src/share/classes/java/util/logging/SimpleFormatter.java

/*
 * Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package java.util.logging;

import java.io.*;
import java.text.*;
import java.util.Date;

/**
 * Print a brief summary of the LogRecord in a human readable
 * format.  The summary will typically be 1 or 2 lines.
 *
 * @since 1.4
 */

public class SimpleFormatter extends Formatter {

    Date dat = new Date();
    private final static String format = "{0,date} {0,time}";
    private MessageFormat formatter;

    private Object args[] = new Object[1];

    // Line separator string.  This is the value of the line.separator
    // property at the moment that the SimpleFormatter was created.
    private String lineSeparator = java.security.AccessController.doPrivileged(
               new sun.security.action.GetPropertyAction("line.separator"));

    /**
     * Format the given LogRecord.
     * <p>
     * This method can be overridden in a subclass.
     * It is recommended to use the {@link Formatter#formatMessage}
     * convenience method to localize and format the message field.
     *
     * @param record the log record to be formatted.
     * @return a formatted log record
     */
    public synchronized String format(LogRecord record) {
        StringBuffer sb = new StringBuffer();
        // Minimize memory allocations here.
        dat.setTime(record.getMillis());
        args[0] = dat;
        StringBuffer text = new StringBuffer();
        if (formatter == null) {
            formatter = new MessageFormat(format);
        }
        formatter.format(args, text, null);
        sb.append(text);
        sb.append(" ");
        if (record.getSourceClassName() != null) {
            sb.append(record.getSourceClassName());
        } else {
            sb.append(record.getLoggerName());
        }
        if (record.getSourceMethodName() != null) {
            sb.append(" ");
            sb.append(record.getSourceMethodName());
        }
        sb.append(lineSeparator);
        String message = formatMessage(record);
        sb.append(record.getLevel().getLocalizedName());
        sb.append(": ");
        sb.append(message);
        sb.append(lineSeparator);
        if (record.getThrown() != null) {
            try {
                StringWriter sw = new StringWriter();
                PrintWriter pw = new PrintWriter(sw);
                record.getThrown().printStackTrace(pw);
                pw.close();
                sb.append(sw.toString());
            } catch (Exception ex) {
            }
        }
        return sb.toString();
    }
}