File: extension_function_registry.h

package info (click to toggle)
chromium 139.0.7258.127-1
  • links: PTS, VCS
  • area: main
  • in suites:
  • size: 6,122,068 kB
  • sloc: cpp: 35,100,771; ansic: 7,163,530; javascript: 4,103,002; python: 1,436,920; asm: 946,517; xml: 746,709; pascal: 187,653; perl: 88,691; sh: 88,436; objc: 79,953; sql: 51,488; cs: 44,583; fortran: 24,137; makefile: 22,147; tcl: 15,277; php: 13,980; yacc: 8,984; ruby: 7,485; awk: 3,720; lisp: 3,096; lex: 1,327; ada: 727; jsp: 228; sed: 36
file content (78 lines) | stat: -rw-r--r-- 2,652 bytes parent folder | download | duplicates (11)
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
// 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_