@Override
@NonNull
public CacheDownloadLoader.Result loadInBackground() {
if (mUri == null) {
return Result.nullInstance();
}
final String scheme = mUri.getScheme();
File cacheFile = null;
if ("http".equals(scheme) || "https".equals(scheme)) {
final String uriString = mUri.toString();
if (uriString == null) return Result.nullInstance();
cacheFile = mDiskCache.get(uriString);
if (isValid(cacheFile)) {
return Result.getInstance(CacheProvider.getCacheUri(uriString));
}
try {
// from SD cache
ContentLengthInputStream cis;
final InputStream is = mDownloader.get(uriString);
if (is == null) return Result.nullInstance();
try {
final long length = is.available();
mHandler.post(new DownloadStartRunnable(this, mListener, length));
cis = new ContentLengthInputStream(is, length);
mDiskCache.save(
uriString,
cis,
new IoUtils.CopyListener() {
@Override
public boolean onBytesCopied(int current, int total) {
mHandler.post(new ProgressUpdateRunnable(mListener, current, total));
return !isAbandoned();
}
});
mHandler.post(new DownloadFinishRunnable(this, mListener));
} finally {
Utils.closeSilently(is);
}
cacheFile = mDiskCache.get(uriString);
if (isValid(cacheFile)) {
return Result.getInstance(CacheProvider.getCacheUri(uriString));
} else {
mDiskCache.remove(uriString);
throw new IOException();
}
} catch (final Exception e) {
mHandler.post(new DownloadErrorRunnable(this, mListener, e));
return Result.getInstance(e);
}
}
return Result.getInstance(mUri);
}
@Override
public void save(
@NonNull final String key,
@NonNull final InputStream is,
byte[] extra,
final CopyListener listener)
throws IOException {
cache.save(
key,
is,
new IoUtils.CopyListener() {
@Override
public boolean onBytesCopied(final int current, final int total) {
return listener == null || listener.onCopied(current);
}
});
if (extra != null) {
cache.save(CacheProvider.getExtraKey(key), new ByteArrayInputStream(extra), null);
}
}
@NonNull
@Override
public String fromUri(@NonNull final Uri uri) {
return CacheProvider.getCacheKey(uri);
}
@NonNull
@Override
public Uri toUri(@NonNull final String key) {
return CacheProvider.getCacheUri(key, null);
}