io.greptime.common.util

Class Strings

java.lang.Object

io.greptime.common.util.Strings

public final class Strings
extends Object

Static utility methods pertaining to String or CharSequence instances.

Author:

jiachun.fjc

Method Summary

Modifier and Type	Method and Description
static String	emptyToNull(String string) Returns the given string if it is nonempty; null otherwise.
static boolean	isBlank(String str) Checks if a string is whitespace, empty ("") or null.
static boolean	isNotBlank(String str) Checks if a string is not empty (""), not null and not whitespace only.
static boolean	isNullOrEmpty(String str) Returns true if the given string is null or is the empty string.
static String	nullToEmpty(String string) Returns the given string if it is non-null; the empty string otherwise.
static String[]	split(String str, char separator) Splits the provided text into an array, separator specified.
static String[]	split(String str, char separator, boolean preserveAllTokens) Splits the provided text into an array, separator specified, if true, preserving all tokens, including empty tokens created by adjacent separators.
static String	toString(Object obj)

Methods inherited from class java.lang.Object

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

Method Detail

toString

public static String toString(Object obj)

nullToEmpty

public static String nullToEmpty(String string)

Returns the given string if it is non-null; the empty string otherwise.

emptyToNull

public static String emptyToNull(String string)

Returns the given string if it is nonempty; null otherwise.

isNullOrEmpty

public static boolean isNullOrEmpty(String str)

Returns true if the given string is null or is the empty string.

isBlank

public static boolean isBlank(String str)

Checks if a string is whitespace, empty ("") or null.

Strings.isBlank(null) = true Strings.isBlank("") = true Strings.isBlank(" ") = true Strings.isBlank("bob") = false Strings.isBlank(" bob ") = false

isNotBlank

public static boolean isNotBlank(String str)

Checks if a string is not empty (""), not null and not whitespace only.

Strings.isNotBlank(null) = false Strings.isNotBlank("") = false Strings.isNotBlank(" ") = false Strings.isNotBlank("bob") = true Strings.isNotBlank(" bob ") = true

split

public static String[] split(String str,
                             char separator)

Splits the provided text into an array, separator specified.

A null input String returns null.

Strings.split(null, *) = null Strings.split("", *) = [] Strings.split("a.b.c", '.') = ["a", "b", "c"] Strings.split("a..b.c", '.') = ["a", "b", "c"] Strings.split("a:b:c", '.') = ["a:b:c"] Strings.split("a b c", ' ') = ["a", "b", "c"]

split

public static String[] split(String str,
                             char separator,
                             boolean preserveAllTokens)

Splits the provided text into an array, separator specified, if true, preserving all tokens, including empty tokens created by adjacent separators.

A null input String returns null.

Strings.split(null, *, true) = null Strings.split("", *, true) = [] Strings.split("a.b.c", '.', true) = ["a", "b", "c"] Strings.split("a..b.c", '.', true) = ["a", "", "b", "c"] Strings.split("a:b:c", '.', true) = ["a:b:c"] Strings.split("a b c", ' ', true) = ["a", "b", "c"] Strings.split("a b c ", ' ', true) = ["a", "b", "c", ""] Strings.split("a b c ", ' ', true) = ["a", "b", "c", "", ""] Strings.split(" a b c", ' ', true) = ["", a", "b", "c"] Strings.split(" a b c", ' ', true) = ["", "", a", "b", "c"] Strings.split(" a b c ", ' ', true) = ["", a", "b", "c", ""]