/*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty5.handler.codec;
  
  import static java.util.Objects.requireNonNull;
  
  public class DecoderResult {
  
      private static final DecoderResult SUCCESS = new DecoderResult();
  
      public static DecoderResult failure(Throwable cause) {
          requireNonNull(cause, "cause");
          return new DecoderResult(cause);
      }
  
      public static DecoderResult success() {
          return SUCCESS;
      }
  
      private final Throwable cause;
  
      protected DecoderResult(Throwable cause) {
          this.cause = requireNonNull(cause, "cause");
      }
  
      protected DecoderResult() {
          this.cause = null;
      }
  
      public final boolean isSuccess() {
          return cause == null;
      }
  
      public final boolean isFailure() {
          return cause != null;
      }
  
      public final Throwable cause() {
          return cause;
      }
  
      @Override
      public String toString() {
          if (isSuccess()) {
              return "success";
          }
  
          String cause = cause().toString();
          return new StringBuilder(cause.length() + 17)
                  .append("failure(")
                  .append(cause)
                  .append(')')
                  .toString();
      }
  }