content/xtf/src/nsXTFService.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is the Mozilla XTF project.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Alex Fritze.
  19  * Portions created by the Initial Developer are Copyright (C) 2004
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   Alex Fritze <alex@croczilla.com> (original author)
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either the GNU General Public License Version 2 or later (the "GPL"), or
  27  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28  * in which case the provisions of the GPL or the LGPL are applicable instead
  29  * of those above. If you wish to allow use of your version of this file only
  30  * under the terms of either the GPL or the LGPL, and not to allow others to
  31  * use your version of this file under the terms of the MPL, indicate your
  32  * decision by deleting the provisions above and replace them with the notice
  33  * and other provisions required by the GPL or the LGPL. If you do not delete
  34  * the provisions above, a recipient may use your version of this file under
  35  * the terms of any one of the MPL, the GPL or the LGPL.
  36  *
  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "nsCOMPtr.h"
  40 #include "nsINodeInfo.h"
  41 #include "nsIServiceManager.h"
  42 #include "nsIXTFElement.h"
  43 #include "nsIXTFElementFactory.h"
  44 #include "nsIXTFService.h"
  45 #include "nsInterfaceHashtable.h"
  46 #include "nsString.h"
  47 #include "nsXTFElementWrapper.h"
  48
  49
  50 ////////////////////////////////////////////////////////////////////////
  51 // nsXTFService class
  52 class nsXTFService : public nsIXTFService
  53 {
  54 protected:
  55   friend nsresult NS_NewXTFService(nsIXTFService** aResult);
  56
  57   nsXTFService();
  58
  59 public:
  60   // nsISupports interface
  61   NS_DECL_ISUPPORTS
  62
  63   // nsIXTFService interface
  64   nsresult CreateElement(nsIContent** aResult, nsINodeInfo* aNodeInfo);
  65
  66 private:
  67   nsInterfaceHashtable<nsUint32HashKey, nsIXTFElementFactory> mFactoryHash;
  68 };
  69
  70 //----------------------------------------------------------------------
  71 // implementation:
  72
  73 nsXTFService::nsXTFService()
  74 {
  75   mFactoryHash.Init(); // XXX this can fail. move to Init()
  76 }
  77
  78 nsresult
  79 NS_NewXTFService(nsIXTFService** aResult)
  80 {
  81   NS_PRECONDITION(aResult != nsnull, "null ptr");
  82   if (! aResult)
  83     return NS_ERROR_NULL_POINTER;
  84
  85   nsXTFService* result = new nsXTFService();
  86   if (! result)
  87     return NS_ERROR_OUT_OF_MEMORY;
  88
  89   NS_ADDREF(result);
  90   *aResult = result;
  91   return NS_OK;
  92 }
  93
  94 //----------------------------------------------------------------------
  95 // nsISupports methods
  96
  97 NS_IMPL_ISUPPORTS1(nsXTFService, nsIXTFService)
  98
  99 //----------------------------------------------------------------------
 100 // nsIXTFService methods
 101
 102 nsresult
 103 nsXTFService::CreateElement(nsIContent** aResult, nsINodeInfo* aNodeInfo)
 104 {
 105   nsCOMPtr<nsIXTFElementFactory> factory;
 106
 107   // Check if we have an xtf factory for the given namespaceid in our cache:
 108   if (!mFactoryHash.Get(aNodeInfo->NamespaceID(), getter_AddRefs(factory))) {
 109     // No. See if there is one registered with the component manager:
 110     nsCAutoString xtf_contract_id(NS_XTF_ELEMENT_FACTORY_CONTRACTID_PREFIX);
 111     nsAutoString uri;
 112     aNodeInfo->GetNamespaceURI(uri);
 113     AppendUTF16toUTF8(uri, xtf_contract_id);
 114 #ifdef DEBUG_xtf_verbose
 115     printf("Testing for XTF factory at %s\n", xtf_contract_id.get());
 116 #endif
 117     factory = do_GetService(xtf_contract_id.get());
 118     if (factory) {
 119 #ifdef DEBUG
 120       printf("We've got an XTF factory: %s \n", xtf_contract_id.get());
 121 #endif
 122       // Put into hash:
 123       mFactoryHash.Put(aNodeInfo->NamespaceID(), factory);
 124     }
 125   }
 126   if (!factory) return NS_ERROR_FAILURE;
 127
 128   // We have an xtf factory. Now try to create an element for the given tag name:
 129   nsCOMPtr<nsIXTFElement> elem;
 130   nsAutoString tagName;
 131   aNodeInfo->GetName(tagName);
 132   factory->CreateElement(tagName, getter_AddRefs(elem));
 133   if (!elem) return NS_ERROR_FAILURE;
 134
 135   // We've got an xtf element. Create a wrapper for it:
 136   return NS_NewXTFElementWrapper(elem, aNodeInfo, aResult);
 137 }
 138