Fix for Issue 96 : need API to clear map tile cache

@@ -111,7 +111,6 @@
 
 -(void) didReceiveMemoryWarning
 {
-	LogMethod();
 }
 
 -(NSString *)uniqueTilecacheKey
@@ -136,5 +135,8 @@
 	return [self shortAttribution];
 }
 
+-(void) purgeAllTiles
+{
+}
 @end
 

@@ -105,7 +105,6 @@
 
 - (void) didReceiveMemoryWarning
 {
-	LogMethod();
 	[cache didReceiveMemoryWarning];
 }
 
@@ -146,4 +145,9 @@
   return [tileSource tilePath];
 }
 
+-(void) purgeAllTiles
+{
+	[cache purgeAllTiles];
+}
+
 @end

@@ -163,7 +163,6 @@
 
 -(void)didReceiveMemoryWarning
 {
-	LogMethod();
 	if (self.databasePath==nil) {
 		RMLog(@"unknown db path, unable to reinitialize dao!");
 		return;
@@ -176,4 +175,9 @@
 
 }
 
+-(void) purgeAllTiles 
+{
+	[dao purgeAllTiles];
+}
+
 @end

@@ -66,7 +66,6 @@
 
 -(void) didReceiveMemoryWarning
 {
-	LogMethod();
 	[cache removeAllObjects];
 }
 
@@ -128,4 +127,9 @@
 	[cache setObject:image forKey:key];
 }
 
+-(void) purgeAllTiles 
+{
+	[cache removeAllObjects];
+}
+
 @end

@@ -39,13 +39,14 @@ typedef enum {
 
 @protocol RMTileCache<NSObject>
 
-/// Returns the cached image if it exists. nil otherwise.
+// Returns the cached image if it exists. nil otherwise.
 -(RMTileImage*) cachedImage:(RMTile)tile;
 -(void)didReceiveMemoryWarning;
 
 @optional
 
 -(void)addTile: (RMTile)tile WithImage: (RMTileImage*)image;
+-(void)purgeAllTiles;
 
 @end
 
@@ -59,12 +60,13 @@ typedef enum {
 
 +(NSNumber*) tileHash: (RMTile)tile;
 
-/// Add tile to cache
+// Add tile to cache
 -(void)addTile: (RMTile)tile WithImage: (RMTileImage*)image;
 
-/// Add another cache to the chain
+// Add another cache to the chain
 -(void)addCache: (id<RMTileCache>)cache;
 
 -(void)didReceiveMemoryWarning;
 
+
 @end

@@ -133,13 +133,19 @@
 
 -(void)didReceiveMemoryWarning
 {
-	LogMethod();
 	for (id<RMTileCache> cache in caches)
 	{
 		[cache didReceiveMemoryWarning];
 	}
 }
 
+-(void) purgeAllTiles
+{
+	for (id<RMTileCache> cache in caches)
+	{
+		[cache purgeAllTiles];
+	}
+}
 @end
 
 @implementation RMTileCache ( Configuration )

@@ -40,6 +40,7 @@
 -(void) touchTile: (uint64_t) tileHash withDate: (NSDate*) date;
 -(void) addData: (NSData*) data LastUsed: (NSDate*)date ForTile: (uint64_t) tileHash;
 -(void) purgeTiles: (NSUInteger) count;
+-(void) purgeAllTiles;
 
 //-(NSArray*) getLocalTimetableInformationAt: (int)stopId;
 

@@ -122,6 +122,14 @@
 	
 }
 
+-(void) purgeAllTiles 
+{
+	BOOL result = [db executeUpdate: @"DELETE FROM ZCACHE"];
+	if (result == NO) {
+		RMLog(@"Error purging all cache");
+	}	
+}
+
 -(void) touchTile: (uint64_t) tileHash withDate: (NSDate*) date
 {
 	BOOL result = [db executeUpdate: @"UPDATE ZCACHE SET zlastUsed = ? WHERE ztileHash = ? ", 

@@ -58,4 +58,6 @@
 -(NSString *)shortAttribution;
 -(NSString *)longAttribution;
 
+-(void)purgeAllTiles;
+
 @end