1 /*
<lambda>null2  * 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.libraries.pcc.chronicle.api.cantrip
18 
19 /** A [Cantrip] of [Cantrips]. */
20 class MultiCantrip<Data>(private val cantrips: List<Cantrip<Data>>) : Cantrip<Data> {
21   constructor(vararg cantrips: Cantrip<Data>) : this(cantrips.toList())
22 
23   /** Returns whether or not this [MultiCantrip] is a no-op. */
24   fun isNoOp(): Boolean = cantrips.isEmpty()
25 
26   override fun invoke(datum: Data): Data? {
27     var result = datum
28     cantrips.forEach { cantrip -> result = cantrip(result) ?: return null }
29     return result
30   }
31 }
32