org.h2.util.ToDateTokenizer Maven / Gradle / Ivy
/*
* Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (http://h2database.com/html/license.html).
* Initial Developer: Daniel Gredler
*/
package org.h2.util;
import static java.lang.String.format;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.h2.api.ErrorCode;
import org.h2.message.DbException;
/**
* Emulates Oracle's TO_DATE function. This class knows all about the
* TO_DATE-format conventions and how to parse the corresponding data.
*/
class ToDateTokenizer {
/**
* The pattern for a number.
*/
static final Pattern PATTERN_NUMBER = Pattern.compile("^([+-]?[0-9]+)");
/**
* The pattern for four digits (typically a year).
*/
static final Pattern PATTERN_FOUR_DIGITS = Pattern.compile("^([+-]?[0-9]{4})");
/**
* The pattern 2-4 digits (e.g. for RRRR).
*/
static final Pattern PATTERN_TWO_TO_FOUR_DIGITS = Pattern.compile("^([+-]?[0-9]{2,4})");
/**
* The pattern for three digits.
*/
static final Pattern PATTERN_THREE_DIGITS = Pattern.compile("^([+-]?[0-9]{3})");
/**
* The pattern for two digits.
*/
static final Pattern PATTERN_TWO_DIGITS = Pattern.compile("^([+-]?[0-9]{2})");
/**
* The pattern for one or two digits.
*/
static final Pattern PATTERN_TWO_DIGITS_OR_LESS =
Pattern.compile("^([+-]?[0-9][0-9]?)");
/**
* The pattern for one digit.
*/
static final Pattern PATTERN_ONE_DIGIT =
Pattern.compile("^([+-]?[0-9])");
/**
* The pattern for a fraction (of a second for example).
*/
static final Pattern PATTERN_FF =
Pattern.compile("^(FF[0-9]?)", Pattern.CASE_INSENSITIVE);
/**
* The pattern for "am" or "pm".
*/
static final Pattern PATTERN_AM_PM =
Pattern.compile("^(AM|A\\.M\\.|PM|P\\.M\\.)", Pattern.CASE_INSENSITIVE);
/**
* The pattern for "bc" or "ad".
*/
static final Pattern PATTERN_BC_AD =
Pattern.compile("^(BC|B\\.C\\.|AD|A\\.D\\.)", Pattern.CASE_INSENSITIVE);
/**
* The parslet for a year.
*/
static final YearParslet PARSLET_YEAR = new YearParslet();
/**
* The parslet for a month.
*/
static final MonthParslet PARSLET_MONTH = new MonthParslet();
/**
* The parslet for a day.
*/
static final DayParslet PARSLET_DAY = new DayParslet();
/**
* The parslet for time.
*/
static final TimeParslet PARSLET_TIME = new TimeParslet();
/**
* The number of milliseconds in a day.
*/
static final int MILLIS_IN_HOUR = 60 * 60 * 1000;
/**
* Interface of the classes that can parse a specialized small bit of the
* TO_DATE format-string.
*/
interface ToDateParslet {
/**
* Parse a date part.
*
* @param params the parameters that contains the string
* @param formatTokenEnum the format
* @param formatTokenStr the format string
*/
void parse(ToDateParser params, FormatTokenEnum formatTokenEnum,
String formatTokenStr);
}
/**
* Parslet responsible for parsing year parameter
*/
static class YearParslet implements ToDateParslet {
@Override
public void parse(ToDateParser params, FormatTokenEnum formatTokenEnum,
String formatTokenStr) {
Calendar result = params.getResultCalendar();
String inputFragmentStr = null;
int dateNr = 0;
switch (formatTokenEnum) {
case SYYYY:
case YYYY:
case IYYY:
inputFragmentStr = matchStringOrThrow(
PATTERN_FOUR_DIGITS, params, formatTokenEnum);
// only necessary for Java1.6
if (inputFragmentStr.startsWith("+")) {
inputFragmentStr = inputFragmentStr.substring(1);
}
dateNr = Integer.parseInt(inputFragmentStr);
// Gregorian calendar does not have a year 0.
// 0 = 0001 BC, -1 = 0002 BC, ... so we adjust
if (dateNr == 0) {
throwException(params, "Year may not be zero");
}
result.set(Calendar.YEAR, dateNr >= 0 ? dateNr : dateNr + 1);
break;
case YYY:
case IYY:
inputFragmentStr = matchStringOrThrow(
PATTERN_THREE_DIGITS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
// Gregorian calendar does not have a year 0.
