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HSQLDB example source code file (SimpleLog.java)

This example HSQLDB source code file (SimpleLog.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - HSQLDB tags/keywords

exception, file, io, log_error, log_none, log_none, log_normal, printwriter, printwriter, simplelog, stacktraceelement, string, string, throwable, throwable

The HSQLDB SimpleLog.java source code

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


package org.hsqldb.lib;

import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;

import org.hsqldb.HsqlDateTime;

/**
 * Simple log for recording abnormal events in persistence<p>
 * Log levels, LOG_NONE, LOG_ERROR, and LOG_NORMAL are currently supported.<p>
 * LOG_ERROR corresponds to property value 1 and logs main database events plus
 * any major errors encountered in operation.
 * LOG_NORMAL corresponds to property value 2 and logs additional normal events
 * and minor errors.
 *
 * @author fredt@users
 * @version 1.8.0
 * @since 1.8.0
 */
public class SimpleLog {

    public static final int LOG_NONE   = 0;
    public static final int LOG_ERROR  = 1;
    public static final int LOG_NORMAL = 2;
    private PrintWriter     writer;
    private int             level;
    private boolean         isSystem;

    public SimpleLog(String path, int level, boolean useFile) {

        this.level = level;

        if (level != LOG_NONE) {
            if (useFile) {
                File file = new File(path);

                makeLog(file);
            } else {
                isSystem = true;
                writer = new PrintWriter(System.out);
            }
        }
    }

    private void makeLog(File file) {

        try {
            FileUtil.getDefaultInstance().makeParentDirectories(file);

            writer = new PrintWriter(new FileWriter(file.getPath(), true),
                                     true);
        } catch (Exception e) {
            isSystem = true;
            writer = new PrintWriter(System.out);
        }
    }

    public int getLevel() {
        return level;
    }

    public PrintWriter getPrintWriter() {
        return writer;
    }

    public synchronized void sendLine(int atLevel, String message) {

        if (level >= atLevel) {
            writer.println(HsqlDateTime.getSytemTimeString() + " " + message);
        }
    }

    public synchronized void logContext(int atLevel, String message) {

        if (level < atLevel) {
            return;
        }

        String info = HsqlDateTime.getSytemTimeString();

//#ifdef JAVA4
        Throwable           temp     = new Throwable();
        StackTraceElement[] elements = temp.getStackTrace();

        if (elements.length > 1) {
            info += " " + elements[1].getClassName() + "."
                    + elements[1].getMethodName();
        }

//#endif JAVA4
        writer.println(info + " " + message);
    }

    public synchronized void logContext(Throwable t, String message) {

        if (level == LOG_NONE) {
            return;
        }

        String info = HsqlDateTime.getSytemTimeString();

//#ifdef JAVA4
        Throwable           temp     = new Throwable();
        StackTraceElement[] elements = temp.getStackTrace();

        if (elements.length > 1) {
            info += " " + elements[1].getClassName() + "."
                    + elements[1].getMethodName();
        }

        elements = t.getStackTrace();

        if (elements.length > 0) {
            info += " " + elements[0].getClassName() + "."
                    + elements[0].getMethodName();
        }

//#endif JAVA4
        if (message == null) {
            message = "";
        }

        writer.println(info + " " + t.toString() + " " + message);
    }

    public void flush() {

        if (writer != null) {
            writer.flush();
        }
    }

    public void close() {

        if (writer != null && !isSystem) {
            writer.close();
        }

        writer = null;
    }
}

Other HSQLDB examples (source code examples)

Here is a short list of links related to this HSQLDB SimpleLog.java source code file:

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