<ul ng-controller="mainCtl">
<li inner="{item: item}" ng-repeat="item in items" ng-class="{sel: inner.selected}">
    {{ item.Name }}
</li>
</ul>

directive('inner', [
    function() {
        return {
            restrict: 'A',
            scope: {
                inner: '='
            },
            link: function(scope, element, attr) {
                scope.inner.selected = false;
                element.bind('click', function(e) {
                    scope.inner.selected = !scope.inner.selected;
                });
            }
        };
    }]);

<ul ng-controller="mainCtl">
    <li ng-click="selected=!selected" ng-repeat="item in items" ng-class="{sel: selected}">
        {{ item.Name }}
    </li>
</ul>

angular.module('test', []).
    controller('mainCtl', ['$scope',
        function($scope) {
            $scope.items = [{Name: 'obj1'}, {Name: 'obj2'}];
            console.log($scope);
        }]).
    directive('inner', [
        function () {
            return {
                restrict: 'A',
                scope: {
                    inner: '='
                },
                link: function (scope, element, attr) {
                    var el = angular.element(element);
                    el.on('click', function (a, b, c) {
                        if (el.hasClass('sel')) {
                            el.removeClass('sel');
                        } else {
                            el.addClass('sel');
                        }
                    });
                }
            };
        }]);

app.service('selection', [function(){
    function selection(array){
       //constructor function that attaches or creates the selection logic for the array
    }


    this.create = function(input){
        return new selection(input);
    }
}]);

app.controller('myCtrl', ['selection', '$scope', function(selection, $scope){
    $scope.array = [{...},{...}];


    //Creates a selection from the array
    $scope.selection=selection.create($scope.array);
}])