content: /*
   * Copyright (C) 2013 The Android Open Source Project
   *
   * 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.example.android.common.logger;
  
  import android.app.Activity;
  import android.content.Context;
  import android.util.AttributeSet;
  
  import androidx.appcompat.widget.AppCompatTextView;
  
  /**
   * Simple TextView which is used to output log data received through the LogNode interface.
   */
  public class LogView extends AppCompatTextView implements LogNode {
  
      public LogView(Context context) {
          super(context);
      }
  
      public LogView(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      public LogView(Context context, AttributeSet attrs, int defStyle) {
          super(context, attrs, defStyle);
      }
  
      /**
       * Formats the log data and prints it out to the LogView.
       *
       * @param priority Log level of the data being logged.  Verbose, Error, etc.
       * @param tag      Tag for for the log data.  Can be used to organize log statements.
       * @param msg      The actual message to be logged. The actual message to be logged.
       * @param tr       If an exception was thrown, this can be sent along for the logging facilities
       *                 to extract and print useful information.
       */
      @Override
      public void println(int priority, String tag, String msg, Throwable tr) {
  
  
          String priorityStr = null;
  
          // For the purposes of this View, we want to print the priority as readable text.
          switch (priority) {
              case android.util.Log.VERBOSE:
                  priorityStr = "VERBOSE";
                  break;
              case android.util.Log.DEBUG:
                  priorityStr = "DEBUG";
                  break;
              case android.util.Log.INFO:
                  priorityStr = "INFO";
                  break;
              case android.util.Log.WARN:
                  priorityStr = "WARN";
                  break;
              case android.util.Log.ERROR:
                  priorityStr = "ERROR";
                  break;
              case android.util.Log.ASSERT:
                  priorityStr = "ASSERT";
                  break;
              default:
                  break;
          }
  
          // Handily, the Log class has a facility for converting a stack trace into a usable string.
          String exceptionStr = null;
          if (tr != null) {
              exceptionStr = android.util.Log.getStackTraceString(tr);
          }
  
          // Take the priority, tag, message, and exception, and concatenate as necessary
          // into one usable line of text.
          final StringBuilder outputBuilder = new StringBuilder();
  
          String delimiter = "\t";
          appendIfNotNull(outputBuilder, priorityStr, delimiter);
          appendIfNotNull(outputBuilder, tag, delimiter);
          appendIfNotNull(outputBuilder, msg, delimiter);
          appendIfNotNull(outputBuilder, exceptionStr, delimiter);
  
          // In case this was originally called from an AsyncTask or some other off-UI thread,
          // make sure the update occurs within the UI thread.
          ((Activity) getContext()).runOnUiThread((new Thread(new Runnable() {
              @Override
              public void run() {
                  // Display the text we just generated within the LogView.
                  appendToLog(outputBuilder.toString());
              }
          })));
  
          if (mNext != null) {
              mNext.println(priority, tag, msg, tr);
          }
      }
  
      public LogNode getNext() {
          return mNext;
      }
  
      public void setNext(LogNode node) {
          mNext = node;
      }
  
      /**
       * Takes a string and adds to it, with a separator, if the bit to be added isn't null. Since
       * the logger takes so many arguments that might be null, this method helps cut out some of the
       * agonizing tedium of writing the same 3 lines over and over.
       *
       * @param source    StringBuilder containing the text to append to.
       * @param addStr    The String to append
       * @param delimiter The String to separate the source and appended strings. A tab or comma,
       *                  for instance.
       * @return The fully concatenated String as a StringBuilder
       */
      private StringBuilder appendIfNotNull(StringBuilder source, String addStr, String delimiter) {
          if (addStr != null) {
              if (addStr.length() == 0) {
                  delimiter = "";
              }
  
              return source.append(addStr).append(delimiter);
          }
          return source;
      }
  
      // The next LogNode in the chain.
      LogNode mNext;
  
      /**
       * Outputs the string as a new line of log data in the LogView.
       */
      public void appendToLog(String s) {
          append("\n" + s);
      }
  
  
  }
  