StringUtils (datavec-api 0.7.2 API)

java.lang.Object
- org.datavec.api.util.StringUtils

```
public class StringUtils
extends Object
```
General string utils

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`StringUtils.TraditionalBinaryPrefix` The traditional binary prefixes, kilo, mega, ..., exa, which can be represented by a 64-bit integer.

Field Summary

Fields
Modifier and Type Field and Description

static char COMMA

static String[] emptyStringArray

static char ESCAPE_CHAR

Fields
Modifier and Type	Field and Description
`static char`	`COMMA`
`static String[]`	`emptyStringArray`
`static char`	`ESCAPE_CHAR`

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`	`arrayToString(String[] strs)` Given an array of strings, return a comma-separated list of its elements.
`static String`	`byteDesc(long len)` Return an abbreviated English-language desc of the byte length
`static String`	`byteToHexString(byte[] bytes)` Same as byteToHexString(bytes, 0, bytes.length).
`static String`	`byteToHexString(byte[] bytes, int start, int end)` Given an array of bytes it will convert the bytes to a hex string representation of the bytes
`static String`	`escapeHTML(String string)` Escapes HTML Special characters present in the string.
`static String`	`escapeString(String str)` Escape commas in the string using the default escape char
`static String`	`escapeString(String str, char escapeChar, char charToEscape)` Escape `charToEscape` in the string with the escape char `escapeChar`
`static String`	`escapeString(String str, char escapeChar, char[] charsToEscape)`
`static int`	`findNext(String str, char separator, char escapeChar, int start, StringBuilder split)` Finds the first occurrence of the separator character ignoring the escaped separators starting from the index.
`static String`	`formatPercent(double done, int digits)` Format a percentage for presentation to the user.
`static String`	`formatTime(long timeDiff)` Given the time in long milliseconds, returns a String in the format Xhrs, Ymins, Z sec.
`static String`	`formatTimeDiff(long finishTime, long startTime)` Given a finish and start time in long milliseconds, returns a String in the format Xhrs, Ymins, Z sec, for the time difference between two times.
`static String`	`getFormattedTimeWithDiff(DateFormat dateFormat, long finishTime, long startTime)` Formats time in ms and appends difference (finishTime - startTime) as returned by formatTimeDiff().
`static String`	`getHostname()` Return hostname without throwing exception.
`static Collection<String>`	`getStringCollection(String str)` Returns a collection of strings.
`static String[]`	`getStrings(String str)` Returns an arraylist of strings.
`static Collection<String>`	`getTrimmedStringCollection(String str)` Splits a comma separated value `String`, trimming leading and trailing whitespace on each value.
`static String[]`	`getTrimmedStrings(String str)` Splits a comma separated value `String`, trimming leading and trailing whitespace on each value.
`static byte[]`	`hexStringToByte(String hex)` Given a hexstring this will return the byte array corresponding to the string
`static String`	`humanReadableInt(long number)` Given an integer, return a string that is in an approximate, but human readable format.
`static String`	`join(CharSequence separator, Iterable<String> strings)` Concatenates strings, using a separator.
`static String`	`joinObjects(CharSequence separator, Iterable<?> objects)` Concatenates stringified objects, using a separator.
`static String`	`limitDecimalTo2(double d)`
`static String`	`simpleHostname(String fullHostname)` Given a full hostname, return the word upto the first dot.
`static String[]`	`split(String str)` Split a string using the default separator
`static String[]`	`split(String str, char escapeChar, char separator)` Split a string using the given separator
`static String`	`stringifyException(Throwable e)` Make a string representation of the exception.
`static URI[]`	`stringToURI(String[] str)`
`static String`	`unEscapeString(String str)` Unescape commas in the string using the default escape char
`static String`	`unEscapeString(String str, char escapeChar, char charToEscape)` Unescape `charToEscape` in the string with the escape char `escapeChar`
`static String`	`unEscapeString(String str, char escapeChar, char[] charsToEscape)`
`static String`	`uriToString(URI[] uris)`

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

- Field Detail
  - emptyStringArray
```
public static final String[] emptyStringArray
```
  - COMMA
```
public static final char COMMA
```
    See Also:
    
