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rJX/src/ext/view/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);
			}
			}
			});

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