org.apache.lucene.document
Class DateField
java.lang.Object
org.apache.lucene.document.DateField
public class DateField
extends java.lang.Object
Provides support for converting dates to strings and vice-versa.
The strings are structured so that lexicographic sorting orders by date,
which makes them suitable for use as field values and search terms.
Note that you do not have to use this class, you can just save your
dates as strings if lexicographic sorting orders them by date. This is
the case for example for dates like
yyyy-mm-dd hh:mm:ss
(of course you can leave out the delimiter characters to save some space).
The advantage with using such a format is that you can easily save dates
with the required granularity, e.g. leaving out seconds. This saves memory
when searching with a RangeQuery or PrefixQuery, as Lucene
expands these queries to a BooleanQuery with potentially very many terms.
Note: dates before 1970 cannot be used, and therefore cannot be
indexed when using this class.
static String | MAX_DATE_STRING()
|
static String | MIN_DATE_STRING()
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static String | dateToString(Date date) - Converts a Date to a string suitable for indexing.
|
static Date | stringToDate(String s) - Converts a string-encoded date into a Date object.
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static long | stringToTime(String s) - Converts a string-encoded date into a millisecond time.
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static String | timeToString(long time) - Converts a millisecond time to a string suitable for indexing.
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MAX_DATE_STRING
public static String MAX_DATE_STRING()
MIN_DATE_STRING
public static String MIN_DATE_STRING()
dateToString
public static String dateToString(Date date)
Converts a Date to a string suitable for indexing.
stringToDate
public static Date stringToDate(String s)
Converts a string-encoded date into a Date object.
stringToTime
public static long stringToTime(String s)
Converts a string-encoded date into a millisecond time.
timeToString
public static String timeToString(long time)
Converts a millisecond time to a string suitable for indexing.
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