/*
    * Copyright 2016 The Netty Project
    *
    * The Netty Project 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 io.netty.handler.ssl;
  
  import io.netty.buffer.ByteBufAllocator;
  import io.netty.util.internal.ObjectUtil;
  
  import javax.net.ssl.SSLEngine;
  import javax.net.ssl.SSLSessionContext;
  import java.util.List;
  
  /**
   * Adapter class which allows to wrap another {@link SslContext} and init {@link SSLEngine} instances.
   */
  public abstract class DelegatingSslContext extends SslContext {
  
      private final SslContext ctx;
  
      protected DelegatingSslContext(SslContext ctx) {
          this.ctx = ObjectUtil.checkNotNull(ctx, "ctx");
      }
  
      @Override
      public final boolean isClient() {
          return ctx.isClient();
      }
  
      @Override
      public final List<String> cipherSuites() {
          return ctx.cipherSuites();
      }
  
      @Override
      public final long sessionCacheSize() {
          return ctx.sessionCacheSize();
      }
  
      @Override
      public final long sessionTimeout() {
          return ctx.sessionTimeout();
      }
  
      @Override
      public final ApplicationProtocolNegotiator applicationProtocolNegotiator() {
          return ctx.applicationProtocolNegotiator();
      }
  
      @Override
      public final SSLEngine newEngine(ByteBufAllocator alloc) {
          SSLEngine engine = ctx.newEngine(alloc);
          initEngine(engine);
          return engine;
      }
  
      @Override
      public final SSLEngine newEngine(ByteBufAllocator alloc, String peerHost, int peerPort) {
          SSLEngine engine = ctx.newEngine(alloc, peerHost, peerPort);
          initEngine(engine);
          return engine;
      }
  
      @Override
      protected final SslHandler newHandler(ByteBufAllocator alloc, boolean startTls) {
          SslHandler handler = ctx.newHandler(alloc, startTls);
          initHandler(handler);
          return handler;
      }
  
      @Override
      protected final SslHandler newHandler(ByteBufAllocator alloc, String peerHost, int peerPort, boolean startTls) {
          SslHandler handler = ctx.newHandler(alloc, peerHost, peerPort, startTls);
          initHandler(handler);
          return handler;
      }
  
      @Override
      public final SSLSessionContext sessionContext() {
          return ctx.sessionContext();
      }
  
      /**
       * Init the {@link SSLEngine}.
       */
      protected abstract void initEngine(SSLEngine engine);
  
      /**
      * Init the {@link SslHandler}. This will by default call {@link #initEngine(SSLEngine)}, sub-classes may override
      * this.
      */
     protected void initHandler(SslHandler handler) {
         initEngine(handler.engine());
     }
 }