1 /*
2  * Copyright (C) 2022 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.queryable.collections;
18 
19 import com.android.queryable.queries.Query;
20 
21 /**
22  * Query for a {@link QueryableSet}.
23  */
24 public interface QueryableSetQuery<E, F extends Query<E>, G extends QueryableSet<E, F, ?>> {
25     /**
26      * Add an option to the query.
27      */
where()28     F where();
29 
30     /**
31      * Get any element matching the query, or {@code null} if nothing matches.
32      */
get()33     /* @Nullable */ E get();
34 
35     /**
36      * Get all elements which match the query.
37      */
filter()38     G filter();
39 }
40