Added New DateTime parser implementation

Signed-off-by: Prabhat Sharma <[email protected]>

server/src/main/java/org/opensearch/common/time/CustomDateTimeFormatter.java

@@ -0,0 +1,109 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.common.time;
+
+import java.text.Format;
+import java.text.ParsePosition;
+import java.time.ZoneId;
+import java.time.chrono.Chronology;
+import java.time.format.DateTimeFormatter;
+import java.time.temporal.TemporalAccessor;
+import java.time.temporal.TemporalQuery;
+import java.util.Locale;
+
+public class CustomDateTimeFormatter {
+    private final DateTimeFormatter formatter;
+
+    public CustomDateTimeFormatter(String pattern) {
+        this.formatter = DateTimeFormatter.ofPattern(pattern, Locale.ROOT);
+    }
+
+    public CustomDateTimeFormatter(String pattern, Locale locale) {
+        this.formatter = DateTimeFormatter.ofPattern(pattern, locale);
+    }
+
+    public CustomDateTimeFormatter(DateTimeFormatter formatter) {
+        this.formatter = formatter;
+    }
+
+    public static CustomDateTimeFormatter ofPattern(String pattern) {
+        return new CustomDateTimeFormatter(pattern);
+    }
+
+    public static CustomDateTimeFormatter ofPattern(String pattern, Locale locale) {
+        return new CustomDateTimeFormatter(pattern, locale);
+    }
+
+    public static final CustomDateTimeFormatter ISO_LOCAL_DATE = new CustomDateTimeFormatter(DateTimeFormatter.ISO_LOCAL_DATE);
+    public static final CustomDateTimeFormatter ISO_LOCAL_TIME = new CustomDateTimeFormatter(DateTimeFormatter.ISO_LOCAL_TIME);
+    public static final CustomDateTimeFormatter ISO_LOCAL_DATE_TIME = new CustomDateTimeFormatter(DateTimeFormatter.ISO_LOCAL_DATE_TIME);
+    public static final CustomDateTimeFormatter ISO_INSTANT = new CustomDateTimeFormatter(DateTimeFormatter.ISO_INSTANT);
+    public static final CustomDateTimeFormatter ISO_OFFSET_DATE_TIME = new CustomDateTimeFormatter(DateTimeFormatter.ISO_OFFSET_DATE_TIME);
+    public static final CustomDateTimeFormatter ISO_ZONED_DATE_TIME = new CustomDateTimeFormatter(DateTimeFormatter.ISO_ZONED_DATE_TIME);
+    public static final CustomDateTimeFormatter ISO_DATE = new CustomDateTimeFormatter(DateTimeFormatter.ISO_DATE);
+    public static final CustomDateTimeFormatter ISO_TIME = new CustomDateTimeFormatter(DateTimeFormatter.ISO_TIME);
+    public static final CustomDateTimeFormatter ISO_OFFSET_TIME = new CustomDateTimeFormatter(DateTimeFormatter.ISO_OFFSET_TIME);
+    public static final CustomDateTimeFormatter ISO_OFFSET_DATE = new CustomDateTimeFormatter(DateTimeFormatter.ISO_OFFSET_DATE);
+    public static final CustomDateTimeFormatter ISO_ORDINAL_DATE = new CustomDateTimeFormatter(DateTimeFormatter.ISO_ORDINAL_DATE);
+    public static final CustomDateTimeFormatter ISO_WEEK_DATE = new CustomDateTimeFormatter(DateTimeFormatter.ISO_WEEK_DATE);
+    public static final CustomDateTimeFormatter ISO_DATE_TIME = new CustomDateTimeFormatter(DateTimeFormatter.ISO_DATE_TIME);
+    public static final CustomDateTimeFormatter BASIC_ISO_DATE = new CustomDateTimeFormatter(DateTimeFormatter.BASIC_ISO_DATE);
+
+    public CustomDateTimeFormatter withLocale(Locale locale) {
+        return new CustomDateTimeFormatter(getFormatter().withLocale(locale));
+    }
+
+    public CustomDateTimeFormatter withZone(ZoneId zoneId) {
+        return new CustomDateTimeFormatter(getFormatter().withZone(zoneId));
+    }
+
+    public CustomDateTimeFormatter withChronology(Chronology chrono) {
+        return new CustomDateTimeFormatter(getFormatter().withChronology(chrono));
+    }
+
+    public String format(TemporalAccessor temporal) {
+        return this.getFormatter().format(temporal);
+    }
+
+    public TemporalAccessor parse(CharSequence text, ParsePosition position) {
+        return this.getFormatter().parse(text, position);
+    }
+
+    public TemporalAccessor parse(CharSequence text) {
+        return this.getFormatter().parse(text);
+    }
+
+    public <T> T parse(CharSequence text, TemporalQuery<T> query) {
+        return this.getFormatter().parse(text, query);
+    }
+
+    public ZoneId getZone() {
+        return this.getFormatter().getZone();
+    }
+
+    public Locale getLocale() {
+        return this.getFormatter().getLocale();
+    }
+
+    public TemporalAccessor parse(String input) {
+        return formatter.parse(input);
+    }
+
+    public DateTimeFormatter getFormatter() {
+        return formatter;
+    }
+
+    public Format toFormat() {
+        return getFormatter().toFormat();
+    }
+
+    public Object parseObject(String text, ParsePosition pos) {
+        return getFormatter().toFormat().parseObject(text, pos);
+    }
+}

