`class Index`

Represents an index of contexts by their identity keys.

Definitions

`def initialize`

Initialize a new Index.

Implementation

def initialize
	@contexts = {}
end

`attr :contexts`

Signature

attribute　Hash: A hash mapping identity keys to contexts.

`def add(parent)`

Add all children from a parent context to the index.

Signature

parameter　parent　Object: The parent context.

Implementation

def add(parent)
	parent.children&.each do |identity, child|
		insert(identity, child)
		add(child)
	end
end

`def insert(identity, context)`

Insert a context into the index.

Signature

parameter　identity　Identity: The identity of the context.
parameter　context　Object: The context to index.
raises　KeyError: If a context with the same key already exists.

Implementation

def insert(identity, context)
	key = identity.key
	
	if existing_context = @contexts[key]
		raise KeyError, "Assigning context to existing key: #{key.inspect}!"
	else
		@contexts[key] = context
	end
end

`def [](key)`

Look up a context by its key.

Signature

parameter　key　String: The identity key.
returns　Object, nil: The context if found.

Implementation

def [] key
	@contexts[key]
end