// 0 = 0001 BC, -1 = 0002 BC, ... so we adjust
result.set(Calendar.YEAR, dateNr >= 0 ? dateNr : dateNr + 1);
break;
case RRRR:
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_TO_FOUR_DIGITS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
if (inputFragmentStr.length() < 4) {
if (dateNr < 50) {
dateNr += 2000;
} else if (dateNr < 100) {
dateNr += 1900;
}
}
if (dateNr == 0) {
throwException(params, "Year may not be zero");
}
result.set(Calendar.YEAR, dateNr);
break;
case RR:
Calendar calendar = Calendar.getInstance();
int cc = calendar.get(Calendar.YEAR) / 100;
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_DIGITS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr) + cc * 100;
result.set(Calendar.YEAR, dateNr);
break;
case EE /*NOT supported yet*/:
throwException(params, format(
"token '%s' not supported yet.", formatTokenEnum.name()));
break;
case E /*NOT supported yet*/:
throwException(params, format(
"token '%s' not supported yet.", formatTokenEnum.name()));
break;
case YY:
case IY:
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_DIGITS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
// Gregorian calendar does not have a year 0.
// 0 = 0001 BC, -1 = 0002 BC, ... so we adjust
result.set(Calendar.YEAR, dateNr >= 0 ? dateNr : dateNr + 1);
break;
case SCC:
case CC:
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_DIGITS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr) * 100;
result.set(Calendar.YEAR, dateNr);
break;
case Y:
case I:
inputFragmentStr = matchStringOrThrow(
PATTERN_ONE_DIGIT, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
// Gregorian calendar does not have a year 0.
// 0 = 0001 BC, -1 = 0002 BC, ... so we adjust
result.set(Calendar.YEAR, dateNr >= 0 ? dateNr : dateNr + 1);
break;
case BC_AD:
inputFragmentStr = matchStringOrThrow(
PATTERN_BC_AD, params, formatTokenEnum);
if (inputFragmentStr.toUpperCase().startsWith("B")) {
result.set(Calendar.ERA, GregorianCalendar.BC);
} else {
result.set(Calendar.ERA, GregorianCalendar.AD);
}
break;
default:
throw new IllegalArgumentException(format(
"%s: Internal Error. Unhandled case: %s", this.getClass()
.getSimpleName(), formatTokenEnum));
}
params.remove(inputFragmentStr, formatTokenStr);
}
}
/**
* Parslet responsible for parsing month parameter
*/
static class MonthParslet implements ToDateParslet {
private static final String[] ROMAN_MONTH = { "I", "II", "III", "IV",
"V", "VI", "VII", "VIII", "IX", "X", "XI", "XII" };
@Override
public void parse(ToDateParser params, FormatTokenEnum formatTokenEnum,
String formatTokenStr) {
Calendar result = params.getResultCalendar();
String s = params.getInputStr();
String inputFragmentStr = null;
int dateNr = 0;
switch (formatTokenEnum) {
case MONTH:
inputFragmentStr = setByName(result, params,
Calendar.MONTH, Calendar.LONG);
break;
case Q /*NOT supported yet*/:
throwException(params, format(
"token '%s' not supported yet.", formatTokenEnum.name()));
break;
case MON:
inputFragmentStr = setByName(result, params,
Calendar.MONTH, Calendar.SHORT);
break;
case MM:
// Note: In Calendar Month go from 0 - 11
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_DIGITS_OR_LESS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
result.set(Calendar.MONTH, dateNr - 1);
break;
case RM:
dateNr = 0;
for (String monthName : ROMAN_MONTH) {
dateNr++;
int len = monthName.length();
if (s.length() >= len &&
monthName.equalsIgnoreCase(s.substring(0, len))) {
result.set(Calendar.MONTH, dateNr);
inputFragmentStr = monthName;
break;
}
}
if (inputFragmentStr == null || inputFragmentStr.isEmpty()) {
throwException(params,
format("Issue happened when parsing token '%s'. " +
"Expected one of: %s",
formatTokenEnum.name(), Arrays.toString(ROMAN_MONTH)));
}
break;
default:
throw new IllegalArgumentException(format(