    Constant Field Values
  - ESCAPE_CHAR
```
public static final char ESCAPE_CHAR
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - StringUtils
```
public StringUtils()
```
- Method Detail
  - stringifyException
```
public static String stringifyException(Throwable e)
```
    Make a string representation of the exception.
    
    Parameters:
    
    e - The exception to stringify
    
    Returns:
    
    A string with exception name and call stack.
  - simpleHostname
```
public static String simpleHostname(String fullHostname)
```
    Given a full hostname, return the word upto the first dot.
    
    Parameters:
    
    fullHostname - the full hostname
    
    Returns:
    
    the hostname to the first dot
  - humanReadableInt
```
public static String humanReadableInt(long number)
```
    Given an integer, return a string that is in an approximate, but human readable format. It uses the bases 'k', 'm', and 'g' for 1024, 1024**2, and 1024**3.
    
    Parameters:
    
    number - the number to format
    
    Returns:
    
    a human readable form of the integer
  - formatPercent
```
public static String formatPercent(double done,
                                   int digits)
```
    Format a percentage for presentation to the user.
    
    Parameters:
    
    done - the percentage to format (0.0 to 1.0)
    
    digits - the number of digits past the decimal point
    
    Returns:
    
    a string representation of the percentage
  - arrayToString
```
public static String arrayToString(String[] strs)
```
    Given an array of strings, return a comma-separated list of its elements.
    
    Parameters:
    
    strs - Array of strings
    
    Returns:
    
    Empty string if strs.length is 0, comma separated list of strings otherwise
  - byteToHexString
```
public static String byteToHexString(byte[] bytes,
                                     int start,
                                     int end)
```
    Given an array of bytes it will convert the bytes to a hex string representation of the bytes
    
    Parameters:
    
    bytes -
    
    start - start index, inclusively
    
    end - end index, exclusively
    
    Returns:
    
    hex string representation of the byte array
  - byteToHexString
```
public static String byteToHexString(byte[] bytes)
```
    Same as byteToHexString(bytes, 0, bytes.length).
  - hexStringToByte
```
public static byte[] hexStringToByte(String hex)
```
    Given a hexstring this will return the byte array corresponding to the string
    
    Parameters:
    
    hex - the hex String array
    
    Returns:
    
    a byte array that is a hex string representation of the given string. The size of the byte array is therefore hex.length/2
  - uriToString
```
public static String uriToString(URI[] uris)
```
    Parameters:
    
    uris -
  - stringToURI
```
public static URI[] stringToURI(String[] str)
```
    Parameters:
    
    str -
  - formatTimeDiff
```
public static String formatTimeDiff(long finishTime,
                                    long startTime)
```
    Given a finish and start time in long milliseconds, returns a String in the format Xhrs, Ymins, Z sec, for the time difference between two times. If finish time comes before start time then negative valeus of X, Y and Z wil return.
    
    Parameters:
    
    finishTime - finish time
    
    startTime - start time
  - formatTime
```
public static String formatTime(long timeDiff)
```
    Given the time in long milliseconds, returns a String in the format Xhrs, Ymins, Z sec.
    
    Parameters:
    
    timeDiff - The time difference to format
  - getFormattedTimeWithDiff
```
public static String getFormattedTimeWithDiff(DateFormat dateFormat,
                                              long finishTime,
                                              long startTime)
```
    Formats time in ms and appends difference (finishTime - startTime) as returned by formatTimeDiff(). If finish time is 0, empty string is returned, if start time is 0 then difference is not appended to return value.
    
    Parameters:
    
    dateFormat - date format to use
    
    finishTime - fnish time
    
    startTime - start time
    
    Returns:
    
    formatted value.
  - getStrings
```
public static String[] getStrings(String str)
```
    Returns an arraylist of strings.
    
    Parameters:
    
    str - the comma seperated string values
    
    Returns:
    
    the arraylist of the comma seperated string values
  - getStringCollection
```
public static Collection<String> getStringCollection(String str)
```
    Returns a collection of strings.
    
    Parameters:
    
    str - comma seperated string values
    
    Returns:
    
    an ArrayList of string values
  - getTrimmedStringCollection
```
public static Collection<String> getTrimmedStringCollection(String str)
```
    Splits a comma separated value String, trimming leading and trailing whitespace on each value.
    
    Parameters:
    
    str - a comma separated with values
    
    Returns:
    
    a Collection of String values
  - getTrimmedStrings
```
