minor : getImageDatas() implementation

src/classes/WebAsset/Viewer.class.php

@@ -21,6 +21,8 @@
 class WebAsset_Viewer implements IAssetViewer {
     private static $_instance; /**< pointer to current instance */
 
+    private $_asset;
+
     /** 
      * @brief simple singleton mechanism 
      * @return (WebAsset_Viewer) newly_created or current instance
@@ -33,12 +35,23 @@ class WebAsset_Viewer implements IAssetViewer {
         return (self::$_instance);
     }
 
-    public function load($assetUUID) {
+    public function load($asset) {
+        // if (fetch timeout) throw new WaException_Timeout("asset fetch timed out");
+        // if (connect failed) throw new WaException_Fetch("unable to connect...");
+        // if (cache or read failed) throw new WaException_Cache("write permission denied");
+        // if (conversion failed) throw new WaException_Convert("Imagick error msg..")
 
-    }
+        $this->_asset = $asset;
 
-    public function loadSuccessful() {
+        $cache = WebAsset_Cache::instance();
+        if ($cache->isCached($asset)) {
+            // available in cache, no need to fetch asset
+            // FIXME : if cache expires between load() and renderImage() | getImageDatas(), read fails
+            return;
+        }
 
+        $fetcher = WebAsset_Fetcher::instance();
+        $cache->store($asset, $fetcher->fetch($asset));
     }
 
     public function renderImage($toFormat) {
@@ -46,7 +59,21 @@ class WebAsset_Viewer implements IAssetViewer {
     }
 
     public function getImageDatas($toFormat) {
+        $cache = WebAsset_Cache::instance();
 
+        $is_cached = $cache->isFormatCached($this->_asset, $toFormat);
+        if ($is_cached) {
+            return ($cache->retrieveFormat($this->_asset, $toFormat));
+        }
+
+        // convert to requested format:
+        $converter = WebAsset_Converter::instance();
+        $datas = $converter->convert($this->_asset, $toFormat);
+
+        // store converted asset to cache:
+        $cache->storeFormat($this->_asset, $toFormat, $datas);
+
+        return ($datas);
     }
 
     public function renderSound() {