OpenShot Audio Library | OpenShotAudio: juce_StringPool.cpp Source File

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juce_StringPool.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23namespace juce
24{
25
26static const int minNumberOfStringsForGarbageCollection = 300;
27static const uint32 garbageCollectionInterval = 30000;
28
29
30StringPool::StringPool() noexcept : lastGarbageCollectionTime (0) {}
31
32struct StartEndString
33{
34 StartEndString (String::CharPointerType s, String::CharPointerType e) noexcept : start (s), end (e) {}
35 operator String() const { return String (start, end); }
36
37 String::CharPointerType start, end;
38};
39
40static int compareStrings (const String& s1, const String& s2) noexcept { return s1.compare (s2); }
41static int compareStrings (CharPointer_UTF8 s1, const String& s2) noexcept { return s1.compare (s2.getCharPointer()); }
42
43static int compareStrings (const StartEndString& string1, const String& string2) noexcept
44{
45 String::CharPointerType s1 (string1.start), s2 (string2.getCharPointer());
46
47 for (;;)
48 {
49 const int c1 = s1 < string1.end ? (int) s1.getAndAdvance() : 0;
50 const int c2 = (int) s2.getAndAdvance();
51 const int diff = c1 - c2;
52
53 if (diff != 0) return diff < 0 ? -1 : 1;
54 if (c1 == 0) break;
55 }
56
57 return 0;
58}
59
60template <typename NewStringType>
61static String addPooledString (Array<String>& strings, const NewStringType& newString)
62{
63 int start = 0;
64 int end = strings.size();
65
66 while (start < end)
67 {
68 const String& startString = strings.getReference (start);
69 const int startComp = compareStrings (newString, startString);
70
71 if (startComp == 0)
72 return startString;
73
74 const int halfway = (start + end) / 2;
75
76 if (halfway == start)
77 {
78 if (startComp > 0)
79 ++start;
80
81 break;
82 }
83
84 const String& halfwayString = strings.getReference (halfway);
85 const int halfwayComp = compareStrings (newString, halfwayString);
86
87 if (halfwayComp == 0)
88 return halfwayString;
89
90 if (halfwayComp > 0)
91 start = halfway;
92 else
93 end = halfway;
94 }
95
96 strings.insert (start, newString);
97 return strings.getReference (start);
98}
99
100 String StringPool::getPooledString (const char* const newString)
101{
102 if (newString == nullptr || *newString == 0)
103 return {};
104
105 const ScopedLock sl (lock);
106 garbageCollectIfNeeded();
107 return addPooledString (strings, CharPointer_UTF8 (newString));
108}
109
110 String StringPool::getPooledString (String::CharPointerType start, String::CharPointerType end)
111{
112 if (start.isEmpty() || start == end)
113 return {};
114
115 const ScopedLock sl (lock);
116 garbageCollectIfNeeded();
117 return addPooledString (strings, StartEndString (start, end));
118}
119
120 String StringPool::getPooledString (StringRef newString)
121{
122 if (newString.isEmpty())
123 return {};
124
125 const ScopedLock sl (lock);
126 garbageCollectIfNeeded();
127 return addPooledString (strings, newString.text);
128}
129
130 String StringPool::getPooledString (const String& newString)
131{
132 if (newString.isEmpty())
133 return {};
134
135 const ScopedLock sl (lock);
136 garbageCollectIfNeeded();
137 return addPooledString (strings, newString);
138}
139
140void StringPool::garbageCollectIfNeeded()
141{
142 if (strings.size() > minNumberOfStringsForGarbageCollection
143 && Time::getApproximateMillisecondCounter() > lastGarbageCollectionTime + garbageCollectionInterval)
144 garbageCollect();
145}
146
147 void StringPool::garbageCollect()
148{
149 const ScopedLock sl (lock);
150
151 for (int i = strings.size(); --i >= 0;)
152 if (strings.getReference (i).getReferenceCount() == 1)
153 strings.remove (i);
154
155 lastGarbageCollectionTime = Time::getApproximateMillisecondCounter();
156}
157
158 StringPool& StringPool::getGlobalPool() noexcept
159{
160 static StringPool pool;
161 return pool;
162}
163
164} // namespace juce
juce::CharPointer_UTF8
Definition juce_CharPointer_UTF8.h:35
juce::GenericScopedLock
Definition juce_ScopedLock.h:55
juce::StringPool
Definition juce_StringPool.h:40
juce::StringPool::getPooledString
String getPooledString(const String &original)
Definition juce_StringPool.cpp:130
juce::StringPool::StringPool
StringPool() noexcept
Definition juce_StringPool.cpp:30
juce::StringPool::getGlobalPool
static StringPool & getGlobalPool() noexcept
Definition juce_StringPool.cpp:158
juce::StringPool::garbageCollect
void garbageCollect()
Definition juce_StringPool.cpp:147
juce::StringRef
Definition juce_StringRef.h:62
juce::StringRef::text
String::CharPointerType text
Definition juce_StringRef.h:130
juce::StringRef::isEmpty
bool isEmpty() const noexcept
Definition juce_StringRef.h:101
juce::String
Definition juce_String.h:53
juce::String::isEmpty
bool isEmpty() const noexcept
Definition juce_String.h:310
juce::Time::getApproximateMillisecondCounter
static uint32 getApproximateMillisecondCounter() noexcept
Definition juce_Time.cpp:261