visad.data.units
Class UnitParser

java.lang.Object
  visad.data.units.UnitParser

All Implemented Interfaces:

UnitParserConstants

Direct Known Subclasses:

UnitParser

public class UnitParser
extends Object
implements UnitParserConstants

A class for parsing string unit specifications. Instances are thread-compatible but not thread-safe.

Field Summary

Token	jj_nt Next token.
protected static long	julianDayOrigin The Julian day number of the (artificial) time origin.
protected static Unit	SECOND The canonical time unit.
Token	token Current token.
UnitParserTokenManager	token_source Generated Token Manager.
protected static UnitsDB	unitsDB The units database.

Fields inherited from interface visad.data.units.UnitParserConstants

COLON, DEFAULT, DIVIDE, EOF, LB, LETTER, LG, LN, LPAREN, MINUS, NAME, PERIOD, PLUS, RAISE, REAL_EXP, RPAREN, SHIFT, SIGN, SP, STAR, SYMBOL, T, tokenImage, UINT, UTC

Constructor Summary

UnitParser(InputStream stream)
Constructor with InputStream.

UnitParser(InputStream stream, String encoding)
Constructor with InputStream and supplied encoding

UnitParser(Reader stream)
Constructor.

UnitParser(UnitParserTokenManager tm)
Constructor with generated Token Manager.

Method Summary

Unit	basicExpr()
Calendar	clockExpr(Calendar calendar)
Calendar	dateExpr()
void	disable_tracing() Disable tracing.
void	enable_tracing() Enable tracing.
static double	encodeTimestamp(int year, int month, int day, int hour, int minute, float second, int zone) Encode a timestamp as a double value in units of seconds.
ParseException	generateParseException() Generate ParseException.
Token	getNextToken() Get the next Token.
Token	getToken(int index) Get the specific Token.
int	integer()
static long	julianDay(int year, int month, int day) Compute the Julian day number of a date.
Unit	logExpr()
static void	main(String[] args) Test this class.
double	number()
Unit	parse(String spec) Parses a string unit specification.
Unit	powerExpr()
Unit	productExpr()
double	real()
void	ReInit(InputStream stream) Reinitialise.
void	ReInit(InputStream stream, String encoding) Reinitialise.
void	ReInit(Reader stream) Reinitialise.
void	ReInit(UnitParserTokenManager tm) Reinitialise.
Unit	shiftExpr()
int	sign()
double	tenFactor()
double	timeOriginExpr()
Unit	unitIdentifier()
Unit	unitSpec()
double	unsignedDecimal()
int	unsignedInteger()
Calendar	zoneExpr(Calendar calendar)

Methods inherited from class java.lang.Object

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

Field Detail

unitsDB

protected static UnitsDB unitsDB

The units database.

SECOND

protected static final Unit SECOND

The canonical time unit.

julianDayOrigin

protected static final long julianDayOrigin

The Julian day number of the (artificial) time origin.

token_source

public UnitParserTokenManager token_source

Generated Token Manager.

token

public Token token

Current token.

jj_nt

public Token jj_nt

Next token.

Constructor Detail

UnitParser

public UnitParser(InputStream stream)

Constructor with InputStream.

UnitParser

public UnitParser(InputStream stream,
                  String encoding)

Constructor with InputStream and supplied encoding

UnitParser

public UnitParser(Reader stream)

Constructor.

UnitParser

public UnitParser(UnitParserTokenManager tm)

Constructor with generated Token Manager.

Method Detail

julianDay

public static long julianDay(int year,
                             int month,
                             int day)

Compute the Julian day number of a date.

encodeTimestamp

public static double encodeTimestamp(int year,
                                     int month,
                                     int day,
                                     int hour,
                                     int minute,
                                     float second,
                                     int zone)

Encode a timestamp as a double value in units of seconds.

parse

public Unit parse(String spec)
           throws ParseException,
                  UnitException

Parses a string unit specification.

Parameters:

spec - The unit specification.

Returns:

A Unit corresponding to spec.

Throws:

NullPointerException - if spec is null.

ParseException - if a parsing error occurred.

UnitException - if the string specifies an invalid unit operation.

main

public static void main(String[] args)
                 throws Exception

Test this class.

Throws:

Exception

unitSpec

public final Unit unitSpec()
                    throws ParseException,
                           UnitException

Throws:

ParseException

UnitException

shiftExpr

public final Unit shiftExpr()
                     throws ParseException,
                            UnitException

Throws:

ParseException

UnitException

productExpr

public final Unit productExpr()
                       throws ParseException,
                              UnitException

Throws:

ParseException

UnitException

powerExpr

public final Unit powerExpr()
                     throws ParseException,
                            UnitException

Throws:

ParseException

UnitException

basicExpr

public final Unit basicExpr()
                     throws ParseException,
                            UnitException

Throws:

ParseException

UnitException

unitIdentifier

public final Unit unitIdentifier()
                          throws ParseException

Throws:

ParseException

logExpr

public final Unit logExpr()
                   throws ParseException,
                          UnitException

Throws:

ParseException

UnitException

number

public final double number()
                    throws ParseException

Throws:

ParseException

real

public final double real()
                  throws ParseException

Throws:

ParseException

sign

public final int sign()
               throws ParseException

Throws:

ParseException

unsignedDecimal

public final double unsignedDecimal()
                             throws ParseException

Throws:

ParseException

tenFactor

public final double tenFactor()
                       throws ParseException

Throws:

ParseException

integer

public final int integer()
                  throws ParseException

Throws:

ParseException

unsignedInteger

public final int unsignedInteger()
                          throws ParseException

Throws:

ParseException

timeOriginExpr

public final double timeOriginExpr()
                            throws ParseException

Throws:

ParseException

dateExpr

public final Calendar dateExpr()
                        throws ParseException

Throws:

ParseException

clockExpr

public final Calendar clockExpr(Calendar calendar)
                         throws ParseException

Throws:

ParseException

zoneExpr

public final Calendar zoneExpr(Calendar calendar)
                        throws ParseException

Throws:

ParseException

ReInit

public void ReInit(InputStream stream)

Reinitialise.

ReInit

public void ReInit(InputStream stream,
                   String encoding)

Reinitialise.

ReInit

public void ReInit(Reader stream)

Reinitialise.

ReInit

public void ReInit(UnitParserTokenManager tm)

Reinitialise.

getNextToken

public final Token getNextToken()

Get the next Token.

getToken

public final Token getToken(int index)

Get the specific Token.

generateParseException

public ParseException generateParseException()

Generate ParseException.

enable_tracing

public final void enable_tracing()

Enable tracing.

disable_tracing

public final void disable_tracing()

Disable tracing.