java.lang.Object
- com.erudika.para.core.utils.Utils

```
public final class Utils
extends Object
```
Miscellaneous Para utilities.

Author:

Alex Bogdanovski [alex@erudika.com]

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static String`	`abbreviate(String str, int max)`	Abbreviates a string.
`static String`	`abbreviateInt(Number number, int decPlaces)`	Abbreviates an integer by adding a letter suffix at the end.
`static String`	`arrayJoin(List<String> arr, String separator)`	Joins a list of strings to String using a separator.
`static String`	`base64dec(String str)`	Decodes a string from Base64.
`static String`	`base64enc(byte[] str)`	Encodes a byte array to Base64.
`static String`	`base64encURL(byte[] str)`	Encodes a byte array to Base64.
`static String`	`bcrypt(String s)`	bcrypt hash function implemented by Spring Security.
`static boolean`	`bcryptMatches(String plain, String storedHash)`	Checks if a hash matches a string.
`static String`	`compileMustache(Map<String,Object> context, String template)`
`static String`	`compileMustache(Map<String,Object> context, String template, boolean escapeHtml)`	Compiles a mustache template with a given scope (map of fields and values).
`static String`	`escapeJavascript(String str)`	Escapes JavaScript.
`static String`	`formatDate(Long timestamp, String format, Locale loc)`	Formats a date in a specific format.
`static String`	`formatDate(String format, Locale loc)`	Formats the date for today, in a specific format.
`static String`	`formatMessage(String msg, Object... params)`	Formats a messages containing {0}, {1}...
`static String`	`formatPrice(double price)`	Returns the price with two fractional digits at the end.
`static String`	`generateSecurityToken()`	Generates an authentication token - a random 32 byte string encoded in Base64.
`static String`	`generateSecurityToken(int length)`	Generates an authentication token - a random string encoded in Base64.
`static String`	`generateSecurityToken(int length, boolean urlSafe)`	Generates an authentication token - a random string encoded in Base64.
`static List<Field>`	`getAllDeclaredFields(Class<? extends ParaObject> clazz)`	Returns a list of all declared fields in a class.
`static String`	`getBaseURL(String url)`	The basic URL without any parameters: >scheme<:>authority<.
`static int`	`getCurrentYear()`	Returns the current year.
`static String`	`getHostFromURL(String url)`	Returns the host part of the URL.
`static HumanTime`	`getHumanTime()`	HumanTime - a relative time formatter.
`static Utils`	`getInstance()`	Returns an instance of this class.
`static Locale`	`getLocale(String localeStr)`
`static String[]`	`getMonths(Locale locale)`	Returns an array of the months in the Gregorian calendar.
`static String`	`getNewId()`	Distributed id generator.
`static String`	`getObjectURI(ParaObject obj, boolean includeName, boolean includeId)`	Returns the default URL for a given domain object.
`static String`	`getSystemProperty(String name)`	Same as `System.getProperty(java.lang.String)`.
`static String`	`hmacSHA256(String message, String secret)`	Computes the HmacSHA256 hash of a message.
`static boolean`	`isBasicType(Class<?> clazz)`	Checks if a class is primitive, String or a primitive wrapper.
`static boolean`	`isJsonType(String contentType)`	Checks if a response is of type JSON.
`static boolean`	`isValidEmail(String email)`	Email validation.
`static boolean`	`isValidURL(String url)`	URL validation.
`static String`	`markdownToHtml(String markdownString)`	Converts Markdown to HTML.
`static String`	`markdownToHtml(String markdownString, boolean htmlTagsRenderingEnabled)`	Converts Markdown to HTML.
`static String`	`md5(String s)`	md5 hash function.
`static String`	`noSpaces(String str, String replaceWith)`	Converts spaces to dashes.
`static int`	`round(float d)`	Rounds a float to an int.
`static double`	`roundHalfUp(double d)`	Round up a double using the "half up" method.
`static double`	`roundHalfUp(double d, int scale)`	Round up a double using the "half up" method.
`static String`	`singularToPlural(String singul)`	Quick and dirty singular to plural conversion.
`static String`	`stripAndTrim(String str)`	Strips all symbols, punctuation, whitespace and control chars from a string.
`static String`	`stripAndTrim(String str, String replaceWith)`	Strips all symbols, punctuation, whitespace and control chars from a string.
`static String`	`stripAndTrim(String str, String replaceWith, boolean asciiOnly)`	Strips all symbols, punctuation, whitespace and control chars from a string.
`static String`	`stripHtml(String html)`	Strips all HTML tags from a string.
`static long`	`timestamp()`	Java timestamp.
`static String`	`type(Class<? extends ParaObject> clazz)`	Returns the simple name of a class in lowercase (AKA the type).
`static String`	`urlDecode(String s)`	Decodes a URL-encoded string.
`static String`	`urlEncode(String s)`	URL-encodes a string.

