Add HATEOAS sample application

spring-boot-samples/spring-boot-sample-hateoas/src/main/java/sample/SampleHateoasApplication.java

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+/*
+ * Copyright 2012-2014 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;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableAutoConfiguration
+@ComponentScan
+public class SampleHateoasApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SampleHateoasApplication.class, args);
+	}
+
+}

spring-boot-samples/spring-boot-sample-hateoas/src/main/java/sample/domain/Customer.java

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+/*
+ * Copyright 2012-2014 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.domain;
+
+public class Customer {
+
+	private final Long id;
+
+	private final String firstName;
+
+	private final String lastName;
+
+	public Customer(Long id, String firstName, String lastName) {
+		this.id = id;
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	public Long getId() {
+		return this.id;
+	}
+
+	public String getFirstName() {
+		return this.firstName;
+	}
+
+	public String getLastName() {
+		return this.lastName;
+	}
+
+}

spring-boot-samples/spring-boot-sample-hateoas/src/main/java/sample/domain/CustomerRepository.java

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+/*
+ * Copyright 2012-2014 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.domain;
+
+import java.util.List;
+
+public interface CustomerRepository {
+
+	List<Customer> findAll();
+
+	Customer findOne(Long id);
+
+}

spring-boot-samples/spring-boot-sample-hateoas/src/main/java/sample/domain/InMemoryCustomerRepository.java

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+/*
+ * Copyright 2012-2014 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.domain;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.stereotype.Repository;
+import org.springframework.util.ObjectUtils;
+
+@Repository
+public class InMemoryCustomerRepository implements CustomerRepository {
+
+	private final List<Customer> customers = new ArrayList<Customer>();
+
+	public InMemoryCustomerRepository() {
+		this.customers.add(new Customer(1L, "Oliver", "Gierke"));
+		this.customers.add(new Customer(2L, "Andy", "Wilkinson"));
+		this.customers.add(new Customer(2L, "Dave", "Syer"));
+	}
+
+	@Override
+	public List<Customer> findAll() {
+		return this.customers;
+	}
+
+	@Override
+	public Customer findOne(Long id) {
+		for (Customer customer : this.customers) {
+			if (ObjectUtils.nullSafeEquals(customer.getId(), id)) {
+				return customer;
+			}
+		}
+		return null;
+	}
+
+}

spring-boot-samples/spring-boot-sample-hateoas/src/main/java/sample/web/CustomerController.java

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+/*
+ * Copyright 2012-2014 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.web;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.hateoas.EntityLinks;
+import org.springframework.hateoas.ExposesResourceFor;
+import org.springframework.hateoas.Resource;
+import org.springframework.hateoas.Resources;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+import sample.domain.Customer;
+import sample.domain.CustomerRepository;
+
+@Controller
+@RequestMapping("/customers")
+@ExposesResourceFor(Customer.class)
+public class CustomerController {
+
+	private final CustomerRepository repository;
+
+	private final EntityLinks entityLinks;
+
+	@Autowired
+	public CustomerController(CustomerRepository repository, EntityLinks entityLinks) {
+		this.repository = repository;
+		this.entityLinks = entityLinks;
+	}
+
+	@RequestMapping(method = RequestMethod.GET)
+	HttpEntity<Resources<Customer>> showCustomers() {
+		Resources<Customer> resources = new Resources<Customer>(this.repository.findAll());
+		resources.add(this.entityLinks.linkToCollectionResource(Customer.class));
+		return new ResponseEntity<Resources<Customer>>(resources, HttpStatus.OK);
+	}
+
+	@RequestMapping(value = "/{id}", method = RequestMethod.GET)
+	HttpEntity<Resource<Customer>> showCustomer(@PathVariable Long id) {
+		Resource<Customer> resource = new Resource<Customer>(this.repository.findOne(id));
+		resource.add(this.entityLinks.linkToSingleResource(Customer.class, id));
+		return new ResponseEntity<Resource<Customer>>(resource, HttpStatus.OK);
+	}
+
+}