"%s: Internal Error. Unhandled case: %s", this.getClass()
.getSimpleName(), formatTokenEnum));
}
params.remove(inputFragmentStr, formatTokenStr);
}
}
/**
* Parslet responsible for parsing day parameter
*/
static class DayParslet implements ToDateParslet {
@Override
public void parse(ToDateParser params, FormatTokenEnum formatTokenEnum,
String formatTokenStr) {
Calendar result = params.getResultCalendar();
String inputFragmentStr = null;
int dateNr = 0;
switch (formatTokenEnum) {
case DDD:
inputFragmentStr = matchStringOrThrow(
PATTERN_NUMBER, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
result.set(Calendar.DAY_OF_YEAR, dateNr);
break;
case DD:
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_DIGITS_OR_LESS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
result.set(Calendar.DAY_OF_MONTH, dateNr);
break;
case D:
inputFragmentStr = matchStringOrThrow(
PATTERN_ONE_DIGIT, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
result.set(Calendar.DAY_OF_MONTH, dateNr);
break;
case DAY:
inputFragmentStr = setByName(result, params,
Calendar.DAY_OF_WEEK, Calendar.LONG);
break;
case DY:
inputFragmentStr = setByName(result, params,
Calendar.DAY_OF_WEEK, Calendar.SHORT);
break;
case J:
inputFragmentStr = matchStringOrThrow(
PATTERN_NUMBER, params, formatTokenEnum);
try {
Date date = new SimpleDateFormat("Myydd").parse(inputFragmentStr);
result.setTime(date);
} catch (ParseException e) {
throwException(params, format(
"Failed to parse Julian date: %s", inputFragmentStr));
}
break;
default:
throw new IllegalArgumentException(format(
"%s: Internal Error. Unhandled case: %s", this.getClass()
.getSimpleName(), formatTokenEnum));
}
params.remove(inputFragmentStr, formatTokenStr);
}
}
/**
* Parslet responsible for parsing time parameter
*/
static class TimeParslet implements ToDateParslet {
@Override
public void parse(ToDateParser params, FormatTokenEnum formatTokenEnum,
String formatTokenStr) {
Calendar result = params.getResultCalendar();
String inputFragmentStr = null;
int dateNr = 0;
switch (formatTokenEnum) {
case HH24:
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_DIGITS_OR_LESS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
result.set(Calendar.HOUR_OF_DAY, dateNr);
break;
case HH12:
case HH:
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_DIGITS_OR_LESS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
result.set(Calendar.HOUR, dateNr);
break;
case MI:
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_DIGITS_OR_LESS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
result.set(Calendar.MINUTE, dateNr);
break;
case SS:
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_DIGITS_OR_LESS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
result.set(Calendar.SECOND, dateNr);
break;
case SSSSS:
inputFragmentStr = matchStringOrThrow(
PATTERN_NUMBER, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
result.set(Calendar.HOUR_OF_DAY, 0);
result.set(Calendar.MINUTE, 0);
result.set(Calendar.SECOND, dateNr);
break;
case FF:
inputFragmentStr = matchStringOrThrow(
PATTERN_NUMBER, params, formatTokenEnum);
String paddedRightNrStr = format("%-9s", inputFragmentStr).replace(' ', '0');
paddedRightNrStr = paddedRightNrStr.substring(0, 9);
Double nineDigits = Double.parseDouble(paddedRightNrStr);
params.setNanos(nineDigits.intValue());
dateNr = (int) Math.round(nineDigits / 1000000.0);
result.set(Calendar.MILLISECOND, dateNr);
break;
case AM_PM:
inputFragmentStr = matchStringOrThrow(
PATTERN_AM_PM, params, formatTokenEnum);
if (inputFragmentStr.toUpperCase().startsWith("A")) {
result.set(Calendar.AM_PM, Calendar.AM);
} else {
result.set(Calendar.AM_PM, Calendar.PM);
}
break;
case TZH:
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_DIGITS_OR_LESS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
TimeZone tz = result.getTimeZone();
