filterloglistener.java

POS is a Java&#174 platform-based, mission-critical, ISO-8583 based financial transaction library/fr

/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2008 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.util;

import java.io.PrintStream;
import java.util.Date;
import java.util.Hashtable;

import org.jpos.core.Configurable;
import org.jpos.core.Configuration;
import org.jpos.core.ConfigurationException;


/**
 * A specific log listener that filters logs based on
 * their priorities,
 * priorities are ordered as follows: TRACE < DEBUG < INFO < WARN < ERROR < FATAL
 * default priority is Log.INFO
 * @author <a href="mailto:[e-mail]">Alireza Taherkordi</a>
 * @version $Revision: 2594 $ $Date: 2008-01-22 14:41:31 -0200 (Tue, 22 Jan 2008) $
 */
public class FilterLogListener implements LogListener,Configurable
{

    private static Hashtable levels;

    static{
            levels = new Hashtable();
            levels.put(Log.TRACE, new Integer(1));
            levels.put(Log.DEBUG, new Integer(2));
            levels.put(Log.INFO, new Integer(3));
            levels.put(Log.WARN, new Integer(4));
            levels.put(Log.ERROR, new Integer(5));
            levels.put(Log.FATAL, new Integer(6));
    }

    private String priority = Log.INFO;
    PrintStream p;

    public FilterLogListener() {
        super();
        p = System.out;
    }

    public FilterLogListener(PrintStream p) {
        super();
        setPrintStream(p);
    }

    public void setConfiguration (Configuration cfg)
        throws ConfigurationException
    {
        try {
            String log_priority = cfg.get("priority");
            if ( (log_priority != null) && (!log_priority.trim().equals("")) )
            {
                if (levels.containsKey(log_priority))
                    priority = log_priority;
            }
        } catch (Exception e) {
            throw new ConfigurationException (e);
        }
    }



    public synchronized void setPrintStream(PrintStream p) {
        this.p = p;
    }

    public synchronized void close() {
        if (p != null) {
            p.close();
            p = null;
        }
    }

    public String getPriority() {
        return priority;
    }

    public void setPriority(String priority) {
        this.priority = priority;
    }

    public boolean permitLogging(String tagLevel)
    {
        Integer I = (Integer)levels.get(tagLevel);

        if (I == null)
            I = (Integer)levels.get(Log.INFO);

        Integer J = (Integer)levels.get(priority);

        return ( I.intValue() >= J.intValue() );
    }

    public synchronized LogEvent log(LogEvent ev) {
        if (p != null) {
            if (permitLogging(ev.tag))
            {
                Date d = new Date();
                p.println(
                        "<log realm=\"" + ev.getRealm() + "\" at=\"" + d.toString()
                        + "." + d.getTime() % 1000 + "\">"
                );
                ev.dump(p, "  ");
                p.println("</log>");
                p.flush();
            }
        }
        return ev;
    }
}