Wrote a log formatter for the built-in Java logging that formats things

more readably and concisely.


git-svn-id: https://samskivert.googlecode.com/svn/trunk@1548 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/util/OneLineLogFormatter.java

@@ -0,0 +1,120 @@
+//
+// samskivert library - useful routines for java programs
+// Copyright (C) 2001-2004 Michael Bayne
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library 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
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.samskivert.util;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.Date;
+
+import java.text.FieldPosition;
+import java.text.SimpleDateFormat;
+
+import java.util.logging.Formatter;
+import java.util.logging.Handler;
+import java.util.logging.LogManager;
+import java.util.logging.LogRecord;
+import java.util.logging.Logger;
+import java.util.logging.SimpleFormatter;
+
+/**
+ * A briefer formatter than the default Java {@link SimpleFormatter}.
+ */
+public class OneLineLogFormatter extends Formatter
+{
+    // documentation inherited
+    public String format (LogRecord record)
+    {
+	StringBuffer buf = new StringBuffer();
+
+        // append the timestamp
+        _date.setTime(record.getMillis());
+	_format.format(_date, buf, _fpos);
+
+        // append the log level
+	buf.append(" ");
+	buf.append(record.getLevel().getLocalizedName());
+
+        // append the log method call context
+	buf.append(" ");
+        String where = record.getSourceClassName();
+        boolean legacy = (where.indexOf("LoggingLogProvider") != -1);
+        if (where != null && !legacy) {
+            String logger = record.getLoggerName();
+            if (logger != null && where.startsWith(logger)) {
+                where = where.substring(logger.length()+1);
+            }
+        } else {
+            where = record.getLoggerName();
+        }
+        buf.append(where);
+	if (record.getSourceMethodName() != null && !legacy) {
+	    buf.append(".");
+	    buf.append(record.getSourceMethodName());
+	}
+
+        // append the message itself
+	buf.append(": ");
+	buf.append(formatMessage(record));
+        buf.append(LINE_SEPARATOR);
+
+        // if an exception was also provided, append that
+	if (record.getThrown() != null) {
+	    try {
+	        StringWriter sw = new StringWriter();
+	        PrintWriter pw = new PrintWriter(sw);
+	        record.getThrown().printStackTrace(pw);
+	        pw.close();
+		buf.append(sw.toString());
+	    } catch (Exception ex) {
+	    }
+	}
+
+	return buf.toString();
+    }
+
+    /**
+     * Configures the default logging handler to use an instance of this
+     * formatter when formatting messages.
+     */
+    public static void configureDefaultHandler ()
+    {
+        Logger logger = LogManager.getLogManager().getLogger("");
+        Handler[] handlers = logger.getHandlers();
+        OneLineLogFormatter formatter = new OneLineLogFormatter();
+        for (int ii = 0; ii < handlers.length; ii++) {
+            handlers[ii].setFormatter(formatter);
+        }
+    }
+
+    protected Date _date = new Date();
+    protected SimpleDateFormat _format =
+        new SimpleDateFormat("yyyy/MM/dd HH:mm:ss:SSS");
+    protected FieldPosition _fpos =
+        new FieldPosition(SimpleDateFormat.DATE_FIELD);
+
+    protected static String LINE_SEPARATOR = "\n";
+    protected static final String DATE_FORMAT = "{0,date} {0,time}";
+
+    static {
+        try {
+            LINE_SEPARATOR = System.getProperty("line.separator");
+        } catch (Exception e) {
+        }
+    }
+}