StringUtils (micronaut 3.9.3 API)

java.lang.Object
- io.micronaut.core.util.StringUtils

```
public final class StringUtils
extends Object
```
Utility methods for Strings.

Since:

1.0

Author:

Graeme Rocher

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`EMPTY_STRING` Constant for an empty String.
`static String[]`	`EMPTY_STRING_ARRAY` Constant for an empty String array.
`static String`	`FALSE` Constant for the value false.
`static char`	`SPACE` a space.
`static String`	`TRUE` Constant for the value true.

Constructor Summary

Constructors
Constructor and Description

StringUtils()

Constructors
Constructor and Description
`StringUtils()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static String`	`capitalize(String str)` Capitalizes the first character of the provided string.
`static String`	`convertDotToUnderscore(String dottedProperty)` Replace the dots in the property with underscore and transform to uppercase.
`static String`	`convertDotToUnderscore(String dottedProperty, boolean uppercase)` Replace the dots in the property with underscore and transform to uppercase based on given flag.
`static boolean`	`hasText(CharSequence str)` Return whether the given string has non whitespace characters.
`static List<String>`	`internListOf(Object... objects)` Converts the given objects into a set of interned strings contained within an internal pool of sets.
`static Map<String,Object>`	`internMapOf(Object... values)` Converts the given objects into a map of interned strings.
`static boolean`	`isDigits(String str)` Is the given string a series of digits.
`static boolean`	`isEmpty(CharSequence str)` Return whether the given string is empty.
`static boolean`	`isNotEmpty(CharSequence str)` Return whether the given string is not empty.
`static boolean`	`isTrue(String booleanString)` Is the boolean string true.
`static Locale`	`parseLocale(String localeValue)` Parse the given `String` value into a `Locale`, accepting the `Locale.toString()` format as well as BCP 47 language tags.
`static String`	`prependUri(String baseUri, String uri)` Prepends a partial uri and normalizes / characters.
`static Iterable<String>`	`splitOmitEmptyStrings(CharSequence sequence, char splitCharacter)` Fast split by one character iterable.
`static Iterator<String>`	`splitOmitEmptyStringsIterator(CharSequence sequence, char splitCharacter)` Fast split by one character iterator.
`static List<String>`	`splitOmitEmptyStringsList(CharSequence sequence, char splitCharacter)` Fast split by one character iterable.
`static String[]`	`tokenizeToStringArray(String str, String delimiters)` Tokenize the given String into a String array via a StringTokenizer.
`static String[]`	`tokenizeToStringArray(String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens)` Tokenize the given String into a String array via a StringTokenizer.
`static String`	`trimLeading(String str, Predicate<Character> predicate)` Returns a new string without any leading characters that match the supplied predicate.
`static String`	`trimLeadingCharacter(String str, char c)` Returns a new string without any leading characters that match the supplied character.
`static String`	`trimLeadingWhitespace(String str)` Returns a new string without any leading whitespace.
`static String`	`trimToNull(String string)` Trims the supplied string.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - TRUE
```
public static final String TRUE
```
    Constant for the value true.
    
    See Also:
    
    Constant Field Values
  - FALSE
```
public static final String FALSE
```
    Constant for the value false.
    
    See Also:
    
    Constant Field Values
  - EMPTY_STRING_ARRAY
```
public static final String[] EMPTY_STRING_ARRAY
```
    Constant for an empty String array.
  - EMPTY_STRING
```
public static final String EMPTY_STRING
```
    Constant for an empty String.
    
    See Also:
    
    Constant Field Values
  - SPACE
```
public static final char SPACE
```
    a space.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - StringUtils
```
public StringUtils()
```
- Method Detail
  - isEmpty
```
public static boolean isEmpty(@Nullable
                              CharSequence str)
```
    Return whether the given string is empty.
    
    Parameters:
    
    str - The string
    
    Returns:
    
    True if str is empty or null
  - isNotEmpty
```
public static boolean isNotEmpty(@Nullable
                                 CharSequence str)
```
    Return whether the given string is not empty.
    
    Parameters:
    
    str - The string
    
    Returns:
    
    True if str is not null and not empty
  - hasText
```
public static boolean hasText(@Nullable
                              CharSequence str)
```
    Return whether the given string has non whitespace characters.
    
