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.image;
  
  import org.apache.kafka.common.metadata.ClientQuotaRecord;
  import org.apache.kafka.common.quota.ClientQuotaEntity;
  import org.apache.kafka.server.common.MetadataVersion;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Map.Entry;
  
  
  public final class ClientQuotasDelta {
      private final ClientQuotasImage image;
      private final Map<ClientQuotaEntity, ClientQuotaDelta> changes = new HashMap<>();
  
      public ClientQuotasDelta(ClientQuotasImage image) {
          this.image = image;
      }
  
      public Map<ClientQuotaEntity, ClientQuotaDelta> changes() {
          return changes;
      }
  
      public void finishSnapshot() {
          for (Entry<ClientQuotaEntity, ClientQuotaImage> entry : image.entities().entrySet()) {
              ClientQuotaEntity entity = entry.getKey();
              ClientQuotaImage quotaImage = entry.getValue();
              ClientQuotaDelta quotaDelta = changes.computeIfAbsent(entity,
                  __ -> new ClientQuotaDelta(quotaImage));
              quotaDelta.finishSnapshot();
          }
      }
  
      public void handleMetadataVersionChange(MetadataVersion newVersion) {
          // no-op
      }
  
      public void replay(ClientQuotaRecord record) {
          ClientQuotaEntity entity = ClientQuotaImage.dataToEntity(record.entity());
          ClientQuotaDelta change = changes.computeIfAbsent(entity, __ ->
              new ClientQuotaDelta(image.entities().
                  getOrDefault(entity, ClientQuotaImage.EMPTY)));
          change.replay(record);
      }
  
      public ClientQuotasImage apply() {
          Map<ClientQuotaEntity, ClientQuotaImage> newEntities =
              new HashMap<>(image.entities().size());
          for (Entry<ClientQuotaEntity, ClientQuotaImage> entry : image.entities().entrySet()) {
              ClientQuotaEntity entity = entry.getKey();
              ClientQuotaDelta change = changes.get(entity);
              if (change == null) {
                  newEntities.put(entity, entry.getValue());
              } else {
                  ClientQuotaImage quotaImage = change.apply();
                  if (!quotaImage.isEmpty()) {
                      newEntities.put(entity, quotaImage);
                  }
              }
          }
          for (Entry<ClientQuotaEntity, ClientQuotaDelta> entry : changes.entrySet()) {
              ClientQuotaEntity entity = entry.getKey();
              if (!newEntities.containsKey(entity)) {
                  ClientQuotaImage quotaImage = entry.getValue().apply();
                  if (!quotaImage.isEmpty()) {
                      newEntities.put(entity, quotaImage);
                  }
              }
          }
          return new ClientQuotasImage(newEntities);
      }
  
      @Override
      public String toString() {
          return "ClientQuotasDelta(" +
              "changes=" + changes +
              ')';
      }
  }
  