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   /*
    * Copyright 2013 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.spdy;
  
  import io.netty.handler.codec.CharSequenceValueConverter;
  import io.netty.handler.codec.DefaultHeaders;
  import io.netty.handler.codec.HeadersUtils;
  
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map.Entry;
  
  import static io.netty.util.AsciiString.CASE_INSENSITIVE_HASHER;
  import static io.netty.util.AsciiString.CASE_SENSITIVE_HASHER;
  
  public class DefaultSpdyHeaders extends DefaultHeaders<CharSequence, CharSequence, SpdyHeaders> implements SpdyHeaders {
      private static final NameValidator<CharSequence> SpdyNameValidator = new NameValidator<CharSequence>() {
          @Override
          public void validateName(CharSequence name) {
              SpdyCodecUtil.validateHeaderName(name);
          }
      };
  
      public DefaultSpdyHeaders() {
          this(true);
      }
  
      @SuppressWarnings("unchecked")
      public DefaultSpdyHeaders(boolean validate) {
          super(CASE_INSENSITIVE_HASHER,
                  validate ? HeaderValueConverterAndValidator.INSTANCE : CharSequenceValueConverter.INSTANCE,
                  validate ? SpdyNameValidator : NameValidator.NOT_NULL);
      }
  
      @Override
      public String getAsString(CharSequence name) {
          return HeadersUtils.getAsString(this, name);
      }
  
      @Override
      public List<String> getAllAsString(CharSequence name) {
          return HeadersUtils.getAllAsString(this, name);
      }
  
      @Override
      public Iterator<Entry<String, String>> iteratorAsString() {
          return HeadersUtils.iteratorAsString(this);
      }
  
      @Override
      public boolean contains(CharSequence name, CharSequence value) {
          return contains(name, value, false);
      }
  
      @Override
      public boolean contains(CharSequence name, CharSequence value, boolean ignoreCase) {
          return contains(name, value,
                  ignoreCase ? CASE_INSENSITIVE_HASHER : CASE_SENSITIVE_HASHER);
      }
  
      private static final class HeaderValueConverterAndValidator extends CharSequenceValueConverter {
          public static final HeaderValueConverterAndValidator INSTANCE = new HeaderValueConverterAndValidator();
  
          @Override
          public CharSequence convertObject(Object value) {
              final CharSequence seq = super.convertObject(value);
              SpdyCodecUtil.validateHeaderValue(seq);
              return seq;
          }
      }
  }