edu.umass.cs.utils

Class Util

java.lang.Object

edu.umass.cs.utils.Util

public class Util
extends java.lang.Object

Author:

arun Various generic static utility methods.

Field Summary

Fields

Modifier and Type	Field and Description
static double	ALPHA
static java.text.DecimalFormat	decimalFormat

Constructor Summary

Constructors

Constructor and Description
Util()

Method Summary

Modifier and Type	Method and Description
static java.lang.String	arrayOfIntToString(int[] array)
static java.util.Set<java.lang.String>	arrayOfIntToStringSet(int[] array)
static java.util.Set<java.lang.String>	arrayOfObjectsToStringSet(java.lang.Object[] array)
static java.util.Set<java.lang.Integer>	arrayToIntSet(int[] array)
static void	assertAssertionsEnabled()
void	assertEnabled()
static long	bytesToLong(byte[] bytes)
static boolean	contains(int member, int[] array)
static java.lang.String	df(double d)
static java.util.Set<java.lang.Object>	diff(java.util.Set<?> s1, java.util.Set<?> s2)
static long	encodedStringToLong(java.lang.String str)
static int[]	filter(int[] array, int member)
static byte[]	getAlphanumericAsBytes()
static java.lang.String	getCommaSeparated(java.util.List<?> list)
static java.net.InetAddress	getInetAddressFromString(java.lang.String s)
static java.net.InetSocketAddress	getInetSocketAddressFromString(java.lang.String s)
static java.net.InetSocketAddress	getInetSocketAddressFromStringStrict(java.lang.String s)
static org.json.JSONArray	getJSONArray(java.util.Set<java.net.InetSocketAddress> addresses)
static java.io.File[]	getMatchingFiles(java.lang.String dir, java.lang.String... match)
static java.lang.String[]	getNames(org.json.JSONObject jo) Get an array of field names from a JSONObject.
static java.net.InetSocketAddress	getOffsettedAddress(java.net.InetSocketAddress isa, int offset)
static java.util.Set<?>	getOtherThan(java.util.Set<?> set, java.lang.Object exclude)
static java.lang.Object	getOtherThanString(java.util.Set<?> set, java.lang.Object exclude)
static byte[]	getRandomAlphanumericBytes()
static byte[]	getRandomAlphanumericBytes(int size)
static java.lang.Object	getRandomOtherThan(java.util.Set<?> all, java.lang.Object exclude)
static java.lang.Object	getRandomOtherThan(java.util.Set<?> all, java.util.Set<?> exclude)
static java.util.Set<java.net.InetSocketAddress>	getSocketAddresses(org.json.JSONArray jarray)
static java.lang.Integer[]	intToIntegerArray(int[] array)
static boolean	isWrapperType(java.lang.Class<?> clazz)
static java.util.ArrayList<java.lang.Integer>	JSONArrayToArrayListInteger(org.json.JSONArray jsonArray)
static java.util.List<?>	JSONArrayToList(org.json.JSONArray jsonArray)
static java.util.Map<java.lang.String,?>	JSONObjectToMap(org.json.JSONObject json)
static java.lang.String[]	jsonToStringArray(java.lang.String jsonString)
static byte[]	longToBytes(long value)
static java.lang.String	longToEncodedString(long value)
static void	main(java.lang.String[] args)
static double	movingAverage(double sample, double historicalAverage)
static double	movingAverage(double sample, double historicalAverage, double alpha)
static double	movingAverage(long sample, double historicalAverage)
static double	movingAverage(long sample, double historicalAverage, double alpha)
static java.lang.String	ms(double d)
static java.lang.String	mu(double d)
static java.lang.String	nmu(double d)
static java.net.InetSocketAddress	offsetPort(java.net.InetSocketAddress isa, int offset)
static boolean	oneIn(int n)
static java.lang.String	prefix(java.lang.String str, int prefixLength)
static java.lang.Object	printThisLine()
static java.lang.Object	printThisLine(java.lang.Boolean log)
static java.nio.ByteBuffer	put(java.nio.ByteBuffer dst, java.nio.ByteBuffer src)
static java.nio.ByteBuffer	put(java.nio.ByteBuffer dst, java.nio.ByteBuffer src, int transferLimit) Transfer from src to dst without throwing exception if src.remaining() > dst.remaining() but copying dst.remaining() bytes from src instead.
static java.util.ArrayList<java.lang.String>	recursiveFind(java.lang.String dir, java.lang.String regex)
static boolean	recursiveRemove(java.io.File file)
static boolean	recursiveRemove(java.lang.String dir, java.lang.String... match)
static java.util.Set<?>	removeFromSet(java.util.Set<?> set, java.lang.Object element)
static java.util.Set<?>	removeFromSetCopy(java.util.Set<?> set, java.lang.Object element)
static int	roundToInt(double d)
static java.lang.Object	selectRandom(java.util.Collection<?> set)
static int[]	setToIntArray(java.util.Set<java.lang.Integer> set)
static java.lang.Integer[]	setToIntegerArray(java.util.Set<java.lang.Integer> set)
static java.lang.Object[]	setToNodeIdArray(java.util.Set<?> set)
static java.util.Set<java.lang.String>	setToStringSet(java.util.Set<?> set)
static java.util.Set<java.net.InetAddress>	socketAddressesToInetAddresses(java.net.InetSocketAddress[] sockAddrs)
static <K,V extends java.lang.Comparable<? super V>> java.util.Map<K,V>	sortByValue(java.util.Map<K,V> map) Sorts a map by value.
static java.util.Set<java.lang.Integer>	stringSetToIntegerSet(java.util.Set<java.lang.String> set)
static int[]	stringToIntArray(java.lang.String string)
static java.util.Set<java.lang.String>	stringToStringSet(java.lang.String string)
static java.lang.Object	suicide(java.util.logging.Logger logger, java.lang.String error)
static java.lang.Object	suicide(java.lang.String error)
static java.util.Set<java.lang.Integer>	toIntSet(int i)
static org.json.JSONObject	toJSONObject(java.lang.String s)
static java.lang.String	toJSONString(java.util.Collection<?> collection)
static java.lang.String	toJSONString(int[] array)
static long	toLong(java.lang.Object obj)
static java.lang.String	toString(java.net.InetSocketAddress entryServer)
static java.lang.Object	truncate(java.lang.Object obj, int size)
static java.lang.Object	truncate(java.lang.Object obj, int prefixSize, int suffixSize)
static java.lang.Object	truncatedLog(java.util.Collection<?> list, int size)
static org.json.JSONObject	viaJSONSmart(net.minidev.json.JSONObject jsonS)
static void	wipeoutFile(java.lang.String filename)

