ioquatix/build-dependency

# Copyright, 2015, by Samuel G. D. Williams. <http://www.codeotaku.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

require 'forwardable'

module Build
    module Dependency
        # Very similar to a set but uses a specific callback (defaults to &:name) for object identity.
        class Set
            include Enumerable
            
            def initialize(contents = [])
                @table = {}
                
                contents.each do |object|
                    add(object)
                end
            end
            
            attr :table
            
            extend Forwardable
            
            def_delegators :@table, :size, :empty?, :clear, :count, :[], :to_s, :inspect
            
            def freeze
                return self if frozen?
                
                @table.freeze
                
                super
            end
            
            def initialize_dup(other)
                @table = other.table.dup
            end
            
            def identity(object)
                object.name
            end
            
            def add(object)
                if include?(object)
                    raise KeyError, "Object #{identity(object)} already exists!"
                end
                
                @table[identity(object)] = object
            end
            
            alias << add
            
            def delete(object)
                @table.delete(identity(object))
            end
            
            def include?(object)
                @table.include?(identity(object))
            end
            
            def each(&block)
                @table.each_value(&block)
            end
            
            def slice(names)
                names.collect{|name| @table[name]}
            end
        end
    end
end