content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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
   *
   *      http://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 com.alibaba.nacos.common.utils;
  
  import java.io.ByteArrayOutputStream;
  import java.io.PrintStream;
  import java.util.Objects;
  
  /**
   * Common methods for exception.
   *
   * @author nkorange
   * @since 1.2.0
   */
  public class ExceptionUtil {
  
      private ExceptionUtil() {
      }
      
      /**
       * Represents an empty exception, that is, no exception occurs, only a constant.
       */
      public static final Exception NONE_EXCEPTION = new RuntimeException("");
      
      public static String getAllExceptionMsg(Throwable e) {
          Throwable cause = e;
          StringBuilder strBuilder = new StringBuilder();
          
          while (cause != null && !StringUtils.isEmpty(cause.getMessage())) {
              strBuilder.append("caused: ").append(cause.getMessage()).append(';');
              cause = cause.getCause();
          }
          
          return strBuilder.toString();
      }
      
      public static Throwable getCause(final Throwable t) {
          final Throwable cause = t.getCause();
          if (Objects.isNull(cause)) {
              return t;
          }
          return cause;
      }
      
      public static String getStackTrace(final Throwable t) {
          if (t == null) {
              return "";
          }
          
          final ByteArrayOutputStream out = new ByteArrayOutputStream();
          final PrintStream ps = new PrintStream(out);
          t.printStackTrace(ps);
          ps.flush();
          return out.toString();
      }
  }
  