# Yahoo! UI Library

### classnamemanager 3.1.1

Yahoo! UI Library > classnamemanager > classnamemanager.js (source view)
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    /**
    * Contains a singleton (ClassNameManager) that enables easy creation and caching of
    * prefixed class names.
    * @module classnamemanager
    */

    /**
     * A singleton class providing:
     *
     * <ul>
     *    <li>Easy creation of prefixed class names</li>
     *    <li>Caching of previously created class names for improved performance.</li>
     * </ul>
     *
     * @class ClassNameManager
     * @static
     */

    // String constants
    var CLASS_NAME_PREFIX = 'classNamePrefix',
    	CLASS_NAME_DELIMITER = 'classNameDelimiter',
        CONFIG = Y.config;

    // Global config

    /**
     * Configuration property indicating the prefix for all CSS class names in this YUI instance.
     *
     * @property Y.config.classNamePrefix
     * @type {String}
     * @default "yui"
     * @static
     */
    CONFIG[CLASS_NAME_PREFIX] = CONFIG[CLASS_NAME_PREFIX] || 'yui3';

    /**
     * Configuration property indicating the delimiter used to compose all CSS class names in
     * this YUI instance.
     *
     * @property Y.config.classNameDelimiter
     * @type {String}
     * @default "-"
     * @static
     */
    CONFIG[CLASS_NAME_DELIMITER] = CONFIG[CLASS_NAME_DELIMITER] || '-';

    Y.ClassNameManager = function () {

    	var sPrefix    = CONFIG[CLASS_NAME_PREFIX],
    		sDelimiter = CONFIG[CLASS_NAME_DELIMITER];

    	return {

    		/**
    		 * Returns a class name prefixed with the the value of the
    		 * <code>Y.config.classNamePrefix</code> attribute + the provided strings.
    		 * Uses the <code>Y.config.classNameDelimiter</code> attribute to delimit the
    		 * provided strings. E.g. Y.ClassNameManager.getClassName('foo','bar'); // yui-foo-bar
    		 *
    		 * @method getClassName
    		 * @param {String}+ classnameSection one or more classname sections to be joined
    		 * @param {Boolean} skipPrefix If set to true, the classname will not be prefixed with the default Y.config.classNameDelimiter value.
    		 */
    		getClassName: Y.cached(function () {

                var args = Y.Array(arguments);

                if (args[args.length-1] !== true) {
                    args.unshift(sPrefix);
                } else {
                    args.pop();
                }

    			return args.join(sDelimiter);
    		})

    	};

    }();

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