MessageController.java

/*
 * Copyright 2012-2017 the original author or authors.
 *
 * 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 sample.groovytemplates.mvc;

import java.util.HashMap;
import java.util.Map;

import javax.validation.Valid;

import sample.groovytemplates.Message;
import sample.groovytemplates.MessageRepository;

import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

@Controller
@RequestMapping("/")
public class MessageController {

	private final MessageRepository messageRepository;

	public MessageController(MessageRepository messageRepository) {
		this.messageRepository = messageRepository;
	}

	@GetMapping
	public ModelAndView list() {
		Iterable<Message> messages = this.messageRepository.findAll();
		return new ModelAndView("messages/list", "messages", messages);
	}

	@GetMapping("{id}")
	public ModelAndView view(@PathVariable("id") Message message) {
		return new ModelAndView("messages/view", "message", message);
	}

	@GetMapping(params = "form")
	public String createForm(@ModelAttribute Message message) {
		return "messages/form";
	}

	@PostMapping
	public ModelAndView create(@Valid Message message, BindingResult result,
			RedirectAttributes redirect) {
		if (result.hasErrors()) {
			ModelAndView mav = new ModelAndView("messages/form");
			mav.addObject("formErrors", result.getAllErrors());
			mav.addObject("fieldErrors", getFieldErrors(result));
			return mav;
		}
		message = this.messageRepository.save(message);
		redirect.addFlashAttribute("globalMessage", "Successfully created a new message");
		return new ModelAndView("redirect:/{message.id}", "message.id", message.getId());
	}

	private Map<String, ObjectError> getFieldErrors(BindingResult result) {
		Map<String, ObjectError> map = new HashMap<>();
		for (FieldError error : result.getFieldErrors()) {
			map.put(error.getField(), error);
		}
		return map;
	}

	@RequestMapping("foo")
	public String foo() {
		throw new RuntimeException("Expected exception in controller");
	}

}