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package cgeo.geocaching;
import cgeo.geocaching.DataStore.StorageLocation;
import cgeo.geocaching.connector.gc.Tile;
import cgeo.geocaching.enumerations.CacheType;
import cgeo.geocaching.geopoint.Viewport;
import cgeo.geocaching.utils.LeastRecentlyUsedMap;
import cgeo.geocaching.utils.LeastRecentlyUsedMap.RemoveHandler;
import cgeo.geocaching.utils.Log;
import org.apache.commons.lang3.StringUtils;
import java.util.HashSet;
import java.util.Set;
/**
* Cache for Caches. Every cache is stored in memory while c:geo is active to
* speed up the app and to minimize network request - which are slow.
*/
public class CacheCache {
private static final int MAX_CACHED_CACHES = 1000;
final private LeastRecentlyUsedMap<String, Geocache> cachesCache;
public CacheCache() {
cachesCache = new LeastRecentlyUsedMap.LruCache<>(MAX_CACHED_CACHES);
cachesCache.setRemoveHandler(new CacheRemoveHandler());
}
public synchronized void removeAllFromCache() {
cachesCache.clear();
}
/**
* @param geocode
* Geocode of the cache to remove from the cache
*/
public void removeCacheFromCache(final String geocode) {
if (StringUtils.isBlank(geocode)) {
throw new IllegalArgumentException("geocode must not be empty");
}
synchronized(this) {
cachesCache.remove(geocode);
}
}
/**
* "Store" a cache in the CacheCache. If the cache is already in the CacheCache the cache gets replaced.
*
* @param cache
* Cache
*
*/
public void putCacheInCache(final Geocache cache) {
if (cache == null) {
throw new IllegalArgumentException("cache must not be null");
}
if (StringUtils.isBlank(cache.getGeocode())) {
throw new IllegalArgumentException("geocode must not be empty");
}
synchronized(this) {
cache.addStorageLocation(StorageLocation.CACHE);
cachesCache.put(cache.getGeocode(), cache);
}
}
/**
* @param geocode
* Geocode of the cache to retrieve from the cache
* @return cache if found, null else
*/
public Geocache getCacheFromCache(final String geocode) {
if (StringUtils.isBlank(geocode)) {
throw new IllegalArgumentException("geocode must not be empty");
}
synchronized(this) {
return cachesCache.get(geocode);
}
}
public synchronized Set<String> getInViewport(final Viewport viewport, final CacheType cacheType) {
final Set<String> geocodes = new HashSet<>();
for (final Geocache cache : cachesCache.values()) {
if (cache.getCoords() == null) {
// FIXME: this kludge must be removed, it is only present to help us debug the cases where
// caches contain null coordinates.
Log.e("CacheCache.getInViewport: got cache with null coordinates: " + cache.getGeocode());
continue;
}
if (cacheType.contains(cache) && viewport.contains(cache)) {
geocodes.add(cache.getGeocode());
}
}
return geocodes;
}
@Override
public synchronized String toString() {
return StringUtils.join(cachesCache.keySet(), ' ');
}
private static class CacheRemoveHandler implements RemoveHandler<Geocache> {
@Override
public void onRemove(final Geocache removed) {
// FIXME: as above, we sometimes get caches with null coordinates, that may then provoke
// a NullPointerException down the invocation chain.
if (removed.getCoords() != null) {
Tile.cache.removeFromTileCache(removed);
}
}
}
}
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