trace.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/*
 *  Copyright (c) 2001 Sun Microsystems, Inc.  All rights
 *  reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 *  2. 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.
 *
 *  3. The end-user documentation included with the redistribution,
 *  if any, must include the following acknowledgment:
 *  "This product includes software developed by the
 *  Sun Microsystems, Inc. for Project JXTA."
 *  Alternately, this acknowledgment may appear in the software itself,
 *  if and wherever such third-party acknowledgments normally appear.
 *
 *  4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"
 *  must not be used to endorse or promote products derived from this
 *  software without prior written permission. For written
 *  permission, please contact Project JXTA at http://www.jxta.org.
 *
 *  5. Products derived from this software may not be called "JXTA",
 *  nor may "JXTA" appear in their name, without prior written
 *  permission of Sun.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 THE APACHE SOFTWARE FOUNDATION OR
 *  ITS 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.
 *  ====================================================================
 *
 *  This software consists of voluntary contributions made by many
 *  individuals on behalf of Project JXTA.  For more
 *  information on Project JXTA, please see
 *  <http://www.jxta.org/>.
 *
 *  This license is based on the BSD license adopted by the Apache Foundation.
 *
 *  $Id: Trace.java,v 1.6 2005/12/14 02:13:43 gonzo Exp $
 */
package net.jxta.ext.config;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * <a href="http://logging.apache.org/log4j">Log4J</a> trace level container.
 *
 * @author     james todd [gonzo at jxta dot org]   
 */

public class Trace {

    /**
     * Error trace.
     */
    
    public final static Trace ERROR = new Trace("error");
    
    /**
     *  Warn trace.
     */
    
    public final static Trace WARN = new Trace("warn");
    
    /**
     *  Information trace.
     */
    
    public final static Trace INFO = new Trace("info");
    
    /**
     *  Debug trace.
     */
    
    public final static Trace DEBUG = new Trace("debug");
    
    /**
     *  Default trace.
     */
    
    public final static Trace DEFAULT = new Trace("user default");

    private static List traces;

    private String trace = null;

    static {
        traces = new ArrayList();

        traces.add(ERROR);
        traces.add(WARN);
        traces.add(INFO);
        traces.add(DEBUG);
        traces.add(DEFAULT);
    }

    /**
     * Trace factory for the specified trace level.
     *
     * @param   trace       specified trace level.
     * @return              newly created Trace instance
     */
    
    public static Trace get(String trace) {
        trace = trace != null ? trace.trim() : trace;
        
        Trace t = null;

        for (Iterator ts = getTraces().iterator(); ts.hasNext(); ) {
            t = (Trace)ts.next();

            if (t.toString().equalsIgnoreCase(trace)) {
                break;
            }
        }

        return t != null ? t : DEFAULT;
    }

    /**
     * Accessor for the registered traces.
     *
     * @return          {@link java.util.List} of traces
     */
    
    public static List getTraces() {
        return traces;
    }

    /**
     * String representation of this object.
     *
     * @return          {@link java.lang.String} represenation
     */
    
    public String toString() {
        return this.trace;
    }

    private Trace(String trace) {
        this.trace = trace;
    }
}