org.apache.lucene.document

Class NumberTools


public class NumberTools
extends Object

Provides support for converting longs to Strings, and back again. The strings are structured so that lexicographic sorting order is preserved.

That is, if l1 is less than l2 for any two longs l1 and l2, then NumberTools.longToString(l1) is lexicographically less than NumberTools.longToString(l2). (Similarly for "greater than" and "equals".)

This class handles all long values (unlike DateField).

Author:
Matt Quail (spud at madbean dot com)

Field Summary

static String
MAX_STRING_VALUE
Equivalent to longToString(Long.MAX_VALUE)
static String
MIN_STRING_VALUE
Equivalent to longToString(Long.MIN_VALUE)
static int
STR_SIZE
The length of (all) strings returned by longToString(long)

Method Summary

static String
longToString(long l)
Converts a long to a String suitable for indexing.
static long
stringToLong(String str)
Converts a String that was returned by longToString(long) back to a long.

Field Details

MAX_STRING_VALUE

public static final String MAX_STRING_VALUE
Equivalent to longToString(Long.MAX_VALUE)

MIN_STRING_VALUE

public static final String MIN_STRING_VALUE
Equivalent to longToString(Long.MIN_VALUE)

STR_SIZE

public static final int STR_SIZE

Method Details

longToString

public static String longToString(long l)
Converts a long to a String suitable for indexing.

stringToLong

public static long stringToLong(String str)

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