package votorola.g.net; // Copyright 2012, Michael Allan.  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Votorola Software"), to deal in the Votorola Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Votorola Software, and to permit persons to whom the Votorola Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Votorola Software. THE VOTOROLA SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE VOTOROLA SOFTWARE OR THE USE OR OTHER DEALINGS IN THE VOTOROLA SOFTWARE.

import java.net.*;
import java.util.*;
import votorola.g.lang.*;


/** CookieHandler utilities.
  */
public @ThreadSafe final class CookieHandlerX
{

    private CookieHandlerX() {}



    /** Constructs a Cookie header value for a request.
      *
      *   @param requestHeaders a map of all other cookie-related request headers.  It
      *     will not be modified.
      */
    public static String newRequestHeader( final URI requestURI,
      final Map<String, List<String>> requestHeaders, final CookieHandler handler )
        throws java.io.IOException
    {
        final Map<String, List<String>> cookieRequestHeaders = handler.get( requestURI,
          requestHeaders );
        final List<String> pairs = cookieRequestHeaders.get( "Cookie" );
          // as opposed to Cookie2, which I suppose are version 2 cookies, or something
        final int pN = pairs.size();
        if( pN == 0 ) return null;

        final StringBuilder b = new StringBuilder( pN * 32/*init capacity, guess*/ );
        final Iterator<String> p = pairs.iterator();
        for( ;; )
        {
            // Concatenate all key/value pairs as a single header value separated by
            // semicolons.  Apparently multiple Cookie headers each with a single
            // key/value pair are (unlike Set-Cookie) non-standard.
            final String pair = p.next();
            b.append( pair ); // foo=bar
            if( !p.hasNext() ) break;

            b.append( ';' );  // foo=bar;
        }
        return b.toString();
    }



}