Examples with Function com.google.android.agera.Function used on opensource projects

Example 1 with Function

use of com.google.android.agera.Function in project agera by google.

the class NotesStore method notesStore.

@NonNull
static synchronized NotesStore notesStore(@NonNull final Context applicationContext) {
    // Create a database supplier that initializes the database. This is also used to supply the
    // database in all database operations.
    final NotesSqlDatabaseSupplier databaseSupplier = databaseSupplier(applicationContext);
    // Create a function that processes database write operations.
    final Function<SqlInsertRequest, Result<Long>> insertNoteFunction = databaseInsertFunction(databaseSupplier);
    final Function<SqlUpdateRequest, Result<Integer>> updateNoteFunction = databaseUpdateFunction(databaseSupplier);
    final Function<SqlDeleteRequest, Result<Integer>> deleteNoteFunction = databaseDeleteFunction(databaseSupplier);
    final UpdateDispatcher updateDispatcher = updateDispatcher();
    final Receiver<SqlDeleteRequest> delete = value -> STORE_EXECUTOR.execute(() -> {
        deleteNoteFunction.apply(value);
        updateDispatcher.update();
    });
    final Receiver<SqlUpdateRequest> update = value -> STORE_EXECUTOR.execute(() -> {
        updateNoteFunction.apply(value);
        updateDispatcher.update();
    });
    final Receiver<SqlInsertRequest> insert = value -> STORE_EXECUTOR.execute(() -> {
        insertNoteFunction.apply(value);
        updateDispatcher.update();
    });
    // Create the wired up notes store
    return new NotesStore(repositoryWithInitialValue(INITIAL_VALUE).observe(updateDispatcher).onUpdatesPerLoop().goTo(STORE_EXECUTOR).getFrom(() -> sqlRequest().sql(GET_NOTES_FROM_TABLE).compile()).attemptTransform(databaseQueryFunction(databaseSupplier, cursor -> note(cursor.getInt(ID_COLUMN_INDEX), cursor.getString(NOTE_COLUMN_INDEX)))).orEnd(staticFunction(INITIAL_VALUE)).thenTransform(notes -> {
        final Map<Character, List<Note>> notesGroupsData = new TreeMap<>();
        for (final Note note : notes) {
            final String noteText = note.getNote();
            final char groupId = isEmpty(noteText) ? 0 : noteText.charAt(0);
            List<Note> notesGroupData = notesGroupsData.get(groupId);
            if (notesGroupData == null) {
                notesGroupData = new ArrayList<>();
                notesGroupsData.put(groupId, notesGroupData);
            }
            notesGroupData.add(note);
        }
        final List<NoteGroup> notesGroups = new ArrayList<>();
        for (final Map.Entry<Character, List<Note>> groupData : notesGroupsData.entrySet()) {
            notesGroups.add(noteGroup(String.valueOf(groupData.getKey()), groupData.getKey(), groupData.getValue()));
        }
        return notesGroups;
    }).onConcurrentUpdate(SEND_INTERRUPT).onDeactivation(SEND_INTERRUPT).compile(), insert, update, delete, databaseSupplier);
}