/**
* Load an image from primary or secondary storage.
*
* @param url the image URL
* @param pseudoGeocode the geocode or the shared name
* @param forceKeep keep the image if it is there, without checking its freshness
* @return <code>true</code> if the image was there and is fresh enough, <code>false</code>
* otherwise
*/
@NonNull
private Pair<Bitmap, Boolean> loadImageFromStorage(
final String url, final String pseudoGeocode, final boolean forceKeep) {
try {
final File file = LocalStorage.getStorageFile(pseudoGeocode, url, true, false);
final Pair<Bitmap, Boolean> image = loadCachedImage(file, forceKeep);
if (image.getRight() || image.getLeft() != null) {
return image;
}
final File fileSec = LocalStorage.getStorageSecFile(pseudoGeocode, url, true);
return loadCachedImage(fileSec, forceKeep);
} catch (Exception e) {
Log.w("HtmlImage.loadImageFromStorage", e);
}
return new ImmutablePair<Bitmap, Boolean>(null, false);
}
/**
* Make a fresh copy of the file to reset its timestamp. On some storage, it is impossible to
* modify the modified time after the fact, in which case a brand new file must be created if we
* want to be able to use the time as validity hint.
*
* <p>See Android issue 1699.
*
* @param file the file to refresh
*/
private static void makeFreshCopy(final File file) {
final File tempFile = new File(file.getParentFile(), file.getName() + "-temp");
if (file.renameTo(tempFile)) {
LocalStorage.copy(tempFile, file);
FileUtils.deleteIgnoringFailure(tempFile);
} else {
Log.e("Could not reset timestamp of file " + file.getAbsolutePath());
}
}
/**
* Download or refresh the copy of <code>url</code> in <code>file</code>.
*
* @param url the url of the document
* @param file the file to save the document in
* @return <code>true</code> if the existing file was up-to-date, <code>false</code> otherwise
*/
private boolean downloadOrRefreshCopy(final String url, final File file) {
final String absoluteURL = makeAbsoluteURL(url);
if (absoluteURL != null) {
try {
final HttpResponse httpResponse = Network.getRequest(absoluteURL, null, file);
if (httpResponse != null) {
final int statusCode = httpResponse.getStatusLine().getStatusCode();
if (statusCode == 200) {
LocalStorage.saveEntityToFile(httpResponse, file);
} else if (statusCode == 304) {
if (!file.setLastModified(System.currentTimeMillis())) {
makeFreshCopy(file);
}
return true;
}
}
} catch (Exception e) {
Log.e("HtmlImage.downloadOrRefreshCopy", e);
}
}
return false;
}