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# A minimal implementation of an MBTiles-formatted SQLite database
# cache access mechanism. (No writing, only reading.)
# See:
# http://mapbox.com/tools/mbtiles
# for more information on the mbtiles format; it is essentially a single
# table in a sqlite database with 4 columns:
# * tile_column
# * tile_row
# * zoom_level
# * tile_data
from TileCache.Cache import Cache
import os
import sqlite3
class MBTiles (Cache):
def __init__ (self, base = None, ext = None, umask = '002', **kwargs):
Cache.__init__(self, **kwargs)
self.basedir = base
self.ext = ext
def get (self, tile):
db = sqlite3.connect("%s.%s" % (os.path.join(self.basedir, tile.layer.name), self.ext))
c = db.cursor()
c.execute("select tile_data from tiles where tile_column=? and tile_row=? and zoom_level=?", (tile.x, tile.y, tile.z))
res = c.fetchone()
if res:
tile.data = str(res[0])
return tile.data
return None
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