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

- Method Detail
  - getInstance
```
public static Utils getInstance()
```
    Returns an instance of this class.
    
    Returns:
    
    an instance
  - getHumanTime
```
public static HumanTime getHumanTime()
```
    HumanTime - a relative time formatter.
    
    Returns:
    
    humantime instance
  - md5
```
public static String md5(String s)
```
    md5 hash function.
    
    Parameters:
    
    s - the string to be hashed
    
    Returns:
    
    an md5 hash
  - hmacSHA256
```
public static String hmacSHA256(String message,
                                String secret)
```
    Computes the HmacSHA256 hash of a message.
    
    Parameters:
    
    message - a message as UTF-8 encoded string
    
    secret - a secret key
    
    Returns:
    
    base64(hmacSHA256(message, secret))
  - bcrypt
```
public static String bcrypt(String s)
```
    bcrypt hash function implemented by Spring Security.
    
    Parameters:
    
    s - the string to be hashed
    
    Returns:
    
    the hash
  - bcryptMatches
```
public static boolean bcryptMatches(String plain,
                                    String storedHash)
```
    Checks if a hash matches a string.
    
    Parameters:
    
    plain - plain text string
    
    storedHash - hashed string
    
    Returns:
    
    true if the hash matches
  - generateSecurityToken
```
public static String generateSecurityToken(int length,
                                           boolean urlSafe)
```
    Generates an authentication token - a random string encoded in Base64.
    
    Parameters:
    
    length - the length of the generated token
    
    urlSafe - switches to a URL safe encoding
    
    Returns:
    
    a random string
  - generateSecurityToken
```
public static String generateSecurityToken(int length)
```
    Generates an authentication token - a random string encoded in Base64.
    
    Parameters:
    
    length - the length of the generated token
    
    Returns:
    
    a random string
  - generateSecurityToken
```
public static String generateSecurityToken()
```
    Generates an authentication token - a random 32 byte string encoded in Base64.
    
    Returns:
    
    a random string
  - escapeJavascript
```
public static String escapeJavascript(String str)
```
    Escapes JavaScript.
    
    Parameters:
    
    str - a javascript string
    
    Returns:
    
    the escaped javascript string
  - stripHtml
```
public static String stripHtml(String html)
```
    Strips all HTML tags from a string.
    
    Parameters:
    
    html - HTML string
    
    Returns:
    
    just the text
  - markdownToHtml
```
public static String markdownToHtml(String markdownString)
```
    Converts Markdown to HTML.
    
    Parameters:
    
    markdownString - Markdown
    
    Returns:
    
    HTML
  - markdownToHtml
```
public static String markdownToHtml(String markdownString,
                                    boolean htmlTagsRenderingEnabled)
```
    Converts Markdown to HTML.
    
    Parameters:
    
    markdownString - Markdown
    
    htmlTagsRenderingEnabled - if true, basic HTML tags will be rendered instead of escaped
    
    Returns:
    
    HTML
  - compileMustache
```
public static String compileMustache(Map<String,Object> context,
                                     String template,
                                     boolean escapeHtml)
```
    Compiles a mustache template with a given scope (map of fields and values).
    
    Parameters:
    
    context - a map of fields and values
    
    template - a Mustache template
    
    Returns:
    
    the compiled template string
  - compileMustache
```
public static String compileMustache(Map<String,Object> context,
                                     String template)
```
    Parameters:
    
    context - a map of fields and values
    
    template - a Mustache template
    
    Returns:
    
    the compiled template string
    
    See Also:
    
    compileMustache(java.util.Map, java.lang.String, boolean)
  - abbreviate
```
public static String abbreviate(String str,
                                int max)
```
    Abbreviates a string.
    
    Parameters:
    
    str - a string
    
    max - max length
    
    Returns:
    
    a substring of that string
  - arrayJoin
```
public static String arrayJoin(List<String> arr,
                               String separator)
```
    Joins a list of strings to String using a separator.
    
