ViewVisitor.js
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ViewVisitor.js
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	/**
	* @provides javelin-view-visitor
	* @requires javelin-install
	* javelin-util
	*
	* Add new behaviors to views without changing the view classes themselves.
	*
	* Allows you to register specific visitor functions for certain view classes.
	* If no visitor is registered for a view class, the default_visitor is used.
	* If no default_visitor is invoked, a no-op visitor is used.
	*
	* Registered visitors should be functions with signature
	* function(view, results_of_visiting_children) {}
	* Children are visited before their containing parents, and the return values
	* of the visitor on the children are passed to the parent.
	*
	*/

	JX.install('ViewVisitor', {
	construct: function(default_visitor) {
	this._visitors = {};
	this._default = default_visitor \|\| JX.bag;
	},
	members: {
	_visitors: null,
	_default: null,
	register: function(cls, visitor) {
	this._visitors[cls] = visitor;
	},
	visit: function(view, children) {
	var visitor = this._visitors[cls] \|\| this._default;
	return visitor(view, children);
	}
	}
	});