src/acl/ReplyHeaderStrategy.h

   1 /*
   2  *
   3  * SQUID Web Proxy Cache          http://www.squid-cache.org/
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   6  *  Squid is the result of efforts by numerous individuals from
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   9  *  development; see the SPONSORS file for full details.  Squid is
  10  *  Copyrighted (C) 2001 by the Regents of the University of
  11  *  California; see the COPYRIGHT file for full details.  Squid
  12  *  incorporates software developed and/or copyrighted by other
  13  *  sources; see the CREDITS file for full details.
  14  *
  15  *  This program is free software; you can redistribute it and/or modify
  16  *  it under the terms of the GNU General Public License as published by
  17  *  the Free Software Foundation; either version 2 of the License, or
  18  *  (at your option) any later version.
  19  *
  20  *  This program is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  *  You should have received a copy of the GNU General Public License
  26  *  along with this program; if not, write to the Free Software
  27  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  28  *
  29  *
  30  * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
  31  */
  32 #ifndef SQUID_ACLREPLYHEADERSTRATEGY_H
  33 #define SQUID_ACLREPLYHEADERSTRATEGY_H
  34
  35 class ACLChecklist;
  36
  37 #include "acl/Acl.h"
  38 #include "acl/Data.h"
  39 #include "acl/FilledChecklist.h"
  40 #include "acl/Strategy.h"
  41 #include "HttpReply.h"
  42
  43 template <http_hdr_type header>
  44 class ACLReplyHeaderStrategy : public ACLStrategy<char const *>
  45 {
  46
  47 public:
  48     virtual int match (ACLData<char const *> * &, ACLFilledChecklist *, ACLFlags &);
  49     virtual bool requiresReply() const {return true;}
  50
  51     static ACLReplyHeaderStrategy *Instance();
  52     /* Not implemented to prevent copies of the instance. */
  53     /* Not private to prevent brain dead g+++ warnings about
  54      * private constructors with no friends */
  55     ACLReplyHeaderStrategy(ACLReplyHeaderStrategy const &);
  56
  57 private:
  58     static ACLReplyHeaderStrategy *Instance_;
  59     ACLReplyHeaderStrategy() {}
  60
  61     ACLReplyHeaderStrategy&operator=(ACLReplyHeaderStrategy const &);
  62 };
  63
  64 template <http_hdr_type header>
  65 int
  66 ACLReplyHeaderStrategy<header>::match (ACLData<char const *> * &data, ACLFilledChecklist *checklist, ACLFlags &)
  67 {
  68     char const *theHeader = checklist->reply->header.getStr(header);
  69
  70     if (NULL == theHeader)
  71         return 0;
  72
  73     return data->match(theHeader);
  74 }
  75
  76 template <http_hdr_type header>
  77 ACLReplyHeaderStrategy<header> *
  78 ACLReplyHeaderStrategy<header>::Instance()
  79 {
  80     if (!Instance_)
  81         Instance_ = new ACLReplyHeaderStrategy<header>;
  82
  83     return Instance_;
  84 }
  85
  86 template <http_hdr_type header>
  87 ACLReplyHeaderStrategy<header> * ACLReplyHeaderStrategy<header>::Instance_ = NULL;
  88
  89 #endif /* SQUID_REPLYHEADERSTRATEGY_H */