B: Active Support API Reference in Java

Drawer QR Code in Java B: Active Support API Reference
Appendix B: Active Support API Reference
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handler
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Returns the proper handler for the contained string depending on $KCODE and the encoding of the string This method is used internally by Rails to always redirect messages to the proper classes depending on the context
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method missing(m, *a, & b)
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Tries to forward all undefined methods to the designated handler When a method is not defined on the handler, it sends it to the contained string instead Also responsible for making the bang (!) methods destructive, since a handler doesn t have access to change an enclosed string instance
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split(*args)
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Works just like the normal String s split method, with the exception that the items in the resulting list are Chars instances instead of String, which makes chaining calls easier
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' Caf priferl'mb_charssplit (//)map { |part| partupcaseto_s } #=> ["CAF", " P", " RIFERL"]
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tidy bytes(force = false)
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Replaces all ISO-8859-1 or CP1252 characters by their UTF-8 equivalent resulting in a valid UTF-8 string Passing true will forcibly tidy all bytes, assuming that the string s encoding is entirely CP1252 or ISO-8859-1
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> "obie"mb_charstidy_bytes => #<ActiveSupport::Multibyte::Chars:0x25faa30 @wrapped_string="obie">
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B332 active support/multibyte/unicode
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Contains methods handling Unicode strings
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Unicodecompose codepoints(codepoints)
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Composes decomposed characters to the composed form
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Unicodedecompose codepoints(type, codepoints)
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Decomposes composed characters to the decomposed form The type argument accepts :canonical or :compatability
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B33 ActiveSupport::Multibyte::Chars
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Unicodeg pack(string)
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Reverses operation of g_unpack
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Unicodeg unpack(string)
Unpacks the string at grapheme boundaries Returns a list of character lists
>> Unicodeg_unpack('ffff') => [[2325, 2381], [2359], [2367]] >> Unicodeg_unpack('Caf ') => [[67], [97], [102], [233]]
Active Support
Unicodein char class (codepoint, classes)
Detects whether the codepoint is in a certain character class Returns true when it s in the specified character class and false otherwise Valid character classes are: :cr, :lf, :l, :v, :lv, :lvt and :t Primarily used by grapheme cluster support1
Unicodenormalize(string, form = nil)
Returns the KC normalization of the string by default NFKC is considered the best normalization form for passing strings to databases and validations The form specifies the form you want to normalize in and should be one of the following: :c, :kc, :d, or :kd Default is form is stored in the ActiveSupport:: Multibytedefault_normalization_form attribute and is overridable in an initializer
Unicodereorder characters(codepoints)
Re-orders codepoints so the string becomes canonical
Unicodeu unpack(string)
Unpacks the string at codepoints boundaries Raises an EncodingError when the encoding of the string isn t valid UTF-8
>> Unicodeu_unpack('Caf ') => [67, 97, 102, 233]
B333 active support/multibyte/utils
Contains methods for verifying the encoding of character strings
1 http://unicodeorg/reports/tr29/
Appendix B: Active Support API Reference
Multibyteverify(string)
Verifies the encoding of a string Splits the string on character boundaries, which are determined based on $KCODE
>> ActiveSupport::Multibyteverify("obie") => true
Multibyteverify!(string)
Verifies the encoding of a string Splits the string on character boundaries, which are determined based on $KCODE Raises an exception if it s not valid
B34 NilClass
Remembers that everything in Ruby is an object, even nil, which is a special reference to a singleton instance of the NilClass
B341 active support/core ext/object/blank
blank
Returns true
B342 active support/json/encoding
as json
Returns "null"
B343 active support/whiny nil
Besides blank , the extensions to nil try to raise more descriptive error messages, to help Rails newbies The aim is to ensure that when developers pass nil to methods unintentionally, instead of NoMethodError and the name of some method used by the framework, they ll see a message explaining what type of object was expected The behavior was named whiny nil as an inside joke Method missing magic is used to capture the method that was erroneously invoked on nil The method name is looked up in a hash containing method names indexed to Rails classes, so that a helpful suggestion can be attempted If you ve done any amount of Rails programming, you re probably familiar with the output of this error-helping process, as the description of a NoMethodError:
You have a nil object when you didn t expect it! You might have expected an instance of class name The error occurred while evaluating nilmethod name
B35 ActiveSupport::Notifications
The whiny nil behavior can be controlled in the individual environment configurations with the following line:
configwhiny_nils = true
Active Support
Rails has it set to true by default in development and test modes, and false in production mode
NilClassadd whiner(klass)