Adding typesafe custom configuration

springboot-petclinic-server/pom.xml

@@ -49,6 +49,12 @@
             <optional>true</optional>
         </dependency>
 
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-configuration-processor</artifactId>
+            <optional>true</optional>
+        </dependency>
+
         <dependency>
             <groupId>org.springframework.samples</groupId>
             <artifactId>springboot-petclinic-client</artifactId>

springboot-petclinic-server/src/main/java/org/springframework/samples/petclinic/PetClinicApplication.java

@@ -2,7 +2,9 @@ package org.springframework.samples.petclinic;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
+import org.springframework.samples.petclinic.config.PetclinicProperties;
 import org.springframework.ui.ModelMap;
 import org.springframework.web.context.request.WebRequest;
 import org.springframework.web.context.request.WebRequestInterceptor;
@@ -10,6 +12,7 @@ import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 
 @SpringBootApplication
+@EnableConfigurationProperties(PetclinicProperties.class)
 public class PetClinicApplication {
 
     public static void main(String[] args) {

springboot-petclinic-server/src/main/java/org/springframework/samples/petclinic/config/PetclinicProperties.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2002-2016 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 org.springframework.samples.petclinic.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+/**
+ * Typesafe custom configuration.
+ * <p>
+ * Offers contextual help and "code completion" as users are working with application.properties.
+ *
+ * @author Antoine Rey
+ */
+@ConfigurationProperties(prefix = "petclinic")
+public class PetclinicProperties {
+
+    /**
+     * Relational database supported by SpringBoot Petclinic: hsqldb, mysql or postgresql
+     */
+    private String database;
+
+    public String getDatabase() {
+        return database;
+    }
+
+    public void setDatabase(String database) {
+        this.database = database;
+    }
+}

springboot-petclinic-server/src/main/resources/application.properties

@@ -1,7 +1,7 @@
 # database init, supports mysql too
-database=hsqldb
-spring.datasource.schema=classpath*:db/${database}/schema.sql
-spring.datasource.data=classpath*:db/${database}/data.sql
+petclinic.database=hsqldb
+spring.datasource.schema=classpath*:db/${petclinic.database}/schema.sql
+spring.datasource.data=classpath*:db/${petclinic.database}/data.sql
 
 # JPA
 spring.jpa.hibernate.ddl-auto=none
@@ -17,4 +17,4 @@ logging.level.org.springframework=INFO
 
 server.compression.enabled=true
 server.compression.mime-types=application/json,text/css,application/javascript
-server.compression.min-response-size=2048
+server.compression.min-response-size=2048