| /* |
| * Copyright 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| @file:Suppress("unused") // Currently, all samples incorrectly labeled as unused. |
| |
| package androidx.paging.samples |
| |
| import androidx.annotation.Sampled |
| import androidx.paging.PagingData |
| |
| lateinit var pagingData: PagingData<String> |
| |
| @Sampled |
| fun insertSeparatorsSample() { |
| /* |
| * Create letter separators in an alphabetically sorted list. |
| * |
| * For example, if the input is: |
| * "apple", "apricot", "banana", "carrot" |
| * |
| * The operator would output: |
| * "A", "apple", "apricot", "B", "banana", "C", "carrot" |
| */ |
| pagingData.insertSeparators { before: String?, after: String? -> |
| if (after != null && before?.first() != after.first()) { |
| // separator - after is first item that starts with its first letter |
| after.first().toUpperCase().toString() |
| } else { |
| // no separator - either end of list, or first letters of before/after are the same |
| null |
| } |
| } |
| } |