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// Copyright (C) 2021 The Qt Company Ltd.
// Copyright (C) 2019 Luxoft Sweden AB
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#ifndef CONFIGCACHE_H
#define CONFIGCACHE_H
#include <functional>
#include <array>
#include <QtCore/QPair>
#include <QtCore/QVector>
#include <QtCore/QStringList>
#include <QtCore/QVariant>
#include <QtCore/QIODevice>
#include <QtAppManCommon/global.h>
QT_BEGIN_NAMESPACE_AM
class ConfigCachePrivate;
template <typename T> class ConfigCacheAdaptor
{
public:
T *loadFromSource(QIODevice *source, const QString &fileName);
T *loadFromCache(QDataStream &ds);
void saveToCache(QDataStream &ds, const T *t);
void merge(T *to, const T *from) { *to = *from; }
};
class AbstractConfigCache
{
public:
enum Option {
None = 0x0,
MergedResult = 0x1,
NoCache = 0x2,
ClearCache = 0x4,
IgnoreBroken = 0x8,
};
Q_DECLARE_FLAGS(Options, Option)
AbstractConfigCache(const QStringList &configFiles, const QString &cacheBaseName,
std::array<char, 4> typeId, quint32 version = 0, Options options = None);
virtual ~AbstractConfigCache();
virtual void parse();
void *takeMergedResult() const;
void *takeResult(int index) const;
void *takeResult(const QString &rawFile) const;
void clear();
// mainly for debugging and auto tests
bool parseReadFromCache() const;
bool parseWroteToCache() const;
QString cacheFilePath() const;
protected:
virtual void *loadFromSource(QIODevice *source, const QString &fileName) = 0;
virtual void preProcessSourceContent(QByteArray &sourceContent, const QString &fileName) = 0;
virtual void *loadFromCache(QDataStream &ds) = 0;
virtual void saveToCache(QDataStream &ds, const void *t) = 0;
virtual void merge(void *to, const void *from) = 0;
virtual void *clone(void *t) = 0;
virtual void destruct(void *t) = 0;
private:
Q_DISABLE_COPY_MOVE(AbstractConfigCache)
ConfigCachePrivate *d;
};
template <typename T, typename ADAPTOR = ConfigCacheAdaptor<T>> class ConfigCache : public AbstractConfigCache
{
public:
using AbstractConfigCache::Option;
using AbstractConfigCache::Options;
ConfigCache(const QStringList &configFiles, const QString &cacheBaseName, std::array<char, 4> typeId,
quint32 typeVersion = 0, Options options = None)
: AbstractConfigCache(configFiles, cacheBaseName, typeId, typeVersion, options)
, m_adaptor()
{ }
~ConfigCache() override
{
clear();
}
void parse() override
{
AbstractConfigCache::parse();
}
T *takeMergedResult() const
{
return static_cast<T *>(AbstractConfigCache::takeMergedResult());
}
T *takeResult(int index) const
{
return static_cast<T *>(AbstractConfigCache::takeResult(index));
}
T *takeResult(const QString &yamlFile) const
{
return static_cast<T *>(AbstractConfigCache::takeResult(yamlFile));
}
protected:
void *loadFromSource(QIODevice *source, const QString &fileName) override
{ return m_adaptor.loadFromSource(source, fileName); }
void preProcessSourceContent(QByteArray &sourceContent, const QString &fileName) override
{ m_adaptor.preProcessSourceContent(sourceContent, fileName); }
void *loadFromCache(QDataStream &ds) override
{ return m_adaptor.loadFromCache(ds); }
void saveToCache(QDataStream &ds, const void *t) override
{ m_adaptor.saveToCache(ds, static_cast<const T *>(t)); }
void merge(void *to, const void *from) override
{ m_adaptor.merge(static_cast<T *>(to), static_cast<const T *>(from)); }
void *clone(void *t) override
{ return doClone(static_cast<T *>(t)); }
void destruct(void *t) override
{ delete static_cast<T *>(t); }
private:
ADAPTOR m_adaptor;
template <typename U = T> typename std::enable_if<std::is_copy_constructible<U>::value, void *>::type
doClone(T *t)
{ return new T(*static_cast<T *>(t)); }
template <typename U = T> typename std::enable_if<!std::is_copy_constructible<U>::value, void *>::type
doClone(T *)
{ Q_ASSERT_X(false, "ConfigCache::clone", "trying to clone non-copy-constructible content"); return nullptr; }
Q_DISABLE_COPY_MOVE(ConfigCache)
};
Q_DECLARE_OPERATORS_FOR_FLAGS(AbstractConfigCache::Options)
QT_END_NAMESPACE_AM
#endif // CONFIGCACHE_H
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