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Java > Open Source Codes > com > go > trove > log > FileLogStreamFactory


1 /* ====================================================================
2  * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
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52
53 package com.go.trove.log;
54
55 import java.io.*;
56 import java.util.*;
57 import java.text.*;
58
59 /******************************************************************************
60  * Opens up files to be used by an {@link IntervalLogStream}.
61  *
62  * @author Brian S O'Neill
63  * @version
64  * <!--$$Revision:--> 13 <!-- $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
65  */
66 public class FileLogStreamFactory implements IntervalLogStream.Factory {
67     private File mDirectory;
68     private DateFormat mDateFormat;
69     private String JavaDoc mExtension;
70
71     /**
72      * Creates log files in the given directory. The names are created by
73      * appending the name of the directory, a hyphen, a time stamp and
74      * an extension.
75      *
76      * For example, if the directory is "/logs/MyApp", the format is
77      * "yyyyMMdd", and the extension is ".log", then a generated file might be:
78      * "/logs/MyApp/MyApp-19990608.log".
79      *
80      * @param directory Directory to create log files in.
81      * @param format DateFormat to use for creating new file names.
82      * @param extension Extension to put at the end of new file name.
83      */
84     public FileLogStreamFactory(File directory,
85                                 DateFormat format,
86                                 String JavaDoc extension) {
87
88         if (directory == null) {
89             throw new NullPointerException JavaDoc
90                 ("FileLogStreamFactory directory not specified");
91         }
92
93         try {
94             mDirectory = new File(directory.getCanonicalPath());
95         }
96         catch (IOException e) {
97             mDirectory = directory;
98         }
99
100         if (format == null) {
101             throw new NullPointerException JavaDoc
102                 ("FileLogStreamFactory date format not specified");
103         }
104
105         mDateFormat = format;
106
107         if (extension == null) {
108             mExtension = "";
109         }
110         else {
111             mExtension = extension;
112         }
113     }
114
115     public OutputStream openOutputStream(Date date) throws IOException {
116         if (!mDirectory.exists()) {
117             if (!mDirectory.mkdirs()) {
118                 throw new IOException("Unable to create directory: \"" +
119                                       mDirectory + '"');
120             }
121         }
122         
123         String JavaDoc fileName = mDirectory.getName() + '-';
124         synchronized (mDateFormat) {
125             fileName += mDateFormat.format(date);
126         }
127         
128         File file = new File(mDirectory, fileName + mExtension);
129         return new FileOutputStream(file.getPath(), true);
130     }
131 }
132
133
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