content/xtf/src/nsXTFWeakTearoff.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 "nsXPTCUtils.h"
  41 #include "nsIInterfaceInfo.h"
  42 #include "nsIInterfaceInfoManager.h"
  43 #include "nsServiceManagerUtils.h"
  44 #include "nsAutoPtr.h"
  45 #ifdef DEBUG
  46 #include <stdio.h>
  47 #endif
  48
  49 ////////////////////////////////////////////////////////////////////////
  50 // nsXTFWeakTearoff class
  51
  52 class nsXTFWeakTearoff : protected nsAutoXPTCStub
  53 {
  54 protected:
  55   ~nsXTFWeakTearoff();
  56
  57 public:
  58   nsXTFWeakTearoff(const nsIID& iid,
  59                    nsISupports* obj,
  60                    nsresult *rv);
  61
  62   // nsISupports interface
  63   NS_DECL_ISUPPORTS
  64
  65   NS_IMETHOD CallMethod(PRUint16 methodIndex,
  66                         const XPTMethodDescriptor* info,
  67                         nsXPTCMiniVariant* params);
  68
  69 private:
  70   nsISupports *mObj;
  71   nsIID mIID;
  72 };
  73
  74 //----------------------------------------------------------------------
  75 // implementation:
  76
  77 nsXTFWeakTearoff::nsXTFWeakTearoff(const nsIID& iid,
  78                                    nsISupports* obj,
  79                                    nsresult *rv)
  80   : mObj(obj), mIID(iid)
  81 {
  82   MOZ_COUNT_CTOR(nsXTFWeakTearoff);
  83
  84   *rv = InitStub(iid);
  85 }
  86
  87 nsXTFWeakTearoff::~nsXTFWeakTearoff()
  88 {
  89   MOZ_COUNT_DTOR(nsXTFWeakTearoff);
  90 }
  91
  92 nsresult
  93 NS_NewXTFWeakTearoff(const nsIID& iid,
  94                      nsISupports* obj,
  95                      nsISupports** aResult){
  96   NS_PRECONDITION(aResult != nsnull, "null ptr");
  97   if (!aResult)
  98     return NS_ERROR_NULL_POINTER;
  99
 100   nsresult rv;
 101
 102   nsRefPtr<nsXTFWeakTearoff> result =
 103     new nsXTFWeakTearoff(iid, obj, &rv);
 104   if (!result)
 105     return NS_ERROR_OUT_OF_MEMORY;
 106
 107   if (NS_FAILED(rv))
 108     return rv;
 109
 110   return result->QueryInterface(iid, (void**) aResult);
 111 }
 112
 113 //----------------------------------------------------------------------
 114 // nsISupports implementation
 115
 116 NS_IMPL_ADDREF(nsXTFWeakTearoff)
 117 NS_IMPL_RELEASE(nsXTFWeakTearoff)
 118
 119 NS_IMETHODIMP
 120 nsXTFWeakTearoff::QueryInterface(REFNSIID aIID, void** aInstancePtr)
 121 {
 122   NS_PRECONDITION(aInstancePtr, "null out param");
 123
 124   if (aIID.Equals(mIID) || aIID.Equals(NS_GET_IID(nsISupports))) {
 125     *aInstancePtr = mXPTCStub;
 126     NS_ADDREF_THIS();
 127     return NS_OK;
 128   }
 129   // we can't map QI onto the obj, because the xpcom wrapper otherwise
 130   // QI-accumulates all interfaces defined on mObj
 131   //  else return mObj->QueryInterface(aIID, aInstancePtr);
 132   *aInstancePtr = nsnull;
 133   return NS_ERROR_NO_INTERFACE;
 134 }
 135
 136 NS_IMETHODIMP
 137 nsXTFWeakTearoff::CallMethod(PRUint16 methodIndex,
 138                              const XPTMethodDescriptor* info,
 139                              nsXPTCMiniVariant* params)
 140 {
 141   NS_ASSERTION(methodIndex >= 3,
 142                "huh? indirect nsISupports method call unexpected");
 143
 144   // prepare args:
 145   int paramCount = info->num_args;
 146   nsXPTCVariant* fullPars;
 147   if (!paramCount) {
 148     fullPars = nsnull;
 149   }
 150   else {
 151     fullPars = new nsXPTCVariant[paramCount];
 152     if (!fullPars)
 153       return NS_ERROR_OUT_OF_MEMORY;
 154   }
 155
 156   for (int i=0; i<paramCount; ++i) {
 157     const nsXPTParamInfo& paramInfo = info->params[i];
 158     uint8 flags = paramInfo.IsOut() ? nsXPTCVariant::PTR_IS_DATA : 0;
 159     fullPars[i].Init(params[i], paramInfo.GetType(), flags);
 160   }
 161
 162   // make the call:
 163   nsresult rv = NS_InvokeByIndex(mObj, methodIndex, paramCount, fullPars);
 164   if (fullPars)
 165     delete []fullPars;
 166   return rv;
 167 }