Methods inherited from class java.lang.Object

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

Field Detail

decimalFormat

public static final java.text.DecimalFormat decimalFormat

ALPHA

public static final double ALPHA

See Also:

Constant Field Values

Constructor Detail

Util

public Util()

Method Detail

df

public static final java.lang.String df(double d)

ms

public static final java.lang.String ms(double d)

mu

public static final java.lang.String mu(double d)

nmu

public static final java.lang.String nmu(double d)

movingAverage

public static final double movingAverage(double sample,
                                         double historicalAverage,
                                         double alpha)

movingAverage

public static final double movingAverage(double sample,
                                         double historicalAverage)

movingAverage

public static final double movingAverage(long sample,
                                         double historicalAverage)

movingAverage

public static final double movingAverage(long sample,
                                         double historicalAverage,
                                         double alpha)

oneIn

public static boolean oneIn(int n)

roundToInt

public static int roundToInt(double d)

assertAssertionsEnabled

public static void assertAssertionsEnabled()

prefix

public static java.lang.String prefix(java.lang.String str,
                                      int prefixLength)

arrayToIntSet

public static java.util.Set<java.lang.Integer> arrayToIntSet(int[] array)

filter

public static int[] filter(int[] array,
                           int member)

setToStringSet

public static java.util.Set<java.lang.String> setToStringSet(java.util.Set<?> set)

stringSetToIntegerSet

public static java.util.Set<java.lang.Integer> stringSetToIntegerSet(java.util.Set<java.lang.String> set)

setToIntArray

public static int[] setToIntArray(java.util.Set<java.lang.Integer> set)

setToNodeIdArray

public static java.lang.Object[] setToNodeIdArray(java.util.Set<?> set)

setToIntegerArray

public static java.lang.Integer[] setToIntegerArray(java.util.Set<java.lang.Integer> set)

stringToIntArray

public static int[] stringToIntArray(java.lang.String string)

stringToStringSet

public static java.util.Set<java.lang.String> stringToStringSet(java.lang.String string)
                                                         throws org.json.JSONException

