net.snowflake.common.util

Class Wildcard

java.lang.Object

net.snowflake.common.util.Wildcard

public class Wildcard
extends Object

This class wraps wildcard related functions and regular expression.

Author:

hyu

Constructor Summary

Constructors

Constructor and Description
Wildcard()

Method Summary

Modifier and Type	Method and Description
static boolean	isWildcardPatternStr(String inputString) Used to determine if the input string is wildcard pattern By wildcard pattern, we means a string contains '%' but not '\%' or '_' but not '\_'
static Pattern	toRegexPattern(String wildcardPattern, boolean isCaseSensitive) Converts a wild card pattern to regex
static String	toRegexStr(String wildcardPattern) Convert a wildcard pattern string to a java regex pattern string.

Methods inherited from class java.lang.Object

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

Constructor Detail

Wildcard

public Wildcard()

Method Detail

toRegexStr

public static String toRegexStr(String wildcardPattern)

Convert a wildcard pattern string to a java regex pattern string. The convert way is as follow: 1. Separate the string to several blocks of substring by delimiter % or _ (but not escaped) 2. For each of block substring, remove the escaped string '\' and then quote substring (Quote means everything within quote is treated as literal, not java regex) 3. For every '%' convert to '.*' and for every '_' convert to '.' 4. Append all of them into one final string

Parameters:

wildcardPattern - a SQL wild card pattern

Returns:

regex pattern

toRegexPattern

public static Pattern toRegexPattern(String wildcardPattern,
                                     boolean isCaseSensitive)

Converts a wild card pattern to regex

Parameters:

wildcardPattern - a wild card pattern

isCaseSensitive - is case insensitive?

Returns:

a regex pattern

isWildcardPatternStr

public static boolean isWildcardPatternStr(String inputString)

Used to determine if the input string is wildcard pattern By wildcard pattern, we means a string contains '%' but not '\%' or '_' but not '\_'

Parameters:

inputString - a string

Returns:

true if the string includes a wild card pattern