server/src/main/java/org/opensearch/common/time/DateFormatters.java

@@ -1299,6 +1299,41 @@ public class DateFormatters {
             .withResolverStyle(ResolverStyle.STRICT)
     );
 
+    /**
+     * Returns RFC 3339 a popular ISO 8601 profile compatible date time formatter and parser.
+     * This is not fully compatible to the existing spec, its more linient and closely follows w3c note on datetime
+     */
+
+    public static final DateFormatter RFC3339_DATE_FORMATTER = new JavaDateFormatter(
+        "rfc3339_date_time",
+        new CustomDateTimeFormatter(STRICT_DATE_OPTIONAL_TIME_PRINTER),
+        new RFC3339Parser(
+            new DateTimeFormatterBuilder().append(DATE_FORMATTER)
+                .optionalStart()
+                .appendLiteral('T')
+                .appendValue(HOUR_OF_DAY, 1, 2, SignStyle.NOT_NEGATIVE)
+                .appendLiteral(':')
+                .appendValue(MINUTE_OF_HOUR, 1, 2, SignStyle.NOT_NEGATIVE)
+                .optionalStart()
+                .appendLiteral(':')
+                .appendValue(SECOND_OF_MINUTE, 1, 2, SignStyle.NOT_NEGATIVE)
+                .optionalStart()
+                .appendFraction(NANO_OF_SECOND, 1, 9, true)
+                .optionalEnd()
+                .optionalStart()
+                .appendLiteral(',')
+                .appendFraction(NANO_OF_SECOND, 1, 9, false)
+                .optionalEnd()
+                .optionalStart()
+                .appendOffsetId()
+                .optionalEnd()
+                .optionalEnd()
+                .optionalEnd()
+                .toFormatter(Locale.ROOT)
+                .withResolverStyle(ResolverStyle.STRICT)
+        )
+    );
+
     private static final DateTimeFormatter HOUR_MINUTE_SECOND_FORMATTER = new DateTimeFormatterBuilder().append(HOUR_MINUTE_FORMATTER)
         .appendLiteral(":")
         .appendValue(SECOND_OF_MINUTE, 1, 2, SignStyle.NOT_NEGATIVE)
@@ -2152,6 +2187,8 @@ static DateFormatter forPattern(String input) {
             return STRICT_YEAR_MONTH;
         } else if (FormatNames.STRICT_YEAR_MONTH_DAY.matches(input)) {
             return STRICT_YEAR_MONTH_DAY;
+        } else if (FormatNames.RFC3339_DATE_TIME.matches(input)) {
+            return RFC3339_DATE_FORMATTER;
         } else {
             try {
                 return new JavaDateFormatter(

