/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.core5.http.message;
  
  import org.apache.hc.core5.annotation.Contract;
  import org.apache.hc.core5.annotation.ThreadingBehavior;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.ProtocolVersion;
  import org.apache.hc.core5.util.Args;
  import org.apache.hc.core5.util.CharArrayBuffer;
  
  /**
   * Default {@link org.apache.hc.core5.http.message.LineFormatter} implementation.
   *
   * @since 4.0
   */
  @Contract(threading = ThreadingBehavior.IMMUTABLE)
  public class BasicLineFormatter implements LineFormatter {
  
      public final static BasicLineFormattericLineFormatter.html#BasicLineFormatter">BasicLineFormatter INSTANCE = new BasicLineFormatter();
  
      public BasicLineFormatter() {
          super();
      }
  
      void formatProtocolVersion(final CharArrayBuffer buffer, final ProtocolVersion version) {
          buffer.append(version.format());
      }
  
      @Override
      public void formatRequestLine(final CharArrayBuffer buffer, final RequestLine reqline) {
          Args.notNull(buffer, "Char array buffer");
          Args.notNull(reqline, "Request line");
          buffer.append(reqline.getMethod());
          buffer.append(' ');
          buffer.append(reqline.getUri());
          buffer.append(' ');
          formatProtocolVersion(buffer, reqline.getProtocolVersion());
      }
  
      @Override
      public void formatStatusLine(final CharArrayBuffer buffer, final StatusLine statusLine) {
          Args.notNull(buffer, "Char array buffer");
          Args.notNull(statusLine, "Status line");
  
          formatProtocolVersion(buffer, statusLine.getProtocolVersion());
          buffer.append(' ');
          buffer.append(Integer.toString(statusLine.getStatusCode()));
          buffer.append(' '); // keep whitespace even if reason phrase is empty
          final String reasonPhrase = statusLine.getReasonPhrase();
          if (reasonPhrase != null) {
              buffer.append(reasonPhrase);
          }
      }
  
      @Override
      public void formatHeader(final CharArrayBuffer buffer, final Header header) {
          Args.notNull(buffer, "Char array buffer");
          Args.notNull(header, "Header");
  
          buffer.append(header.getName());
          buffer.append(": ");
          final String value = header.getValue();
          if (value != null) {
              buffer.ensureCapacity(buffer.length() + value.length());
              for (int valueIndex = 0; valueIndex < value.length(); valueIndex++) {
                  char valueChar = value.charAt(valueIndex);
                  if (valueChar == '\r'
                          || valueChar == '\n'
                          || valueChar == '\f'
                          || valueChar == 0x0b) {
                      valueChar = ' ';
                  }
                  buffer.append(valueChar);
             }
         }
     }
 
 }