/*************************************************************************
 * 
 * ADOBE CONFIDENTIAL __________________
 * 
 * Copyright 2002 - 2007 Adobe Systems Incorporated All Rights Reserved.
 * 
 * NOTICE: All information contained herein is, and remains the property of Adobe Systems Incorporated and its suppliers, if any. The intellectual and technical concepts contained herein are
 * proprietary to Adobe Systems Incorporated and its suppliers and may be covered by U.S. and Foreign Patents, patents in process, and are protected by trade secret or copyright law. Dissemination of
 * this information or reproduction of this material is strictly forbidden unless prior written permission is obtained from Adobe Systems Incorporated.
 **************************************************************************/
package flex.messaging.util;

import java.util.Date;

/**
 * Primitive run-time tracing class
 * 
 * Code as follows: if (Trace.foo) Trace.trace("trace msg"...);
 * 
 * Enable as follows: java -Dtrace.foo -Dtrace.foo2 -Dtrace.foo3 or -Dtrace.all
 * 
 * Special flags: -Dtrace.flex -- enables all tracing -Dtrace.foo -- enables tracing on foo subsystem -Dtrace.timeStamp -- timeStamp all output lines -Dtrace.caller -- print the Class:method caller
 * -Dtrace.stackLines=10 -- print 10 stack lines -Dtrace.stackPrefix=java.lang -- print the stack up to java.lang
 * 
 * Add new xxx members as desired.
 * 
 * @exclude
 */

public class Trace
{
    public static final boolean config = (System.getProperty("trace.config") != null);

    public static final boolean amf = (System.getProperty("trace.amf") != null);
    public static final boolean remote = amf || (System.getProperty("trace.remote") != null);
    public static final boolean ssl = (System.getProperty("trace.ssl") != null);

    public static final boolean rtmp = (System.getProperty("trace.rtmp") != null);
    public static final boolean command = rtmp || (System.getProperty("trace.command") != null);
    public static final boolean error = rtmp || (System.getProperty("trace.error") != null);
    public static final boolean message = rtmp || (System.getProperty("trace.message") != null);
    public static final boolean resolve = rtmp || (System.getProperty("trace.resolve") != null);
    public static final boolean transport = rtmp || (System.getProperty("trace.transport") != null);
    public static final boolean ack = rtmp || (System.getProperty("trace.ack") != null);
    public static final boolean io = rtmp || (System.getProperty("trace.io") != null);
    public static final boolean threadpool = rtmp || (System.getProperty("trace.threadpool") != null);

    // print just the stack caller
    public static final boolean caller = (System.getProperty("trace.caller") != null);
    // print stack up to the prefix
    public static final String stackPrefix = System.getProperty("trace.stackPrefix");

    // print this number of stack lines
    public static int stackLines = 0;
    static
    {
        try
        {
            stackLines = Integer.parseInt(System.getProperty("trace.stackLines"));
        }
        catch (NumberFormatException e)
        {
        }
    }
    // print a timestamp with each line
    public static final boolean timeStamp = (System.getProperty("trace.timeStamp") != null);

    /**
     * Write the string as a line to the trace stream. If the "stack" property is enabled, then the caller's stack call is also shown in the date.
     * 
     * @param str
     *            string to write to the trace stream
     */
    public static void trace(String str)
    {
        if (timeStamp)
            System.err.print(new Date());

        if (caller)
            System.err.print(ExceptionUtil.getCallAt(new Throwable(), 1) + " ");

        System.err.println(str);

        if (stackLines > 0)
            System.err.println(ExceptionUtil.getStackTraceLines(new Throwable(), stackLines));
        else if (stackPrefix != null)
            System.err.println(ExceptionUtil.getStackTraceUpTo(new Throwable(), stackPrefix));
    }
}