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   /*
    * Copyright 2014 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.http2;
  
  import io.netty.handler.codec.EmptyHeaders;
  import io.netty.util.internal.UnstableApi;
  
  @UnstableApi
  public final class EmptyHttp2Headers
          extends EmptyHeaders<CharSequence, CharSequence, Http2Headers> implements Http2Headers {
      public static final EmptyHttp2Headers INSTANCE = new EmptyHttp2Headers();
  
      private EmptyHttp2Headers() {
      }
  
      @Override
      public EmptyHttp2Headers method(CharSequence method) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public EmptyHttp2Headers scheme(CharSequence status) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public EmptyHttp2Headers authority(CharSequence authority) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public EmptyHttp2Headers path(CharSequence path) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public EmptyHttp2Headers status(CharSequence status) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public CharSequence method() {
          return get(PseudoHeaderName.METHOD.value());
      }
  
      @Override
      public CharSequence scheme() {
          return get(PseudoHeaderName.SCHEME.value());
      }
  
      @Override
      public CharSequence authority() {
          return get(PseudoHeaderName.AUTHORITY.value());
      }
  
      @Override
      public CharSequence path() {
          return get(PseudoHeaderName.PATH.value());
      }
  
      @Override
      public CharSequence status() {
          return get(PseudoHeaderName.STATUS.value());
      }
  
      @Override
      public boolean contains(CharSequence name, CharSequence value, boolean caseInsensitive) {
          return false;
      }
  }