Class | OpenObject |
In: |
lib/more/facets/openobject.rb
|
Parent: | Hash |
OpenObject is very similar to Ruby‘s own OpenStruct, but it offers some useful advantages. With OpenStruct slots with the same name‘s as predefined Object methods can not be used. With OpenObject any slot can be defined, OpendObject is also a bit faster becuase it is based on a Hash, not method signitures.
Because OpenObject is a subclass of Hash, it can do just about everything a Hash can do, except that most public methods have been made protected and thus available only internally or via send.
OpenObject will also clobber any method for which a slot is defined. Even generally very important methods can be clobbered, like instance_eval. So be aware of this. OpenObject should be used in well controlled scenarios.
If you wish to pass an OpenObject to a routine that normal takes a Hash, but are uncertain it can handle the distictions properly you can convert easily to a Hash using to_hash! and the result will automatically be converted back to an OpenObject on return.
o = OpenObject.new(:a=>1,:b=>2) o.as_hash!{ |h| h.update(:a=>6) } o #=> #<OpenObject {:a=>6,:b=>2}>
Finally, unlike a regular Hash, all OpenObject‘s keys are symbols and all keys are converted to such using to_sym on the fly.
PUBLIC_METHODS | = | /(^__|^instance_|^object_|^\W|^as$|^send$|^class$|\?$)/ |
Inititalizer for OpenObject is slightly differnt than that of Hash. It does not take a default parameter, but an initial priming Hash as with OpenStruct. The initializer can still take a default block however. To set the degault value use ++default!(value)++.
OpenObject(:a=>1).default!(0)
# File lib/more/facets/openobject.rb, line 102 102: def initialize( hash=nil, &yld ) 103: super( &yld ) 104: hash.each { |k,v| define_slot(k,v) } if hash 105: end
Check equality. (Should equal be true for Hash too?)
# File lib/more/facets/openobject.rb, line 175 175: def ==( other ) 176: return false unless OpenObject === other 177: super(other) #(other.send(:table)) 178: end
# File lib/more/facets/openobject.rb, line 180 180: def []=(k,v) 181: protect_slot(k) 182: super(k.to_sym,v) 183: end
Preform inplace action on OpenObject as if it were a regular Hash.
# File lib/more/facets/openobject.rb, line 169 169: def as_hash!(&yld) 170: replace(yld.call(to_hash)) 171: end
# File lib/more/facets/openobject.rb, line 107 107: def initialize_copy( orig ) 108: orig.each { |k,v| define_slot(k,v) } 109: end
Object inspection. (Careful, this can be clobbered!)
# File lib/more/facets/openobject.rb, line 113 113: def inspect 114: "#<#{object_class}:#{object_hexid} #{super}>" 115: end
Merge one OpenObject with another creating a new OpenObject.
# File lib/more/facets/openobject.rb, line 134 134: def merge( other ) 135: d = dup 136: d.send(:update, other) 137: d 138: end
Conversion methods. (Careful, these can be clobbered!)
# File lib/more/facets/openobject.rb, line 119 119: def to_a() super end
Update this OpenObject with another.
# File lib/more/facets/openobject.rb, line 142 142: def update( other ) 143: begin 144: other.each { |k,v| define_slot(k,v) } 145: rescue 146: other = other.to_h 147: retry 148: end 149: end
# File lib/more/facets/openobject.rb, line 200 200: def define_slot( key, value=nil ) 201: protect_slot( key ) 202: self[key.to_sym] = value 203: end
# File lib/more/facets/openobject.rb, line 196 196: def fetch(k,*d,&b) 197: super(k.to_sym,*d,&b) 198: end
# File lib/more/facets/openobject.rb, line 211 211: def method_missing( sym, arg=nil, &blk) 212: type = sym.to_s[-1,1] 213: key = sym.to_s.sub(/[=?!]$/,'').to_sym 214: if type == '=' 215: define_slot(key,arg) 216: elsif type == '!' 217: define_slot(key,arg) 218: self 219: else 220: self[key] 221: end 222: end
# File lib/more/facets/openobject.rb, line 205 205: def protect_slot( key ) 206: (class << self; self; end).class_eval { 207: protected key rescue nil 208: } 209: end