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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:
    *
    *   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.http;
  
  import org.jboss.netty.buffer.ChannelBuffer;
  
  import static org.jboss.netty.handler.codec.http.HttpConstants.*;
  
  /**
   * Encodes an {@link HttpRequest} or an {@link HttpChunk} into
   * a {@link ChannelBuffer}.
   */
  public class HttpRequestEncoder extends HttpMessageEncoder {
      private static final char SLASH = '/';
      private static final char QUESTION_MARK = '?';
  
      @Override
      protected void encodeInitialLine(ChannelBuffer buf, HttpMessage message) throws Exception {
          HttpRequest request = (HttpRequest) message;
          buf.writeBytes(request.getMethod().toString().getBytes("ASCII"));
          buf.writeByte(SP);
  
          // Add / as absolute path if no is present.
          // See http://tools.ietf.org/html/rfc2616#section-5.1.2
          String uri = request.getUri();
          int start = uri.indexOf("://");
          if (start != -1) {
              int startIndex = start + 3;
              // Correctly handle query params.
              // See https://github.com/netty/netty/issues/2732
              int index = uri.indexOf(QUESTION_MARK, startIndex);
              if (index == -1) {
                  if (uri.lastIndexOf(SLASH) <= startIndex) {
                      uri += SLASH;
                  }
              } else {
                  if (uri.lastIndexOf(SLASH, index) <= startIndex) {
                      int len = uri.length();
                      StringBuilder sb = new StringBuilder(len + 1);
                      sb.append(uri, 0, index);
                      sb.append(SLASH);
                      sb.append(uri, index, len);
                      uri = sb.toString();
                  }
              }
          }
  
          buf.writeBytes(uri.getBytes("UTF-8"));
          buf.writeByte(SP);
          buf.writeBytes(request.getProtocolVersion().toString().getBytes("ASCII"));
          buf.writeByte(CR);
          buf.writeByte(LF);
      }
  }