yiiapi/framework/web/CAssetManager.php

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<?php
/**
 * CAssetManager class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright 2008-2013 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */


/**
 * CAssetManager is a Web application component that manages private files (called assets) and makes them accessible by Web clients.
 *
 * It achieves this goal by copying assets to a Web-accessible directory
 * and returns the corresponding URL for accessing them.
 *
 * To publish an asset, simply call {@link publish()}.
 *
 * The Web-accessible directory holding the published files is specified
 * by {@link setBasePath basePath}, which defaults to the "assets" directory
 * under the directory containing the application entry script file.
 * The property {@link setBaseUrl baseUrl} refers to the URL for accessing
 * the {@link setBasePath basePath}.
 *
 * @property string $basePath The root directory storing the published asset files. Defaults to 'WebRoot/assets'.
 * @property string $baseUrl The base url that the published asset files can be accessed.
 * Note, the ending slashes are stripped off. Defaults to '/AppBaseUrl/assets'.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.web
 * @since 1.0
 */
class CAssetManager extends CApplicationComponent
{
	/**
	 * Default web accessible base path for storing private files
	 */
	const DEFAULT_BASEPATH='assets';
	/**
	 * @var boolean whether to use symbolic link to publish asset files. Defaults to false, meaning
	 * asset files are copied to public folders. Using symbolic links has the benefit that the published
	 * assets will always be consistent with the source assets. This is especially useful during development.
	 *
	 * However, there are special requirements for hosting environments in order to use symbolic links.
	 * In particular, symbolic links are supported only on Linux/Unix, and Windows Vista/2008 or greater.
	 * The latter requires PHP 5.3 or greater.
	 *
	 * Moreover, some Web servers need to be properly configured so that the linked assets are accessible
	 * to Web users. For example, for Apache Web server, the following configuration directive should be added
	 * for the Web folder:
	 * <pre>
	 * Options FollowSymLinks
	 * </pre>
	 *
	 * Note that this property cannot be true when {@link $forceCopy} property has true value too. Otherwise
	 * an exception would be thrown. Using both properties at the same time is illogical because both of them
	 * are solving similar tasks but in a different ways. Please refer to the {@link $forceCopy} documentation
	 * for more details.
	 *