Throws:

org.json.JSONException

toJSONObject

public static org.json.JSONObject toJSONObject(java.lang.String s)
                                        throws org.json.JSONException

Throws:

org.json.JSONException

intToIntegerArray

public static java.lang.Integer[] intToIntegerArray(int[] array)

arrayOfIntToStringSet

public static java.util.Set<java.lang.String> arrayOfIntToStringSet(int[] array)

arrayOfIntToString

public static java.lang.String arrayOfIntToString(int[] array)

contains

public static boolean contains(int member,
                               int[] array)

arrayOfObjectsToStringSet

public static java.util.Set<java.lang.String> arrayOfObjectsToStringSet(java.lang.Object[] array)

selectRandom

public static java.lang.Object selectRandom(java.util.Collection<?> set)

getInetSocketAddressFromString

public static java.net.InetSocketAddress getInetSocketAddressFromString(java.lang.String s)

getInetSocketAddressFromStringStrict

public static java.net.InetSocketAddress getInetSocketAddressFromStringStrict(java.lang.String s)

getInetAddressFromString

public static java.net.InetAddress getInetAddressFromString(java.lang.String s)
                                                     throws java.net.UnknownHostException

Throws:

java.net.UnknownHostException

toJSONString

public static java.lang.String toJSONString(java.util.Collection<?> collection)

jsonToStringArray

public static java.lang.String[] jsonToStringArray(java.lang.String jsonString)
                                            throws org.json.JSONException

Throws:

org.json.JSONException

toJSONString

public static java.lang.String toJSONString(int[] array)

JSONArrayToArrayListInteger

public static java.util.ArrayList<java.lang.Integer> JSONArrayToArrayListInteger(org.json.JSONArray jsonArray)
                                                                          throws org.json.JSONException

Throws:

org.json.JSONException

assertEnabled

public void assertEnabled()

truncate

public static java.lang.Object truncate(java.lang.Object obj,
                                        int size)

truncate

public static java.lang.Object truncate(java.lang.Object obj,
                                        int prefixSize,
                                        int suffixSize)

getAlphanumericAsBytes

public static byte[] getAlphanumericAsBytes()

getRandomAlphanumericBytes

public static byte[] getRandomAlphanumericBytes()

getRandomAlphanumericBytes

public static byte[] getRandomAlphanumericBytes(int size)

truncatedLog

public static java.lang.Object truncatedLog(java.util.Collection<?> list,
                                            int size)

suicide

public static java.lang.Object suicide(java.util.logging.Logger logger,
                                       java.lang.String error)

suicide

public static java.lang.Object suicide(java.lang.String error)

getCommaSeparated

public static java.lang.String getCommaSeparated(java.util.List<?> list)

put

public static java.nio.ByteBuffer put(java.nio.ByteBuffer dst,
                                      java.nio.ByteBuffer src,
                                      int transferLimit)

Transfer from src to dst without throwing exception if src.remaining() > dst.remaining() but copying dst.remaining() bytes from src instead. transferLimit further limits the number of bytes transferred from src to dst.

put

public static java.nio.ByteBuffer put(java.nio.ByteBuffer dst,
                                      java.nio.ByteBuffer src)

longToBytes

public static byte[] longToBytes(long value)

longToEncodedString

public static java.lang.String longToEncodedString(long value)
                                            throws java.io.UnsupportedEncodingException

Throws:

java.io.UnsupportedEncodingException

bytesToLong

public static long bytesToLong(byte[] bytes)

encodedStringToLong

public static long encodedStringToLong(java.lang.String str)
                                throws java.io.UnsupportedEncodingException

