content: /*
   * Copyright (C) 2012 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;
  
  /**
   * Basic interface for a logging system that can output to one or more targets.
   * Note that in addition to classes that will output these logs in some format,
   * one can also implement this interface over a filter and insert that in the chain,
   * such that no targets further down see certain data, or see manipulated forms of the data.
   * You could, for instance, write a "ToHtmlLoggerNode" that just converted all the log data
   * it received to HTML and sent it along to the next node in the chain, without printing it
   * anywhere.
   */
  public interface LogNode {
  
      /**
       * Instructs first LogNode in the list to print the log data provided.
       * @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.
       */
      public void println(int priority, String tag, String msg, Throwable tr);
  
  }
  