RollingDateFileHandler


1   package org.jzonic.jlo.handler;
2   
3   import java.io.*;
4   import java.text.SimpleDateFormat  ;
5   import java.util.Date  ;
6   import java.util.Map  ;
7   
8   import org.jzonic.jlo.LogRecord;
9   import org.jzonic.jlo.error.ErrorHandler;
10  
11  // Referenced classes of package org.jlo.handler:
12  //            Handler
13  
14  public class RollingDateFileHandler extends AbstractHandler {
15  
16      private String   fileName;
17      private int maxSize;
18      private String   dateFormat;
19  
20      /**
21       * 
22       */
23      public RollingDateFileHandler(String   configName) {
24          super(configName);
25          fileName = null;
26          maxSize = -1;
27          dateFormat = "dd.MM.yyyy";
28      }
29  
30      /**
31       * 
32       * @param msg 
33       */
34      public void publish(String   msg) {
35          String   fn = prepareFileName();
36          if (fileName == null )
37              ErrorHandler.reportError("No filename specified");
38          try {           
39              File file = new File(fn);
40              boolean append = true;
41              if ( file.exists() && maxSize != -1 ) {
42                  long length = file.length();
43                  if ( length > maxSize*1024 ) {
44                      append = false;
45                  }
46              }
47              FileWriter fw = new FileWriter(fn, append);
48              fw.write(msg + "\n");
49              fw.close();
50          } catch (Exception   e) {
51              ErrorHandler.reportError(
52                  "Exception while trying to write to file: " + fn,
53                  e);
54          }
55      }
56  
57      /**
58       * 
59       * @param lr 
60       */
61      public void publish(LogRecord lr) {
62          publish(lr.getMessage());
63      }
64  
65      /**
66       * Sets the parameters. The required parameters are:<br/>
67           *
68       * @param parameters 
69       */       
70      public void setParameter(Map   parameters) {
71          if (parameters.containsKey("file"))
72              fileName = (String  ) parameters.get("file");
73          if (parameters.containsKey("maxsize"))
74              maxSize = Integer.parseInt((String  ) parameters.get("maxsize"));
75          if (parameters.containsKey("format"))
76              dateFormat = (String  ) parameters.get("format");
77      }
78  
79      private String   prepareFileName() {
80          if (fileName != null) {
81              String   tmpName = fileName.toLowerCase();
82              int pos = tmpName.indexOf("${date}");
83              if (pos == -1) {
84                  return fileName;
85              } else {
86                  Date   rightNow = new Date  (System.currentTimeMillis());
87                  String   firstPart = fileName.substring(0, pos - 1);
88                  String   secondPart = fileName.substring(pos + 7);
89                  SimpleDateFormat   formatter = new SimpleDateFormat  (dateFormat);
90                  String   dateString = formatter.format(rightNow);
91                  return firstPart + dateString + secondPart;
92              }
93          } else {
94              return null;
95          }
96      }
97  
98  }
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