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package eu.dnetlib.clients.index.model;
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import java.text.DateFormat;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.TimeZone;
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import java.util.regex.Pattern;
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/**
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* helper class for formatting and parsing Values. all methods synchronize on the used local formatter object, so you
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* can use the shared instance. Using multiple instances may improve performance, though, because of less
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* synchronization.
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*/
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public class ValueFormatHelper {
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/**
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* shared global helper instance.
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*/
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public static final ValueFormatHelper INSTANCE = new ValueFormatHelper();
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/**
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* The max. length of strings to be parsed as date.
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*/
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private static final int DATE_LENGTH = 10;
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/**
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* The length of strings to be parsed as date time for (default) pattern 1.
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*/
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private static final int DATE_TIME_LENGTH_PATTERN_DEFAULT = 28;
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/**
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* The length of strings to be parsed as date time for pattern 2 and 3.
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*/
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private static final int DATE_TIME_LENGTH_PATTERN_2_AND_3 = 24;
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/**
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* The length of strings to be parsed as date time for pattern 4.
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*/
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private static final int DATE_TIME_LENGTH_PATTERN_4 = 20;
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/**
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* formatter to create and parse standard string representations of Date values: "yyyy-MM-dd".
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*/
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private final DateFormat _formatDate = new SimpleDateFormat("yyyy-MM-dd");
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/**
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* valid Datetime value pattern with milliseconds and time zone (default for printing).
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*/
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private final DateFormat _formatDateTimePatternDefault = getDefaultDateTimeFormat();
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/**
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* valid Datetime value pattern with time zone.
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*/
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private final DateFormat _formatDateTimePattern2 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ");
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/**
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* valid Datetime value pattern with milliseconds and time zone 'Z' (UTC).
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*/
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private final DateFormat _formatDateTimePattern3 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
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/**
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* valid Datetime value pattern without milliseconds and time zone 'Z' (UTC).
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*/
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private final DateFormat _formatDateTimePattern4 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
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/**
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* pattern for checking if the string might be a date.
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*/
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private final Pattern _formatPatternDateDefault = Pattern.compile("\\d{4}-\\d{2}-\\d{2}");
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/**
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* pattern for checking if the string might be a date time for default pattern.
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*/
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private final Pattern _formatPatternTimeDefault = Pattern.compile("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}[+-]{1}\\d{4}");
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/**
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* pattern for checking if the string might be a date time for pattern 2.
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*/
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private final Pattern _formatPatternTime2 = Pattern.compile("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}[+-]{1}\\d{4}");
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/**
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* pattern for checking if the string might be a date time for pattern 3.
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*/
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private final Pattern _formatPatternTime3 = Pattern.compile("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}Z");
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/**
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* pattern for checking if the string might be a date time for pattern 4.
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*/
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private final Pattern _formatPatternTime4 = Pattern.compile("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}Z");
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/**
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* create local instance.
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*/
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public ValueFormatHelper() {
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_formatDate.setLenient(false);
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_formatDateTimePatternDefault.setLenient(false);
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_formatDateTimePattern2.setLenient(false);
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_formatDateTimePattern3.setLenient(false);
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_formatDateTimePattern3.setTimeZone(TimeZone.getTimeZone("UTC"));
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_formatDateTimePattern4.setLenient(false);
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_formatDateTimePattern4.setTimeZone(TimeZone.getTimeZone("UTC"));
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}
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/**
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* @return the default format for datetime values.
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*/
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public static SimpleDateFormat getDefaultDateTimeFormat() {
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final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
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sdf.setLenient(false);
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return sdf;
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}
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/**
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* format value as Date string.
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*
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* @param value a date value
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* @return formatted date.
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*/
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public String formatDate(final Date value) {
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synchronized (_formatDate) {
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return _formatDate.format(value);
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}
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}
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/**
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* format value as DateTime string.
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*
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* @param value a datetime value
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* @return formatted datetime string
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*/
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public String formatDateTime(final Date value) {
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synchronized (_formatDateTimePatternDefault) {
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return _formatDateTimePatternDefault.format(value);
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}
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}
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/**
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* parse a date string.
