private Constructor getConstructor()

in src/main/java/feign/error/ExceptionGenerator.java [187:219]

31 lines of code
7 McCabe index (conditional complexity)


    private Constructor<? extends Exception> getConstructor(Class<? extends Exception> exceptionClass) {
      Constructor<? extends Exception> preferredConstructor = null;
      for (Constructor<?> constructor : exceptionClass.getConstructors()) {

        FeignExceptionConstructor exceptionConstructor =
            constructor.getAnnotation(FeignExceptionConstructor.class);
        if (exceptionConstructor == null) {
          continue;
        }
        Class<?>[] parameterTypes = constructor.getParameterTypes();
        if (parameterTypes.length == 0) {
          continue;
        }
        if (preferredConstructor == null) {
          preferredConstructor = (Constructor<? extends Exception>) constructor;
        } else {
          throw new IllegalStateException(
              "Too many constructors marked with @FeignExceptionConstructor");
        }
      }

      if (preferredConstructor == null) {
        try {
          return exceptionClass.getConstructor();
        } catch (NoSuchMethodException e) {
          throw new IllegalStateException(
              "Cannot find any suitable constructor in class [" + exceptionClass.getName()
                  + "] - did you forget to mark one with @FeignExceptionConstructor or at least have a public default constructor?",
              e);
        }
      }
      return preferredConstructor;
    }