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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef GPU_NP_UTILS_DEFAULT_NP_OBJECT_H_ | |
| 6 #define GPU_NP_UTILS_DEFAULT_NP_OBJECT_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 #include "gpu/np_utils/np_headers.h" | |
| 10 | |
| 11 namespace np_utils { | |
| 12 | |
| 13 class BaseNPDispatcher; | |
| 14 | |
| 15 // This class implements each of the functions in the NPClass interface. They | |
| 16 // all return error by default. Note that these are not virtual functions and | |
| 17 // this is not an interface. This class can be used as a mixin so that an | |
| 18 // NPObject class does not need to implement every NPClass function but rather | |
| 19 // inherits a default from DefaultNPObject. | |
| 20 template <typename RootClass> | |
| 21 class DefaultNPObject : public RootClass { | |
| 22 public: | |
| 23 void Invalidate() {} | |
| 24 | |
| 25 bool HasMethod(NPIdentifier name) { | |
| 26 return false; | |
| 27 } | |
| 28 | |
| 29 bool Invoke(NPIdentifier name, | |
| 30 const NPVariant* args, | |
| 31 uint32_t num_args, | |
| 32 NPVariant* result) { | |
| 33 return false; | |
| 34 } | |
| 35 | |
| 36 bool InvokeDefault(const NPVariant* args, | |
| 37 uint32_t num_args, | |
| 38 NPVariant* result) { | |
| 39 return false; | |
| 40 } | |
| 41 | |
| 42 bool HasProperty(NPIdentifier name) { | |
| 43 return false; | |
| 44 } | |
| 45 | |
| 46 bool GetProperty(NPIdentifier name, NPVariant* result) { | |
| 47 return false; | |
| 48 } | |
| 49 | |
| 50 bool SetProperty(NPIdentifier name, const NPVariant* value) { | |
| 51 return false; | |
| 52 } | |
| 53 | |
| 54 bool RemoveProperty(NPIdentifier name) { | |
| 55 return false; | |
| 56 } | |
| 57 | |
| 58 bool Enumerate(NPIdentifier** names, | |
| 59 uint32_t* count) { | |
| 60 *names = NULL; | |
| 61 *count = 0; | |
| 62 return true; | |
| 63 } | |
| 64 | |
| 65 bool Construct(const NPVariant* args, | |
| 66 uint32_t num_args, | |
| 67 NPVariant* result) { | |
| 68 return false; | |
| 69 } | |
| 70 | |
| 71 static BaseNPDispatcher* GetDispatcherChain() { | |
| 72 return NULL; | |
| 73 } | |
| 74 | |
| 75 protected: | |
| 76 DefaultNPObject() {} | |
| 77 virtual ~DefaultNPObject() {} | |
| 78 | |
| 79 private: | |
| 80 DISALLOW_COPY_AND_ASSIGN(DefaultNPObject); | |
| 81 }; | |
| 82 } // namespace np_utils | |
| 83 | |
| 84 #endif // GPU_NP_UTILS_DEFAULT_NP_OBJECT_H_ | |
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