summaryrefslogtreecommitdiff
path: root/xpcom/glue/nsComponentManagerUtils.h
blob: 1e321a9fa76b4b7c7e064173da7bd50a779212e8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsComponentManagerUtils_h__
#define nsComponentManagerUtils_h__

#include "nscore.h"
#include "nsCOMPtr.h"

#include "nsIFactory.h"


nsresult CallCreateInstance(const nsCID& aClass, nsISupports* aDelegate,
                            const nsIID& aIID, void** aResult);

nsresult CallCreateInstance(const char* aContractID, nsISupports* aDelegate,
                            const nsIID& aIID, void** aResult);

nsresult CallGetClassObject(const nsCID& aClass, const nsIID& aIID,
                            void** aResult);

nsresult CallGetClassObject(const char* aContractID, const nsIID& aIID,
                            void** aResult);


class MOZ_STACK_CLASS nsCreateInstanceByCID final : public nsCOMPtr_helper
{
public:
  nsCreateInstanceByCID(const nsCID& aCID, nsresult* aErrorPtr)
    : mCID(aCID)
    , mErrorPtr(aErrorPtr)
  {
  }

  virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const
    override;

private:
  const nsCID&    mCID;
  nsresult*       mErrorPtr;
};

class MOZ_STACK_CLASS nsCreateInstanceByContractID final : public nsCOMPtr_helper
{
public:
  nsCreateInstanceByContractID(const char* aContractID, nsresult* aErrorPtr)
    : mContractID(aContractID)
    , mErrorPtr(aErrorPtr)
  {
  }

  virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override;

private:
  const char*   mContractID;
  nsresult*     mErrorPtr;
};

class MOZ_STACK_CLASS nsCreateInstanceFromFactory final : public nsCOMPtr_helper
{
public:
  nsCreateInstanceFromFactory(nsIFactory* aFactory, nsresult* aErrorPtr)
    : mFactory(aFactory)
    , mErrorPtr(aErrorPtr)
  {
  }

  virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override;

private:
  nsIFactory* MOZ_NON_OWNING_REF mFactory;
  nsresult*     mErrorPtr;
};


inline const nsCreateInstanceByCID
do_CreateInstance(const nsCID& aCID, nsresult* aError = 0)
{
  return nsCreateInstanceByCID(aCID, aError);
}

inline const nsCreateInstanceByContractID
do_CreateInstance(const char* aContractID, nsresult* aError = 0)
{
  return nsCreateInstanceByContractID(aContractID, aError);
}

inline const nsCreateInstanceFromFactory
do_CreateInstance(nsIFactory* aFactory, nsresult* aError = 0)
{
  return nsCreateInstanceFromFactory(aFactory, aError);
}


class MOZ_STACK_CLASS nsGetClassObjectByCID final : public nsCOMPtr_helper
{
public:
  nsGetClassObjectByCID(const nsCID& aCID, nsresult* aErrorPtr)
    : mCID(aCID)
    , mErrorPtr(aErrorPtr)
  {
  }

  virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override;

private:
  const nsCID&    mCID;
  nsresult*       mErrorPtr;
};

class MOZ_STACK_CLASS nsGetClassObjectByContractID final : public nsCOMPtr_helper
{
public:
  nsGetClassObjectByContractID(const char* aContractID, nsresult* aErrorPtr)
    : mContractID(aContractID)
    , mErrorPtr(aErrorPtr)
  {
  }

  virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override;

private:
  const char*   mContractID;
  nsresult*     mErrorPtr;
};

/**
 * do_GetClassObject can be used to improve performance of callers
 * that call |CreateInstance| many times.  They can cache the factory
 * and call do_CreateInstance or CallCreateInstance with the cached
 * factory rather than having the component manager retrieve it every
 * time.
 */
inline const nsGetClassObjectByCID
do_GetClassObject(const nsCID& aCID, nsresult* aError = 0)
{
  return nsGetClassObjectByCID(aCID, aError);
}

inline const nsGetClassObjectByContractID
do_GetClassObject(const char* aContractID, nsresult* aError = 0)
{
  return nsGetClassObjectByContractID(aContractID, aError);
}

// type-safe shortcuts for calling |CreateInstance|
template<class DestinationType>
inline nsresult
CallCreateInstance(const nsCID& aClass,
                   nsISupports* aDelegate,
                   DestinationType** aDestination)
{
  NS_PRECONDITION(aDestination, "null parameter");

  return CallCreateInstance(aClass, aDelegate,
                            NS_GET_TEMPLATE_IID(DestinationType),
                            reinterpret_cast<void**>(aDestination));
}

template<class DestinationType>
inline nsresult
CallCreateInstance(const nsCID& aClass, DestinationType** aDestination)
{
  NS_PRECONDITION(aDestination, "null parameter");

  return CallCreateInstance(aClass, nullptr,
                            NS_GET_TEMPLATE_IID(DestinationType),
                            reinterpret_cast<void**>(aDestination));
}

template<class DestinationType>
inline nsresult
CallCreateInstance(const char* aContractID,
                   nsISupports* aDelegate,
                   DestinationType** aDestination)
{
  NS_PRECONDITION(aContractID, "null parameter");
  NS_PRECONDITION(aDestination, "null parameter");

  return CallCreateInstance(aContractID,
                            aDelegate,
                            NS_GET_TEMPLATE_IID(DestinationType),
                            reinterpret_cast<void**>(aDestination));
}

template<class DestinationType>
inline nsresult
CallCreateInstance(const char* aContractID, DestinationType** aDestination)
{
  NS_PRECONDITION(aContractID, "null parameter");
  NS_PRECONDITION(aDestination, "null parameter");

  return CallCreateInstance(aContractID, nullptr,
                            NS_GET_TEMPLATE_IID(DestinationType),
                            reinterpret_cast<void**>(aDestination));
}

template<class DestinationType>
inline nsresult
CallCreateInstance(nsIFactory* aFactory,
                   nsISupports* aDelegate,
                   DestinationType** aDestination)
{
  NS_PRECONDITION(aFactory, "null parameter");
  NS_PRECONDITION(aDestination, "null parameter");

  return aFactory->CreateInstance(aDelegate,
                                  NS_GET_TEMPLATE_IID(DestinationType),
                                  reinterpret_cast<void**>(aDestination));
}

template<class DestinationType>
inline nsresult
CallCreateInstance(nsIFactory* aFactory, DestinationType** aDestination)
{
  NS_PRECONDITION(aFactory, "null parameter");
  NS_PRECONDITION(aDestination, "null parameter");

  return aFactory->CreateInstance(nullptr,
                                  NS_GET_TEMPLATE_IID(DestinationType),
                                  reinterpret_cast<void**>(aDestination));
}

template<class DestinationType>
inline nsresult
CallGetClassObject(const nsCID& aClass, DestinationType** aDestination)
{
  NS_PRECONDITION(aDestination, "null parameter");

  return CallGetClassObject(aClass, NS_GET_TEMPLATE_IID(DestinationType),
                            reinterpret_cast<void**>(aDestination));
}

template<class DestinationType>
inline nsresult
CallGetClassObject(const char* aContractID, DestinationType** aDestination)
{
  NS_PRECONDITION(aDestination, "null parameter");

  return CallGetClassObject(aContractID, NS_GET_TEMPLATE_IID(DestinationType),
                            reinterpret_cast<void**>(aDestination));
}

#endif /* nsComponentManagerUtils_h__ */