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() {}
}

@@ -1,8 +1,617 @@
+// Copyright (C) 2020 The Android Open Source Project%0A//%0A// Licensed under the Apache License, Version 2.0 (the %22License%22);%0A// you may not use this file except in compliance with the License.%0A// You may obtain a copy of the License at%0A//%0A// http://www.apache.org/licenses/LICENSE-2.0%0A//%0A// Unless required by applicable law or agreed to in writing, software%0A// distributed under the License is distributed on an %22AS IS%22 BASIS,%0A// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A// See the License for the specific language governing permissions and%0A// limitations under the License.%0A%0A
 package 

Add missing license header