org.apache.lucene.spatial.prefix.tree
Class SpatialPrefixTreeFactory

java.lang.Object
  org.apache.lucene.spatial.prefix.tree.SpatialPrefixTreeFactory

Direct Known Subclasses:

GeohashPrefixTree.Factory, QuadPrefixTree.Factory

public abstract class SpatialPrefixTreeFactory
extends Object

Abstract Factory for creating SpatialPrefixTree instances with useful defaults and passed on configurations defined in a Map.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

protected Map<String,String>	args
protected com.spatial4j.core.context.SpatialContext	ctx
static String	MAX_DIST_ERR
static String	MAX_LEVELS
protected Integer	maxLevels
static String	PREFIX_TREE

Constructor Summary

SpatialPrefixTreeFactory()

Method Summary

protected abstract int	getLevelForDistance(double degrees) Calls SpatialPrefixTree.getLevelForDistance(double).
protected void	init(Map<String,String> args, com.spatial4j.core.context.SpatialContext ctx)
protected void	initMaxLevels()
static SpatialPrefixTree	makeSPT(Map<String,String> args, ClassLoader classLoader, com.spatial4j.core.context.SpatialContext ctx) The factory is looked up via "prefixTree" in args, expecting "geohash" or "quad".
protected abstract SpatialPrefixTree	newSPT()

Methods inherited from class java.lang.Object

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

Field Detail

PREFIX_TREE

public static final String PREFIX_TREE

See Also:

Constant Field Values

MAX_LEVELS

public static final String MAX_LEVELS

See Also:

Constant Field Values

MAX_DIST_ERR

public static final String MAX_DIST_ERR

See Also:

Constant Field Values

args

protected Map<String,String> args

ctx

protected com.spatial4j.core.context.SpatialContext ctx

maxLevels

protected Integer maxLevels

Constructor Detail

SpatialPrefixTreeFactory

public SpatialPrefixTreeFactory()

Method Detail

makeSPT

public static SpatialPrefixTree makeSPT(Map<String,String> args,
                                        ClassLoader classLoader,
                                        com.spatial4j.core.context.SpatialContext ctx)

The factory is looked up via "prefixTree" in args, expecting "geohash" or "quad". If its neither of these, then "geohash" is chosen for a geo context, otherwise "quad" is chosen.

init

protected void init(Map<String,String> args,
                    com.spatial4j.core.context.SpatialContext ctx)

initMaxLevels

protected void initMaxLevels()

getLevelForDistance

protected abstract int getLevelForDistance(double degrees)

Calls SpatialPrefixTree.getLevelForDistance(double).

newSPT

protected abstract SpatialPrefixTree newSPT()