public ByteBuffer run(Retriever retriever) {
if (!retriever.getState().equals(Retriever.RETRIEVER_STATE_SUCCESSFUL)) return null;
HTTPRetriever htr = (HTTPRetriever) retriever;
if (htr.getResponseCode() == HttpURLConnection.HTTP_NO_CONTENT) {
// Mark tile as missing to avoid excessive attempts
MercatorTiledImageLayer.this.levels.markResourceAbsent(tile);
return null;
}
if (htr.getResponseCode() != HttpURLConnection.HTTP_OK) return null;
URLRetriever r = (URLRetriever) retriever;
ByteBuffer buffer = r.getBuffer();
String suffix = WWIO.makeSuffixForMimeType(htr.getContentType());
if (suffix == null) {
return null; // TODO: log error
}
String path = tile.getPath().substring(0, tile.getPath().lastIndexOf("."));
path += suffix;
final File outFile = WorldWind.getDataFileStore().newFile(path);
if (outFile == null) return null;
try {
WWIO.saveBuffer(buffer, outFile);
return buffer;
} catch (IOException e) {
e.printStackTrace(); // TODO: log error
return null;
}
}
/**
* Lookup the <code>id</code> in the cache. If found, return results. Otherwise, call delegate to
* fetch content.
*
* @param url the url of the resource to retrieve
* @param id the id of the resource to retrieve
* @return the contents, or null if not found
* @throws IOException if an error occurred retrieving the contents (other than not-found)
*/
public synchronized byte[] retrieve(String url, String id) throws IOException {
SoftReference ref = (SoftReference) cache.get(id);
byte[] res = (ref != null) ? (byte[]) ref.get() : null;
if (log.isDebugEnabled())
log.debug(
"Memory cache('"
+ id
+ "'): "
+ (res != null ? "found" : ref != null ? "expired" : "not found"));
if (res != null || delegate == null) return res;
res = delegate.retrieve(url, id);
if (res == null) return null;
if (log.isDebugEnabled()) log.debug("Caching '" + id + "'");
cache.put(id, new SoftReference(res));
return res;
}