content/xtf/src/nsXTFInterfaceAggregator.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 // nsXTFInterfaceAggregator class
  51
  52 class nsXTFInterfaceAggregator : protected nsAutoXPTCStub
  53 {
  54 protected:
  55   friend nsresult
  56   NS_NewXTFInterfaceAggregator(const nsIID& iid,
  57                                nsISupports* inner,
  58                                nsISupports* outer,
  59                                void** result);
  60
  61   nsXTFInterfaceAggregator(const nsIID& iid,
  62                            nsISupports* inner,
  63                            nsISupports* outer,
  64                            nsresult *rv);
  65   ~nsXTFInterfaceAggregator();
  66
  67 public:
  68   // nsISupports interface
  69   NS_DECL_ISUPPORTS
  70
  71   NS_IMETHOD CallMethod(PRUint16 methodIndex,
  72                         const XPTMethodDescriptor* info,
  73                         nsXPTCMiniVariant* params);
  74
  75 private:
  76   nsISupports *mInner;
  77   nsISupports *mOuter;
  78   nsIID mIID;
  79 };
  80
  81 //----------------------------------------------------------------------
  82 // implementation:
  83
  84 nsXTFInterfaceAggregator::nsXTFInterfaceAggregator(const nsIID& iid,
  85                                                    nsISupports* inner,
  86                                                    nsISupports* outer,
  87                                                    nsresult *rv)
  88   : mInner(inner), mOuter(outer), mIID(iid)
  89 {
  90 #ifdef DEBUG
  91 //  printf("nsXTFInterfaceAggregator CTOR\n");
  92 #endif
  93   mInner->AddRef();
  94   mOuter->AddRef();
  95
  96   *rv = InitStub(iid);
  97 }
  98
  99 nsXTFInterfaceAggregator::~nsXTFInterfaceAggregator()
 100 {
 101 #ifdef DEBUG
 102 //  printf("nsXTFInterfaceAggregator DTOR\n");
 103 #endif
 104   mInner->Release();
 105   mOuter->Release();
 106 }
 107
 108 nsresult
 109 NS_NewXTFInterfaceAggregator(const nsIID& iid,
 110                              nsISupports* inner,
 111                              nsISupports* outer,
 112                              void** aResult){
 113   NS_PRECONDITION(aResult != nsnull, "null ptr");
 114   if (!aResult)
 115     return NS_ERROR_NULL_POINTER;
 116
 117   nsresult rv;
 118
 119   nsRefPtr<nsXTFInterfaceAggregator> result =
 120     new nsXTFInterfaceAggregator(iid, inner, outer, &rv);
 121   if (!result)
 122     return NS_ERROR_OUT_OF_MEMORY;
 123
 124   if (NS_FAILED(rv))
 125     return rv;
 126
 127   return result->QueryInterface(iid, aResult);
 128 }
 129
 130 //----------------------------------------------------------------------
 131 // nsISupports implementation
 132
 133 NS_IMPL_ADDREF(nsXTFInterfaceAggregator)
 134 NS_IMPL_RELEASE(nsXTFInterfaceAggregator)
 135
 136 NS_IMETHODIMP
 137 nsXTFInterfaceAggregator::QueryInterface(REFNSIID aIID, void** aInstancePtr)
 138 {
 139   NS_PRECONDITION(aInstancePtr, "null out param");
 140
 141   if (aIID.Equals(mIID)) {
 142     *aInstancePtr = mXPTCStub;
 143     NS_ADDREF_THIS();
 144     return NS_OK;
 145   }
 146
 147   return mOuter->QueryInterface(aIID, aInstancePtr);
 148 }
 149
 150 //----------------------------------------------------------------------
 151 // nsXPTCStubBase implementation
 152
 153 NS_IMETHODIMP
 154 nsXTFInterfaceAggregator::CallMethod(PRUint16 methodIndex,
 155                                      const XPTMethodDescriptor *info,
 156                                      nsXPTCMiniVariant* params)
 157 {
 158   NS_ASSERTION(methodIndex >= 3,
 159                "huh? indirect nsISupports method call unexpected");
 160
 161   // prepare args:
 162   int paramCount = info->num_args;
 163   nsXPTCVariant* fullPars;
 164   if (!paramCount) {
 165     fullPars = nsnull;
 166   }
 167   else {
 168     fullPars = new nsXPTCVariant[paramCount];
 169     if (!fullPars)
 170       return NS_ERROR_OUT_OF_MEMORY;
 171   }
 172
 173   for (int i=0; i<paramCount; ++i) {
 174     const nsXPTParamInfo& paramInfo = info->params[i];
 175     PRUint8 flags = paramInfo.IsOut() ? nsXPTCVariant::PTR_IS_DATA : 0;
 176     fullPars[i].Init(params[i], paramInfo.GetType(), flags);
 177   }
 178
 179   // make the call:
 180   nsresult rv = NS_InvokeByIndex(mInner,
 181                                  methodIndex,
 182                                  paramCount,
 183                                  fullPars);
 184   if (fullPars)
 185     delete []fullPars;
 186   return rv;
 187 }