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8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
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11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
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17  * You should have received a copy of the GNU General Public License version
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19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24  */
25 
26 
27 package java.util.logging;
28 
29 /**
30  * ErrorManager objects can be attached to Handlers to process
31  * any error that occurs on a Handler during Logging.
32  * <p>
33  * When processing logging output, if a Handler encounters problems
34  * then rather than throwing an Exception back to the issuer of
35  * the logging call (who is unlikely to be interested) the Handler
36  * should call its associated ErrorManager.
37  */
38 
39 public class ErrorManager {
40    private boolean reported = false;
41 
42     /*
43      * We declare standard error codes for important categories of errors.
44      */
45 
46     /**
47      * GENERIC_FAILURE is used for failure that don't fit
48      * into one of the other categories.
49      */
50     public final static int GENERIC_FAILURE = 0;
51     /**
52      * WRITE_FAILURE is used when a write to an output stream fails.
53      */
54     public final static int WRITE_FAILURE = 1;
55     /**
56      * FLUSH_FAILURE is used when a flush to an output stream fails.
57      */
58     public final static int FLUSH_FAILURE = 2;
59     /**
60      * CLOSE_FAILURE is used when a close of an output stream fails.
61      */
62     public final static int CLOSE_FAILURE = 3;
63     /**
64      * OPEN_FAILURE is used when an open of an output stream fails.
65      */
66     public final static int OPEN_FAILURE = 4;
67     /**
68      * FORMAT_FAILURE is used when formatting fails for any reason.
69      */
70     public final static int FORMAT_FAILURE = 5;
71 
72     /**
73      * The error method is called when a Handler failure occurs.
74      * <p>
75      * This method may be overridden in subclasses.  The default
76      * behavior in this base class is that the first call is
77      * reported to System.err, and subsequent calls are ignored.
78      *
79      * @param msg    a descriptive string (may be null)
80      * @param ex     an exception (may be null)
81      * @param code   an error code defined in ErrorManager
82      */
error(String msg, Exception ex, int code)83     public synchronized void error(String msg, Exception ex, int code) {
84         if (reported) {
85             // We only report the first error, to avoid clogging
86             // the screen.
87             return;
88         }
89         reported = true;
90         String text = "java.util.logging.ErrorManager: " + code;
91         if (msg != null) {
92             text = text + ": " + msg;
93         }
94         System.err.println(text);
95         if (ex != null) {
96             ex.printStackTrace();
97         }
98     }
99 }
100