157 lines
4.2 KiB
PHP
157 lines
4.2 KiB
PHP
<?php
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/**
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* Part of XML_XRD
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*
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* PHP version 5
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*
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* @category XML
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* @package XML_XRD
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* @author Christian Weiske <cweiske@php.net>
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* @license http://www.gnu.org/copyleft/lesser.html LGPL
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* @link http://pear.php.net/package/XML_XRD
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*/
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require_once 'XML/XRD/Loader/Exception.php';
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/**
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* File/string loading dispatcher.
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* Loads the correct loader for the type of XRD file (XML or JSON).
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* Also provides type auto-detection.
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*
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* @category XML
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* @package XML_XRD
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* @author Christian Weiske <cweiske@php.net>
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* @license http://www.gnu.org/copyleft/lesser.html LGPL
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* @version Release: @package_version@
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* @link http://pear.php.net/package/XML_XRD
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*/
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class XML_XRD_Loader
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{
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public function __construct(XML_XRD $xrd)
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{
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$this->xrd = $xrd;
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}
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/**
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* Loads the contents of the given file.
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*
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* Note: Only use file type auto-detection for local files.
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* Do not use it on remote files as the file gets requested several times.
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*
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* @param string $file Path to an XRD file
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* @param string $type File type: xml or json, NULL for auto-detection
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*
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* @return void
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*
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* @throws XML_XRD_Loader_Exception When the file is invalid or cannot be
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* loaded
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*/
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public function loadFile($file, $type = null)
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{
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if ($type === null) {
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$type = $this->detectTypeFromFile($file);
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}
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$loader = $this->getLoader($type);
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$loader->loadFile($file);
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}
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/**
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* Loads the contents of the given string
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*
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* @param string $str XRD string
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* @param string $type File type: xml or json, NULL for auto-detection
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*
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* @return void
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*
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* @throws XML_XRD_Loader_Exception When the string is invalid or cannot be
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* loaded
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*/
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public function loadString($str, $type = null)
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{
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if ($type === null) {
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$type = $this->detectTypeFromString($str);
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}
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$loader = $this->getLoader($type);
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$loader->loadString($str);
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}
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/**
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* Creates a XRD loader object for the given type
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*
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* @param string $type File type: xml or json
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*
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* @return XML_XRD_Loader
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*/
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protected function getLoader($type)
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{
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$class = 'XML_XRD_Loader_' . strtoupper($type);
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$file = str_replace('_', '/', $class) . '.php';
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include_once $file;
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if (class_exists($class)) {
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return new $class($this->xrd);
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}
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throw new XML_XRD_Loader_Exception(
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'No loader for XRD type "' . $type . '"',
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XML_XRD_Loader_Exception::NO_LOADER
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);
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}
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/**
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* Tries to detect the file type (xml or json) from the file content
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*
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* @param string $file File name to check
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*
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* @return string File type ('xml' or 'json')
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*
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* @throws XML_XRD_Loader_Exception When opening the file fails.
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*/
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public function detectTypeFromFile($file)
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{
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if (!file_exists($file)) {
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throw new XML_XRD_Loader_Exception(
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'Error loading XRD file: File does not exist',
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XML_XRD_Loader_Exception::OPEN_FILE
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);
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}
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$handle = fopen($file, 'r');
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if (!$handle) {
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throw new XML_XRD_Loader_Exception(
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'Cannot open file to determine type',
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XML_XRD_Loader_Exception::OPEN_FILE
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);
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}
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$str = (string)fgets($handle, 10);
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fclose($handle);
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return $this->detectTypeFromString($str);
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}
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/**
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* Tries to detect the file type from the content of the file
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*
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* @param string $str Content of XRD file
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*
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* @return string File type ('xml' or 'json')
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*
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* @throws XML_XRD_Loader_Exception When the type cannot be detected
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*/
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public function detectTypeFromString($str)
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{
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if (substr($str, 0, 1) == '{') {
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return 'json';
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} else if (substr($str, 0, 5) == '<?xml') {
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return 'xml';
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}
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throw new XML_XRD_Loader_Exception(
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'Detecting file type failed',
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XML_XRD_Loader_Exception::DETECT_TYPE
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);
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}
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}
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?>
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