public Cursor query()

in PersistenceContentProviderSample/app/src/main/java/com/example/android/contentprovidersample/provider/SampleContentProvider.java [74:94]


    public Cursor query(@NonNull Uri uri, @Nullable String[] projection, @Nullable String selection,
            @Nullable String[] selectionArgs, @Nullable String sortOrder) {
        final int code = MATCHER.match(uri);
        if (code == CODE_CHEESE_DIR || code == CODE_CHEESE_ITEM) {
            final Context context = getContext();
            if (context == null) {
                return null;
            }
            CheeseDao cheese = SampleDatabase.getInstance(context).cheese();
            final Cursor cursor;
            if (code == CODE_CHEESE_DIR) {
                cursor = cheese.selectAll();
            } else {
                cursor = cheese.selectById(ContentUris.parseId(uri));
            }
            cursor.setNotificationUri(context.getContentResolver(), uri);
            return cursor;
        } else {
            throw new IllegalArgumentException("Unknown URI: " + uri);
        }
    }