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// Copyright 2014 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.
#ifndef EXTENSIONS_BROWSER_EXTENSION_FUNCTION_REGISTRY_H_
#define EXTENSIONS_BROWSER_EXTENSION_FUNCTION_REGISTRY_H_
#include <map>
#include <string>
#include <vector>
#include "extensions/browser/extension_function_histogram_value.h"
class ExtensionFunction;
// A factory function for creating new ExtensionFunction instances.
typedef ExtensionFunction* (*ExtensionFunctionFactory)();
// Template for defining ExtensionFunctionFactory.
template <class T>
ExtensionFunction* NewExtensionFunction() {
return new T();
}
// Contains a list of all known extension functions and allows clients to
// create instances of them.
class ExtensionFunctionRegistry {
public:
static ExtensionFunctionRegistry* GetInstance();
explicit ExtensionFunctionRegistry();
virtual ~ExtensionFunctionRegistry();
// Allows overriding of specific functions (e.g. for testing). Functions
// must be previously registered. Returns true if successful.
bool OverrideFunction(const std::string& name,
ExtensionFunctionFactory factory);
// Factory method for the ExtensionFunction registered as 'name'.
ExtensionFunction* NewFunction(const std::string& name);
template <class T>
void RegisterFunction() {
ExtensionFunctionFactory factory = &NewExtensionFunction<T>;
factories_[T::function_name()] =
FactoryEntry(factory, T::function_name(), T::histogram_value());
}
struct FactoryEntry {
public:
explicit FactoryEntry();
explicit FactoryEntry(
ExtensionFunctionFactory factory,
const char* function_name,
extensions::functions::HistogramValue histogram_value);
ExtensionFunctionFactory factory_;
const char* function_name_;
extensions::functions::HistogramValue histogram_value_;
};
typedef std::map<std::string, FactoryEntry> FactoryMap;
FactoryMap factories_;
};
#endif // EXTENSIONS_BROWSER_EXTENSION_FUNCTION_REGISTRY_H_
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