Throws:

java.io.UnsupportedEncodingException

toLong

public static long toLong(java.lang.Object obj)

toIntSet

public static java.util.Set<java.lang.Integer> toIntSet(int i)

getRandomOtherThan

public static java.lang.Object getRandomOtherThan(java.util.Set<?> all,
                                                  java.util.Set<?> exclude)

getRandomOtherThan

public static java.lang.Object getRandomOtherThan(java.util.Set<?> all,
                                                  java.lang.Object exclude)

getOtherThan

public static java.util.Set<?> getOtherThan(java.util.Set<?> set,
                                            java.lang.Object exclude)

getOtherThanString

public static java.lang.Object getOtherThanString(java.util.Set<?> set,
                                                  java.lang.Object exclude)

isWrapperType

public static boolean isWrapperType(java.lang.Class<?> clazz)

viaJSONSmart

public static org.json.JSONObject viaJSONSmart(net.minidev.json.JSONObject jsonS)
                                        throws org.json.JSONException

Throws:

org.json.JSONException

offsetPort

public static java.net.InetSocketAddress offsetPort(java.net.InetSocketAddress isa,
                                                    int offset)

removeFromSetCopy

public static java.util.Set<?> removeFromSetCopy(java.util.Set<?> set,
                                                 java.lang.Object element)

removeFromSet

public static java.util.Set<?> removeFromSet(java.util.Set<?> set,
                                             java.lang.Object element)

diff

public static java.util.Set<java.lang.Object> diff(java.util.Set<?> s1,
                                                   java.util.Set<?> s2)

main

public static void main(java.lang.String[] args)
                 throws java.io.UnsupportedEncodingException,
                        java.net.UnknownHostException

Throws:

java.io.UnsupportedEncodingException

java.net.UnknownHostException

recursiveRemove

public static boolean recursiveRemove(java.io.File file)

getMatchingFiles

public static java.io.File[] getMatchingFiles(java.lang.String dir,
                                              java.lang.String... match)

Parameters:

dir -

match -

Returns:

Files (recursively) within dir matching any of the match patterns in match.

recursiveRemove

public static boolean recursiveRemove(java.lang.String dir,
                                      java.lang.String... match)

recursiveFind

public static java.util.ArrayList<java.lang.String> recursiveFind(java.lang.String dir,
                                                                  java.lang.String regex)

wipeoutFile

public static void wipeoutFile(java.lang.String filename)
                        throws java.io.IOException

Throws:

java.io.IOException

socketAddressesToInetAddresses

public static java.util.Set<java.net.InetAddress> socketAddressesToInetAddresses(java.net.InetSocketAddress[] sockAddrs)

printThisLine

public static java.lang.Object printThisLine()

printThisLine

public static java.lang.Object printThisLine(java.lang.Boolean log)

sortByValue

public static <K,V extends java.lang.Comparable<? super V>> java.util.Map<K,V> sortByValue(java.util.Map<K,V> map)

Sorts a map by value.

Type Parameters:

K -

V -

Parameters:

map -

Returns:

the sorted map

getSocketAddresses

public static java.util.Set<java.net.InetSocketAddress> getSocketAddresses(org.json.JSONArray jarray)
                                                                    throws org.json.JSONException

Throws:

org.json.JSONException

getJSONArray

public static org.json.JSONArray getJSONArray(java.util.Set<java.net.InetSocketAddress> addresses)
                                       throws org.json.JSONException

Throws:

org.json.JSONException

toString

public static java.lang.String toString(java.net.InetSocketAddress entryServer)

Parameters:

entryServer -

Returns:

Returns a canonical string form that can be easily converted back to the original socket address.

JSONArrayToList

public static java.util.List<?> JSONArrayToList(org.json.JSONArray jsonArray)
                                         throws org.json.JSONException

Throws:

org.json.JSONException

getNames

public static java.lang.String[] getNames(org.json.JSONObject jo)

Get an array of field names from a JSONObject. COPIED from org.json - Android's moving this method to util to preserve Android and iOS compatibility.

Returns:

An array of field names, or null if there are no names.

JSONObjectToMap

public static java.util.Map<java.lang.String,?> JSONObjectToMap(org.json.JSONObject json)
                                                         throws org.json.JSONException

Throws:

org.json.JSONException

getOffsettedAddress

public static java.net.InetSocketAddress getOffsettedAddress(java.net.InetSocketAddress isa,
                                                             int offset)