/**
* Returns an unmodifiable Map of url->Metadata (i.e. A second HashMap) for a list of urls. Must
* not be called from UI or Gecko threads.
*/
public static Map<String, Map<String, Object>> getForUrls(
final ContentResolver cr, final List<String> urls, final List<String> columns) {
ThreadUtils.assertNotOnUiThread();
ThreadUtils.assertNotOnGeckoThread();
final Map<String, Map<String, Object>> data = new HashMap<String, Map<String, Object>>();
// Nothing to query for
if (urls.isEmpty() || columns.isEmpty()) {
Log.e(LOGTAG, "Queried metadata for nothing");
return data;
}
// Search the cache for any of these urls
List<String> urlsToQuery = new ArrayList<String>();
for (String url : urls) {
final Map<String, Object> hit = cache.get(url);
if (hit != null) {
// Cache hit!
data.put(url, hit);
} else {
urlsToQuery.add(url);
}
}
Telemetry.HistogramAdd("FENNEC_TILES_CACHE_HIT", data.size());
// If everything was in the cache, we're done!
if (urlsToQuery.size() == 0) {
return Collections.unmodifiableMap(data);
}
final String selection =
DBUtils.computeSQLInClause(urlsToQuery.size(), URLMetadataTable.URL_COLUMN);
// We need the url to build our final HashMap, so we force it to be included in the query.
if (!columns.contains(URLMetadataTable.URL_COLUMN)) {
columns.add(URLMetadataTable.URL_COLUMN);
}
final Cursor cursor =
cr.query(
URLMetadataTable.CONTENT_URI,
columns.toArray(new String[columns.size()]), // columns,
selection, // selection
urlsToQuery.toArray(new String[urlsToQuery.size()]), // selectionargs
null);
try {
if (!cursor.moveToFirst()) {
return Collections.unmodifiableMap(data);
}
do {
final Map<String, Object> metadata = fromCursor(cursor);
final String url =
cursor.getString(cursor.getColumnIndexOrThrow(URLMetadataTable.URL_COLUMN));
data.put(url, metadata);
cache.put(url, metadata);
} while (cursor.moveToNext());
} finally {
cursor.close();
}
return Collections.unmodifiableMap(data);
}
