/* - kupuloggers.js - */
/*****************************************************************************
 *
 * Copyright (c) 2003-2005 Kupu Contributors. All rights reserved.
 *
 * This software is distributed under the terms of the Kupu
 * License. See LICENSE.txt for license text. For a list of Kupu
 * Contributors see CREDITS.txt.
 *
 *****************************************************************************/
// $Id: kupuloggers.js 220234 2010-04-02 10:59:22Z mihxil $


//----------------------------------------------------------------------------
// Loggers
//
//  Loggers are pretty simple classes, that should have 1 method, called
//  'log'. This is called with 2 arguments, the first one is the message to
//  log and the second is the severity, which can be 0 or some other false
//  value for debug messages, 1 for warnings and 2 for errors (the loggers
//  are allowed to raise an exception if that happens).
//
//----------------------------------------------------------------------------

function DebugLogger() {
    /* Alert all messages */

    this.log = function(message, severity) {
        /* log a message */
        if (severity > 1) {
            alert("Error: " + message);
        } else if (severity == 1) {
            alert("Warning: " + message);
        } else {
            alert("Log message: " + message);
        }
    };
}

function PlainLogger(debugelid, maxlength) {
    /* writes messages to a debug tool and throws errors */

    this.debugel = getFromSelector(debugelid);
    this.maxlength = maxlength;

    this.log = function(message, severity) {
        /* log a message */
        if (severity > 1) {
            throw message;
        } else {
	    var now = new Date();
	    var time = now.getHours() + ':' + now.getMinutes() + ':' + now.getSeconds();
	    var logMessage = time + ' - ' + message;
	    if (this.debugel != null) {
		if (this.maxlength) {
                    if (this.debugel.childNodes.length > this.maxlength - 1) {
			this.debugel.removeChild(this.debugel.childNodes[0]);
                    }
		}

		var div = document.createElement('div');
		var text = document.createTextNode(logMessage);
		div.appendChild(text);
		this.debugel.appendChild(div);
	    } else {
		if (typeof console != "undefined") {
		    console.log(logMessage);
		}
	    }
        }
    };
}

function DummyLogger() {
    this.log = function(message, severity) {
        if (severity > 1) {
            throw message;
        }
    };
}