNIEnv *env, int mode, char *name)
{

  {- -------------------------------------------
  (1) (変数宣言など)
      ---------------------------------------- -}

        jmethodID mid;
        jstring str;
        jobject result;
        jlong start, end;

  {- -------------------------------------------
  (1) ブートストラップクラスローダーを使って "sun.launcher.LauncherHelper" クラスを取得する.
      (もし結果が NULL だったら, ここでリターン)
      ---------------------------------------- -}

        jclass cls = GetLauncherHelperClass(env);
        NULL_CHECK0(cls);

  {- -------------------------------------------
  (1) (トレース出力用の処理)
      ---------------------------------------- -}

        if (JLI_IsTraceLauncher()) {
            start = CounterGet();
        }

  {- -------------------------------------------
  (1) 取得した sun.launcher.LauncherHelper クラス内から, checkAndLoadMain() メソッドを取得する.
      (もし結果が NULL だったら, ここでリターン)
      ---------------------------------------- -}

        NULL_CHECK0(mid = (*env)->GetStaticMethodID(env, cls,
                    "checkAndLoadMain",
                    "(ZILjava/lang/String;)Ljava/lang/Class;"));

  {- -------------------------------------------
  (1) 取得した sun.launcher.LauncherHelper.checkAndLoadMain() メソッドを呼び出す.
      ---------------------------------------- -}

        switch (mode) {
            case LM_CLASS:
                str = NewPlatformString(env, name);
                break;
            default:
                str = (*env)->NewStringUTF(env, name);
                break;
        }
        result = (*env)->CallStaticObjectMethod(env, cls, mid, USE_STDERR, mode, str);

  {- -------------------------------------------
  (1) (トレース出力)
      ---------------------------------------- -}

        if (JLI_IsTraceLauncher()) {
            end   = CounterGet();
            printf("%ld micro seconds to load main class\n",
                   (long)(jint)Counter2Micros(end-start));
            printf("----_JAVA_LAUNCHER_DEBUG----\n");
        }

  {- -------------------------------------------
  (1) 結果をリターン
      ---------------------------------------- -}

        return (jclass)result;
    }