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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_BROWSER_EXTENSION_FUNCTION_REGISTRY_H_
#define EXTENSIONS_BROWSER_EXTENSION_FUNCTION_REGISTRY_H_
#include <map>
#include <string>
#include "base/memory/scoped_refptr.h"
#include "extensions/browser/extension_function_histogram_value.h"
class ExtensionFunction;
// A factory function for creating new ExtensionFunction instances.
using ExtensionFunctionFactory = scoped_refptr<ExtensionFunction> (*)();
// Template for defining ExtensionFunctionFactory.
template <class T>
scoped_refptr<ExtensionFunction> NewExtensionFunction() {
return base::MakeRefCounted<T>();
}
// Contains a list of all known extension functions and allows clients to
// create instances of them.
class ExtensionFunctionRegistry {
public:
struct FactoryEntry {
public:
FactoryEntry();
constexpr FactoryEntry(
ExtensionFunctionFactory factory,
const char* function_name,
extensions::functions::HistogramValue histogram_value)
: factory_(factory),
function_name_(function_name),
histogram_value_(histogram_value) {}
ExtensionFunctionFactory factory_ = nullptr;
const char* function_name_ = nullptr;
extensions::functions::HistogramValue histogram_value_ =
extensions::functions::UNKNOWN;
};
using FactoryMap = std::map<std::string, FactoryEntry>;
static ExtensionFunctionRegistry& GetInstance();
ExtensionFunctionRegistry();
ExtensionFunctionRegistry(const ExtensionFunctionRegistry&) = delete;
ExtensionFunctionRegistry& operator=(const ExtensionFunctionRegistry&) =
delete;
~ExtensionFunctionRegistry();
// Allows overriding of specific functions for testing. Functions must be
// previously registered. Returns true if successful.
bool OverrideFunctionForTesting(const std::string& name,
ExtensionFunctionFactory factory);
// Factory method for the ExtensionFunction registered as 'name'.
scoped_refptr<ExtensionFunction> NewFunction(const std::string& name);
// Registers a new extension function. This will override any existing entry.
void Register(const FactoryEntry& entry);
template <class T>
void RegisterFunction() {
Register(FactoryEntry(&NewExtensionFunction<T>, T::static_function_name(),
T::static_histogram_value()));
}
const FactoryMap& GetFactoriesForTesting() const { return factories_; }
private:
FactoryMap factories_;
};
#endif // EXTENSIONS_BROWSER_EXTENSION_FUNCTION_REGISTRY_H_
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