org.apache.flink.util

类 StringValueUtils

java.lang.Object

org.apache.flink.util.StringValueUtils

@PublicEvolving
public final class StringValueUtils
extends Object

Utility class for efficient operations on StringValue.

All methods in this class are written to be optimized for efficiency and work directly on the StringValues char arrays, avoiding copies. For simplicity and efficiency, the methods only apply to strings whose characters are representable in a single char, ie. strings without surrogate characters.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	StringValueUtils.WhitespaceTokenizer A tokenizer for string values that uses whitespace characters as token delimiters.

方法概要

限定符和类型	方法和说明
static void	replaceNonWordChars(StringValue string, char replacement) Replaces all non-word characters in a string by a given character.
static void	toLowerCase(StringValue string) Converts the given StringValue into a lower case variant.

从类继承的方法 java.lang.Object

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

方法详细资料

toLowerCase

public static void toLowerCase(StringValue string)

Converts the given StringValue into a lower case variant.

参数:

string - The string to convert to lower case.

replaceNonWordChars

public static void replaceNonWordChars(StringValue string,
                                       char replacement)

Replaces all non-word characters in a string by a given character. The only characters not replaced are the characters that qualify as word characters or digit characters with respect to Character.isLetter(char) or Character.isDigit(char), as well as the underscore character.

This operation is intended to simplify strings for counting distinct words.

参数:

string - The string value to have the non-word characters replaced.

replacement - The character to use as the replacement.