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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.example.android.common.logger;
     17 
     18 /**
     19  * Basic interface for a logging system that can output to one or more targets.
     20  * Note that in addition to classes that will output these logs in some format,
     21  * one can also implement this interface over a filter and insert that in the chain,
     22  * such that no targets further down see certain data, or see manipulated forms of the data.
     23  * You could, for instance, write a "ToHtmlLoggerNode" that just converted all the log data
     24  * it received to HTML and sent it along to the next node in the chain, without printing it
     25  * anywhere.
     26  */
     27 public interface LogNode {
     28 
     29     /**
     30      * Instructs first LogNode in the list to print the log data provided.
     31      * @param priority Log level of the data being logged.  Verbose, Error, etc.
     32      * @param tag Tag for for the log data.  Can be used to organize log statements.
     33      * @param msg The actual message to be logged. The actual message to be logged.
     34      * @param tr If an exception was thrown, this can be sent along for the logging facilities
     35      *           to extract and print useful information.
     36      */
     37     public void println(int priority, String tag, String msg, Throwable tr);
     38 
     39 }
     40