org.mapsforge.map.writer

Class OSMTagMapping

java.lang.Object

org.mapsforge.map.writer.OSMTagMapping

public final class OSMTagMapping
extends Object

Reorders and maps tag ids according to their frequency in the input data. Ids are remapped so that the most frequent entities receive the lowest ids.

Method Summary

Methods

Modifier and Type	Method and Description
static OSMTagMapping	getInstance()
static OSMTagMapping	getInstance(URL tagConf)
Map<Short,Short>	getOptimizedPoiIds()
Map<Short,Short>	getOptimizedWayIds()
OSMTag	getPoiTag(short id)
OSMTag	getPoiTag(String key, String value)
OSMTag	getWayTag(short id)
OSMTag	getWayTag(String key, String value)
byte	getZoomAppearPOI(short[] tagSet)
byte	getZoomAppearWay(short[] tagSet)
void	optimizePoiOrdering(gnu.trove.map.hash.TShortIntHashMap histogram)
void	optimizeWayOrdering(gnu.trove.map.hash.TShortIntHashMap histogram)

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static OSMTagMapping getInstance()

Returns:

a new instance

getInstance

public static OSMTagMapping getInstance(URL tagConf)

Parameters:

tagConf - the URL to a file that contains a tag configuration

Returns:

a new instance

getOptimizedPoiIds

public Map<Short,Short> getOptimizedPoiIds()

Returns:

a mapping that maps original tag ids to the optimized ones

getOptimizedWayIds

public Map<Short,Short> getOptimizedWayIds()

Returns:

a mapping that maps original tag ids to the optimized ones

getPoiTag

public OSMTag getPoiTag(short id)

Parameters:

id - the id

Returns:

the corresponding OSMTag

getPoiTag

public OSMTag getPoiTag(String key,
               String value)

Parameters:

key - the key

value - the value

Returns:

the corresponding OSMTag

getWayTag

public OSMTag getWayTag(short id)

Parameters:

id - the id

Returns:

the corresponding OSMTag

getWayTag

public OSMTag getWayTag(String key,
               String value)

Parameters:

key - the key

value - the value

Returns:

the corresponding OSMTag

getZoomAppearPOI

public byte getZoomAppearPOI(short[] tagSet)

Parameters:

tagSet - the tag set

Returns:

the minimum zoom level of all tags in the tag set

getZoomAppearWay

public byte getZoomAppearWay(short[] tagSet)

Parameters:

tagSet - the tag set

Returns:

the minimum zoom level of all the tags in the set

optimizePoiOrdering

public void optimizePoiOrdering(gnu.trove.map.hash.TShortIntHashMap histogram)

Parameters:

histogram - a histogram that represents the frequencies of tags

optimizeWayOrdering

public void optimizeWayOrdering(gnu.trove.map.hash.TShortIntHashMap histogram)

Parameters:

histogram - a histogram that represents the frequencies of tags