BookmarkRestController.java

/*
 * Copyright 2016 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 bookmarks;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

import java.net.URI;
import java.util.Collection;

/**
 * @author Josh Long
 */
// tag::code[]
@RestController
@RequestMapping("/{userId}/bookmarks")
class BookmarkRestController {

	private final BookmarkRepository bookmarkRepository;

	private final AccountRepository accountRepository;

	@Autowired
	BookmarkRestController(BookmarkRepository bookmarkRepository,
						   AccountRepository accountRepository) {
		this.bookmarkRepository = bookmarkRepository;
		this.accountRepository = accountRepository;
	}

	@RequestMapping(method = RequestMethod.GET)
	Collection<Bookmark> readBookmarks(@PathVariable String userId) {
		this.validateUser(userId);
		return this.bookmarkRepository.findByAccountUsername(userId);
	}

	@RequestMapping(method = RequestMethod.POST)
	ResponseEntity<?> add(@PathVariable String userId, @RequestBody Bookmark input) {
		this.validateUser(userId);

		return this.accountRepository
				.findByUsername(userId)
				.map(account -> {
					Bookmark result = bookmarkRepository.save(new Bookmark(account,
							input.uri, input.description));

					URI location = ServletUriComponentsBuilder
						.fromCurrentRequest().path("/{id}")
						.buildAndExpand(result.getId()).toUri();

					return ResponseEntity.created(location).build();
				})
				.orElse(ResponseEntity.noContent().build());

	}

	@RequestMapping(method = RequestMethod.GET, value = "/{bookmarkId}")
	Bookmark readBookmark(@PathVariable String userId, @PathVariable Long bookmarkId) {
		this.validateUser(userId);
		return this.bookmarkRepository.findOne(bookmarkId);
	}

	private void validateUser(String userId) {
		this.accountRepository.findByUsername(userId).orElseThrow(
				() -> new UserNotFoundException(userId));
	}
}
// end::code[]