# $Id: SortedComposite.xotcl,v 1.3 2005/09/09 21:07:23 neumann Exp $

package provide xotcl::pattern::sortedCompositeWithAfter 0.9
package require XOTcl

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

    Class SortedComposite -superclass Class

    @ @File {
	description {
	    Composite pattern enhanced with sorting 
	}
    }

    SortedComposite instproc remove {array element} {
	if {[my exists ${array}($element)]} {
	    my unset ${array}($element)
	}
    }

    SortedComposite instproc addOperations args {
	foreach pair $args {
	    foreach {proc op} $pair {my set operations($proc) $op}
	}
    } 

    SortedComposite instproc removeOperations args {
	foreach op $args {my remove operations $op}
    }

    SortedComposite instproc addAfterOperations args {
	foreach pair $args {
	    foreach {proc op} $pair {my set afterOperations($proc) $op}
	}
    } 
    SortedComposite instproc removeAfterOperations args {
	foreach op $args {my remove afterOperations $op}
    }

    SortedComposite instproc compositeFilter args {
	set registrationclass [lindex [self filterreg] 0]
	set r [self calledproc]
	set result [next]
	if {[$registrationclass exists operations($r)] && [my exists children]} {
	    set method [$registrationclass set operations($r)]
	    foreach object [my set children] {
		eval [self]::$object $method $args
	    }
	}
	if {[$registrationclass exists afterOperations($r)]} {
	    eval my [$registrationclass set afterOperations($r)] $args
	}
	set result
    }

    SortedComposite instproc init args {
	my array set operations {}
	my array set afterOperations {}

	my instproc setChildren args {
	    switch [llength $args] {
		0 { return [my set children] }
		1 { return [my set children [lindex $args 0]] }
		default {error "wrong # args: [self] setChildren ?children?"}
	    }
	}
	my instproc appendChildren args {
	    eval my lappend children $args
	}

	next
	my instfilter add compositeFilter 
    }

    namespace export SortedComposite
}

namespace import ::xotcl::pattern::sortedCompositeWithAfter::*