in.yajnesh.util.java

Class JUtil

java.lang.Object

in.yajnesh.util.java.JUtil

public class JUtil
extends java.lang.Object

Collection of common java util methods

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	EMPTY_STRING Empty string, literally ""

Constructor Summary

Constructors

Constructor and Description
JUtil()

Method Summary

Modifier and Type	Method and Description
static boolean	contains(java.lang.String source, java.lang.String searchTerm) Does source has searchTerm in it?
static boolean	containsIgnoreCase(java.lang.String source, java.lang.String searchTerm) Does source has searchTerm in it ignoring case?
static java.util.Map<java.lang.String,java.lang.String>	emptyMapMutable() Get empty mutable hashMap
static java.util.Set<java.lang.String>	emptySetMutable() Get empty mutable hashSet
static boolean	equals(java.lang.Object a, java.lang.Object b) Are two strings equal?
static boolean	equalsRelaxed(java.lang.Object a, java.lang.Object b) Are two strings equal ignoring case?
static java.lang.Character	get(java.lang.CharSequence cs, int index) Safely get a character from CharSequence
static java.lang.Character	get(java.lang.CharSequence cs, int index, java.lang.Character defaultValue) Safely get a character from CharSequence
static <T> T	get(java.util.List<T> list, int index) Safely get an item from list
static <T> T	get(java.util.List<T> list, int index, T defaultValue) Safely get an item from list
static java.lang.Character	get(java.lang.String s, int index) Safely get a character from String
static java.lang.Character	get(java.lang.String s, int index, java.lang.Character defaultValue) Safely get a character from String
static <T> T	get(T[] array, int index) Safely get an item from array
static <T> T	get(T[] array, int index, T defaultValue) Safely get an item from array
static java.lang.Character	getLastItem(java.lang.CharSequence cs) Safely get last item from charSequence
static java.lang.Character	getLastItem(java.lang.CharSequence cs, java.lang.Character defaultValue) Safely get last item from charSequence
static <T> T	getLastItem(java.util.List<T> list) Safely get last item from list
static <T> T	getLastItem(java.util.List<T> list, T defaultValue) Safely get an item from list
static java.lang.Character	getLastItem(java.lang.String s) Safely get last item from string
static java.lang.Character	getLastItem(java.lang.String s, java.lang.Character defaultValue) Safely get last item from string
static <T> T	getLastItem(T[] array) Safely get last item from array
static <T> T	getLastItem(T[] array, T defaultValue) Safely get an item from array
static java.lang.String	getString(java.lang.Object o) Get string from an object
static java.lang.String	getStringSafe(java.lang.Object o) Get string from an object
static boolean	isAllEmpty(java.lang.Object... objects) Are all the object passed is null or empty.
static boolean	isAnyEmpty(java.lang.Object... objects) Is any object passed is null or empty.
static boolean	isEmpty(java.lang.CharSequence cs) Is the CharSequence null or empty?
static <T> boolean	isEmpty(java.util.Collection<T> collection) Is the Collection null or empty?
static <K,V> boolean	isEmpty(java.util.Map<K,V> m) Is the Map null or empty?
static boolean	isEmpty(java.lang.String s) Is the String null or empty?
static <T> boolean	isEmpty(T[] array) Is the array null or empty?
static java.lang.String	safeUrlEncode(java.lang.String s, java.lang.String enc) Safe url encode.
static int	size(java.lang.CharSequence cs) Get the size of the charSequence
static <T> int	size(java.util.Collection<T> collection) Get the size of the collection
static int	size(java.lang.String s) Get the size of the string
static <T> int	size(T[] array) Get the size of the array
static java.lang.String	stringify(java.util.Collection collection) Get string out of Collection
static java.lang.String	stringify(java.util.Map map) Get string out of Map
static java.lang.String	stringify(java.lang.String message, java.util.Collection collection) Get string out of Collection
static java.lang.String	stringify(java.lang.String message, java.util.Map map) Get string out of Map
static <T> T	typeCast(java.lang.Object o, java.lang.Class<T> clazz) Integer i=typeCast(object,Integer.class);

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_STRING

public static final java.lang.String EMPTY_STRING

Empty string, literally ""

See Also:

Constant Field Values

Constructor Detail

JUtil

public JUtil()

Method Detail

get

public static <T> T get(T[] array,
                        int index)

Safely get an item from array

same as calling get(array,index,null)

Parameters:

array - The array

index - the index at which the item needs to be fetched

Returns:

item if found, null otherwise

See Also:

get(array,index,defaultValue)

get

public static <T> T get(T[] array,
                        int index,
                        T defaultValue)

Safely get an item from array

Parameters:

array - The array

index - the index at which the item needs to be fetched

defaultValue - in case of array is null or index out of bound, return this value

Returns:

item if found, defaultValue otherwise

See Also:

get(array,index)

get

public static <T> T get(java.util.List<T> list,
                        int index)

Safely get an item from list

same as calling get(list,index,null)

Parameters:

list - The list

index - the index at which the item needs to be fetched

Returns:

item if found, null otherwise

See Also:

get(list,index,defaultValue)

get

public static <T> T get(java.util.List<T> list,
                        int index,
                        T defaultValue)

