public class StringUtil extends Object
Modifier and Type | Field and Description |
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static String |
EMPTY_STRING
Returns
Object.toString() of the provided value if it isn't null; "" otherwise. |
Constructor and Description |
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StringUtil() |
Modifier and Type | Method and Description |
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static String |
asEmptyIfNull(Object string) |
static String |
assertCharactersNotInString(String illegalChars,
char... chars)
Checks that a String doesn't contain one or more characters of interest.
|
static String |
bytesToHexString(byte[] data)
Convert a byte array into a String hex representation.
|
static String |
bytesToString(byte[] data) |
static String |
bytesToString(byte[] buffer,
int offset,
int length) |
static char |
byteToChar(byte b)
Convert ASCII byte to ASCII char.
|
static void |
charsToBytes(char[] chars,
int charOffset,
int length,
byte[] bytes,
int byteOffset)
Convert chars to bytes merely by casting
|
static byte |
charToByte(char c)
Convert ASCII char to byte.
|
static int |
fromHexDigit(char c) |
static byte[] |
hexStringToBytes(String s)
Convert a String containing hex characters into an array of bytes with the binary representation
of the hex string
|
static String |
intValuesToString(int[] intVals) |
static String |
intValuesToString(short[] shortVals) |
static boolean |
isBlank(String str)
Checks if a String is whitespace, empty ("") or null.
|
static <T> String |
join(String separator,
Collection<T> objs) |
static <T> String |
join(String separator,
T... objs) |
static int |
levenshteinDistance(String string1,
String string2,
int swap,
int substitution,
int insertion,
int deletion) |
static String |
readNullTerminatedString(BinaryCodec binaryCodec) |
static String |
repeatCharNTimes(char c,
int repeatNumber) |
static String |
reverseString(String s)
Reverse the given string.
|
static int |
split(String aString,
String[] tokens,
char delim)
Split the string into tokens separated by the given delimiter.
|
static int |
splitConcatenateExcessTokens(String aString,
String[] tokens,
char delim)
Split the string into tokens separated by the given delimiter.
|
static byte[] |
stringToBytes(String s) |
static byte[] |
stringToBytes(String s,
int offset,
int length) |
static char |
toHexDigit(int value) |
static byte |
toLowerCase(byte b) |
static byte |
toUpperCase(byte b) |
static void |
toUpperCase(byte[] bytes)
Converts in place all lower case letters to upper case in the byte array provided.
|
static String |
wordWrap(String s,
int maxLineLength)
Return input string with newlines inserted to ensure that all lines
have length <= maxLineLength.
|
static String |
wordWrapSingleLine(String s,
int maxLineLength) |
public static final String EMPTY_STRING
Object.toString()
of the provided value if it isn't null; "" otherwise.public static <T> String join(String separator, Collection<T> objs)
separator
- String to interject between each string in strings argobjs
- List of objs to be joinedpublic static int split(String aString, String[] tokens, char delim)
aString
- the string to splittokens
- an array to hold the parsed tokensdelim
- character that delimits tokenspublic static int splitConcatenateExcessTokens(String aString, String[] tokens, char delim)
aString
- the string to splittokens
- an array to hold the parsed tokensdelim
- character that delimits tokenspublic static byte toLowerCase(byte b)
b
- ASCII characterpublic static byte toUpperCase(byte b)
b
- ASCII characterpublic static void toUpperCase(byte[] bytes)
public static String assertCharactersNotInString(String illegalChars, char... chars)
illegalChars
- the String to checkchars
- the characters to check forIllegalArgumentException
- if the String contains one or more of the characterspublic static String wordWrap(String s, int maxLineLength)
public static String intValuesToString(int[] intVals)
public static String intValuesToString(short[] shortVals)
public static String bytesToString(byte[] data)
public static String bytesToString(byte[] buffer, int offset, int length)
public static byte[] stringToBytes(String s)
public static byte[] stringToBytes(String s, int offset, int length)
public static String readNullTerminatedString(BinaryCodec binaryCodec)
public static void charsToBytes(char[] chars, int charOffset, int length, byte[] bytes, int byteOffset)
chars
- input charscharOffset
- where to start converting from chars arraylength
- how many chars to convertbytes
- where to put the converted outputbyteOffset
- where to start writing the converted output.public static byte charToByte(char c)
public static char byteToChar(byte b)
public static String bytesToHexString(byte[] data)
data
- Input to be converted.public static byte[] hexStringToBytes(String s) throws NumberFormatException
s
- Hex string. Length must be even because each pair of hex chars is converted into a byte.NumberFormatException
public static char toHexDigit(int value)
public static int fromHexDigit(char c) throws NumberFormatException
NumberFormatException
public static String reverseString(String s)
s
- String to be reversed.public static boolean isBlank(String str)
Checks if a String is whitespace, empty ("") or null.
StringUtils.isBlank(null) = true StringUtils.isBlank("") = true StringUtils.isBlank(" ") = true StringUtils.isBlank("sam") = false StringUtils.isBlank(" sam ") = false
str
- the String to check, may be nulltrue
if the String is null, empty or whitespacepublic static String repeatCharNTimes(char c, int repeatNumber)