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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
var LogController = {}; //create the logger object
LogController.counter = 0; //current log message number
LogController.listeners = [];
LogController.logLevel = {
FATAL: 50,
ERROR: 40,
WARNING: 30,
INFO: 20,
DEBUG: 10
};
/* set minimum logging level */
LogController.logLevelAtLeast = function(minLevel) {
if (typeof(minLevel) == 'string') {
minLevel = LogController.logLevel[minLevel];
}
return function (msg) {
var msgLevel = msg.level;
if (typeof(msgLevel) == 'string') {
msgLevel = LogController.logLevel[msgLevel];
}
return msgLevel >= minLevel;
};
};
/* creates the log message with the given level and info */
LogController.createLogMessage = function(level, info) {
var msg = {};
msg.num = LogController.counter;
msg.level = level;
msg.info = info;
msg.timestamp = new Date();
return msg;
};
/* helper method to return a sub-array */
LogController.extend = function (args, skip) {
var ret = [];
for (var i = skip; i<args.length; i++) {
ret.push(args[i]);
}
return ret;
};
/* logs message with given level. Currently used locally by log() and error() */
LogController.logWithLevel = function(level, message/*, ...*/) {
var msg = LogController.createLogMessage(
level,
LogController.extend(arguments, 1)
);
LogController.dispatchListeners(msg);
LogController.counter += 1;
};
/* log with level INFO */
LogController.log = function(message/*, ...*/) {
LogController.logWithLevel('INFO', message);
};
/* log with level ERROR */
LogController.error = function(message/*, ...*/) {
LogController.logWithLevel('ERROR', message);
};
/* send log message to listeners */
LogController.dispatchListeners = function(msg) {
for (var k in LogController.listeners) {
var pair = LogController.listeners[k];
if (pair.ident != k || (pair[0] && !pair[0](msg))) {
continue;
}
pair[1](msg);
}
};
/* add a listener to this log given an identifier, a filter (can be null) and the listener object */
LogController.addListener = function(ident, filter, listener) {
if (typeof(filter) == 'string') {
filter = LogController.logLevelAtLeast(filter);
} else if (filter !== null && typeof(filter) !== 'function') {
throw new Error("Filter must be a string, a function, or null");
}
var entry = [filter, listener];
entry.ident = ident;
LogController.listeners[ident] = entry;
};
/* remove a listener from this log */
LogController.removeListener = function(ident) {
delete LogController.listeners[ident];
};
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