package cn.emay.sdk.util.json.gson.internal.bind.util;
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import java.text.ParseException;
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import java.text.ParsePosition;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.GregorianCalendar;
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import java.util.Locale;
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import java.util.TimeZone;
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/**
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* Utilities methods for manipulating dates in iso8601 format. This is much much
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* faster and GC friendly than using SimpleDateFormat so highly suitable if you
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* (un)serialize lots of date objects.
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*
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* Supported parse format:
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* [yyyy-MM-dd|yyyyMMdd][T(hh:mm[:ss[.sss]]|hhmm[ss[.sss]])]?[Z|[+-]hh[:]mm]]
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*
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* @see <a href="http://www.w3.org/TR/NOTE-datetime">this specification</a>
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*/
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// Date parsing code from Jackson databind ISO8601Utils.java
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// https://github.com/FasterXML/jackson-databind/blob/master/src/main/java/com/fasterxml/jackson/databind/util/ISO8601Utils.java
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public class ISO8601Utils {
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/**
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* ID to represent the 'UTC' string, default timezone since Jackson 2.7
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*
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* @since 2.7
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*/
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private static final String UTC_ID = "UTC";
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/**
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* The UTC timezone, prefetched to avoid more lookups.
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*
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* @since 2.7
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*/
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private static final TimeZone TIMEZONE_UTC = TimeZone.getTimeZone(UTC_ID);
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/*
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* /********************************************************** /* Formatting
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* /**********************************************************
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*/
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/**
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* Format a date into 'yyyy-MM-ddThh:mm:ssZ' (default timezone, no milliseconds
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* precision)
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*
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* @param date
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* the date to format
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* @return the date formatted as 'yyyy-MM-ddThh:mm:ssZ'
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*/
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public static String format(Date date) {
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return format(date, false, TIMEZONE_UTC);
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}
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/**
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* Format a date into 'yyyy-MM-ddThh:mm:ss[.sss]Z' (GMT timezone)
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*
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* @param date
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* the date to format
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* @param millis
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* true to include millis precision otherwise false
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* @return the date formatted as 'yyyy-MM-ddThh:mm:ss[.sss]Z'
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*/
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public static String format(Date date, boolean millis) {
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return format(date, millis, TIMEZONE_UTC);
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}
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/**
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* Format date into yyyy-MM-ddThh:mm:ss[.sss][Z|[+-]hh:mm]
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*
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* @param date
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* the date to format
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* @param millis
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* true to include millis precision otherwise false
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* @param tz
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* timezone to use for the formatting (UTC will produce 'Z')
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* @return the date formatted as yyyy-MM-ddThh:mm:ss[.sss][Z|[+-]hh:mm]
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*/
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public static String format(Date date, boolean millis, TimeZone tz) {
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Calendar calendar = new GregorianCalendar(tz, Locale.US);
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calendar.setTime(date);
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// estimate capacity of buffer as close as we can (yeah, that's pedantic ;)
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int capacity = "yyyy-MM-ddThh:mm:ss".length();
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capacity += millis ? ".sss".length() : 0;
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capacity += tz.getRawOffset() == 0 ? "Z".length() : "+hh:mm".length();
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StringBuilder formatted = new StringBuilder(capacity);
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padInt(formatted, calendar.get(Calendar.YEAR), "yyyy".length());
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formatted.append('-');
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padInt(formatted, calendar.get(Calendar.MONTH) + 1, "MM".length());
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formatted.append('-');
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padInt(formatted, calendar.get(Calendar.DAY_OF_MONTH), "dd".length());
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formatted.append('T');
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padInt(formatted, calendar.get(Calendar.HOUR_OF_DAY), "hh".length());
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formatted.append(':');
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padInt(formatted, calendar.get(Calendar.MINUTE), "mm".length());
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formatted.append(':');
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padInt(formatted, calendar.get(Calendar.SECOND), "ss".length());
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if (millis) {
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formatted.append('.');
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padInt(formatted, calendar.get(Calendar.MILLISECOND), "sss".length());
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}
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int offset = tz.getOffset(calendar.getTimeInMillis());
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if (offset != 0) {
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int hours = Math.abs((offset / (60 * 1000)) / 60);
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int minutes = Math.abs((offset / (60 * 1000)) % 60);
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formatted.append(offset < 0 ? '-' : '+');
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padInt(formatted, hours, "hh".length());
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formatted.append(':');
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padInt(formatted, minutes, "mm".length());
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} else {
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formatted.append('Z');
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}
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return formatted.toString();
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}
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/*
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* /********************************************************** /* Parsing
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* /**********************************************************
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*/
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/**
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* Parse a date from ISO-8601 formatted string. It expects a format
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* [yyyy-MM-dd|yyyyMMdd][T(hh:mm[:ss[.sss]]|hhmm[ss[.sss]])]?[Z|[+-]hh[:mm]]]
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*
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* @param date
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* ISO string to parse in the appropriate format.
