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   /*
    * Copyright 2012 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:
    *
    *   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 io.netty.handler.codec.socks;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.util.internal.ObjectUtil;
  
  import java.util.Collections;
  import java.util.List;
  
  /**
   * An socks init request.
   *
   * @see SocksInitResponse
   * @see SocksInitRequestDecoder
   */
  public final class SocksInitRequest extends SocksRequest {
      private final List<SocksAuthScheme> authSchemes;
  
      public SocksInitRequest(List<SocksAuthScheme> authSchemes) {
          super(SocksRequestType.INIT);
          this.authSchemes = ObjectUtil.checkNotNull(authSchemes, "authSchemes");
      }
  
      /**
       * Returns the List<{@link SocksAuthScheme}> of this {@link SocksInitRequest}
       *
       * @return The List<{@link SocksAuthScheme}> of this {@link SocksInitRequest}
       */
      public List<SocksAuthScheme> authSchemes() {
          return Collections.unmodifiableList(authSchemes);
      }
  
      @Override
      public void encodeAsByteBuf(ByteBuf byteBuf) {
          byteBuf.writeByte(protocolVersion().byteValue());
          byteBuf.writeByte(authSchemes.size());
          for (SocksAuthScheme authScheme : authSchemes) {
              byteBuf.writeByte(authScheme.byteValue());
          }
      }
  }