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Update test and Javadoc

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This commit is contained in:
GGAutomaton 2022-05-11 18:08:14 +08:00
parent d32490a4be
commit ba394a7ab4
2 changed files with 56 additions and 12 deletions
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27
app/src/main/java/org/schabi/newpipe/database/playlist/PlaylistLocalItem.java
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@ -13,13 +13,34 @@ public interface PlaylistLocalItem extends LocalItem {
long getDisplayIndex();
/**
* Merge localPlaylists and remotePlaylists by the display index.
* If two items have the same display index, sort them in {@code CASE_INSENSITIVE_ORDER}.
*
* @param localPlaylists local playlists in the display index order
* @param remotePlaylists remote playlists in the display index order
* @return merged playlists
*/
static List<PlaylistLocalItem> merge(
final List<PlaylistMetadataEntry> localPlaylists,
final List<PlaylistRemoteEntity> remotePlaylists) {
// The playlists from the database must be in the display index order.
// Merge localPlaylists and remotePlaylists by display index.
// If two items have the same display index, sort them in CASE_INSENSITIVE_ORDER.
for (int i = 1; i < localPlaylists.size(); i++) {
if (localPlaylists.get(i).getDisplayIndex()
< localPlaylists.get(i - 1).getDisplayIndex()) {
throw new IllegalArgumentException(
"localPlaylists is not in the display index order");
}
}
for (int i = 1; i < remotePlaylists.size(); i++) {
if (remotePlaylists.get(i).getDisplayIndex()
< remotePlaylists.get(i - 1).getDisplayIndex()) {
throw new IllegalArgumentException(
"remotePlaylists is not in the display index order");
}
}
// This algorithm is similar to the merge operation in merge sort.
final List<PlaylistLocalItem> result = new ArrayList<>(