Clients/ExplorerPlugin/ClassFactory.cpp

   1 /* -*- Mode: C; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2003-2004 Apple Computer, Inc. All rights reserved.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16 */
  17
  18 #include        "StdAfx.h"
  19
  20 #include        "DebugServices.h"
  21
  22 #include        "ExplorerBar.h"
  23 #include        "ExplorerPlugin.h"
  24
  25 #include        "ClassFactory.h"
  26
  27 // MFC Debugging
  28
  29 #ifdef _DEBUG
  30 #define new DEBUG_NEW
  31 #undef THIS_FILE
  32 static char THIS_FILE[] = __FILE__;
  33 #endif
  34
  35 //===========================================================================================================================
  36 //      ClassFactory
  37 //===========================================================================================================================
  38
  39 ClassFactory::ClassFactory( CLSID inCLSID )
  40 {
  41         mCLSIDObject    = inCLSID;
  42         mRefCount               = 1;
  43         ++gDLLRefCount;
  44 }
  45
  46 //===========================================================================================================================
  47 //      ~ClassFactory
  48 //===========================================================================================================================
  49
  50 ClassFactory::~ClassFactory( void )
  51 {
  52         check( gDLLRefCount > 0 );
  53
  54         --gDLLRefCount;
  55 }
  56
  57 #if 0
  58 #pragma mark -
  59 #pragma mark == IUnknown methods ==
  60 #endif
  61
  62 //===========================================================================================================================
  63 //      QueryInterface
  64 //===========================================================================================================================
  65
  66 STDMETHODIMP    ClassFactory::QueryInterface( REFIID inID, LPVOID *outResult )
  67 {
  68         HRESULT         err;
  69
  70         check( outResult );
  71
  72         if( IsEqualIID( inID, IID_IUnknown ) )
  73         {
  74                 *outResult = this;
  75         }
  76         else if( IsEqualIID( inID, IID_IClassFactory ) )
  77         {
  78                 *outResult = (IClassFactory *) this;
  79         }
  80         else
  81         {
  82                 *outResult = NULL;
  83                 err = E_NOINTERFACE;
  84                 goto exit;
  85         }
  86
  87         ( *( (LPUNKNOWN *) outResult ) )->AddRef();
  88         err = S_OK;
  89
  90 exit:
  91         return( err );
  92 }
  93
  94 //===========================================================================================================================
  95 //      AddRef
  96 //===========================================================================================================================
  97
  98 STDMETHODIMP_( DWORD )  ClassFactory::AddRef( void )
  99 {
 100         return( ++mRefCount );
 101 }
 102
 103 //===========================================================================================================================
 104 //      Release
 105 //===========================================================================================================================
 106
 107 STDMETHODIMP_( DWORD )  ClassFactory::Release( void )
 108 {
 109         DWORD           count;
 110
 111         count = --mRefCount;
 112         if( count == 0 )
 113         {
 114                 delete this;
 115         }
 116         return( count );
 117 }
 118
 119 #if 0
 120 #pragma mark -
 121 #pragma mark == IClassFactory methods ==
 122 #endif
 123
 124 //===========================================================================================================================
 125 //      CreateInstance
 126 //===========================================================================================================================
 127
 128 STDMETHODIMP    ClassFactory::CreateInstance( LPUNKNOWN inUnknown, REFIID inID, LPVOID *outObject )
 129 {
 130         HRESULT         err;
 131         LPVOID          obj;
 132
 133         check( outObject );
 134
 135         obj             = NULL;
 136         *outObject      = NULL;
 137         require_action( !inUnknown, exit, err = CLASS_E_NOAGGREGATION );
 138
 139         // Create the object based on the CLSID.
 140
 141         if( IsEqualCLSID( mCLSIDObject, CLSID_ExplorerBar ) )
 142         {
 143                 try
 144                 {
 145                         obj = new ExplorerBar();
 146                 }
 147                 catch( ... )
 148                 {
 149                         // Don't let exception escape.
 150                 }
 151                 require_action( obj, exit, err = E_OUTOFMEMORY );
 152         }
 153         else
 154         {
 155                 err = E_FAIL;
 156                 goto exit;
 157         }
 158
 159         // Query for the specified interface. Release the factory since QueryInterface retains it.
 160
 161         err = ( (LPUNKNOWN ) obj )->QueryInterface( inID, outObject );
 162         ( (LPUNKNOWN ) obj )->Release();
 163
 164 exit:
 165         return( err );
 166 }
 167
 168 //===========================================================================================================================
 169 //      LockServer
 170 //===========================================================================================================================
 171
 172 STDMETHODIMP    ClassFactory::LockServer( BOOL inLock )
 173 {
 174         DEBUG_UNUSED( inLock );
 175
 176         return( E_NOTIMPL );
 177 }