Safely get an item from list

Parameters:

list - The list

index - the index at which the item needs to be fetched

defaultValue - in case of array is null or index out of bound, return this value

Returns:

item if found, defaultValue otherwise

See Also:

get(list,index)

get

public static java.lang.Character get(java.lang.String s,
                                      int index)

Safely get a character from String

same as calling get(string,index,null)

Parameters:

s - The String

index - the index at which the character needs to be fetched

Returns:

item if found, null otherwise

See Also:

get(string,index,defaultValue)

get

public static java.lang.Character get(java.lang.String s,
                                      int index,
                                      java.lang.Character defaultValue)

Safely get a character from String

Parameters:

s - The String

index - the index at which the character needs to be fetched

defaultValue - in case of string is null or index out of bound, return this value

Returns:

item if found, defaultValue otherwise

See Also:

get(string,index)

get

public static java.lang.Character get(java.lang.CharSequence cs,
                                      int index)

Safely get a character from CharSequence

same as calling get(charsequence,index,null)

Parameters:

cs - The CharSequence

index - the index at which the character needs to be fetched

Returns:

item if found, null otherwise

See Also:

get(charsequence,index,defaultValue)

get

public static java.lang.Character get(java.lang.CharSequence cs,
                                      int index,
                                      java.lang.Character defaultValue)

Safely get a character from CharSequence

Parameters:

cs - The CharSequence

index - the index at which the character needs to be fetched

defaultValue - in case of charSequence is null or index out of bound, return this value

Returns:

item if found, defaultValue otherwise

See Also:

get(charsequence,index)

getLastItem

public static <T> T getLastItem(T[] array)

Safely get last item from array

same as calling getLastItem(array,null)

Parameters:

array - The array

Returns:

item if found, null otherwise

See Also:

getLastItem(array,defaultValue)

getLastItem

public static <T> T getLastItem(T[] array,
                                T defaultValue)

Safely get an item from array

Parameters:

array - The array

defaultValue - in case of array is null or empty, return this value

Returns:

item if found, defaultValue otherwise

See Also:

getLastItem(array)

getLastItem

public static <T> T getLastItem(java.util.List<T> list)

Safely get last item from list

same as calling getLastItem(list,null)

Parameters:

list - The list

Returns:

item if found, null otherwise

See Also:

getLastItem(list,defaultValue)

getLastItem

public static <T> T getLastItem(java.util.List<T> list,
                                T defaultValue)

Safely get an item from list

Parameters:

list - The list

defaultValue - in case of list is null or empty, return this value

Returns:

item if found, defaultValue otherwise

See Also:

getLastItem(list)

getLastItem

public static java.lang.Character getLastItem(java.lang.String s)

Safely get last item from string

same as calling getLastItem(string,null)

Parameters:

s - The String

Returns:

item if found, null otherwise

See Also:

getLastItem(string,defaultValue)

getLastItem

public static java.lang.Character getLastItem(java.lang.String s,
                                              java.lang.Character defaultValue)

Safely get last item from string

Parameters:

s - The String

defaultValue - in case of string is null or empty, return this value

Returns:

item if found, defaultValue otherwise

See Also:

getLastItem(string)

getLastItem

public static java.lang.Character getLastItem(java.lang.CharSequence cs)

Safely get last item from charSequence

same as calling getLastItem(charSequence,null)

Parameters:

cs - The CharSequence

Returns:

item if found, null otherwise

See Also:

getLastItem(charSequence,defaultValue)

getLastItem

public static java.lang.Character getLastItem(java.lang.CharSequence cs,
                                              java.lang.Character defaultValue)

Safely get last item from charSequence

Parameters:

cs - The CharSequence

defaultValue - in case of charSequence is null or empty, return this value

Returns:

item if found, null otherwise

See Also:

getLastItem(charSequence,defaultValue)

isEmpty

public static <T> boolean isEmpty(T[] array)

Is the array null or empty?

Parameters:

array - The array

Returns:

true if the array is null or empty

See Also:

isEmpty(Collection), isEmpty(String), isEmpty(CharSequence), isEmpty(Map)

isEmpty

public static <T> boolean isEmpty(java.util.Collection<T> collection)

Is the Collection null or empty?

Parameters:

collection - The collection

Returns:

true if the collection is null or empty

See Also:

isEmpty(Object[]), isEmpty(String), isEmpty(CharSequence), isEmpty(Map)

isEmpty

public static boolean isEmpty(java.lang.String s)

Is the String null or empty?

Parameters:

s - The string

Returns:

true if the string is null or empty

See Also:

isEmpty(Collection), isEmpty(Object[]), isEmpty(CharSequence), isEmpty(Map)

isEmpty

public static boolean isEmpty(java.lang.CharSequence cs)

Is the CharSequence null or empty?

Parameters:

cs - The CharSequence

Returns:

true if the string is null or empty

See Also:

isEmpty(Collection), isEmpty(Object[]), isEmpty(String), isEmpty(Map)

isEmpty

public static <K,V> boolean isEmpty(java.util.Map<K,V> m)

Is the Map null or empty?

