com.spatial4j.core.io

Class WKTReader.State

java.lang.Object

com.spatial4j.core.io.WKTReader.State

Enclosing class:

WKTReader

public class WKTReader.State
extends Object

The parse state.

Field Summary

Fields

Modifier and Type	Field and Description
String	dimension Dimensionality specifier (e.g.
int	offset Offset of the next char in rawString to be read.
String	rawString Set in WKTReader.parseIfSupported(String).

Constructor Summary

Constructors

Constructor and Description
WKTReader.State(String rawString)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	eof() If the string is consumed, i.e.
SpatialContext	getCtx()
WKTReader	getParser()
double	nextDouble() Reads in a double from the String.
void	nextExpect(char expected) Verifies that the current character is of the expected value.
boolean	nextIf(char expected) If the current character is expected, then offset is advanced after it and any subsequent whitespace.
boolean	nextIfEmptyAndSkipZM() Skips over a dimensionality token (e.g.
void	nextIfWhitespace() Moves offset to next non-whitespace character.
String	nextSubShapeString() Returns the next chunk of text till the next ',' or ')' (non-inclusive) or EOF.
String	nextWord() Reads the word starting at the current character position.
void	skipDouble() Advances offset forward until it points to a character that isn't part of a number.
void	skipNextDoubles() Advances past as many doubles as there are, with intervening whitespace.

Methods inherited from class java.lang.Object

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

Field Detail

rawString

public String rawString

Set in WKTReader.parseIfSupported(String).

offset

public int offset

Offset of the next char in rawString to be read.

dimension

public String dimension

Dimensionality specifier (e.g. 'Z', or 'M') following a shape type name.

Constructor Detail

WKTReader.State

public WKTReader.State(String rawString)

Method Detail

getCtx

public SpatialContext getCtx()

getParser

public WKTReader getParser()

nextWord

public String nextWord()
                throws ParseException

Reads the word starting at the current character position. The word terminates once Character.isJavaIdentifierPart(char) returns false (or EOF). offset is advanced past whitespace.

Returns:

Non-null non-empty String.

Throws:

ParseException

nextIfEmptyAndSkipZM

public boolean nextIfEmptyAndSkipZM()
                             throws ParseException

Skips over a dimensionality token (e.g. 'Z' or 'M') if found, storing in dimension, and then looks for EMPTY, consuming that and whitespace.

   dimensionToken? 'EMPTY'?
 

Returns:

True if EMPTY was found.

Throws:

ParseException

nextDouble

public double nextDouble()
                  throws ParseException

Reads in a double from the String. Parses digits with an optional decimal, sign, or exponent. NaN and Infinity are not supported. offset is advanced past whitespace.

Returns:

Double value

Throws:

ParseException

skipDouble

public void skipDouble()

Advances offset forward until it points to a character that isn't part of a number.

skipNextDoubles

public void skipNextDoubles()

Advances past as many doubles as there are, with intervening whitespace.

nextExpect

public void nextExpect(char expected)
                throws ParseException

Verifies that the current character is of the expected value. If the character is the expected value, then it is consumed and offset is advanced past whitespace.

Parameters:

expected - The expected char.

Throws:

ParseException

eof

public final boolean eof()

If the string is consumed, i.e. at end-of-file.

nextIf

public boolean nextIf(char expected)

If the current character is expected, then offset is advanced after it and any subsequent whitespace. Otherwise, false is returned.

Parameters:

expected - The expected char

Returns:

true if consumed

nextIfWhitespace

public void nextIfWhitespace()

Moves offset to next non-whitespace character. Doesn't move if the offset is already at non-whitespace. There is very little reason for subclasses to call this because most other parsing methods call it.

nextSubShapeString

public String nextSubShapeString()
                          throws ParseException

Returns the next chunk of text till the next ',' or ')' (non-inclusive) or EOF. If a '(' is encountered, then it looks past its matching ')', taking care to handle nested matching parenthesis too. It's designed to be of use to subclasses that wish to get the entire subshape at the current position as a string so that it might be passed to other software that will parse it.

Example:

 OUTER(INNER(3, 5))
 

If this is called when offset is at the first character, then it will return this whole string. If called at the "I" then it will return "INNER(3, 5)". If called at "3", then it will return "3". In all cases, offset will be positioned at the next position following the returned substring.

Returns:

non-null substring.

Throws:

ParseException