org.apache.lucene.spatial.query

Class SpatialArgsParser

java.lang.Object

org.apache.lucene.spatial.query.SpatialArgsParser

public class SpatialArgsParser
extends Object

Parses a string that usually looks like "OPERATION(SHAPE)" into a SpatialArgs object. The set of operations supported are defined in SpatialOperation, such as "Intersects" being a common one. The shape portion is defined by WKT WktShapeParser, but it can be overridden/customized via parseShape(String, com.spatial4j.core.context.SpatialContext). There are some optional name-value pair parameters that follow the closing parenthesis. Example:

   Intersects(ENVELOPE(-10,-8,22,20)) distErrPct=0.025
 

In the future it would be good to support something at least semi-standardized like a variant of [E]CQL.

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

Field Summary

Fields

Modifier and Type	Field and Description
static String	DIST_ERR
static String	DIST_ERR_PCT

Constructor Summary

Constructors

Constructor and Description
SpatialArgsParser()

Method Summary

Methods

Modifier and Type	Method and Description
protected SpatialArgs	newSpatialArgs(SpatialOperation op, com.spatial4j.core.shape.Shape shape)
SpatialArgs	parse(String v, com.spatial4j.core.context.SpatialContext ctx) Parses a string such as "Intersects(ENVELOPE(-10,-8,22,20)) distErrPct=0.025".
protected static Map<String,String>	parseMap(String body) Parses "a=b c=d f" (whitespace separated) into name-value pairs.
protected com.spatial4j.core.shape.Shape	parseShape(String str, com.spatial4j.core.context.SpatialContext ctx)
protected static boolean	readBool(String v, boolean defaultValue)
protected static Double	readDouble(String v)
protected void	readNameValuePairs(SpatialArgs args, Map<String,String> nameValPairs)

Methods inherited from class java.lang.Object

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

Field Detail

DIST_ERR_PCT

public static final String DIST_ERR_PCT

See Also:

Constant Field Values

DIST_ERR

public static final String DIST_ERR

See Also:

Constant Field Values

Constructor Detail

SpatialArgsParser

public SpatialArgsParser()

Method Detail

parse

public SpatialArgs parse(String v,
                com.spatial4j.core.context.SpatialContext ctx)
                  throws ParseException,
                         com.spatial4j.core.exception.InvalidShapeException

Parses a string such as "Intersects(ENVELOPE(-10,-8,22,20)) distErrPct=0.025".

Parameters:

v - The string to parse. Mandatory.

ctx - The spatial context. Mandatory.

Returns:

Not null.

Throws:

IllegalArgumentException - if the parameters don't make sense or an add-on parameter is unknown

ParseException - If there is a problem parsing the string

com.spatial4j.core.exception.InvalidShapeException - When the coordinates are invalid for the shape

newSpatialArgs

protected SpatialArgs newSpatialArgs(SpatialOperation op,
                         com.spatial4j.core.shape.Shape shape)

readNameValuePairs

protected void readNameValuePairs(SpatialArgs args,
                      Map<String,String> nameValPairs)

parseShape

protected com.spatial4j.core.shape.Shape parseShape(String str,
                                        com.spatial4j.core.context.SpatialContext ctx)
                                             throws ParseException

Throws:

ParseException

readDouble

protected static Double readDouble(String v)

readBool

protected static boolean readBool(String v,
               boolean defaultValue)

parseMap

protected static Map<String,String> parseMap(String body)

Parses "a=b c=d f" (whitespace separated) into name-value pairs. If there is no '=' as in 'f' above then it's short for f=f.