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* @param pos
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* The position to start parsing from, updated to where parsing
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* stopped.
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* @return the parsed date
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* @throws ParseException
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* if the date is not in the appropriate format
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*/
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public static Date parse(String date, ParsePosition pos) throws ParseException {
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Exception fail = null;
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try {
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int offset = pos.getIndex();
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// extract year
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int year = parseInt(date, offset, offset += 4);
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if (checkOffset(date, offset, '-')) {
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offset += 1;
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}
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// extract month
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int month = parseInt(date, offset, offset += 2);
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if (checkOffset(date, offset, '-')) {
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offset += 1;
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}
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// extract day
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int day = parseInt(date, offset, offset += 2);
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// default time value
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int hour = 0;
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int minutes = 0;
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int seconds = 0;
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int milliseconds = 0; // always use 0 otherwise returned date will include millis of current time
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// if the value has no time component (and no time zone), we are done
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boolean hasT = checkOffset(date, offset, 'T');
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if (!hasT && (date.length() <= offset)) {
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Calendar calendar = new GregorianCalendar(year, month - 1, day);
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pos.setIndex(offset);
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return calendar.getTime();
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}
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if (hasT) {
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// extract hours, minutes, seconds and milliseconds
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hour = parseInt(date, offset += 1, offset += 2);
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if (checkOffset(date, offset, ':')) {
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offset += 1;
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}
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minutes = parseInt(date, offset, offset += 2);
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if (checkOffset(date, offset, ':')) {
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offset += 1;
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}
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// second and milliseconds can be optional
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if (date.length() > offset) {
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char c = date.charAt(offset);
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if (c != 'Z' && c != '+' && c != '-') {
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seconds = parseInt(date, offset, offset += 2);
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if (seconds > 59 && seconds < 63)
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seconds = 59; // truncate up to 3 leap seconds
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// milliseconds can be optional in the format
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if (checkOffset(date, offset, '.')) {
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offset += 1;
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int endOffset = indexOfNonDigit(date, offset + 1); // assume at least one digit
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int parseEndOffset = Math.min(endOffset, offset + 3); // parse up to 3 digits
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int fraction = parseInt(date, offset, parseEndOffset);
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// compensate for "missing" digits
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switch (parseEndOffset - offset) { // number of digits parsed
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case 2:
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milliseconds = fraction * 10;
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break;
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case 1:
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milliseconds = fraction * 100;
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break;
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default:
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milliseconds = fraction;
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}
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offset = endOffset;
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}
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}
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}
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}
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// extract timezone
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if (date.length() <= offset) {
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throw new IllegalArgumentException("No time zone indicator");
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}
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TimeZone timezone = null;
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char timezoneIndicator = date.charAt(offset);
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if (timezoneIndicator == 'Z') {
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timezone = TIMEZONE_UTC;
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offset += 1;
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} else if (timezoneIndicator == '+' || timezoneIndicator == '-') {
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String timezoneOffset = date.substring(offset);
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// When timezone has no minutes, we should append it, valid timezones are, for
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// example: +00:00, +0000 and +00
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timezoneOffset = timezoneOffset.length() >= 5 ? timezoneOffset : timezoneOffset + "00";
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offset += timezoneOffset.length();
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// 18-Jun-2015, tatu: Minor simplification, skip offset of "+0000"/"+00:00"
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if ("+0000".equals(timezoneOffset) || "+00:00".equals(timezoneOffset)) {
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timezone = TIMEZONE_UTC;
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} else {
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// 18-Jun-2015, tatu: Looks like offsets only work from GMT, not UTC...
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// not sure why, but that's the way it looks. Further, Javadocs for
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// `java.util.TimeZone` specifically instruct use of GMT as base for
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// custom timezones... odd.
