content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF 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
   *
   *     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 org.apache.cassandra.utils.concurrent;
  
  import java.util.Collections;
  import java.util.Set;
  import java.util.function.BiConsumer;
  import java.util.function.BinaryOperator;
  import java.util.function.Function;
  import java.util.function.Supplier;
  import java.util.stream.Collector;
  import java.util.stream.Stream;
  
  public class Threads
  {
      public static class StackTraceCombiner implements Collector<StackTraceElement, StringBuilder, String>, Supplier<StringBuilder>, Function<StringBuilder, String>
      {
          final boolean printBriefPackages;
          final String prefix;
          final String delimiter;
          final String suffix;
  
          public StackTraceCombiner(boolean printBriefPackages, String prefix, String delimiter, String suffix)
          {
              this.printBriefPackages = printBriefPackages;
              this.prefix = prefix;
              this.delimiter = delimiter;
              this.suffix = suffix;
          }
  
          public Supplier<StringBuilder> supplier()
          {
  
              return this;
          }
  
          public BiConsumer<StringBuilder, StackTraceElement> accumulator()
          {
              return (sb, ste) ->
              {
                  if (sb.length() > prefix.length())
                      sb.append(delimiter);
  
                  String className = ste.getClassName();
  
                  if (printBriefPackages)
                  {
                      int afterPrevDot = 0;
                      while (true)
                      {
                          int dot = className.indexOf('.', afterPrevDot);
                          if (dot < 0)
                              break;
  
                          sb.append(className.charAt(afterPrevDot));
                          sb.append('.');
                          afterPrevDot = dot + 1;
                      }
                      sb.append(className, afterPrevDot, className.length());
                  }
                  else
                  {
                      sb.append(className);
                  }
                  sb.append('.');
                  sb.append(ste.getMethodName());
                  sb.append(':');
                  sb.append(ste.getLineNumber());
              };
          }
  
          public BinaryOperator<StringBuilder> combiner()
          {
              return (sb1, sb2) -> sb1.append("; ").append(sb2);
          }
  
          public Function<StringBuilder, String> finisher()
          {
              return this;
          }
  
          public Set<Characteristics> characteristics()
          {
              return Collections.emptySet();
          }
  
          public StringBuilder get()
          {
              return new StringBuilder(prefix);
          }
  
          public String apply(StringBuilder finish)
          {
              finish.append(suffix);
              return finish.toString();
          }
      }
  
      public static String prettyPrintStackTrace(Thread thread, boolean printBriefPackages, String delimiter)
      {
          return prettyPrint(thread.getStackTrace(), printBriefPackages, delimiter);
      }
  
      public static String prettyPrintStackTrace(Thread thread, boolean printBriefPackages, String prefix, String delimiter, String suffix)
      {
          return prettyPrint(thread.getStackTrace(), printBriefPackages, prefix, delimiter, suffix);
      }
  
      public static String prettyPrint(StackTraceElement[] st, boolean printBriefPackages, String delimiter)
      {
          return prettyPrint(st, printBriefPackages, "", delimiter, "");
      }
  
      public static String prettyPrint(StackTraceElement[] st, boolean printBriefPackages, String prefix, String delimiter, String suffix)
      {
          return Stream.of(st).collect(new StackTraceCombiner(printBriefPackages, prefix, delimiter, suffix));
      }
  
      public static String prettyPrint(Stream<StackTraceElement> st, boolean printBriefPackages, String prefix, String delimiter, String suffix)
      {
          return st.collect(new StackTraceCombiner(printBriefPackages, prefix, delimiter, suffix));
      }
  
  }
  