/*
    * Copyright 2018 LINE Corporation
    *
    * LINE Corporation 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:
    *
    *   https://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.linecorp.centraldogma.server.internal.admin.auth;
  
  import static java.util.Objects.requireNonNull;
  
  import java.util.concurrent.CompletableFuture;
  
  import com.linecorp.centraldogma.internal.Util;
  import com.linecorp.centraldogma.server.auth.Session;
  import com.linecorp.centraldogma.server.auth.SessionManager;
  
  /**
   * A {@link SessionManager} which forwards all its method calls to another {@link SessionManager}.
   */
  public class ForwardingSessionManager implements SessionManager {
  
      private final SessionManager delegate;
  
      /**
       * Creates a new {@link SessionManager} instance which forwards all its method calls to the specified
       * {@code delegate}.
       */
      protected ForwardingSessionManager(SessionManager delegate) {
          this.delegate = requireNonNull(delegate, "delegate");
      }
  
      protected final <T extends SessionManager> T delegate() {
          return Util.unsafeCast(delegate);
      }
  
      @Override
      public String generateSessionId() {
          return delegate().generateSessionId();
      }
  
      @Override
      public CompletableFuture<Boolean> exists(String sessionId) {
          return delegate().exists(sessionId);
      }
  
      @Override
      public CompletableFuture<Session> get(String sessionId) {
          return delegate().get(sessionId);
      }
  
      @Override
      public CompletableFuture<Void> create(Session session) {
          return delegate().create(session);
      }
  
      @Override
      public CompletableFuture<Void> update(Session session) {
          return delegate().update(session);
      }
  
      @Override
      public CompletableFuture<Void> delete(String sessionId) {
          return delegate().delete(sessionId);
      }
  
      @Override
      public void close() throws Exception {
          delegate().close();
      }
  
      @Override
      public String toString() {
          return getClass().getSimpleName() + '(' + delegate() + ')';
      }
  }