Parameters:

m - The map

Returns:

true if the string is null or empty

See Also:

isEmpty(Collection), isEmpty(Object[]), isEmpty(String), isEmpty(CharSequence)

size

public static <T> int size(java.util.Collection<T> collection)

Get the size of the collection

Parameters:

collection - The collection

Returns:

0 if the collection is null, actual size of the collection otherwise

See Also:

size(Object[]), size(String), size(CharSequence)

size

public static <T> int size(T[] array)

Get the size of the array

Parameters:

array - The array

Returns:

0 if the array is null, actual size of the array otherwise

See Also:

size(Collection), size(String), size(CharSequence)

size

public static int size(java.lang.String s)

Get the size of the string

Parameters:

s - The string

Returns:

0 if the string is null or empty, actual size of the string otherwise

See Also:

size(Collection), size(Object[]), size(CharSequence)

size

public static int size(java.lang.CharSequence cs)

Get the size of the charSequence

Parameters:

cs - The charSequence

Returns:

0 if the charSequence is null or empty, actual size of the charSequence otherwise

See Also:

size(Collection), size(Object[]), size(String)

equals

public static boolean equals(java.lang.Object a,
                             java.lang.Object b)

Are two strings equal?

Parameters:

a - first string

b - second string

Returns:

1) false, if either is null
2) false, if both are null
3) false, if string do not match
4) true, otherwise

equalsRelaxed

public static boolean equalsRelaxed(java.lang.Object a,
                                    java.lang.Object b)

Are two strings equal ignoring case?

Parameters:

a - first string

b - second string

Returns:

1) false, if either is null
2) false, if both are null
3) false, if string do not match
4) true, otherwise

contains

public static boolean contains(java.lang.String source,
                               java.lang.String searchTerm)

Does source has searchTerm in it?

Parameters:

source - the source to be searched

searchTerm - the term to search

Returns:

true if searchTerm is found in source, otherwise false. Also false if either or both params are null

containsIgnoreCase

public static boolean containsIgnoreCase(java.lang.String source,
                                         java.lang.String searchTerm)

Does source has searchTerm in it ignoring case?

Parameters:

source - the source to be searched

searchTerm - the term to search

Returns:

true if searchTerm is found in source, otherwise false. Also false if either or both params are null

typeCast

public static <T> T typeCast(java.lang.Object o,
                             java.lang.Class<T> clazz)

Integer i=typeCast(object,Integer.class);

Parameters:

o - Object to be casted

clazz - casting type

Returns:

Casted Object, null if failed

stringify

public static java.lang.String stringify(java.lang.String message,
                                         java.util.Collection collection)

Get string out of Collection

Parameters:

message - Optional prefix text

collection - The collection

Returns:

Stringified collection

stringify

public static java.lang.String stringify(java.util.Collection collection)

Get string out of Collection

same as calling stringify(null,collection)

Parameters:

collection - The collection

Returns:

Stringified collection

stringify

public static java.lang.String stringify(java.lang.String message,
                                         java.util.Map map)

Get string out of Map

Parameters:

message - Optional prefix text

map - The Map

Returns:

Stringified map

stringify

public static java.lang.String stringify(java.util.Map map)

Get string out of Map

same as calling stringify(null,collection)

Parameters:

map - The map

Returns:

Stringified map

isAnyEmpty

public static boolean isAnyEmpty(java.lang.Object... objects)

Is any object passed is null or empty.

Usage: isAnyEmpty(string1,string2,string3,string4)
Usage: isAnyEmpty(collection,map,string,charSequence,object)

Parameters:

objects - objects to be checked

Returns:

true, if any of the object passed is null or empty, false otherwise

isAllEmpty

public static boolean isAllEmpty(java.lang.Object... objects)

Are all the object passed is null or empty.

Usage: isAnyEmpty(string1,string2,string3,string4)
Usage: isAnyEmpty(collection,map,string,charSequence,object)

Parameters:

objects - objects to be checked

Returns:

true, if all of the object passed is null or empty, false otherwise

getString

public static java.lang.String getString(java.lang.Object o)

Get string from an object

Parameters:

o - The object

Returns:

null if object is null, otherwise a string representation of the object

getStringSafe

public static java.lang.String getStringSafe(java.lang.Object o)

Get string from an object

Parameters:

o - The object

Returns:

empty string if object is null, otherwise a string representation of the object

emptyMapMutable

public static java.util.Map<java.lang.String,java.lang.String> emptyMapMutable()

Get empty mutable hashMap

Returns:

mutable hashMap

emptySetMutable

public static java.util.Set<java.lang.String> emptySetMutable()

Get empty mutable hashSet

Returns:

mutable hashSet

safeUrlEncode

public static java.lang.String safeUrlEncode(java.lang.String s,
                                             java.lang.String enc)

Safe url encode.
Translates a string into x-www-form-urlencoded format.

Parameters:

s - String to UrlEncode

enc - The name of a supported character encoding.

Returns:

Url encoded string