int offsetMillis = tz.getRawOffset();
// purge min and sec
offsetMillis = (offsetMillis / MILLIS_IN_HOUR) * MILLIS_IN_HOUR;
tz.setRawOffset(offsetMillis + dateNr);
result.setTimeZone(tz);
break;
case TZM:
inputFragmentStr = matchStringOrThrow(
PATTERN_TWO_DIGITS_OR_LESS, params, formatTokenEnum);
dateNr = Integer.parseInt(inputFragmentStr);
tz = result.getTimeZone();
offsetMillis = tz.getRawOffset();
// purge hour
offsetMillis = offsetMillis % MILLIS_IN_HOUR;
tz.setRawOffset(dateNr * MILLIS_IN_HOUR + offsetMillis);
result.setTimeZone(tz);
break;
case TZR:
// Example: US/Pacific
String s = params.getInputStr();
tz = result.getTimeZone();
for (String tzName : TimeZone.getAvailableIDs()) {
int length = tzName.length();
if (s.length() >= length &&
tzName.equalsIgnoreCase(s.substring(0, length))) {
tz.setID(tzName);
result.setTimeZone(tz);
inputFragmentStr = tzName;
break;
}
}
break;
case TZD:
// Must correspond with TZR region. Example: PST (for US/Pacific
// standard time)
throwException(params, format("token '%s' not supported yet.",
formatTokenEnum.name()));
break;
default:
throw new IllegalArgumentException(format(
"%s: Internal Error. Unhandled case: %s", this.getClass()
.getSimpleName(), formatTokenEnum));
}
params.remove(inputFragmentStr, formatTokenStr);
}
}
/**
* Match the pattern, or if not possible throw an exception.
*
* @param p the pattern
* @param params the parameters with the input string
* @param aEnum the pattern name
* @return the matched value
*/
static String matchStringOrThrow(Pattern p, ToDateParser params, Enum aEnum) {
String s = params.getInputStr();
Matcher matcher = p.matcher(s);
if (!matcher.find()) {
throwException(params, format("Issue happened when parsing token '%s'", aEnum.name()));
}
return matcher.group(1);
}
/**
* Set the given field in the calendar.
*
* @param c the calendar
* @param params the parameters with the input string
* @param field the field to set
* @param style the data type
* @return the matched value
*/
static String setByName(Calendar c, ToDateParser params, int field, int style) {
String inputFragmentStr = null;
String s = params.getInputStr();
Map timeStringMap = c.getDisplayNames(
field, style, Locale.getDefault());
for (String dayName : timeStringMap.keySet()) {
int len = dayName.length();
if (dayName.equalsIgnoreCase(s.substring(0, len))) {
c.set(field, timeStringMap.get(dayName));
inputFragmentStr = dayName;
break;
}
}
if (inputFragmentStr == null || inputFragmentStr.isEmpty()) {
throwException(params, format(
"Tried to parse one of '%s' but failed (may be an internal error?)",
timeStringMap.keySet()));
}
return inputFragmentStr;
}
/**
* Throw a parse exception.
*
* @param params the parameters with the input string
* @param errorStr the error string
*/
static void throwException(ToDateParser params, String errorStr) {
throw DbException.get(
ErrorCode.INVALID_TO_DATE_FORMAT,
params.getFunctionName(),
format(" %s. Details: %s", errorStr, params));
}
/**
* The format tokens.
*/
public static enum FormatTokenEnum {
// 4-digit year
YYYY(PARSLET_YEAR),
// 4-digit year with sign (- = B.C.)
SYYYY(PARSLET_YEAR),
// 4-digit year based on the ISO standard (?)
IYYY(PARSLET_YEAR),
YYY(PARSLET_YEAR),
IYY(PARSLET_YEAR),
YY(PARSLET_YEAR),
IY(PARSLET_YEAR),
// Two-digit century with with sign (- = B.C.)
SCC(PARSLET_YEAR),
// Two-digit century.
CC(PARSLET_YEAR),
// 2-digit -> 4-digit year 0-49 -> 20xx , 50-99 -> 19xx
RRRR(PARSLET_YEAR),
// last 2-digit of the year using "current" century value.
RR(PARSLET_YEAR),
// Meridian indicator
BC_AD(PARSLET_YEAR, PATTERN_BC_AD),
// Full Name of month
MONTH(PARSLET_MONTH),
// Abbreviated name of month.
MON(PARSLET_MONTH),
// Month (01-12; JAN = 01).
MM(PARSLET_MONTH),
// Roman numeral month (I-XII; JAN = I).
RM(PARSLET_MONTH),
// Day of year (1-366).
