package provide xotcl::pattern::link 1.0
package require XOTcl 1

namespace eval ::xotcl::pattern::link {
    namespace import ::xotcl::*

    #
    # establish/introspect 'link' through link-instproc
    #
    Class Link -parameter {
	{link ""}
    }

    Link instproc adapterFilter args {
	set l [my set link]
	set m [self calledproc]

	# let link/destroy requests go through to the link
	if {$m eq "link" || $m eq "destroy"} {
	    return [next]
	}

	if {[Object isobject $l]} {
	    puts stderr "adapting $m on link [self] -> $l"
	    eval $l $m $args
	} else {
	    # if there is currently no link establish -> return
	    if {$l eq ""} {return}
	    error "Link: object $l is no xotcl object"
	}
    }

    Link instfilter adapterFilter

    # Link L
    # Class A

    # L link A

    # L w

    # w set a 45

    # puts [w set a]

    # puts [L link]

    # #A destroy
    # puts ----1
    # L set r 45
    # puts ----2

    namespace export Link
}

namespace import ::xotcl::pattern::link::*