third_party/WebKit/Source/platform/text/CompressibleString.h - Issue 2227933002: Revert CompressibleString (and its UMA)

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Issue 2227933002: Revert CompressibleString (and its UMA) (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Address on Ilya's review Created 4 years, 4 months ago

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1 // Copyright 2016 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 CompressibleString_h

6 #define CompressibleString_h

7

8 #include "platform/PlatformExport.h"

9 #include "wtf/RefCounted.h"

10 #include "wtf/text/Unicode.h"

11 #include "wtf/text/WTFString.h"

12

13 namespace blink {

14

15 // TODO(hajimehoshi): Now these classes are in platform/text to use UMA. Move

16 // them to wtf/text.

17

18 class PLATFORM_EXPORT CompressibleStringImpl final : public RefCounted<Compressi bleStringImpl> {

19 WTF_MAKE_NONCOPYABLE(CompressibleStringImpl);

20 public:

21 static void compressAll();

22

23 CompressibleStringImpl()

24 : m_string()

25 , m_isCompressed(false)

26 {

27 }

28

29 explicit CompressibleStringImpl(PassRefPtr<StringImpl>);

30 ~CompressibleStringImpl();

31

32 bool isEmpty() const { return originalLength() == 0; }

33

34 bool isCompressed() const { return m_isCompressed; }

35 unsigned originalLength() const { return m_string.length(); }

36 bool is8Bit() const { return m_string.is8Bit(); }

37

38 unsigned originalContentSizeInBytes() const

39 {

40 if (is8Bit())

41 return originalLength() * sizeof(LChar);

42 return originalLength() * sizeof(UChar);

43 }

44

45 // TODO(hajimehoshi): Update this once we implement compression.

46 unsigned currentSizeInBytes() const

47 {

48 return originalContentSizeInBytes();

49 }

50

51 const String& toString()

52 {

53 if (UNLIKELY(isCompressed()))

54 decompressString();

55 return m_string;

56 }

57

58 const LChar* characters8()

59 {

60 return toString().characters8();

61 }

62

63 const UChar* characters16()

64 {

65 return toString().characters16();

66 }

67

68 void compressString();

69 void decompressString();

70

71 private:

72 String m_string;

73 bool m_isCompressed;

74 };

75

76 class PLATFORM_EXPORT CompressibleString final {

77 public:

78 CompressibleString()

79 : m_impl(nullptr)

80 {

81 }

82

83 CompressibleString(const CompressibleString& rhs)

84 : m_impl(rhs.m_impl)

85 {

86 }

87

88 explicit CompressibleString(PassRefPtr<StringImpl> impl)

89 : m_impl(impl ? adoptRef(new CompressibleStringImpl(impl)) : nullptr)

90 {

91 }

92

93 bool isNull() const { return !m_impl; }

94 bool isEmpty() const { return isNull() \|\| m_impl->isEmpty(); }

95 unsigned length() const { return m_impl ? m_impl->originalLength() : 0; }

96

97 unsigned currentSizeInBytes() const { return m_impl ? m_impl->currentSizeInB ytes() : 0; }

98

99 bool isCompressed() const { return m_impl ? m_impl->isCompressed() : false; }

100 bool is8Bit() const { return m_impl ? m_impl->is8Bit() : false; }

101

102 const String& toString() const { return m_impl ? m_impl->toString() : emptyS tring(); }

103 const LChar* characters8() const { return m_impl ? m_impl->characters8() : n ullptr; }

104 const UChar* characters16() const { return m_impl ? m_impl->characters16() : nullptr; }

105

106 CompressibleStringImpl* impl() const { return m_impl.get(); }

107

108 private:

109 void compressString() const { m_impl->compressString(); }

110 void decompressString() const { m_impl->decompressString(); }

111

112 mutable RefPtr<CompressibleStringImpl> m_impl;

113 };

114

115 } // namespace blink

116

117 using blink::CompressibleString;

118 using blink::CompressibleStringImpl;

119

120 #endif

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