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A micro framework for creating web applications in Kotlin and Java 8 with minimal effort
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/*
 * Copyright 2011- Per Wendel
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package spark;


/**
 * A TemplateViewRoute is built up by a path (for url-matching) and the implementation of the 'render' method.
 * TemplateViewRoute instead of returning the result of calling toString() as body, it returns the result of calling render method.
 * The primary purpose of this kind of Route is provide a way to create generic and reusable components for rendering output using a Template Engine. For example to render objects to html by using Freemarker template engine..
 *
 * @author alex
 */
public abstract class TemplateViewRouteImpl extends RouteImpl {

    /**
     * factory method
     *
     * @param path   the path
     * @param route  the route
     * @param engine the engine
     * @return the wrapper template view route
     */
    public static TemplateViewRouteImpl create(String path,
                                               TemplateViewRoute route,
                                               TemplateEngine engine) {

        return create(path, Service.DEFAULT_ACCEPT_TYPE, route, engine);
    }

    /**
     * factory method
     *
     * @param path       the path
     * @param acceptType the accept type
     * @param route      the route
     * @param engine     the engine
     * @return the wrapper template view route
     */
    public static TemplateViewRouteImpl create(String path,
                                               String acceptType,
                                               TemplateViewRoute route,
                                               TemplateEngine engine) {

        return new TemplateViewRouteImpl(path, acceptType, route) {
            @Override
            public String render(ModelAndView modelAndView) {
                return engine.render(modelAndView);
            }

            @Override
            public Object handle(Request request, Response response) throws Exception {
                return route.handle(request, response);
            }
        };
    }

    /**
     * Constructor
     *
     * @param path       the path
     * @param acceptType the accept type
     * @param route
     */
    protected TemplateViewRouteImpl(String path, String acceptType, TemplateViewRoute route) {
        super(path, acceptType, route);
    }


    @Override
    public Object render(Object object) {
        ModelAndView modelAndView = (ModelAndView) object;
        return render(modelAndView);
    }

    /**
     * Creates a new ModelAndView object with given arguments.
     *
     * @param model    object.
     * @param viewName t be rendered.
     * @return object with model and view set.
     */
    public ModelAndView modelAndView(Object model, String viewName) {
        return new ModelAndView(model, viewName);
    }

    /**
     * Method called to render the output that is sent to client.
     *
     * @param modelAndView object where object (mostly a POJO) and the name of the view to render are set.
     * @return message that it is sent to client.
     */
    public abstract Object render(ModelAndView modelAndView);

}