    Parameters:
    
    arr - a list of strings
    
    separator - a separator string
    
    Returns:
    
    a string
  - stripAndTrim
```
public static String stripAndTrim(String str)
```
    Strips all symbols, punctuation, whitespace and control chars from a string.
    
    Parameters:
    
    str - a dirty string
    
    Returns:
    
    a clean string
  - stripAndTrim
```
public static String stripAndTrim(String str,
                                  String replaceWith)
```
    Strips all symbols, punctuation, whitespace and control chars from a string.
    
    Parameters:
    
    str - a dirty string
    
    replaceWith - a string to replace spaces with
    
    Returns:
    
    a clean string
  - stripAndTrim
```
public static String stripAndTrim(String str,
                                  String replaceWith,
                                  boolean asciiOnly)
```
    Strips all symbols, punctuation, whitespace and control chars from a string.
    
    Parameters:
    
    str - a dirty string
    
    replaceWith - a string to replace spaces with
    
    asciiOnly - if true, all non-ASCII characters will be stripped
    
    Returns:
    
    a clean string
  - noSpaces
```
public static String noSpaces(String str,
                              String replaceWith)
```
    Converts spaces to dashes.
    
    Parameters:
    
    str - a string with spaces
    
    replaceWith - a string to replace spaces with
    
    Returns:
    
    a string with dashes
  - formatMessage
```
public static String formatMessage(String msg,
                                   Object... params)
```
    Formats a messages containing {0}, {1}... etc. Used for translation.
    
    Parameters:
    
    msg - a message with placeholders
    
    params - objects used to populate the placeholders
    
    Returns:
    
    a formatted message
  - base64enc
```
public static String base64enc(byte[] str)
```
    Encodes a byte array to Base64.
    
    Parameters:
    
    str - the byte array
    
    Returns:
    
    an encoded string
  - base64encURL
```
public static String base64encURL(byte[] str)
```
    Encodes a byte array to Base64. URL safe.
    
    Parameters:
    
    str - the byte array
    
    Returns:
    
    an encoded string
  - base64dec
```
public static String base64dec(String str)
```
    Decodes a string from Base64.
    
    Parameters:
    
    str - the encoded string
    
    Returns:
    
    a decoded string
  - formatDate
```
public static String formatDate(Long timestamp,
                                String format,
                                Locale loc)
```
    Formats a date in a specific format.
    
    Parameters:
    
    timestamp - the Java timestamp
    
    format - the date format
    
    loc - the locale instance
    
    Returns:
    
    a formatted date
  - formatDate
```
public static String formatDate(String format,
                                Locale loc)
```
    Formats the date for today, in a specific format.
    
    Parameters:
    
    format - the date format
    
    loc - the locale instance
    
    Returns:
    
    today's date formatted
  - getCurrentYear
```
public static int getCurrentYear()
```
    Returns the current year.
    
    Returns:
    
    this year
  - timestamp
```
public static long timestamp()
```
    Java timestamp.
    
    Returns:
    
    System.currentTimeMillis()
  - getMonths
```
public static String[] getMonths(Locale locale)
```
    Returns an array of the months in the Gregorian calendar.
    
    Parameters:
    
    locale - the locale used for the months' names
    
    Returns:
    
    an array of the 12 months
  - getLocale
```
public static Locale getLocale(String localeStr)
```
    Parameters:
    
    localeStr - locale string
    
    Returns:
    
    a Locale instance from a locale string.
  - round
```
public static int round(float d)
```
    Rounds a float to an int.
    
    Parameters:
    
    d - a float
    
    Returns:
    
    a rounded int
  - formatPrice
```
public static String formatPrice(double price)
```
    Returns the price with two fractional digits at the end.
    
    Parameters:
    
    price - a price
    
    Returns:
    
    $###.##
  - roundHalfUp
```
public static double roundHalfUp(double d)
```
    Round up a double using the "half up" method.
    
    Parameters:
    
    d - a double
    
    Returns:
    
    a double
  - roundHalfUp
```
public static double roundHalfUp(double d,
                                 int scale)
```
    Round up a double using the "half up" method.
    
    Parameters:
    
    d - a double
    
    scale - the scale
    
    Returns:
    
    a double
  - abbreviateInt
```
public static String abbreviateInt(Number number,
                                   int decPlaces)
```
    Abbreviates an integer by adding a letter suffix at the end. E.g. "M" for millions, "K" for thousands, etc.
    
