ElementsCollectionCache Class Reference

#include <elementscollectioncache.h>

Inherits QObject.

Collaboration diagram for ElementsCollectionCache:

Public Member Functions
	ElementsCollectionCache (const QString &database_path, QObject *=nullptr)
	~ElementsCollectionCache () override
void	setLocale (const QString &)
QString	locale () const
bool	setPixmapStorageFormat (const QString &)
QString	pixmapStorageFormat () const
bool	fetchElement (ElementsLocation &location)
	ElementsCollectionCache::fetchElement Retrieve the data for a given element, using the cache if available, filling it otherwise. Data are then available through pixmap() and name() methods.
QString	name () const
QPixmap	pixmap () const
bool	fetchData (const ElementsLocation &)
bool	fetchNameFromCache (const QString &path, const QUuid &uuid)
	ElementsCollectionCache::fetchNameFromCache Retrieve the name for an element, given its path and uuid The value is then available through the name() method.
bool	fetchPixmapFromCache (const QString &path, const QUuid &uuid)
	ElementsCollectionCache::fetchPixmapFromCache Retrieve the pixmap for an element, given its path and uuid. It is then available through the pixmap() method.
bool	cacheName (const QString &path, const QUuid &uuid=QUuid::createUuid())
	ElementsCollectionCache::cacheName Cache the current (i.e. last retrieved) name The cache entry will use the locale set via setLocale().
bool	cachePixmap (const QString &path, const QUuid &uuid=QUuid::createUuid())
	ElementsCollectionCache::cachePixmap Cache the current (i.e. last retrieved) pixmap.

Private Attributes
QSqlDatabase	cache_db_
	Object providing access to the SQLite database this cache relies on.
QSqlQuery *	select_name_
	Prepared statement to fetch names from the cache.
QSqlQuery *	select_pixmap_
	Prepared statement to fetch pixmaps from the cache.
QSqlQuery *	insert_name_
	Prepared statement to insert names into the cache.
QSqlQuery *	insert_pixmap_
	Prepared statement to insert pixmaps into the cache.
QString	locale_
	Locale to be used when dealing with names.
QString	pixmap_storage_format_
	Storage format for cached pixmaps.
QString	current_name_
	Last name fetched.
QPixmap	current_pixmap_
	Last pixmap fetched.

Detailed Description

This class implements a SQLite cache for data related to elements collections, mainly names and pixmaps. This avoids the cost of parsing XML definitions of elements and building full CustomElement objects when (re)loading the elements panel.

Constructor & Destructor Documentation

ElementsCollectionCache()

ElementsCollectionCache::ElementsCollectionCache	(	const QString &	database_path,
		QObject *	parent = nullptr
	)

Construct a cache for elements collections.

Parameters

database_path	Path of the SQLite database to open.
parent	Parent QObject

~ElementsCollectionCache()

ElementsCollectionCache::~ElementsCollectionCache ( )

override

Destructor

Member Function Documentation

cacheName()

bool ElementsCollectionCache::cacheName	(	const QString &	path,
		const QUuid &	uuid = QUuid::createUuid()
	)

ElementsCollectionCache::cacheName Cache the current (i.e. last retrieved) name The cache entry will use the locale set via setLocale().

Parameters

path	: Element path (as obtained using ElementsLocation::toString())
uuid	:Element uuid

Returns

True if the caching succeeded, false otherwise.

See also

name()

Here is the caller graph for this function:

cachePixmap()

bool ElementsCollectionCache::cachePixmap	(	const QString &	path,
		const QUuid &	uuid = QUuid::createUuid()
	)

ElementsCollectionCache::cachePixmap Cache the current (i.e. last retrieved) pixmap.

Parameters

path	: Element path (as obtained using ElementsLocation::toString())
uuid	: Element uuid

Returns

True if the caching succeeded, false otherwise.

See also

pixmap()

Here is the caller graph for this function:

fetchData()

bool ElementsCollectionCache::fetchData

(

const ElementsLocation &

location

)

Retrieve the data by building the full CustomElement object matching the given location, without using the cache. Data are then available through pixmap() and name() methods.

