/*
    * 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.logging.log4j.message;
  
  /**
   * Generates information about the current Thread. Used internally by ThreadDumpMessage.
   */
  class BasicThreadInformation implements ThreadInformation {
      private static final int HASH_SHIFT = 32;
      private static final int HASH_MULTIPLIER = 31;
      private final long id;
      private final String name;
      private final String longName;
      private final Thread.State state;
      private final int priority;
      private final boolean isAlive;
      private final boolean isDaemon;
      private final String threadGroupName;
  
      /**
       * The Constructor.
       * @param thread The Thread to capture.
       */
      public BasicThreadInformation(final Thread thread) {
          this.id = thread.getId();
          this.name = thread.getName();
          this.longName = thread.toString();
          this.state = thread.getState();
          this.priority = thread.getPriority();
          this.isAlive = thread.isAlive();
          this.isDaemon = thread.isDaemon();
          final ThreadGroup group = thread.getThreadGroup();
          threadGroupName = group == null ? null : group.getName();
      }
  
      @Override
      public boolean equals(final Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
  
          final BasicThreadInformation that = (BasicThreadInformation) o;
  
          if (id != that.id) {
              return false;
          }
          if (name != null ? !name.equals(that.name) : that.name != null) {
              return false;
          }
  
          return true;
      }
  
      @Override
      public int hashCode() {
          int result = (int) (id ^ (id >>> HASH_SHIFT));
          result = HASH_MULTIPLIER * result + (name != null ? name.hashCode() : 0);
          return result;
      }
  
      /**
       * Print the thread information.
       * @param sb The StringBuilder.
       */
      @Override
      public void printThreadInfo(final StringBuilder sb) {
          sb.append('"').append(name).append("\" ");
          if (isDaemon) {
              sb.append("daemon ");
          }
          sb.append("prio=").append(priority).append(" tid=").append(id).append(' ');
          if (threadGroupName != null) {
              sb.append("group=\"").append(threadGroupName).append('"');
          }
          sb.append('\n');
          sb.append("\tThread state: ").append(state.name()).append('\n');
      }
  
      /**
       * Format the StackTraceElements.
       * @param sb The StringBuilder.
       * @param trace The stack trace element array to format.
      */
     @Override
     public void printStack(final StringBuilder sb, final StackTraceElement[] trace) {
         for (final StackTraceElement element : trace) {
             sb.append("\tat ").append(element).append('\n');
         }
     }
 }