//
   //  ========================================================================
   //  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.http;
  
  import java.util.Collections;
  import java.util.Iterator;
  
  public class MetaData implements Iterable<HttpField>
  {
      private HttpVersion _httpVersion;
      private HttpFields _fields;
      private long _contentLength;
  
      public MetaData(HttpVersion version, HttpFields fields)
      {
          this(version, fields, Long.MIN_VALUE);
      }
  
      public MetaData(HttpVersion version, HttpFields fields, long contentLength)
      {
          _httpVersion = version;
          _fields = fields;
          _contentLength = contentLength;
      }
  
      protected void recycle()
      {
          _httpVersion = null;
          if (_fields != null)
              _fields.clear();
          _contentLength = Long.MIN_VALUE;
      }
  
      public boolean isRequest()
      {
          return false;
      }
  
      public boolean isResponse()
      {
          return false;
      }
  
      /**
       * @return the HTTP version of this MetaData object
       */
      public HttpVersion getVersion()
      {
          return _httpVersion;
      }
  
      /**
       * @param httpVersion the HTTP version to set
       */
      public void setHttpVersion(HttpVersion httpVersion)
      {
          _httpVersion = httpVersion;
      }
  
      /**
       * @return the HTTP fields of this MetaData object
       */
      public HttpFields getFields()
      {
          return _fields;
      }
  
      /**
       * @return the content length if available, otherwise {@link Long#MIN_VALUE}
       */
      public long getContentLength()
      {
          if (_contentLength == Long.MIN_VALUE)
          {
              if (_fields != null)
              {
                  HttpField field = _fields.getField(HttpHeader.CONTENT_LENGTH);
                  _contentLength = field == null ? -1 : field.getLongValue();
              }
          }
          return _contentLength;
      }
  
     /**
      * @return an iterator over the HTTP fields
      * @see #getFields()
      */
     public Iterator<HttpField> iterator()
     {
         HttpFields fields = getFields();
         return fields == null ? Collections.<HttpField>emptyIterator() : fields.iterator();
     }
 
     @Override
     public String toString()
     {
         StringBuilder out = new StringBuilder();
         for (HttpField field : this)
             out.append(field).append(System.lineSeparator());
         return out.toString();
     }
 
     public static class Request extends MetaData
     {
         private String _method;
         private HttpURI _uri;
 
         public Request(HttpFields fields)
         {
             this(null, null, null, fields);
         }
 
         public Request(String method, HttpURI uri, HttpVersion version, HttpFields fields)
         {
             this(method, uri, version, fields, Long.MIN_VALUE);
         }
 
         public Request(String method, HttpURI uri, HttpVersion version, HttpFields fields, long contentLength)
         {
             super(version, fields, contentLength);
             _method = method;
             _uri = uri;
         }
 
         public Request(String method, HttpScheme scheme, HostPortHttpField hostPort, String uri, HttpVersion version, HttpFields fields)
         {
             this(method, new HttpURI(scheme == null ? null : scheme.asString(), hostPort.getHost(), hostPort.getPort(), uri), version, fields);
         }
 
         public Request(String method, HttpScheme scheme, HostPortHttpField hostPort, String uri, HttpVersion version, HttpFields fields, long contentLength)
         {
             this(method, new HttpURI(scheme == null ? null : scheme.asString(), hostPort.getHost(), hostPort.getPort(), uri), version, fields, contentLength);
         }
 
         public Request(String method, String scheme, HostPortHttpField hostPort, String uri, HttpVersion version, HttpFields fields, long contentLength)
         {
             this(method, new HttpURI(scheme, hostPort.getHost(), hostPort.getPort(), uri), version, fields, contentLength);
         }
 
         public Request(Request request)
         {
             this(request.getMethod(),new HttpURI(request.getURI()), request.getVersion(), new HttpFields(request.getFields()), request.getContentLength());
         }
 
         // TODO MetaData should be immuttable!!! 
         public void recycle()
         {
             super.recycle();
             _method = null;
             if (_uri != null)
                 _uri.clear();
         }
 
         @Override
         public boolean isRequest()
         {
             return true;
         }
 
         /**
          * @return the HTTP method
          */
         public String getMethod()
         {
             return _method;
         }
 
         /**
          * @param method the HTTP method to set
          */
         public void setMethod(String method)
         {
             _method = method;
         }
 
         /**
          * @return the HTTP URI
          */
         public HttpURI getURI()
         {
             return _uri;
         }
 
         /**
          * @return the HTTP URI in string form
          */
         public String getURIString()
         {
             return _uri == null ? null : _uri.toString();
         }
 
         /**
          * @param uri the HTTP URI to set
          */
         public void setURI(HttpURI uri)
         {
             _uri = uri;
         }
 
         @Override
         public String toString()
         {
             HttpFields fields = getFields();
             return String.format("%s{u=%s,%s,h=%d}",
                     getMethod(), getURI(), getVersion(), fields == null ? -1 : fields.size());
         }
     }
 
     public static class Response extends MetaData
     {
         private int _status;
         private String _reason;
 
         public Response()
         {
             this(null, 0, null);
         }
 
         public Response(HttpVersion version, int status, HttpFields fields)
         {
             this(version, status, fields, Long.MIN_VALUE);
         }
 
         public Response(HttpVersion version, int status, HttpFields fields, long contentLength)
         {
             super(version, fields, contentLength);
             _status = status;
         }
 
         public Response(HttpVersion version, int status, String reason, HttpFields fields, long contentLength)
         {
             super(version, fields, contentLength);
             _reason = reason;
             _status = status;
         }
 
         @Override
         public boolean isResponse()
         {
             return true;
         }
 
         /**
          * @return the HTTP status
          */
         public int getStatus()
         {
             return _status;
         }
 
         /**
          * @return the HTTP reason
          */
         public String getReason()
         {
             return _reason;
         }
 
         /**
          * @param status the HTTP status to set
          */
         public void setStatus(int status)
         {
             _status = status;
         }
 
         /**
          * @param reason the HTTP reason to set
          */
         public void setReason(String reason)
         {
             _reason = reason;
         }
 
         @Override
         public String toString()
         {
             HttpFields fields = getFields();
             return String.format("%s{s=%d,h=%d}", getVersion(), getStatus(), fields == null ? -1 : fields.size());
         }
     }
 }