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#--
# =============================================================================
# Copyright (c) 2004, Jamis Buck (jgb3@email.byu.edu)
# All rights reserved.
#
# This source file is distributed as part of the Needle dependency injection
# library for Ruby. This file (and the library as a whole) may be used only as
# allowed by either the BSD license, or the Ruby license (or, by association
# with the Ruby license, the GPL). See the "doc" subdirectory of the Needle
# distribution for the texts of these licenses.
# -----------------------------------------------------------------------------
# needle website : http://needle.rubyforge.org
# project website: http://rubyforge.org/projects/needle
# =============================================================================
#++
require 'needle/errors'
require 'needle/service-point'
module Needle
# This class is used by the Container#define! and Container#namespace!
# methods to allow an +instance_eval+'d block to create new service points
# simply by invoking imaginary methods. It is basically an empty shell, with
# almost all of the builtin methods removed from it. (This allows services
# like "hash" and "print" to be defined, where they would normally conflict
# with the Kernel methods of the same name.)
class DefinitionContext
( private_instance_methods +
protected_instance_methods +
public_instance_methods -
[ "instance_eval", "__id__", "__send__", "initialize", "remove_const",
"method_missing", "method", "class", "inspect", "to_s", "instance_variables", "block_given?" ]
).
each { |m| undef_method m }
# Create a new DefinitionContext that wraps the given container. All
# operations performed on this context will be delegated to the
# container.
def initialize( container )
@container = container
end
# A way to access the container reference being operated on from within
# the context.
def this_container
@container
end
# Delegate to Container#intercept.
def intercept( name )
@container.intercept( name )
end
# Delegate to Container#namespace.
def namespace( *parms, &block )
@container.namespace( *parms, &block )
end
# Delegate to Container#namespace_define!.
def namespace_define!( *parms, &block )
@container.namespace_define!( *parms, &block )
end
alias :namespace! :namespace_define!
# Delegate to Container#define on the new namespace.
def namespace_define( *parms, &block )
@container.namespace( *parms ) { |ns| ns.define( &block ) }
end
# Delegate to Container#require on the current container.
def require( *parms )
# this is necessary to work around an rdoc bug...rdoc doesn't like
# calling require with a variable number of arguments.
@container.__send__( :require, *parms )
end
# Delegate to Container#use on the current container, but yields the
# definition context instead of the container.
def use( opts, &block )
use! @container.defaults.merge( opts ), &block
end
# Delegate to Container#use! on the current container, but yields the
# definition context instead of the container.
def use!( opts )
original = @container.use!( opts )
if block_given?
begin
yield self
ensure
@container.use! original
end
end
original
end
# Delegates to Container#has_key?.
def has_key?( name )
@container.has_key?( name )
end
# Delegates to Container#knows_key?.
def knows_key?( name )
@container.knows_key?( name )
end
# Any method invocation with no block and no parameters is interpreted to
# be a service reference on the wrapped container, and delegates to
# Container#[]. If the block is not given but the args are not empty, a
# NoMethodError will be raised.
#
# If a block is given, this delegates to Container#register, leaving
# all parameters in place.
def method_missing( sym, *args, &block )
if block.nil?
@container.get( sym, *args )
else
@container.register( sym, *args, &block )
end
end
end
end
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