Note that this class saves dates with millisecond granularity, - * which is bad for {@link TermRangeQuery} and {@link PrefixQuery}, as those - * queries are expanded to a BooleanQuery with a potentially large number - * of terms when searching. Thus you might want to use - * {@link DateTools} instead. - * - *
- * Note: dates before 1970 cannot be used, and therefore cannot be - * indexed when using this class. See {@link DateTools} for an - * alternative without such a limitation. - * - *
- * Another approach is {@link NumericUtils}, which provides
- * a sortable binary representation (prefix encoded) of numeric values, which
- * date/time are.
- * For indexing a {@link Date} or {@link Calendar}, just get the unix timestamp as
- * long using {@link Date#getTime} or {@link Calendar#getTimeInMillis} and
- * index this as a numeric value with {@link NumericField}
- * and use {@link NumericRangeQuery} to query it.
- *
- * @deprecated If you build a new index, use {@link DateTools} or
- * {@link NumericField} instead.
- * This class is included for use with existing
- * indices and will be removed in a future release (possibly Lucene 4.0).
- */
-@Deprecated
-public class DateField {
-
- private DateField() {}
-
- // make date strings long enough to last a millenium
- private static int DATE_LEN = Long.toString(1000L*365*24*60*60*1000,
- Character.MAX_RADIX).length();
-
- public static String MIN_DATE_STRING() {
- return timeToString(0);
- }
-
- public static String MAX_DATE_STRING() {
- char[] buffer = new char[DATE_LEN];
- char c = Character.forDigit(Character.MAX_RADIX-1, Character.MAX_RADIX);
- for (int i = 0 ; i < DATE_LEN; i++)
- buffer[i] = c;
- return new String(buffer);
- }
-
- /**
- * Converts a Date to a string suitable for indexing.
- * @throws RuntimeException if the date specified in the
- * method argument is before 1970
- */
- public static String dateToString(Date date) {
- return timeToString(date.getTime());
- }
- /**
- * Converts a millisecond time to a string suitable for indexing.
- * @throws RuntimeException if the time specified in the
- * method argument is negative, that is, before 1970
- */
- public static String timeToString(long time) {
- if (time < 0)
- throw new RuntimeException("time '" + time + "' is too early, must be >= 0");
-
- String s = Long.toString(time, Character.MAX_RADIX);
-
- if (s.length() > DATE_LEN)
- throw new RuntimeException("time '" + time + "' is too late, length of string " +
- "representation must be <= " + DATE_LEN);
-
- // Pad with leading zeros
- if (s.length() < DATE_LEN) {
- StringBuilder sb = new StringBuilder(s);
- while (sb.length() < DATE_LEN)
- sb.insert(0, 0);
- s = sb.toString();
- }
-
- return s;
- }
-
- /** Converts a string-encoded date into a millisecond time. */
- public static long stringToTime(String s) {
- return Long.parseLong(s, Character.MAX_RADIX);
- }
- /** Converts a string-encoded date into a Date object. */
- public static Date stringToDate(String s) {
- return new Date(stringToTime(s));
- }
-}