    Parameters:
    
    number - a big integer
    
    decPlaces - decimal places
    
    Returns:
    
    the rounded integer as a string
  - urlDecode
```
public static String urlDecode(String s)
```
    Decodes a URL-encoded string.
    
    Parameters:
    
    s - a string
    
    Returns:
    
    the decoded string
  - urlEncode
```
public static String urlEncode(String s)
```
    URL-encodes a string.
    
    Parameters:
    
    s - a string
    
    Returns:
    
    the encoded string
  - isValidURL
```
public static boolean isValidURL(String url)
```
    URL validation.
    
    Parameters:
    
    url - a URL
    
    Returns:
    
    true if the URL is valid
  - isValidEmail
```
public static boolean isValidEmail(String email)
```
    Email validation.
    
    Parameters:
    
    email - email address
    
    Returns:
    
    true if the URL is valid
  - getHostFromURL
```
public static String getHostFromURL(String url)
```
    Returns the host part of the URL.
    
    Parameters:
    
    url - a URL
    
    Returns:
    
    just the host
  - getBaseURL
```
public static String getBaseURL(String url)
```
    The basic URL without any parameters: >scheme<:>authority<.
    
    Parameters:
    
    url - a full URL
    
    Returns:
    
    the basic URL
  - getObjectURI
```
public static String getObjectURI(ParaObject obj,
                                  boolean includeName,
                                  boolean includeId)
```
    Returns the default URL for a given domain object.
    
    Parameters:
    
    obj - the domain object
    
    includeName - true if we want to include the name of the object in the URL
    
    includeId - true if we want to include the ID of the object in the URL
    
    Returns:
    
    the object's URL - e.g. /users/123-name, /users/, /users/123
  - getSystemProperty
```
public static String getSystemProperty(String name)
```
    Same as System.getProperty(java.lang.String).
    
    Parameters:
    
    name - the name of the property
    
    Returns:
    
    the property value
  - isJsonType
```
public static boolean isJsonType(String contentType)
```
    Checks if a response is of type JSON.
    
    Parameters:
    
    contentType - the value of "Content-Type" header
    
    Returns:
    
    true if JSON
  - singularToPlural
```
public static String singularToPlural(String singul)
```
    Quick and dirty singular to plural conversion.
    
    Parameters:
    
    singul - a word
    
    Returns:
    
    a guess of its plural form
  - isBasicType
```
public static boolean isBasicType(Class<?> clazz)
```
    Checks if a class is primitive, String or a primitive wrapper.
    
    Parameters:
    
    clazz - a class
    
    Returns:
    
    true if primitive or wrapper
  - type
```
public static String type(Class<? extends ParaObject> clazz)
```
    Returns the simple name of a class in lowercase (AKA the type).
    
    Parameters:
    
    clazz - a core class
    
    Returns:
    
    just the name in lowercase or an empty string if clazz is null
  - getAllDeclaredFields
```
public static List<Field> getAllDeclaredFields(Class<? extends ParaObject> clazz)
```
    Returns a list of all declared fields in a class. Transient and serialVersionUID fields are skipped. This method scans parent classes as well.
    
    Parameters:
    
    clazz - a class to scan
    
    Returns:
    
    a list of fields including those of the parent classes excluding the Object class.
  - getNewId
```
public static String getNewId()
```
    Distributed id generator. Relies on node/worker ids and datacenter ids to prevent collisions.
    
    Returns:
    
    a long unique ID string of digits

Class Utils

Method Summary

Methods inherited from class java.lang.Object

Method Detail

getInstance

getHumanTime

md5

hmacSHA256

bcrypt

bcryptMatches

generateSecurityToken

generateSecurityToken

generateSecurityToken

escapeJavascript

stripHtml

markdownToHtml

markdownToHtml

compileMustache

compileMustache

abbreviate

arrayJoin

stripAndTrim

stripAndTrim

stripAndTrim

noSpaces

formatMessage

base64enc

base64encURL

base64dec

formatDate

formatDate

getCurrentYear

timestamp

getMonths

getLocale

round

formatPrice

roundHalfUp

roundHalfUp

abbreviateInt

urlDecode

urlEncode

isValidURL

isValidEmail

getHostFromURL

getBaseURL

getObjectURI

getSystemProperty

isJsonType

singularToPlural

isBasicType

type

getAllDeclaredFields

getNewId