Class: Econfig::BackendCollection

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/econfig/backend_collection.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ BackendCollection

Returns a new instance of BackendCollection.



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# File 'lib/econfig/backend_collection.rb', line 6

def initialize
  @backends = []
end

Instance Method Details

#[](name) ⇒ Object 



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# File 'lib/econfig/backend_collection.rb', line 20

def [](name)
  pair = @backends.assoc(name)
  pair.last if pair
end

#delete(name) ⇒ Object 



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# File 'lib/econfig/backend_collection.rb', line 54

def delete(name)
  @backends.delete_at(index_of!(name))
end

#each ⇒ Object 



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# File 'lib/econfig/backend_collection.rb', line 25

def each
  if block_given?
    @backends.each { |(name, backend)| yield backend }
  else
    enum_for { @backends.length }
  end
end

#get(key) ⇒ Object 



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# File 'lib/econfig/backend_collection.rb', line 58

def get(key)
  @backends.each do |(name, backend)|
    has_key = true

    if backend.respond_to?(:has_key?)
      has_key = backend.has_key?(key)
      value = backend.get(key) if has_key
    else
      value = backend.get(key) { has_key = false }
    end

    has_key or next
    return value
  end

  yield if block_given?
end

#insert_after(other, name, backend) ⇒ Object 



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# File 'lib/econfig/backend_collection.rb', line 49

def insert_after(other, name, backend)
  exists?(name)
  @backends.insert(index_of!(other) + 1, [name, backend])
end

#insert_before(other, name, backend) ⇒ Object 



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# File 'lib/econfig/backend_collection.rb', line 44

def insert_before(other, name, backend)
  exists?(name)
  @backends.insert(index_of!(other), [name, backend])
end

#keys ⇒ Object 



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# File 'lib/econfig/backend_collection.rb', line 10

def keys
  @backends.reduce(Set.new) do |agg, (name, backend)|
    if backend.respond_to?(:keys)
      agg.union(backend.keys)
    else
      agg
    end
  end
end

#push(name, backend) ⇒ Object Also known as: use 



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# File 'lib/econfig/backend_collection.rb', line 33

def push(name, backend)
  exists?(name)
  @backends.push([name, backend])
end

#unshift(name, backend) ⇒ Object 



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# File 'lib/econfig/backend_collection.rb', line 39

def unshift(name, backend)
  exists?(name)
  @backends.unshift([name, backend])
end