Index: webkit/renderer/cpp_variant.h |
diff --git a/webkit/renderer/cpp_variant.h b/webkit/renderer/cpp_variant.h |
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-// Copyright (c) 2012 The Chromium Authors. All rights reserved. |
-// Use of this source code is governed by a BSD-style license that can be |
-// found in the LICENSE file. |
- |
-/* |
- This file contains the declaration for CppVariant, a type used by C++ classes |
- that are to be bound to JavaScript objects. |
- |
- CppVariant exists primarily as an interface between C++ callers and the |
- corresponding NPVariant type. CppVariant also provides a number of |
- convenience constructors and accessors, so that the NPVariantType values |
- don't need to be exposed, and a destructor to free any memory allocated for |
- string values. |
- |
- For a usage example, see cpp_binding_example.{h|cc}. |
-*/ |
- |
-#ifndef WEBKIT_RENDERER_CPP_VARIANT_H__ |
-#define WEBKIT_RENDERER_CPP_VARIANT_H__ |
- |
-#include <string> |
-#include <vector> |
- |
-#include "base/basictypes.h" |
-#include "third_party/npapi/bindings/npruntime.h" |
-#include "webkit/renderer/webkit_renderer_export.h" |
- |
-namespace webkit_glue { |
- |
-class WEBKIT_RENDERER_EXPORT CppVariant : public NPVariant { |
- public: |
- CppVariant(); |
- ~CppVariant(); |
- void SetNull(); |
- void Set(bool value); |
- void Set(int32_t value); |
- void Set(double value); |
- |
- // Note that setting a CppVariant to a string value involves copying the |
- // string data, which must be freed with a call to FreeData() when the |
- // CppVariant is set to a different value or is no longer needed. Normally |
- // this is handled by the other Set() methods and by the destructor. |
- void Set(const char* value); // Must be a null-terminated string. |
- void Set(const std::string& value); |
- void Set(const NPString& new_value); |
- void Set(const NPVariant& new_value); |
- |
- // Note that setting a CppVariant to an NPObject involves ref-counting |
- // the actual object. FreeData() should only be called if the CppVariant |
- // is no longer needed. The other Set() methods handle this internally. |
- // Also, the object's NPClass is expected to be a static object: neither |
- // the NP runtime nor CPPVariant will ever free it. |
- void Set(NPObject* new_value); |
- |
- // These three methods all perform deep copies of any string data. This |
- // allows local CppVariants to be released by the destructor without |
- // corrupting their sources. In performance-critical code, or when strings |
- // are very long, avoid creating new CppVariants. |
- // In case of NPObject as the data, the copying involves ref-counting |
- // as opposed to deep-copying. The ref-counting ensures that sources don't |
- // get corrupted when the copies get destroyed. |
- void CopyToNPVariant(NPVariant* result) const; |
- CppVariant& operator=(const CppVariant& original); |
- CppVariant(const CppVariant& original); |
- |
- // Calls NPN_ReleaseVariantValue, which frees any string data |
- // held by the object and sets its type to null. |
- // In case of NPObject, the NPN_ReleaseVariantValue decrements |
- // the ref-count (releases when ref-count becomes 0) |
- void FreeData(); |
- |
- // Compares this CppVariant's type and value to another's. They must be |
- // identical in both type and value to be considered equal. For string and |
- // object types, a deep comparison is performed; that is, the contents of the |
- // strings, or the classes and refcounts of the objects, must be the same, |
- // but they need not be the same pointers. |
- bool isEqual(const CppVariant& other) const; |
- |
- // The value of a CppVariant may be read directly from its NPVariant (but |
- // should only be set using one of the Set() methods above). Although the |
- // type of a CppVariant is likewise public, it can be accessed through these |
- // functions rather than directly if a caller wishes to avoid dependence on |
- // the NPVariantType values. |
- bool isBool() const { return (type == NPVariantType_Bool); } |
- bool isInt32() const { return (type == NPVariantType_Int32); } |
- bool isDouble() const { return (type == NPVariantType_Double); } |
- bool isNumber() const { return (isInt32() || isDouble()); } |
- bool isString() const { return (type == NPVariantType_String); } |
- bool isVoid() const { return (type == NPVariantType_Void); } |
- bool isNull() const { return (type == NPVariantType_Null); } |
- bool isEmpty() const { return (isVoid() || isNull()); } |
- bool isObject() const { return (type == NPVariantType_Object); } |
- |
- // Converters. The CppVariant must be of a type convertible to these values. |
- // For example, ToInt32() works only if isNumber() is true. |
- std::string ToString() const; |
- int32_t ToInt32() const; |
- double ToDouble() const; |
- bool ToBoolean() const; |
- // Returns a vector of CppVariant for the specified variant. This should only |
- // be called on an Object. If the object has no "length" property an empty |
- // vector is returned. |
- std::vector<CppVariant> ToVector() const; |
- |
- // Invoke method of the given name on an object with the supplied arguments. |
- // The first argument should be the object on which the method is to be |
- // invoked. Returns whether the method was successfully invoked. If the |
- // method was invoked successfully, any return value is stored in the |
- // CppVariant specified by result. |
- bool Invoke(const std::string& method, const CppVariant* args, |
- uint32 arg_count, CppVariant& result) const; |
-}; |
- |
-} // namespace webkit_glue |
- |
-#endif // WEBKIT_RENDERER_CPP_VARIANT_H__ |