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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:
    *
    *   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 org.jboss.netty.handler.codec.spdy;
  
  import org.jboss.netty.handler.codec.http.HttpHeaders;
  import org.jboss.netty.handler.codec.http.HttpMessage;
  
  /**
   * Provides the constants for the header names and the utility methods
   * used by the {@link SpdyHttpDecoder} and {@link SpdyHttpEncoder}.
   * @apiviz.stereotype static
   */
  public final class SpdyHttpHeaders {
  
      /**
       * SPDY HTTP header names
       * @apiviz.stereotype static
       */
      public static final class Names {
          /**
           * {@code "X-SPDY-Stream-ID"}
           */
          public static final String STREAM_ID = "X-SPDY-Stream-ID";
          /**
           * {@code "X-SPDY-Associated-To-Stream-ID"}
           */
          public static final String ASSOCIATED_TO_STREAM_ID = "X-SPDY-Associated-To-Stream-ID";
          /**
           * {@code "X-SPDY-Priority"}
           */
          public static final String PRIORITY = "X-SPDY-Priority";
          /**
           * {@code "X-SPDY-URL"}
           */
          public static final String URL = "X-SPDY-URL";
          /**
           * {@code "X-SPDY-Scheme"}
           */
          public static final String SCHEME = "X-SPDY-Scheme";
  
          private Names() {
          }
      }
  
      private SpdyHttpHeaders() {
      }
  
      /**
       * Removes the {@code "X-SPDY-Stream-ID"} header.
       */
      public static void removeStreamId(HttpMessage message) {
          message.headers().remove(Names.STREAM_ID);
      }
  
      /**
       * Returns the value of the {@code "X-SPDY-Stream-ID"} header.
       */
      public static int getStreamId(HttpMessage message) {
          return HttpHeaders.getIntHeader(message, Names.STREAM_ID);
      }
  
      /**
       * Sets the {@code "X-SPDY-Stream-ID"} header.
       */
      public static void setStreamId(HttpMessage message, int streamId) {
          HttpHeaders.setIntHeader(message, Names.STREAM_ID, streamId);
      }
  
      /**
       * Removes the {@code "X-SPDY-Associated-To-Stream-ID"} header.
       */
      public static void removeAssociatedToStreamId(HttpMessage message) {
          message.headers().remove(Names.ASSOCIATED_TO_STREAM_ID);
      }
  
      /**
       * Returns the value of the {@code "X-SPDY-Associated-To-Stream-ID"} header.
       *
       * @return the header value or {@code 0} if there is no such header or
       *         if the header value is not a number
       */
      public static int getAssociatedToStreamId(HttpMessage message) {
          return HttpHeaders.getIntHeader(message, Names.ASSOCIATED_TO_STREAM_ID, 0);
      }
  
      /**
      * Sets the {@code "X-SPDY-Associated-To-Stream-ID"} header.
      */
     public static void setAssociatedToStreamId(HttpMessage message, int associatedToStreamId) {
         HttpHeaders.setIntHeader(message, Names.ASSOCIATED_TO_STREAM_ID, associatedToStreamId);
     }
 
     /**
      * Removes the {@code "X-SPDY-Priority"} header.
      */
     public static void removePriority(HttpMessage message) {
         message.headers().remove(Names.PRIORITY);
     }
 
     /**
      * Returns the value of the {@code "X-SPDY-Priority"} header.
      *
      * @return the header value or {@code 0} if there is no such header or
      *         if the header value is not a number
      */
     public static byte getPriority(HttpMessage message) {
         return (byte) HttpHeaders.getIntHeader(message, Names.PRIORITY, 0);
     }
 
     /**
      * Sets the {@code "X-SPDY-Priority"} header.
      */
     public static void setPriority(HttpMessage message, byte priority) {
         HttpHeaders.setIntHeader(message, Names.PRIORITY, priority);
     }
 
     /**
      * Removes the {@code "X-SPDY-URL"} header.
      */
     public static void removeUrl(HttpMessage message) {
         message.headers().remove(Names.URL);
     }
 
     /**
      * Returns the value of the {@code "X-SPDY-URL"} header.
      */
     public static String getUrl(HttpMessage message) {
         return message.headers().get(Names.URL);
     }
 
     /**
      * Sets the {@code "X-SPDY-URL"} header.
      */
     public static void setUrl(HttpMessage message, String url) {
         message.headers().set(Names.URL, url);
     }
 
     /**
      * Removes the {@code "X-SPDY-Scheme"} header.
      */
     public static void removeScheme(HttpMessage message) {
         message.headers().remove(Names.SCHEME);
     }
 
     /**
      * Returns the value of the {@code "X-SPDY-Scheme"} header.
      */
     public static String getScheme(HttpMessage message) {
         return message.headers().get(Names.SCHEME);
     }
 
     /**
      * Sets the {@code "X-SPDY-Scheme"} header.
      */
     public static void setScheme(HttpMessage message, String scheme) {
         message.headers().set(Names.SCHEME, scheme);
     }
 }