eu.slipo.athenarc.triplegeo.osm

Class OSMDiskIndex

java.lang.Object

eu.slipo.athenarc.triplegeo.osm.OSMDiskIndex

All Implemented Interfaces:

OSMIndex

public class OSMDiskIndex
extends java.lang.Object
implements OSMIndex

Support for disk-based indexing of OSM elements.

Version:

2.0

Author:

Kostas Patroumpas

Field Summary

Fields

Modifier and Type	Field and Description
private org.mapdb.DB	db
(package private) byte[]	empty
private org.mapdb.HTreeMap<java.lang.String,byte[]>	index
private com.vividsolutions.jts.io.WKBReader	reader
(package private) static java.lang.ThreadLocal<com.vividsolutions.jts.io.WKBReader>	wkbReader Thread-safe WKB reader
(package private) static java.lang.ThreadLocal<com.vividsolutions.jts.io.WKBWriter>	wkbWriter Thread-safe WKB writer
private com.vividsolutions.jts.io.WKBWriter	writer

Constructor Summary

Constructors

Constructor and Description
OSMDiskIndex(java.lang.String tmpDir, java.lang.String dbName) Constructor of this class.

Method Summary

Modifier and Type	Method and Description
void	clear() Erases all contents of the index and closes the respective file on disk.
boolean	containsKey(java.lang.String k) Checks whether the index contains an entry with the given key value.
com.vividsolutions.jts.geom.Geometry	get(java.lang.String k) Provides the geometry indexed under the given (unique) key value.
void	print() Print the contents of the index to standard output.
void	put(java.lang.String k, com.vividsolutions.jts.geom.Geometry g) Inserts (or updates) an entry into the index with the given key value and geometry.
void	putAll(java.util.Map<java.lang.String,com.vividsolutions.jts.geom.Geometry> m) Inserts a collection of geometries into the index.
int	size() Provides the count of entries in the index.

Methods inherited from class java.lang.Object

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

Field Detail

wkbReader

static java.lang.ThreadLocal<com.vividsolutions.jts.io.WKBReader> wkbReader

Thread-safe WKB reader

wkbWriter

static java.lang.ThreadLocal<com.vividsolutions.jts.io.WKBWriter> wkbWriter

Thread-safe WKB writer

db

private org.mapdb.DB db

index

private org.mapdb.HTreeMap<java.lang.String,byte[]> index

reader

private com.vividsolutions.jts.io.WKBReader reader

writer

private com.vividsolutions.jts.io.WKBWriter writer

empty

byte[] empty

Constructor Detail

OSMDiskIndex

public OSMDiskIndex(java.lang.String tmpDir,
                    java.lang.String dbName)

Constructor of this class.

Parameters:

tmpDir - Directory that will hold the disk-based indices to be created; once transformation is complete, these files will be erased.

dbName - Name of the file that will hold the created index.

Method Detail

put

public void put(java.lang.String k,
                com.vividsolutions.jts.geom.Geometry g)

Inserts (or updates) an entry into the index with the given key value and geometry.

Specified by:

put in interface OSMIndex

Parameters:

k - The key value of the entry.

g - The geometry of the entry.

get

public com.vividsolutions.jts.geom.Geometry get(java.lang.String k)

Provides the geometry indexed under the given (unique) key value.

Specified by:

get in interface OSMIndex

Parameters:

k - The key value to find.

Returns:

The geometry of the indexed entry with the specified key.

clear

public void clear()

Erases all contents of the index and closes the respective file on disk.

Specified by:

clear in interface OSMIndex

size

public int size()

Provides the count of entries in the index.

Specified by:

size in interface OSMIndex

Returns:

An integer value representing the total count.

containsKey

public boolean containsKey(java.lang.String k)

Checks whether the index contains an entry with the given key value.

Specified by:

containsKey in interface OSMIndex

Parameters:

k - A key value to check with the index contents.

Returns:

True if there is an entry with that key; otherwise, False.

putAll

public void putAll(java.util.Map<java.lang.String,com.vividsolutions.jts.geom.Geometry> m)

Inserts a collection of geometries into the index.

Specified by:

putAll in interface OSMIndex

Parameters:

m - Collection of geometries with their keys (string values).

print

public void print()

Print the contents of the index to standard output.

Specified by:

print in interface OSMIndex