    Parameters:
    
    str - The string
    
    Returns:
    
    True if str contains any non whitespace characters
  - internListOf
```
public static List<String> internListOf(Object... objects)
```
    Converts the given objects into a set of interned strings contained within an internal pool of sets. See String.intern().
    
    Parameters:
    
    objects - The objects
    
    Returns:
    
    A unmodifiable, pooled set of strings
  - internMapOf
```
public static Map<String,Object> internMapOf(Object... values)
```
    Converts the given objects into a map of interned strings. See String.intern().
    
    Parameters:
    
    values - The objects
    
    Returns:
    
    An unmodifiable set of strings
    
    See Also:
    
    CollectionUtils.mapOf(Object...)
  - isDigits
```
public static boolean isDigits(String str)
```
    Is the given string a series of digits.
    
    Parameters:
    
    str - The string
    
    Returns:
    
    True if it is a series of digits
  - parseLocale
```
@Nullable
public static Locale parseLocale(String localeValue)
```
    Parse the given String value into a Locale, accepting the Locale.toString() format as well as BCP 47 language tags.
    
    Parameters:
    
    localeValue - the locale value: following either Locale's toString() format ("en", "en_UK", etc), also accepting spaces as separators (as an alternative to underscores), or BCP 47 (e.g. "en-UK") as specified by Locale.forLanguageTag(java.lang.String) on Java 7+
    Copied from the Spring Framework while retaining all license, copyright and author information.
    
    Returns:
    
    a corresponding Locale instance, or null if none
    
    Throws:
    
    IllegalArgumentException - in case of an invalid locale specification
    
    Since:
    
    2.3.0
    
    See Also:
    
    Locale.forLanguageTag(java.lang.String)
  - trimLeadingWhitespace
```
public static String trimLeadingWhitespace(String str)
```
    Returns a new string without any leading whitespace.
    
    Parameters:
    
    str - The string
    
    Returns:
    
    The string without leading whitespace
    
    Since:
    
    2.3.0
  - trimLeadingCharacter
```
public static String trimLeadingCharacter(String str,
                                          char c)
```
    Returns a new string without any leading characters that match the supplied character.
    
    Parameters:
    
    str - The string
    
    c - The character to remove
    
    Returns:
    
    The string without leading characters matching the supplied character.
    
    Since:
    
    2.3.0
  - trimLeading
```
public static String trimLeading(String str,
                                 Predicate<Character> predicate)
```
    Returns a new string without any leading characters that match the supplied predicate.
    
    Parameters:
    
    str - The string
    
    predicate - The predicate to test characters against
    
    Returns:
    
    The string without leading characters matching the supplied predicate.
    
    Since:
    
    2.3.0
  - tokenizeToStringArray
```
public static String[] tokenizeToStringArray(String str,
                                             String delimiters)
```
    Tokenize the given String into a String array via a StringTokenizer. Trims tokens and omits empty tokens.
    The given delimiters string is supposed to consist of any number of delimiter characters. Each of those characters can be used to separate tokens. A delimiter is always a single character; for multi-character delimiters, consider using delimitedListToStringArray
    Copied from the Spring Framework while retaining all license, copyright and author information.
    
    Parameters:
    
    str - the String to tokenize
    
    delimiters - the delimiter characters, assembled as String (each of those characters is individually considered as delimiter).
    
    Returns:
    
    an array of the tokens
    
    See Also:
    
    StringTokenizer, String.trim()
  - tokenizeToStringArray
```
public static String[] tokenizeToStringArray(String str,
                                             String delimiters,
                                             boolean trimTokens,
                                             boolean ignoreEmptyTokens)
```
    Tokenize the given String into a String array via a StringTokenizer.
    The given delimiters string is supposed to consist of any number of delimiter characters. Each of those characters can be used to separate tokens. A delimiter is always a single character; for multi-character delimiters, consider using delimitedListToStringArray
    Copied from the Spring Framework while retaining all license, copyright and author information.
    
    Parameters:
    
    str - the String to tokenize
    
    delimiters - the delimiter characters, assembled as String (each of those characters is individually considered as delimiter)
    
    trimTokens - trim the tokens via String's trim
    
    ignoreEmptyTokens - omit empty tokens from the result array (only applies to tokens that are empty after trimming; StringTokenizer will not consider subsequent delimiters as token in the first place).
    