public static String[] getTrimmedStrings(String str)
```
    Splits a comma separated value String, trimming leading and trailing whitespace on each value.
    
    Parameters:
    
    str - a comma separated with values
    
    Returns:
    
    an array of String values
  - split
```
public static String[] split(String str)
```
    Split a string using the default separator
    
    Parameters:
    
    str - a string that may have escaped separator
    
    Returns:
    
    an array of strings
  - split
```
public static String[] split(String str,
                             char escapeChar,
                             char separator)
```
    Split a string using the given separator
    
    Parameters:
    
    str - a string that may have escaped separator
    
    escapeChar - a char that be used to escape the separator
    
    separator - a separator char
    
    Returns:
    
    an array of strings
  - findNext
```
public static int findNext(String str,
                           char separator,
                           char escapeChar,
                           int start,
                           StringBuilder split)
```
    Finds the first occurrence of the separator character ignoring the escaped separators starting from the index. Note the substring between the index and the position of the separator is passed.
    
    Parameters:
    
    str - the source string
    
    separator - the character to find
    
    escapeChar - character used to escape
    
    start - from where to search
    
    split - used to pass back the extracted string
  - escapeString
```
public static String escapeString(String str)
```
    Escape commas in the string using the default escape char
    
    Parameters:
    
    str - a string
    
    Returns:
    
    an escaped string
  - escapeString
```
public static String escapeString(String str,
                                  char escapeChar,
                                  char charToEscape)
```
    Escape charToEscape in the string with the escape char escapeChar
    
    Parameters:
    
    str - string
    
    escapeChar - escape char
    
    charToEscape - the char to be escaped
    
    Returns:
    
    an escaped string
  - escapeString
```
public static String escapeString(String str,
                                  char escapeChar,
                                  char[] charsToEscape)
```
    Parameters:
    
    charsToEscape - array of characters to be escaped
  - unEscapeString
```
public static String unEscapeString(String str)
```
    Unescape commas in the string using the default escape char
    
    Parameters:
    
    str - a string
    
    Returns:
    
    an unescaped string
  - unEscapeString
```
public static String unEscapeString(String str,
                                    char escapeChar,
                                    char charToEscape)
```
    Unescape charToEscape in the string with the escape char escapeChar
    
    Parameters:
    
    str - string
    
    escapeChar - escape char
    
    charToEscape - the escaped char
    
    Returns:
    
    an unescaped string
  - unEscapeString
```
public static String unEscapeString(String str,
                                    char escapeChar,
                                    char[] charsToEscape)
```
    Parameters:
    
    charsToEscape - array of characters to unescape
  - getHostname
```
public static String getHostname()
```
    Return hostname without throwing exception.
    
    Returns:
    
    hostname
  - escapeHTML
```
public static String escapeHTML(String string)
```
    Escapes HTML Special characters present in the string.
    
    Parameters:
    
    string -
    
    Returns:
    
    HTML Escaped String representation
  - byteDesc
```
public static String byteDesc(long len)
```
    Return an abbreviated English-language desc of the byte length
  - limitDecimalTo2
```
public static String limitDecimalTo2(double d)
```
  - join
```
public static String join(CharSequence separator,
                          Iterable<String> strings)
```
    Concatenates strings, using a separator.
    
    Parameters:
    
    separator - Separator to join with.
    
    strings - Strings to join.
  - joinObjects
```
public static String joinObjects(CharSequence separator,
                                 Iterable<?> objects)
```
    Concatenates stringified objects, using a separator.
    
    Parameters:
    
    separator - Separator to join with.
    
    objects - Objects to join.

Class StringUtils

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

emptyStringArray

COMMA

ESCAPE_CHAR

Constructor Detail

StringUtils

Method Detail

stringifyException

simpleHostname

humanReadableInt

formatPercent

arrayToString

byteToHexString

byteToHexString

hexStringToByte

uriToString

stringToURI

formatTimeDiff

formatTime

getFormattedTimeWithDiff

getStrings

getStringCollection

getTrimmedStringCollection

getTrimmedStrings

split

split

findNext

escapeString

escapeString

escapeString

unEscapeString

unEscapeString

unEscapeString

getHostname

escapeHTML

byteDesc

limitDecimalTo2

join

joinObjects