org.apache.lucene.analysis.cn.smart
Class Utility

java.lang.Object
  org.apache.lucene.analysis.cn.smart.Utility

public class Utility
extends Object

SmartChineseAnalyzer utility constants and methods

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

static char[]	COMMON_DELIMITER Delimiters will be filtered to this character by SegTokenFilter
static char[]	END_CHAR_ARRAY
static int	MAX_FREQUENCE Maximum bigram frequency (used in the smoothing function).
static char[]	NUMBER_CHAR_ARRAY
static String	SPACES Space-like characters that need to be skipped: such as space, tab, newline, carriage return.
static char[]	START_CHAR_ARRAY
static char[]	STRING_CHAR_ARRAY

Constructor Summary

Utility()

Method Summary

static int	compareArray(char[] larray, int lstartIndex, char[] rarray, int rstartIndex) compare two arrays starting at the specified offsets.
static int	compareArrayByPrefix(char[] shortArray, int shortIndex, char[] longArray, int longIndex) Compare two arrays, starting at the specified offsets, but treating shortArray as a prefix to longArray.
static int	getCharType(char ch) Return the internal CharType constant of a given character.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

STRING_CHAR_ARRAY

public static final char[] STRING_CHAR_ARRAY

NUMBER_CHAR_ARRAY

public static final char[] NUMBER_CHAR_ARRAY

START_CHAR_ARRAY

public static final char[] START_CHAR_ARRAY

END_CHAR_ARRAY

public static final char[] END_CHAR_ARRAY

COMMON_DELIMITER

public static final char[] COMMON_DELIMITER

Delimiters will be filtered to this character by SegTokenFilter

SPACES

public static final String SPACES

Space-like characters that need to be skipped: such as space, tab, newline, carriage return.

See Also:

Constant Field Values

MAX_FREQUENCE

public static final int MAX_FREQUENCE

Maximum bigram frequency (used in the smoothing function).

See Also:

Constant Field Values

Constructor Detail

Utility

public Utility()

Method Detail

compareArray

public static int compareArray(char[] larray,
                               int lstartIndex,
                               char[] rarray,
                               int rstartIndex)

compare two arrays starting at the specified offsets.

Parameters:

larray - left array

lstartIndex - start offset into larray

rarray - right array

rstartIndex - start offset into rarray

Returns:

0 if the arrays are equal，1 if larray > rarray, -1 if larray < rarray

compareArrayByPrefix

public static int compareArrayByPrefix(char[] shortArray,
                                       int shortIndex,
                                       char[] longArray,
                                       int longIndex)

Compare two arrays, starting at the specified offsets, but treating shortArray as a prefix to longArray. As long as shortArray is a prefix of longArray, return 0. Otherwise, behave as compareArray(char[], int, char[], int)

Parameters:

shortArray - prefix array

shortIndex - offset into shortArray

longArray - long array (word)

longIndex - offset into longArray

Returns:

0 if shortArray is a prefix of longArray, otherwise act as compareArray(char[], int, char[], int)

getCharType

public static int getCharType(char ch)

Return the internal CharType constant of a given character.

Parameters:

ch - input character

Returns:

constant from CharType describing the character type.

See Also:

CharType