    Returns:
    
    an array of the tokens (null if the input String was null)
    
    See Also:
    
    StringTokenizer, String.trim()
  - convertDotToUnderscore
```
public static String convertDotToUnderscore(String dottedProperty)
```
    Replace the dots in the property with underscore and transform to uppercase.
    
    Parameters:
    
    dottedProperty - The property with dots, example - a.b.c
    
    Returns:
    
    The converted value
  - convertDotToUnderscore
```
public static String convertDotToUnderscore(String dottedProperty,
                                            boolean uppercase)
```
    Replace the dots in the property with underscore and transform to uppercase based on given flag.
    
    Parameters:
    
    dottedProperty - The property with dots, example - a.b.c
    
    uppercase - To transform to uppercase string
    
    Returns:
    
    The converted value
  - prependUri
```
public static String prependUri(String baseUri,
                                String uri)
```
    Prepends a partial uri and normalizes / characters. For example, if the base uri is "/foo/" and the uri is "/bar/", the output will be "/foo/bar/". Similarly if the base uri is "/foo" and the uri is "bar", the output will be "/foo/bar"
    
    Parameters:
    
    baseUri - The uri to prepend. Eg. /foo
    
    uri - The uri to combine with the baseUri. Eg. /bar
    
    Returns:
    
    A combined uri string
  - capitalize
```
public static String capitalize(String str)
```
    Capitalizes the first character of the provided string.
    
    Parameters:
    
    str - The string to capitalize
    
    Returns:
    
    The capitalized string
  - trimToNull
```
@Nullable
public static String trimToNull(@Nullable
                                          String string)
```
    Trims the supplied string. If the string is empty or null before or after trimming, null is returned.
    
    Parameters:
    
    string - the string to trim
    
    Returns:
    
    the trimmed string or null
  - isTrue
```
public static boolean isTrue(String booleanString)
```
    Is the boolean string true. Values that represent true are: yes, y, on, and true.
    
    Parameters:
    
    booleanString - The boolean string
    
    Returns:
    
    True if it is a valid value
  - splitOmitEmptyStrings
```
public static Iterable<String> splitOmitEmptyStrings(CharSequence sequence,
                                                     char splitCharacter)
```
    Fast split by one character iterable. Implementation omits empty strings. This should be a fast alternative to String.split(String) where it's used with one character.
    
    Parameters:
    
    sequence - The sequence to split
    
    splitCharacter - The split character
    
    Returns:
    
    The iterable of possible sequences
    
    Since:
    
    2.5.0
  - splitOmitEmptyStringsList
```
public static List<String> splitOmitEmptyStringsList(CharSequence sequence,
                                                     char splitCharacter)
```
    Fast split by one character iterable. Implementation omits empty strings. This should be a fast alternative to String.split(String) where it's used with one character.
    
    Parameters:
    
    sequence - The sequence to split
    
    splitCharacter - The split character
    
    Returns:
    
    The list of possible sequences
    
    Since:
    
    2.5.0
  - splitOmitEmptyStringsIterator
```
public static Iterator<String> splitOmitEmptyStringsIterator(CharSequence sequence,
                                                             char splitCharacter)
```
    Fast split by one character iterator. Implementation omits empty strings. This should be a fast alternative to String.split(String) where it's used with one character.
    
    Parameters:
    
    sequence - The sequence to split
    
    splitCharacter - The split character
    
    Returns:
    
    The iterator of possible sequences
    
    Since:
    
    2.5.0

Class StringUtils

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

TRUE

FALSE

EMPTY_STRING_ARRAY

EMPTY_STRING

SPACE

Constructor Detail

StringUtils

Method Detail

isEmpty

isNotEmpty

hasText

internListOf

internMapOf

isDigits

parseLocale

trimLeadingWhitespace

trimLeadingCharacter

trimLeading

tokenizeToStringArray

tokenizeToStringArray

convertDotToUnderscore

convertDotToUnderscore

prependUri

capitalize

trimToNull

isTrue

splitOmitEmptyStrings

splitOmitEmptyStringsList

splitOmitEmptyStringsIterator