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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/util/logging/ErrorManager.java
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+/* ErrorManager.java --
+ A class for dealing with errors that a Handler encounters
+ during logging
+ Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.util.logging;
+
+/**
+ * An <code>ErrorManager</code> deals with errors that a <code>Handler</code>
+ * encounters while logging.
+ *
+ * @see Handler#setErrorManager(ErrorManager)
+ *
+ * @author Sascha Brawer (brawer@acm.org)
+ */
+public class ErrorManager
+{
+ /* The values have been taken from Sun's public J2SE 1.4 API
+ * documentation.
+ * See http://java.sun.com/j2se/1.4/docs/api/constant-values.html
+ */
+
+ /**
+ * Indicates that there was a failure that does not readily
+ * fall into any of the other categories.
+ */
+ public static final int GENERIC_FAILURE = 0;
+
+
+ /**
+ * Indicates that there was a problem upon writing to
+ * an output stream.
+ */
+ public static final int WRITE_FAILURE = 1;
+
+
+ /**
+ * Indicates that there was a problem upon flushing
+ * an output stream.
+ */
+ public static final int FLUSH_FAILURE = 2;
+
+
+ /**
+ * Indicates that there was a problem upon closing
+ * an output stream.
+ */
+ public static final int CLOSE_FAILURE = 3;
+
+
+ /**
+ * Indicates that there was a problem upon opening
+ * an output stream.
+ */
+ public static final int OPEN_FAILURE = 4;
+
+
+ /**
+ * Indicates that there was a problem upon formatting
+ * the message of a log record.
+ */
+ public static final int FORMAT_FAILURE = 5;
+
+
+ /**
+ * Indicates whether the {@link #error} method of this ErrorManager
+ * has ever been used.
+ *
+ * Declared volatile in order to correctly support the
+ * double-checked locking idiom (once the revised Java Memory Model
+ * gets adopted); see Classpath bug #2944.
+ */
+ private volatile boolean everUsed = false;
+
+
+ public ErrorManager()
+ {
+ }
+
+
+ /**
+ * Reports an error that occured upon logging. The default implementation
+ * emits the very first error to System.err, ignoring subsequent errors.
+ *
+ * @param message a message describing the error, or <code>null</code> if
+ * there is no suitable description.
+ *
+ * @param ex an exception, or <code>null</code> if the error is not
+ * related to an exception.
+ *
+ * @param errorCode one of the defined error codes, for example
+ * <code>ErrorManager.CLOSE_FAILURE</code>.
+ */
+ public void error(String message, Exception ex, int errorCode)
+ {
+ if (everUsed)
+ return;
+
+ synchronized (this)
+ {
+ /* The double check is intentional. If the first check was
+ * omitted, the monitor would have to be entered every time
+ * error() method was called. If the second check was
+ * omitted, the code below could be executed by multiple
+ * threads simultaneously.
+ *
+ * This is the 'double-checked locking' idiom, which is broken
+ * with the current version of the Java memory model. However,
+ * we assume that JVMs will have adopted a revised version of
+ * the Java Memory Model by the time GNU Classpath gains
+ * widespread acceptance. See Classpath bug #2944.
+ */
+ if (everUsed)
+ return;
+
+ everUsed = true;
+ }
+
+ String codeMsg;
+ switch (errorCode)
+ {
+ case GENERIC_FAILURE:
+ codeMsg = "GENERIC_FAILURE";
+ break;
+
+ case WRITE_FAILURE:
+ codeMsg = "WRITE_FAILURE";
+ break;
+
+ case FLUSH_FAILURE:
+ codeMsg = "FLUSH_FAILURE";
+ break;
+
+ case CLOSE_FAILURE:
+ codeMsg = "CLOSE_FAILURE";
+ break;
+
+ case OPEN_FAILURE:
+ codeMsg = "OPEN_FAILURE";
+ break;
+
+ case FORMAT_FAILURE:
+ codeMsg = "FORMAT_FAILURE";
+ break;
+
+ default:
+ codeMsg = String.valueOf(errorCode);
+ break;
+ }
+
+ System.err.println("Error upon logging: " + codeMsg);
+ if ((message != null) && (message.length() > 0))
+ System.err.println(message);
+
+ if (ex != null)
+ ex.printStackTrace();
+ }
+}