*   <li><b>Do not</b> call {@link #doForward} or {@link #doBackward} directly; these exist only to
 *       be overridden.
 * </ul>
 *
 * <h3>Example</h3>
 *
 * <pre>
 *   return new Converter&lt;Integer, String&gt;() {
 *     protected String doForward(Integer i) {
 *       return Integer.toHexString(i);
 *     }
 *
 *     protected Integer doBackward(String s) {
 *       return parseUnsignedInt(s, 16);
 *     }

      new Converter<String, Long>() {
        @Override
        protected Long doForward(String object) {
          return Long.valueOf(object);
        }

        @Override
        protected String doBackward(Long object) {
          return String.valueOf(object);
        }

        @Override
        public String toString() {
          return "string2long";
        }
      };

 *   <li><b>Do not</b> call {@link #doForward} or {@link #doBackward} directly; these exist only to
 *       be overridden.
 * </ul>
 *
 * <h3>Example</h3>
 *
 * <pre>
 *   return new Converter&lt;Integer, String&gt;() {
 *     protected String doForward(Integer i) {
 *       return Integer.toHexString(i);
 *     }
 *
 *     protected Integer doBackward(String s) {
 *       return parseUnsignedInt(s, 16);
 *     }

      new Converter<String, Long>() {
        @Override
        protected Long doForward(String object) {
          return Long.valueOf(object);
        }

        @Override
        protected String doBackward(Long object) {
          return String.valueOf(object);
        }

        @Override
        public String toString() {
          return "string2long";
        }
      };

      this.enumClass = checkNotNull(enumClass);
    }

    @Override
    protected T doForward(String value) {
      return Enum.valueOf(enumClass, value);
    }

    @Override
    protected String doBackward(T enumValue) {
      return enumValue.name();
    }

    @Override
    public boolean equals(@CheckForNull Object object) {
      if (object instanceof StringConverter) {

    }

    @Override
    protected String doForward(String s) {
      return sourceFormat.to(targetFormat, s);
    }

    @Override
    protected String doBackward(String s) {
      return targetFormat.to(sourceFormat, s);
    }

    @Override
    public boolean equals(@CheckForNull Object object) {
      if (object instanceof StringConverter) {

    }

    @Override
    protected String doForward(String s) {
      return sourceFormat.to(targetFormat, s);
    }

    @Override
    protected String doBackward(String s) {
      return targetFormat.to(sourceFormat, s);
    }

    @Override
    public boolean equals(@CheckForNull Object object) {
      if (object instanceof StringConverter) {

      this.enumClass = checkNotNull(enumClass);
    }

    @Override
    protected T doForward(String value) {
      return Enum.valueOf(enumClass, value);
    }

    @Override
    protected String doBackward(T enumValue) {
      return enumValue.name();
    }

    @Override
    public boolean equals(@CheckForNull Object object) {
      if (object instanceof StringConverter) {

    return new Converter<F, T>() {
      @Override
      protected T doForward(F a) {
        return doConvert(convertToType);
      }

      @Override
      protected F doBackward(T b) {
        return doConvert(convertFromType);
      }

      private /*static*/ <S> S doConvert(TypeToken<S> type) {
        return checkNotNull(getDefaultValue(type));
      }
    };
  }

    return new Converter<F, T>() {
      @Override
      protected T doForward(F a) {
        return doConvert(convertToType);
      }

      @Override
      protected F doBackward(T b) {
        return doConvert(convertFromType);
      }

      private /*static*/ <S> S doConvert(TypeToken<S> type) {
        return checkNotNull(getDefaultValue(type));
      }
    };
  }