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#include "tilecache.h"
#include <QDir>
#include <QRegExp>
#include <QDebug>
TileCache::TileCache(const QString &directory,
QObject *parent)
: QObject(parent),
directory_(directory),
waitingForPrefetchedTiles_(false),
tilesOutstanding_(0)
{
if (directory_.isEmpty()) {
QDir home = QDir::home();
if (!home.exists(".tilecache"))
home.mkdir(".tilecache");
directory_ = home.filePath(".tilecache");
}
provider_ = new TileProvider(this);
connect(provider_,
SIGNAL(tileReady(Tile)),
this,
SLOT(insert(Tile)));
connect(provider_,
SIGNAL(tileError(TileSpec)),
this,
SLOT(handleError(TileSpec)));
loadTiles();
}
void TileCache::prefetch(const TileSpec &spec)
{
if (!cache_.contains(spec)) {
provider_->tileRequest(spec);
++tilesOutstanding_;
}
}
void TileCache::waitForPrefetchedTiles()
{
if (tilesOutstanding_ == 0)
emit prefetchingFinished();
else
waitingForPrefetchedTiles_ = true;
}
Tile TileCache::get(const TileSpec &spec) const
{
return cache_.value(spec);
}
void TileCache::insert(const Tile &tile)
{
QString filename = tileSpecToFilename(tile.tileSpec());
tile.pixmap().save(filename, "png");
cache_.insert(tile.tileSpec(), tile);
updateWaitingStatus();
}
void TileCache::handleError(const TileSpec &)
{
updateWaitingStatus();
}
void TileCache::updateWaitingStatus()
{
--tilesOutstanding_;
if (waitingForPrefetchedTiles_ && (tilesOutstanding_ == 0)) {
emit prefetchingFinished();
waitingForPrefetchedTiles_ = false;
}
}
void TileCache::loadTiles()
{
QStringList formats;
formats << "*.png";
QDir dir(directory_);
QStringList files = dir.entryList(formats);
for (int i = 0; i < files.size(); ++i) {
TileSpec spec = filenameToTileSpec(files.at(i));
if (spec.zoom() == -1)
continue;
QPixmap pixmap;
pixmap.load(dir.filePath(files.at(i)), "png");
Tile tile(spec, pixmap);
cache_.insert(tile.tileSpec(), tile);
}
}
QString TileCache::tileSpecToFilename(const TileSpec &spec) const
{
QString filename = QString::number(spec.zoom());
filename += "-";
filename += QString::number(spec.x());
filename += "-";
filename += QString::number(spec.y());
filename += ".png";
QDir dir = QDir(directory_);
return dir.filePath(filename);
}
TileSpec TileCache::filenameToTileSpec(const QString &filename) const
{
TileSpec spec;
QRegExp r("(\\d+)-(\\d+)-(\\d+).png");
int index = r.indexIn(filename);
if (index != -1) {
bool ok = false;
int zoom = r.cap(1).toInt(&ok);
if (!ok)
return spec;
ok = false;
int x = r.cap(2).toInt(&ok);
if (!ok)
return spec;
ok = false;
int y = r.cap(3).toInt(&ok);
if (!ok)
return spec;
spec.setZoom(zoom);
spec.setX(x);
spec.setY(y);
}
return spec;
}
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