org.oscim.tiling.source.mapfile

Class MapDatabase

java.lang.Object

org.oscim.tiling.source.mapfile.MapDatabase

All Implemented Interfaces:

ITileDataSource

public class MapDatabase
extends java.lang.Object
implements ITileDataSource

A class for reading binary map files.

See Also:

Specification

Field Summary

Fields

Modifier and Type	Field and Description
static int	SIMPLIFICATION_MAX_ZOOM
static int	SIMPLIFICATION_MIN_ZOOM Reduce points on-the-fly while reading from map files.
static int	wayFilterDistance
static boolean	wayFilterEnabled Way filtering reduces the number of ways returned to only those that are relevant for the tile requested, leading to performance gains, but can cause line clipping artifacts (particularly at higher zoom levels).

Constructor Summary

Constructors

Constructor and Description
MapDatabase(MapFileTileSource tileSource)

Method Summary

Modifier and Type	Method and Description
void	cancel() Implementations should cancel their IO work and return
void	dispose() Implementations should cancel and release all resources
MapFileTileSource	getTileSource()
void	query(MapTile tile, ITileDataSink sink)
MapReadResult	readLabels(Tile tile) Reads only labels for tile.
MapReadResult	readLabels(Tile upperLeft, Tile lowerRight) Reads data for an area defined by the tile in the upper left and the tile in the lower right corner.
MapReadResult	readMapData(Tile tile) Reads all map data for the area covered by the given tile at the tile zoom level.
MapReadResult	readMapData(Tile upperLeft, Tile lowerRight) Reads data for an area defined by the tile in the upper left and the tile in the lower right corner.
MapReadResult	readPoiData(Tile tile) Reads only POI data for tile.
MapReadResult	readPoiData(Tile upperLeft, Tile lowerRight) Reads POI data for an area defined by the tile in the upper left and the tile in the lower right corner.
void	restrictToZoomRange(int minZoom, int maxZoom) Restricts returns of data to zoom level range specified.
boolean	supportsTile(Tile tile) Returns true if MapDatabase contains tile.
boolean	wayAsLabelTagFilter(java.util.List<Tag> tags) Returns true if a way should be included in the result set for readLabels() By default only ways with names, house numbers or a ref are included in the result set of readLabels().

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

wayFilterEnabled

public static boolean wayFilterEnabled

Way filtering reduces the number of ways returned to only those that are relevant for the tile requested, leading to performance gains, but can cause line clipping artifacts (particularly at higher zoom levels). The risk of clipping can be reduced by either turning way filtering off or by increasing the wayFilterDistance which governs how large an area surrounding the requested tile will be returned. For most use cases the standard settings should be sufficient.

wayFilterDistance

public static int wayFilterDistance

SIMPLIFICATION_MIN_ZOOM

public static int SIMPLIFICATION_MIN_ZOOM

Reduce points on-the-fly while reading from map files.

SIMPLIFICATION_MAX_ZOOM

public static int SIMPLIFICATION_MAX_ZOOM

Constructor Detail

MapDatabase

public MapDatabase(MapFileTileSource tileSource)
            throws java.io.IOException

Throws:

java.io.IOException

Method Detail

getTileSource

public MapFileTileSource getTileSource()

query

public void query(MapTile tile,
                  ITileDataSink sink)

Specified by:

query in interface ITileDataSource

Parameters:

tile - the tile to load.

sink - the callback to handle the extracted map elements.

dispose

public void dispose()

Description copied from interface: ITileDataSource

Implementations should cancel and release all resources

Specified by:

dispose in interface ITileDataSource

cancel

public void cancel()

Description copied from interface: ITileDataSource

Implementations should cancel their IO work and return

Specified by:

cancel in interface ITileDataSource

readLabels

public MapReadResult readLabels(Tile tile)

Reads only labels for tile.

Parameters:

tile - tile for which data is requested.

Returns:

label data for the tile.

readLabels

public MapReadResult readLabels(Tile upperLeft,
                                Tile lowerRight)

Reads data for an area defined by the tile in the upper left and the tile in the lower right corner. Precondition: upperLeft.tileX <= lowerRight.tileX && upperLeft.tileY <= lowerRight.tileY

Parameters:

upperLeft - tile that defines the upper left corner of the requested area.

lowerRight - tile that defines the lower right corner of the requested area.

Returns:

map data for the tile.

readMapData

public MapReadResult readMapData(Tile tile)

Reads all map data for the area covered by the given tile at the tile zoom level.

Parameters:

tile - defines area and zoom level of read map data.

Returns:

the read map data.

readMapData

public MapReadResult readMapData(Tile upperLeft,
                                 Tile lowerRight)

Reads data for an area defined by the tile in the upper left and the tile in the lower right corner. Precondition: upperLeft.tileX <= lowerRight.tileX && upperLeft.tileY <= lowerRight.tileY

Parameters:

upperLeft - tile that defines the upper left corner of the requested area.

lowerRight - tile that defines the lower right corner of the requested area.

Returns:

map data for the tile.

readPoiData

public MapReadResult readPoiData(Tile tile)

Reads only POI data for tile.

Parameters:

tile - tile for which data is requested.

Returns:

POI data for the tile.

readPoiData

public MapReadResult readPoiData(Tile upperLeft,
                                 Tile lowerRight)

Reads POI data for an area defined by the tile in the upper left and the tile in the lower right corner. This implementation takes the data storage of a MapFile into account for greater efficiency.

Parameters:

upperLeft - tile that defines the upper left corner of the requested area.

lowerRight - tile that defines the lower right corner of the requested area.

Returns:

map data for the tile.

restrictToZoomRange

public void restrictToZoomRange(int minZoom,
                                int maxZoom)

Restricts returns of data to zoom level range specified. This can be used to restrict the use of this map data base when used in MultiMapDatabase settings.

Parameters:

minZoom - minimum zoom level supported

maxZoom - maximum zoom level supported

supportsTile

public boolean supportsTile(Tile tile)

Returns true if MapDatabase contains tile.

Parameters:

tile - tile to be rendered.

Returns:

true if tile is part of database.

wayAsLabelTagFilter

public boolean wayAsLabelTagFilter(java.util.List<Tag> tags)

Returns true if a way should be included in the result set for readLabels() By default only ways with names, house numbers or a ref are included in the result set of readLabels(). This is to reduce the set of ways as much as possible to save memory.

Parameters:

tags - the tags associated with the way

Returns:

true if the way should be included in the result set