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*
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* @param dateString a date string
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* @return parsed Date
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* @throws ParseException string has wrong format
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*/
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public Date parseDate(final String dateString) throws ParseException {
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if (dateString.length() == DATE_LENGTH && _formatPatternDateDefault.matcher(dateString).matches()) {
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synchronized (_formatDate) {
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return _formatDate.parse(dateString);
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}
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} else {
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throw new ParseException("Length of date string '" + dateString + "' exceeds maximum date length of " + DATE_LENGTH, DATE_LENGTH);
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}
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}
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/**
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* parse a date string.
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*
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* @param dateString a date string
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* @return parsed Date if correct format, else null.
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*/
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public Date tryParseDate(final String dateString) {
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if (dateString.length() == DATE_LENGTH && _formatPatternDateDefault.matcher(dateString).matches()) {
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synchronized (_formatDate) {
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try {
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return _formatDate.parse(dateString);
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} catch (final ParseException ex) {
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; // not a date ... fine.
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}
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}
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}
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return null;
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}
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/**
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* parse datetime string.
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*
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* @param dateTimeString a datetime string
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* @return parsed Date
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* @throws ParseException string has wrong format
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*/
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public Date parseDateTime(final String dateTimeString) throws ParseException {
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final Date result;
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final int dateLen = dateTimeString.length();
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if (dateLen == DATE_TIME_LENGTH_PATTERN_DEFAULT && _formatPatternTimeDefault.matcher(dateTimeString).matches()) {
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synchronized (_formatDateTimePatternDefault) {
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result = _formatDateTimePatternDefault.parse(dateTimeString);
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}
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} else if (dateLen == DATE_TIME_LENGTH_PATTERN_2_AND_3 && _formatPatternTime2.matcher(dateTimeString).matches()) {
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synchronized (_formatDateTimePattern2) {
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result = _formatDateTimePattern2.parse(dateTimeString);
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}
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} else if (dateLen == DATE_TIME_LENGTH_PATTERN_2_AND_3 && _formatPatternTime3.matcher(dateTimeString).matches()) {
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synchronized (_formatDateTimePattern3) {
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result = _formatDateTimePattern3.parse(dateTimeString);
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}
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} else if (dateLen == DATE_TIME_LENGTH_PATTERN_4 && _formatPatternTime4.matcher(dateTimeString).matches()) {
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synchronized (_formatDateTimePattern4) {
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result = _formatDateTimePattern4.parse(dateTimeString);
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}
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} else {
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throw new ParseException("Length '" + dateTimeString.length() + "' of datetime string '" + dateTimeString
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+ "' doesn't match expected pattern length", dateTimeString.length());
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}
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return result;
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}
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/**
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* parse datetime string.
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*
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* @param dateTimeString a datetime string
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* @return parsed Date if correct format, else null;
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*/
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public Date tryParseDateTime(final String dateTimeString) {
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Date result = null;
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try {
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switch (dateTimeString.length()) {
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case DATE_TIME_LENGTH_PATTERN_DEFAULT:
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if (_formatPatternTimeDefault.matcher(dateTimeString).matches()) {
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synchronized (_formatDateTimePatternDefault) {
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result = _formatDateTimePatternDefault.parse(dateTimeString);
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}
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}
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break;
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case DATE_TIME_LENGTH_PATTERN_2_AND_3:
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if (_formatPatternTime2.matcher(dateTimeString).matches()) {
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synchronized (_formatDateTimePattern2) {
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result = _formatDateTimePattern2.parse(dateTimeString);
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}
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} else if (_formatPatternTime3.matcher(dateTimeString).matches()) {
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synchronized (_formatDateTimePattern3) {
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result = _formatDateTimePattern3.parse(dateTimeString);
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}
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}
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break;
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case DATE_TIME_LENGTH_PATTERN_4:
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if (_formatPatternTime4.matcher(dateTimeString).matches()) {
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synchronized (_formatDateTimePattern4) {
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result = _formatDateTimePattern4.parse(dateTimeString);
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}
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}
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break;
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default:
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break;
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}
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} catch (final ParseException ex) {
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; // not a datetime ... fine.
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}
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return result;
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}
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}
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