Parameters

location

Location of a given Element.

Returns

True if the retrieval succeeded, false otherwise.

Here is the call graph for this function:

Here is the caller graph for this function:

fetchElement()

bool ElementsCollectionCache::fetchElement

(

ElementsLocation &

location

)

ElementsCollectionCache::fetchElement Retrieve the data for a given element, using the cache if available, filling it otherwise. Data are then available through pixmap() and name() methods.

Parameters

location

The definition of an element.

See also

pixmap()

name()

Returns

True if the retrieval succeeded, false otherwise.

Here is the call graph for this function:

Here is the caller graph for this function:

fetchNameFromCache()

bool ElementsCollectionCache::fetchNameFromCache	(	const QString &	path,
		const QUuid &	uuid
	)

ElementsCollectionCache::fetchNameFromCache Retrieve the name for an element, given its path and uuid The value is then available through the name() method.

Parameters

path	: Element path (as obtained using ElementsLocation::toString())
uuid	: Element uuid

Returns

True if the retrieval succeeded, false otherwise.

Here is the caller graph for this function:

fetchPixmapFromCache()

bool ElementsCollectionCache::fetchPixmapFromCache	(	const QString &	path,
		const QUuid &	uuid
	)

ElementsCollectionCache::fetchPixmapFromCache Retrieve the pixmap for an element, given its path and uuid. It is then available through the pixmap() method.

Parameters

path	: Element path (as obtained using ElementsLocation::toString())
uuid	: Element uuid

Returns

True if the retrieval succeeded, false otherwise.

Here is the caller graph for this function:

locale()

QString ElementsCollectionCache::locale

(

)

const

Returns

The locale to be used when dealing with names.

Here is the caller graph for this function:

name()

QString ElementsCollectionCache::name

(

)

const

Returns

The last name fetched through fetchElement().

Here is the caller graph for this function:

pixmap()

QPixmap ElementsCollectionCache::pixmap

(

)

const

Returns

The last pixmap fetched through fetchElement().

Here is the caller graph for this function:

pixmapStorageFormat()

QString ElementsCollectionCache::pixmapStorageFormat

(

)

const

Returns

the pixmap storage format. Default is "PNG"

See also

setPixmapStorageFormat()

setLocale()

void ElementsCollectionCache::setLocale

(

const QString &

locale

)

Define the locale to be used when dealing with names.

Parameters

locale

New locale to be used.

Here is the call graph for this function:

Here is the caller graph for this function:

setPixmapStorageFormat()

bool ElementsCollectionCache::setPixmapStorageFormat

(

const QString &

format

)

Define the storage format for the pixmaps within the SQLite database. See Qt's QPixmap documentation for more information.

Parameters

format

The new pixmap storage format.

Returns

True if the format change was accepted, false otherwise.

Member Data Documentation

cache_db_

QSqlDatabase ElementsCollectionCache::cache_db_

private

Object providing access to the SQLite database this cache relies on.

current_name_

QString ElementsCollectionCache::current_name_

private

Last name fetched.

current_pixmap_

QPixmap ElementsCollectionCache::current_pixmap_

private

Last pixmap fetched.

insert_name_

QSqlQuery* ElementsCollectionCache::insert_name_

private

Prepared statement to insert names into the cache.

insert_pixmap_

QSqlQuery* ElementsCollectionCache::insert_pixmap_

private

Prepared statement to insert pixmaps into the cache.

locale_

QString ElementsCollectionCache::locale_

private

Locale to be used when dealing with names.

pixmap_storage_format_

QString ElementsCollectionCache::pixmap_storage_format_

private

Storage format for cached pixmaps.

select_name_

QSqlQuery* ElementsCollectionCache::select_name_

private

Prepared statement to fetch names from the cache.

select_pixmap_

QSqlQuery* ElementsCollectionCache::select_pixmap_

private

Prepared statement to fetch pixmaps from the cache.

---

The documentation for this class was generated from the following files:

• sources/elementscollectioncache.h
• sources/elementscollectioncache.cpp