1 /*
2  * Copyright 2024 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.intentresolver.contentpreview.payloadtoggle.domain.model
18 
19 /** Represents an either updated value or the absence of it */
20 sealed interface ValueUpdate<out T> {
21     data class Value<T>(val value: T) : ValueUpdate<T>
22     data object Absent : ValueUpdate<Nothing>
23 }
24 
25 /** Return encapsulated value if this instance represent Value or `default` if Absent */
getOrDefaultnull26 fun <T> ValueUpdate<T>.getOrDefault(default: T): T =
27     when (this) {
28         is ValueUpdate.Value -> value
29         is ValueUpdate.Absent -> default
30     }
31 
32 /** Executes the `block` with encapsulated value if this instance represents Value */
onValuenull33 inline fun <T> ValueUpdate<T>.onValue(block: (T) -> Unit) {
34     if (this is ValueUpdate.Value) {
35         block(value)
36     }
37 }
38