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.causeway.core.runtimeservices.user;
  
  import java.time.ZoneId;
  import java.util.Optional;
  
  import jakarta.inject.Inject;
  import jakarta.inject.Named;
  
  import org.springframework.stereotype.Service;
  
  import org.apache.causeway.applib.annotation.PriorityPrecedence;
  import org.apache.causeway.applib.services.keyvaluestore.KeyValueSessionStore;
  import org.apache.causeway.applib.services.user.UserCurrentSessionTimeZoneHolder;
  import org.apache.causeway.core.runtimeservices.CausewayModuleCoreRuntimeServices;
  
  import org.jspecify.annotations.NonNull;
  
  /**
   * Default implementation of {@link UserCurrentSessionTimeZoneHolder}.
   *
   * @since 2.0 {@index}
   */
  @Service
  @Named(CausewayModuleCoreRuntimeServices.NAMESPACE + ".UserCurrentSessionTimeZoneHolderDefault")
  @jakarta.annotation.Priority(PriorityPrecedence.MIDPOINT)
  public class UserCurrentSessionTimeZoneHolderDefault
  implements UserCurrentSessionTimeZoneHolder {
  
      private static final String SESSION_KEY_ZONE_ID =
              UserCurrentSessionTimeZoneHolderDefault.class.getName() + "#zoneId";
  
      @Inject private Optional<KeyValueSessionStore> keyValueSessionStore = Optional.empty();
  
      @Override
      public void setUserTimeZone(final @NonNull ZoneId zoneId) {
          keyValueSessionStore
              .ifPresent(store->store.put(SESSION_KEY_ZONE_ID, zoneId));
      }
  
      @Override
      public Optional<ZoneId> getUserTimeZone() {
          return keyValueSessionStore
              .flatMap(store->store.lookupAs(SESSION_KEY_ZONE_ID, ZoneId.class));
      }
  
      @Override
      public void clearUserTimeZone() {
          keyValueSessionStore
              .ifPresent(store->store.clear(SESSION_KEY_ZONE_ID));
      }
  
  }
  