DDD(PARSLET_DAY),
// Name of day.
DAY(PARSLET_DAY),
// Day of month (1-31).
DD(PARSLET_DAY),
// Abbreviated name of day.
DY(PARSLET_DAY),
HH24(PARSLET_TIME),
HH12(PARSLET_TIME),
// Hour of day (1-12).
HH(PARSLET_TIME),
// Min
MI(PARSLET_TIME),
// Seconds past midnight (0-86399)
SSSSS(PARSLET_TIME),
SS(PARSLET_TIME),
// Fractional seconds
FF(PARSLET_TIME, PATTERN_FF),
// Time zone hour.
TZH(PARSLET_TIME),
// Time zone minute.
TZM(PARSLET_TIME),
// Time zone region ID
TZR(PARSLET_TIME),
// Daylight savings information. Example:
// PST (for US/Pacific standard time);
TZD(PARSLET_TIME),
// Meridian indicator
AM_PM(PARSLET_TIME, PATTERN_AM_PM),
// NOT supported yet -
// Full era name (Japanese Imperial, ROC Official,
// and Thai Buddha calendars).
EE(PARSLET_YEAR),
// NOT supported yet -
// Abbreviated era name (Japanese Imperial,
// ROC Official, and Thai Buddha calendars).
E(PARSLET_YEAR),
Y(PARSLET_YEAR),
I(PARSLET_YEAR),
// Quarter of year (1, 2, 3, 4; JAN-MAR = 1).
Q(PARSLET_MONTH),
// Day of week (1-7).
D(PARSLET_DAY),
// NOT supported yet -
// Julian day; the number of days since Jan 1, 4712 BC.
J(PARSLET_DAY);
private static final List EMPTY_LIST =
new ArrayList(0);
private static final Map> CACHE =
new HashMap>(FormatTokenEnum.values().length);
private final ToDateParslet toDateParslet;
private final Pattern patternToUse;
/**
* Construct a format token.
*
* @param toDateParslet the date parslet
* @param patternToUse the pattern
*/
FormatTokenEnum(ToDateParslet toDateParslet, Pattern patternToUse) {
this.toDateParslet = toDateParslet;
this.patternToUse = patternToUse;
}
/**
* Construct a format token.
*
* @param toDateParslet the date parslet
*/
FormatTokenEnum(ToDateParslet toDateParslet) {
this.toDateParslet = toDateParslet;
patternToUse = Pattern.compile(format("^(%s)", name()), Pattern.CASE_INSENSITIVE);
}
/**
* Optimization: Only return a list of {@link FormatTokenEnum} that
* share the same 1st char using the 1st char of the 'to parse'
* formatStr. Or return empty list if no match.
*
* @param formatStr the format string
* @return the list of tokens
*/
static List getTokensInQuestion(String formatStr) {
List result = EMPTY_LIST;
if (CACHE.size() <= 0) {
initCache();
}
if (formatStr != null && formatStr.length() > 0) {
Character key = Character.toUpperCase(formatStr.charAt(0));
result = CACHE.get(key);
}
if (result == null) {
result = EMPTY_LIST;
}
return result;
}
private static synchronized void initCache() {
if (CACHE.size() <= 0) {
for (FormatTokenEnum token : FormatTokenEnum.values()) {
List tokenKeys = new ArrayList();
if (token.name().contains("_")) {
String[] tokens = token.name().split("_");
for (String tokenLets : tokens) {
tokenKeys.add(tokenLets.toUpperCase().charAt(0));
}
} else {
tokenKeys.add(token.name().toUpperCase().charAt(0));
}
for (Character tokenKey : tokenKeys) {
List l = CACHE.get(tokenKey);
if (l == null) {
l = new ArrayList(1);
CACHE.put(tokenKey, l);
}
l.add(token);
}
}
}
}
/**
* Parse the format-string with passed token of {@link FormatTokenEnum}.
* If token matches return true, otherwise false.
*
* @param params the parameters
* @return true if it matches
*/
boolean parseFormatStrWithToken(ToDateParser params) {
Matcher matcher = patternToUse.matcher(params.getFormatStr());
boolean foundToken = matcher.find();
if (foundToken) {
String formatTokenStr = matcher.group(1);
toDateParslet.parse(params, this, formatTokenStr);
}
return foundToken;
}
}
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