decorator.js

app.config(["$provide", function ($provide) {
    $provide.decorator("$templateCache", ["$delegate", "templateRepository", function ($delegate, templateRepository) {
        // Stash away the original get method
        var origGetMethod = $delegate.get;
        // Replace it with our getter
        $delegate.get = function (url) {
            // Do we match our content type family prefix?
            var prefix = 'application/vnd.endjin.test';
            if (url.slice(0, prefix.length) == prefix) {
                return templateRepository.getTemplate(url);
            }
            
            // Otherwise, use the original get method
            return origGetMethod(url);
        };

        return $delegate;
    }]);
}]);