org.apache.hadoop.util

Class StringUtils

java.lang.Object

org.apache.hadoop.util.StringUtils

public class StringUtils
extends Object

General string utils

Author:

Owen O'Malley

Constructor Summary

Constructors

Constructor and Description
StringUtils()

Method Summary

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	byteToHexString(byte[] bytes) Given an array of bytes it will convert the bytes to a hex string representation of the bytes
static String	formatPercent(double done, int digits) Format a percentage for presentation to the user.
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[]	getStrings(String str) returns an arraylist of strings
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	simpleHostname(String fullHostname) Given a full hostname, return the word upto the first dot.
static String	stringifyException(Throwable e) Make a string representation of the exception.
static Path[]	stringToPath(String[] str)
static URI[]	stringToURI(String[] str)
static String	uriToString(URI[] uris)

Methods inherited from class java.lang.Object

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

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)

Given an array of bytes it will convert the bytes to a hex string representation of the bytes

Parameters:

bytes -

Returns:

hex string representation of the byte array

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 -

stringToPath

public static Path[] stringToPath(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

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