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using PrefixQuery = Lucene.Net.Search.PrefixQuery; // for javadoc
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using RangeQuery = Lucene.Net.Search.RangeQuery; // for javadoc
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using PrefixQuery = Lucene.Net.Search.PrefixQuery;
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using RangeQuery = Lucene.Net.Search.RangeQuery;
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namespace Lucene.Net.Documents
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/// <summary> Provides support for converting dates to strings and vice-versa.
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/// The strings are structured so that lexicographic sorting orders by date,
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/// which makes them suitable for use as field values and search terms.
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/// <P>Note that this class saves dates with millisecond granularity,
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/// which is bad for {@link RangeQuery} and {@link PrefixQuery}, as those
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/// queries are expanded to a BooleanQuery with a potentially large number
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/// of terms when searching. Thus you might want to use
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/// {@link DateTools} instead.
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/// Note: dates before 1970 cannot be used, and therefore cannot be
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/// indexed when using this class. See {@link DateTools} for an
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/// alternative without such a limitation.
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/// <deprecated> If you build a new index, use {@link DateTools} instead. For
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/// existing indices you can continue using this class, as it will not be
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/// removed in the near future despite being deprecated.
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public class DateField
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// make date strings long enough to last a millenium
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private static int DATE_LEN = SupportClass.Number.ToString(
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/// <summary> Provides support for converting dates to strings and vice-versa.
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/// The strings are structured so that lexicographic sorting orders by date,
28
/// which makes them suitable for use as field values and search terms.
30
/// <P>Note that this class saves dates with millisecond granularity,
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/// which is bad for {@link RangeQuery} and {@link PrefixQuery}, as those
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/// queries are expanded to a BooleanQuery with a potentially large number
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/// of terms when searching. Thus you might want to use
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/// {@link DateTools} instead.
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/// Note: dates before 1970 cannot be used, and therefore cannot be
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/// indexed when using this class. See {@link DateTools} for an
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/// alternative without such a limitation.
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/// <deprecated> If you build a new index, use {@link DateTools} instead. This class is included for use with existing
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/// indices and will be removed in a future release.
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public class DateField
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// make date strings long enough to last a millenium
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private static int DATE_LEN = SupportClass.Number.ToString(
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1000L * 365 * 24 * 60 * 60 * 1000, 16).Length;
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public static System.String MIN_DATE_STRING()
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return TimeToString(0);
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public static System.String MAX_DATE_STRING()
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char[] buffer = new char[DATE_LEN];
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char c = SupportClass.Character.ForDigit(36 - 1, SupportClass.Character.MAX_RADIX);
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for (int i = 0; i < DATE_LEN; i++)
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return new System.String(buffer);
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/// <summary> Converts a Date to a string suitable for indexing.</summary>
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/// <throws> RuntimeException if the date specified in the </throws>
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/// <summary> method argument is before 1970
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public static System.String DateToString(System.DateTime date)
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public static System.String MIN_DATE_STRING()
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return TimeToString(0);
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public static System.String MAX_DATE_STRING()
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char[] buffer = new char[DATE_LEN];
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char c = SupportClass.Character.ForDigit(36 - 1, SupportClass.Character.MAX_RADIX);
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for (int i = 0; i < DATE_LEN; i++)
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return new System.String(buffer);
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/// <summary> Converts a Date to a string suitable for indexing.</summary>
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/// <throws> SystemException if the date specified in the </throws>
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/// <summary> method argument is before 1970
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public static System.String DateToString(System.DateTime date)
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TimeSpan ts = date.Subtract(new DateTime(1970, 1, 1));
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ts = ts.Subtract(TimeZone.CurrentTimeZone.GetUtcOffset(date));
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return TimeToString(ts.Ticks / TimeSpan.TicksPerMillisecond);
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/// <summary> Converts a millisecond time to a string suitable for indexing.</summary>
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/// <throws> RuntimeException if the time specified in the </throws>
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/// <summary> method argument is negative, that is, before 1970
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public static System.String TimeToString(long time)
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throw new System.SystemException("time '" + time + "' is too early, must be >= 0");
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System.String s = SupportClass.Number.ToString(time, SupportClass.Number.MAX_RADIX);
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if (s.Length > DATE_LEN)
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throw new System.SystemException("time '" + time + "' is too late, length of string " + "representation must be <= " + DATE_LEN);
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// Pad with leading zeros
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if (s.Length < DATE_LEN)
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System.Text.StringBuilder sb = new System.Text.StringBuilder(s);
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while (sb.Length < DATE_LEN)
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/// <summary>Converts a string-encoded date into a millisecond time. </summary>
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public static long StringToTime(System.String s)
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return SupportClass.Number.Parse(s, SupportClass.Number.MAX_RADIX);
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/// <summary>Converts a string-encoded date into a Date object. </summary>
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public static System.DateTime StringToDate(System.String s)
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long ticks = StringToTime(s) * TimeSpan.TicksPerMillisecond;
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System.DateTime date = new System.DateTime(1970, 1, 1);
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date = date.AddTicks(ticks);
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date = date.Add(TimeZone.CurrentTimeZone.GetUtcOffset(date));
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/// <summary> Converts a millisecond time to a string suitable for indexing.</summary>
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/// <throws> SystemException if the time specified in the </throws>
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/// <summary> method argument is negative, that is, before 1970
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public static System.String TimeToString(long time)
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throw new System.SystemException("time '" + time + "' is too early, must be >= 0");
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System.String s = SupportClass.Number.ToString(time, SupportClass.Number.MAX_RADIX);
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if (s.Length > DATE_LEN)
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throw new System.SystemException("time '" + time + "' is too late, length of string " + "representation must be <= " + DATE_LEN);
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// Pad with leading zeros
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if (s.Length < DATE_LEN)
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System.Text.StringBuilder sb = new System.Text.StringBuilder(s);
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while (sb.Length < DATE_LEN)
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/// <summary>Converts a string-encoded date into a millisecond time. </summary>
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public static long StringToTime(System.String s)
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return SupportClass.Number.Parse(s, SupportClass.Number.MAX_RADIX);
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/// <summary>Converts a string-encoded date into a Date object. </summary>
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public static System.DateTime StringToDate(System.String s)
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long ticks = StringToTime(s) * TimeSpan.TicksPerMillisecond;
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System.DateTime date = new System.DateTime(1970, 1, 1);
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date = date.AddTicks(ticks);
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date = date.Add(TimeZone.CurrentTimeZone.GetUtcOffset(date));
b'\\ No newline at end of file'
added
removed
beagled/Lucene.Net/Document/DateField.cs