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String timezoneId = "GMT" + timezoneOffset;
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// String timezoneId = "UTC" + timezoneOffset;
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timezone = TimeZone.getTimeZone(timezoneId);
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String act = timezone.getID();
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if (!act.equals(timezoneId)) {
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/*
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* 22-Jan-2015, tatu: Looks like canonical version has colons, but we may be
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* given one without. If so, don't sweat. Yes, very inefficient. Hopefully not
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* hit often. If it becomes a perf problem, add 'loose' comparison instead.
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*/
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String cleaned = act.replace(":", "");
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if (!cleaned.equals(timezoneId)) {
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throw new IndexOutOfBoundsException("Mismatching time zone indicator: " + timezoneId + " given, resolves to " + timezone.getID());
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}
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}
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}
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} else {
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throw new IndexOutOfBoundsException("Invalid time zone indicator '" + timezoneIndicator + "'");
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}
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Calendar calendar = new GregorianCalendar(timezone);
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calendar.setLenient(false);
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calendar.set(Calendar.YEAR, year);
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calendar.set(Calendar.MONTH, month - 1);
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calendar.set(Calendar.DAY_OF_MONTH, day);
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calendar.set(Calendar.HOUR_OF_DAY, hour);
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calendar.set(Calendar.MINUTE, minutes);
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calendar.set(Calendar.SECOND, seconds);
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calendar.set(Calendar.MILLISECOND, milliseconds);
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pos.setIndex(offset);
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return calendar.getTime();
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// If we get a ParseException it'll already have the right message/offset.
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// Other exception types can convert here.
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} catch (IndexOutOfBoundsException e) {
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fail = e;
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} catch (NumberFormatException e) {
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fail = e;
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} catch (IllegalArgumentException e) {
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fail = e;
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}
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String input = (date == null) ? null : ('"' + date + "'");
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String msg = fail.getMessage();
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if (msg == null || msg.isEmpty()) {
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msg = "(" + fail.getClass().getName() + ")";
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}
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ParseException ex = new ParseException("Failed to parse date [" + input + "]: " + msg, pos.getIndex());
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ex.initCause(fail);
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throw ex;
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}
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/**
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* Check if the expected character exist at the given offset in the value.
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*
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* @param value
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* the string to check at the specified offset
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* @param offset
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* the offset to look for the expected character
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* @param expected
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* the expected character
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* @return true if the expected character exist at the given offset
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*/
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private static boolean checkOffset(String value, int offset, char expected) {
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return (offset < value.length()) && (value.charAt(offset) == expected);
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}
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/**
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* Parse an integer located between 2 given offsets in a string
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*
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* @param value
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* the string to parse
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* @param beginIndex
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* the start index for the integer in the string
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* @param endIndex
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* the end index for the integer in the string
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* @return the int
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* @throws NumberFormatException
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* if the value is not a number
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*/
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private static int parseInt(String value, int beginIndex, int endIndex) throws NumberFormatException {
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if (beginIndex < 0 || endIndex > value.length() || beginIndex > endIndex) {
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throw new NumberFormatException(value);
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}
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// use same logic as in Integer.parseInt() but less generic we're not supporting
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// negative values
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int i = beginIndex;
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int result = 0;
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int digit;
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if (i < endIndex) {
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digit = Character.digit(value.charAt(i++), 10);
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if (digit < 0) {
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throw new NumberFormatException("Invalid number: " + value.substring(beginIndex, endIndex));
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}
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result = -digit;
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}
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while (i < endIndex) {
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digit = Character.digit(value.charAt(i++), 10);
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if (digit < 0) {
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throw new NumberFormatException("Invalid number: " + value.substring(beginIndex, endIndex));
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}
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result *= 10;
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result -= digit;
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}
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return -result;
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}
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/**
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* Zero pad a number to a specified length
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*
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* @param buffer
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* buffer to use for padding
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* @param value
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* the integer value to pad if necessary.
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* @param length
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* the length of the string we should zero pad
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*/
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private static void padInt(StringBuilder buffer, int value, int length) {
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String strValue = Integer.toString(value);
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for (int i = length - strValue.length(); i > 0; i--) {
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buffer.append('0');
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}
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buffer.append(strValue);
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}
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/**
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* Returns the index of the first character in the string that is not a digit,
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* starting at offset.
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*/
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private static int indexOfNonDigit(String string, int offset) {
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for (int i = offset; i < string.length(); i++) {
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char c = string.charAt(i);
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if (c < '0' || c > '9')
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return i;
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}
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return string.length();
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}
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}
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