server/src/main/java/org/opensearch/common/time/DateTime.java

@@ -0,0 +1,225 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.common.time;
+
+import java.time.DateTimeException;
+import java.time.LocalDate;
+import java.time.OffsetDateTime;
+import java.time.Year;
+import java.time.ZoneOffset;
+import java.time.temporal.ChronoField;
+import java.util.Objects;
+import java.util.Optional;
+
+/**
+ * Container class for parsed date/date-time data.
+ */
+public class DateTime {
+    private final int year;
+    private final int month;
+    private final int day;
+    private final int hour;
+    private final int minute;
+    private final int second;
+    private final int nano;
+    private final ZoneOffset offset;
+    private final int fractionDigits;
+
+    public DateTime(
+        final int year,
+        final int month,
+        final int day,
+        final int hour,
+        final int minute,
+        final int second,
+        final int nano,
+        final ZoneOffset offset,
+        final int fractionDigits
+    ) {
+        this.year = year;
+        this.month = assertSize(month, 1, 12, ChronoField.MONTH_OF_YEAR);
+        this.day = assertSize(day, 1, 31, ChronoField.DAY_OF_MONTH);
+        this.hour = assertSize(hour, 0, 23, ChronoField.HOUR_OF_DAY);
+        this.minute = assertSize(minute, 0, 59, ChronoField.MINUTE_OF_HOUR);
+        this.second = assertSize(second, 0, 60, ChronoField.SECOND_OF_MINUTE);
+        this.nano = assertSize(nano, 0, 999_999_999, ChronoField.NANO_OF_SECOND);
+        this.offset = offset;
+        this.fractionDigits = fractionDigits;
+    }
+
+    /**
+     * Create a new instance with second granularity from the input parameters
+     */
+    public static DateTime of(int year, int month, int day, int hour, int minute, int second, ZoneOffset offset) {
+        return new DateTime(year, month, day, hour, minute, second, 0, offset, 0);
+    }
+
+    /**
+     * Create a new instance with nanosecond granularity from the input parameters
+     */
+    public static DateTime of(
+        int year,
+        int month,
+        int day,
+        int hour,
+        int minute,
+        int second,
+        int nanos,
+        ZoneOffset offset,
+        final int fractionDigits
+    ) {
+        return new DateTime(year, month, day, hour, minute, second, nanos, offset, fractionDigits);
+    }
+
+    /**
+     * Create a new instance with year granularity from the input parameters
+     */
+    public static DateTime ofYear(int year) {
+        return new DateTime(year, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC, 0);
+    }
+
+    /**
+     * Create a new instance with year-month granularity from the input parameters
+     */
+    public static DateTime ofYearMonth(int years, int months) {
+        return new DateTime(years, months, 1, 0, 0, 0, 0, ZoneOffset.UTC, 0);
+    }
+
+    /**
+     * Create a new instance with day granularity from the input parameters
+     */
+    public static DateTime ofDate(int years, int months, int days) {
+        return new DateTime(years, months, days, 0, 0, 0, 0, ZoneOffset.UTC, 0);
+    }
+
+    /**
+     * Create a new instance with minute granularity from the input parameters
+     */
+    public static DateTime of(int years, int months, int days, int hours, int minute, ZoneOffset offset) {
+        return new DateTime(years, months, days, hours, minute, 0, 0, offset, 0);
+    }
+
+    public static DateTime of(int years, int months, int days, int hours, int minute) {
+        return new DateTime(years, months, days, hours, minute, 0, 0, ZoneOffset.UTC, 0);
+    }
+
+    private int assertSize(int value, int min, int max, ChronoField field) {
+        if (value > max) {
+            throw new DateTimeException("Field " + field.name() + " out of bounds. Expected " + min + "-" + max + ", got " + value);
+        }
+        return value;
+    }
+
+    public int getYear() {
+        return year;
+    }
+
+    public int getMonth() {
+        return month;
+    }
+
+    public int getDayOfMonth() {
+        return day;
+    }
+
+    public int getHour() {
+        return hour;
+    }
+
+    public int getMinute() {
+        return minute;
+    }
+
+    public int getSecond() {
+        return second;
+    }
+
+    public int getNano() {
+        return nano;
+    }
+
+    /**
+     * Returns the time offset, if available
+     *
+     * @return the time offset, if available
+     */
+    public Optional<ZoneOffset> getOffset() {
+        return Optional.ofNullable(offset);
+    }
+
+    /**
+     * Creates a {@link Year} discarding any higher granularity fields
+     *
+     * @return the {@link Year}
+     */
+    public Year toYear() {
+        return Year.of(year);
+    }
+
+    /**
+     * Creates an {@link OffsetDateTime}
+     *
+     * @return the {@link OffsetDateTime}
+     */
+    public OffsetDateTime toOffsetDatetime() {
+        if (offset != null) {
+            return OffsetDateTime.of(year, month, day, hour, minute, second, nano, offset);
+        }
+        throw new DateTimeException("No zone offset information found");
+    }
+
+    /**
+     * Creates a {@link LocalDate}, discarding any higher granularity fields
+     *
+     * @return the {@link LocalDate}
+     */
+    public LocalDate toLocalDate() {
+        return LocalDate.of(year, month, day);
+    }
+
+    /**
+     * Return the number of significant fraction digits in the second.
+     *
+     * @return The number of significant fraction digits
+     */
+    public int getFractionDigits() {
+        return fractionDigits;
+    }
+
+    /**
+     * * @hidden
+     */
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DateTime dateTime = (DateTime) o;
+        return year == dateTime.year
+            && month == dateTime.month
+            && day == dateTime.day
+            && hour == dateTime.hour
+            && minute == dateTime.minute
+            && second == dateTime.second
+            && nano == dateTime.nano
+            && fractionDigits == dateTime.fractionDigits
+            && Objects.equals(offset, dateTime.offset);
+    }
+
+    /**
+     * @hidden
+     */
+    @Override
+    public int hashCode() {
+        return Objects.hash(year, month, day, hour, minute, second, nano, offset, fractionDigits);
+    }
+}

server/src/main/java/org/opensearch/common/time/FormatNames.java

@@ -44,6 +44,7 @@
  */
 public enum FormatNames {
     ISO8601(null, "iso8601"),
+    RFC3339_DATE_TIME(null, "rfc3339"),
     BASIC_DATE("basicDate", "basic_date"),
     BASIC_DATE_TIME("basicDateTime", "basic_date_time"),
     BASIC_DATE_TIME_NO_MILLIS("basicDateTimeNoMillis", "basic_date_time_no_millis"),