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juce_StringPool.cpp
/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2022 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
The code included in this file is provided under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license. Permission
To use, copy, modify, and/or distribute this software for any purpose with or
without fee is hereby granted provided that the above copyright notice and
this permission notice appear in all copies.
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
static const int minNumberOfStringsForGarbageCollection = 300;
static const uint32 garbageCollectionInterval = 30000;
StringPool::StringPool() noexcept : lastGarbageCollectionTime (0) {}
struct StartEndString
{
StartEndString (String::CharPointerType s, String::CharPointerType e) noexcept : start (s), end (e) {}
operator String() const { return String (start, end); }
String::CharPointerType start, end;
};
static int compareStrings (const String& s1, const String& s2) noexcept { return s1.compare (s2); }
static int compareStrings (CharPointer_UTF8 s1, const String& s2) noexcept { return s1.compare (s2.getCharPointer()); }
static int compareStrings (const StartEndString& string1, const String& string2) noexcept
{
String::CharPointerType s1 (string1.start), s2 (string2.getCharPointer());
for (;;)
{
const int c1 = s1 < string1.end ? (int) s1.getAndAdvance() : 0;
const int c2 = (int) s2.getAndAdvance();
const int diff = c1 - c2;
if (diff != 0) return diff < 0 ? -1 : 1;
if (c1 == 0) break;
}
return 0;
}
template <typename NewStringType>
static String addPooledString (Array<String>& strings, const NewStringType& newString)
{
int start = 0;
int end = strings.size();
while (start < end)
{
const String& startString = strings.getReference (start);
const int startComp = compareStrings (newString, startString);
if (startComp == 0)
return startString;
const int halfway = (start + end) / 2;
if (halfway == start)
{
if (startComp > 0)
++start;
break;
}
const String& halfwayString = strings.getReference (halfway);
const int halfwayComp = compareStrings (newString, halfwayString);
if (halfwayComp == 0)
return halfwayString;
if (halfwayComp > 0)
start = halfway;
else
end = halfway;
}
strings.insert (start, newString);
return strings.getReference (start);
}
String StringPool::getPooledString (const char* const newString)
{
if (newString == nullptr || *newString == 0)
return {};
const ScopedLock sl (lock);
garbageCollectIfNeeded();
return addPooledString (strings, CharPointer_UTF8 (newString));
}
String StringPool::getPooledString (String::CharPointerType start, String::CharPointerType end)
{
if (start.isEmpty() || start == end)
return {};
const ScopedLock sl (lock);
garbageCollectIfNeeded();
return addPooledString (strings, StartEndString (start, end));
}
String StringPool::getPooledString (StringRef newString)
{
if (newString.isEmpty())
return {};
const ScopedLock sl (lock);
garbageCollectIfNeeded();
return addPooledString (strings, newString.text);
}
String StringPool::getPooledString (const String& newString)
{
if (newString.isEmpty())
return {};
const ScopedLock sl (lock);
garbageCollectIfNeeded();
return addPooledString (strings, newString);
}
void StringPool::garbageCollectIfNeeded()
{
if (strings.size() > minNumberOfStringsForGarbageCollection
&& Time::getApproximateMillisecondCounter() > lastGarbageCollectionTime + garbageCollectionInterval)
garbageCollect();
}
void StringPool::garbageCollect()
{
const ScopedLock sl (lock);
for (int i = strings.size(); --i >= 0;)
if (strings.getReference (i).getReferenceCount() == 1)
strings.remove (i);
lastGarbageCollectionTime = Time::getApproximateMillisecondCounter();
}
StringPool& StringPool::getGlobalPool() noexcept
{
static StringPool pool;
return pool;
}
} // namespace juce
juce::Array
Definition juce_Array.h:56
juce::CharPointer_UTF8
Definition juce_CharPointer_UTF8.h:35
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