Home | History | Annotate | Download | only in utility 
      1 /*
      2  * Copyright (C) 2009 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 
     17 package com.android.exchange.utility;
     18 
     19 import android.os.Environment;
     20 
     21 import java.io.FileWriter;
     22 import java.io.IOException;
     23 import java.io.PrintWriter;
     24 import java.util.Date;
     25 
     26 public class FileLogger {
     27     private static FileLogger LOGGER = null;
     28     private static FileWriter sLogWriter = null;
     29     public static String LOG_FILE_NAME =
     30         Environment.getExternalStorageDirectory() + "/emaillog.txt";
     31 
     32     public synchronized static FileLogger getLogger() {
     33         LOGGER = new FileLogger();
     34         return LOGGER;
     35     }
     36 
     37     private FileLogger() {
     38         try {
     39             sLogWriter = new FileWriter(LOG_FILE_NAME, true);
     40         } catch (IOException e) {
     41             // Doesn't matter
     42         }
     43     }
     44 
     45     static public synchronized void close() {
     46         if (sLogWriter != null) {
     47             try {
     48                 sLogWriter.close();
     49             } catch (IOException e) {
     50                 // Doesn't matter
     51             }
     52             sLogWriter = null;
     53         }
     54     }
     55 
     56     static public synchronized void log(Exception e) {
     57         if (sLogWriter != null) {
     58             log("Exception", "Stack trace follows...");
     59             PrintWriter pw = new PrintWriter(sLogWriter);
     60             e.printStackTrace(pw);
     61             pw.flush();
     62         }
     63     }
     64 
     65     @SuppressWarnings("deprecation")
     66     static public synchronized void log(String prefix, String str) {
     67         if (LOGGER == null) {
     68             LOGGER = new FileLogger();
     69             log("Logger", "\r\n\r\n --- New Log ---");
     70         }
     71         Date d = new Date();
     72         int hr = d.getHours();
     73         int min = d.getMinutes();
     74         int sec = d.getSeconds();
     75 
     76         // I don't use DateFormat here because (in my experience), it's much slower
     77         StringBuffer sb = new StringBuffer(256);
     78         sb.append('[');
     79         sb.append(hr);
     80         sb.append(':');
     81         if (min < 10)
     82             sb.append('0');
     83         sb.append(min);
     84         sb.append(':');
     85         if (sec < 10) {
     86             sb.append('0');
     87         }
     88         sb.append(sec);
     89         sb.append("] ");
     90         if (prefix != null) {
     91             sb.append(prefix);
     92             sb.append("| ");
     93         }
     94         sb.append(str);
     95         sb.append("\r\n");
     96         String s = sb.toString();
     97 
     98         if (sLogWriter != null) {
     99             try {
    100                 sLogWriter.write(s);
    101                 sLogWriter.flush();
    102             } catch (IOException e) {
    103                 // Something might have happened to the sdcard
    104                 if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
    105                     // If the card is mounted and we can create the writer, retry
    106                     LOGGER = new FileLogger();
    107                     if (sLogWriter != null) {
    108                         try {
    109                             log("FileLogger", "Exception writing log; recreating...");
    110                             log(prefix, str);
    111                         } catch (Exception e1) {
    112                             // Nothing to do at this point
    113                         }
    114                     }
    115                 }
    116             }
    117         }
    118     }
    119 }
    120