| // Copyright (C) 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. |
| |
| package com.google.gerrit.server.util; |
| |
| import com.google.common.collect.ImmutableSet; |
| import com.google.gerrit.entities.AttentionSetUpdate; |
| import com.google.gerrit.entities.AttentionSetUpdate.Operation; |
| import java.util.Collection; |
| |
| /** Common helpers for dealing with attention set data structures. */ |
| public class AttentionSetUtil { |
| /** Returns only updates where the user was added. */ |
| public static ImmutableSet<AttentionSetUpdate> additionsOnly( |
| Collection<AttentionSetUpdate> updates) { |
| return updates.stream() |
| .filter(u -> u.operation() == Operation.ADD) |
| .collect(ImmutableSet.toImmutableSet()); |
| } |
| |
| private AttentionSetUtil() {} |
| } |