content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.kafka.coordinator.group;
  
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.coordinator.group.api.assignor.GroupAssignment;
  import org.apache.kafka.coordinator.group.modern.MemberSubscriptionAndAssignmentImpl;
  
  import java.util.AbstractMap;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.LinkedHashMap;
  import java.util.LinkedHashSet;
  import java.util.Map;
  import java.util.Set;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class AssignmentTestUtil {
      public static Map.Entry<Uuid, Set<Integer>> mkTopicAssignment(
          Uuid topicId,
          Integer... partitions
      ) {
          return new AbstractMap.SimpleEntry<>(
              topicId,
              new HashSet<>(Arrays.asList(partitions))
          );
      }
  
      public static Map.Entry<Uuid, Set<Integer>> mkOrderedTopicAssignment(
          Uuid topicId,
          Integer... partitions
      ) {
          return new AbstractMap.SimpleEntry<>(
              topicId,
              new LinkedHashSet<>(Arrays.asList(partitions))
          );
      }
  
      @SafeVarargs
      public static Map<Uuid, Set<Integer>> mkAssignment(Map.Entry<Uuid, Set<Integer>>... entries) {
          Map<Uuid, Set<Integer>> assignment = new HashMap<>();
          for (Map.Entry<Uuid, Set<Integer>> entry : entries) {
              assignment.put(entry.getKey(), Collections.unmodifiableSet(entry.getValue()));
          }
          return Collections.unmodifiableMap(assignment);
      }
  
      @SafeVarargs
      public static Map<Uuid, Set<Integer>> mkOrderedAssignment(Map.Entry<Uuid, Set<Integer>>... entries) {
          Map<Uuid, Set<Integer>> assignment = new LinkedHashMap<>();
          for (Map.Entry<Uuid, Set<Integer>> entry : entries) {
              assignment.put(entry.getKey(), Collections.unmodifiableSet(entry.getValue()));
          }
          return Collections.unmodifiableMap(assignment);
      }
  
      /**
       * Verifies that the expected assignment is equal to the computed assignment for every member in the group.
       */
      public static void assertAssignment(
          Map<String, Map<Uuid, Set<Integer>>> expectedAssignment,
          GroupAssignment computedGroupAssignment
      ) {
          assertEquals(expectedAssignment.size(), computedGroupAssignment.members().size());
          computedGroupAssignment.members().forEach((memberId, memberAssignment) -> {
              Map<Uuid, Set<Integer>> computedAssignmentForMember = memberAssignment.partitions();
              assertEquals(expectedAssignment.get(memberId), computedAssignmentForMember);
          });
      }
  
      /**
       * Generate a reverse look up map of partition to member target assignments from the given metadata.
       *
       * @param members       The member subscription specs.
       * @return Map of topic partition to member assignments.
       */
      public static Map<Uuid, Map<Integer, String>> invertedTargetAssignment(
          Map<String, MemberSubscriptionAndAssignmentImpl> members
      ) {
          Map<Uuid, Map<Integer, String>> invertedTargetAssignment = new HashMap<>();
          for (Map.Entry<String, MemberSubscriptionAndAssignmentImpl> memberEntry : members.entrySet()) {
              String memberId = memberEntry.getKey();
              Map<Uuid, Set<Integer>> memberAssignment = memberEntry.getValue().partitions();
  
              for (Map.Entry<Uuid, Set<Integer>> topicEntry : memberAssignment.entrySet()) {
                  Uuid topicId = topicEntry.getKey();
                  Set<Integer> partitions = topicEntry.getValue();
  
                  Map<Integer, String> partitionMap = invertedTargetAssignment.computeIfAbsent(topicId, k -> new HashMap<>());
  
                  for (Integer partitionId : partitions) {
                      partitionMap.put(partitionId, memberId);
                  }
              }
          }
          return invertedTargetAssignment;
      }
  }
  