QgsAbstractContentCacheEntry class

Base class for entries in a QgsAbstractContentCache.

Contents

Subclasses must take care to correctly implement the isEqual() method, applying their own logic for testing extra cache properties (e.g. image size for an image-based cache).

Constructors, destructors, conversion operators

QgsAbstractContentCacheEntry(const QString& path)
Constructor for QgsAbstractContentCacheEntry for an entry relating to the specified path.
QgsAbstractContentCacheEntry(const QgsAbstractContentCacheEntry& rh) deleted
QgsAbstractContentCacheEntry cannot be copied.

Public functions

auto dataSize() const -> int pure virtual
Returns the memory usage in bytes for the entry.
void dump() const pure virtual
Dumps debugging strings containing the item's properties.
auto operator=(const QgsAbstractContentCacheEntry& rh) -> QgsAbstractContentCacheEntry& deleted
QgsAbstractContentCacheEntry cannot be copied.

Public variables

QDateTime fileModified
Timestamp when file was last modified.
QElapsedTimer fileModifiedLastCheckTimer
Time since last check of file modified date.
int mFileModifiedCheckTimeout
Timeout before re-checking whether the file modified date has changed.
QgsAbstractContentCacheEntry* nextEntry
Entries are kept on a linked list, sorted by last access.
QString path
Represents the absolute path to a file, a remote URL, or a base64 encoded string.
QgsAbstractContentCacheEntry* previousEntry
Entries are kept on a linked list, sorted by last access.

Protected functions

auto isEqual(const QgsAbstractContentCacheEntry* other) const -> bool pure virtual
Tests whether this entry matches another entry.

Function documentation

void QgsAbstractContentCacheEntry::dump() const pure virtual

Dumps debugging strings containing the item's properties.

For testing purposes only.

bool QgsAbstractContentCacheEntry::isEqual(const QgsAbstractContentCacheEntry* other) const pure virtual protected

Tests whether this entry matches another entry.

Subclasses must take care to check that the type of other is of a matching class, and then test extra cache-specific properties, such as image size.

Variable documentation

QgsAbstractContentCacheEntry* QgsAbstractContentCacheEntry::nextEntry

Entries are kept on a linked list, sorted by last access.

This point refers to the next entry in the cache.

QgsAbstractContentCacheEntry* QgsAbstractContentCacheEntry::previousEntry

Entries are kept on a linked list, sorted by last access.

This point refers to the previous entry in the cache.