BAEL-4321 demo app for yaml to pojo

configuration/yaml-to-pojo/README.md

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+This is a demo application for using YAML configuration for defining values in a POJO class. 
+
+The application has an endpoint to provide T-shirt size conversion for label and countrycode.
+
+If you run this service locally you can call this endpoint on:
+
+`localhost:8080/convertSize?label=M&countryCode=fr`
+
+It should return the size as int. 

configuration/yaml-to-pojo/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.3.2.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>yaml-to-pojo</groupId>
+	<artifactId>demo</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>demo</name>
+	<description>Demo project for YAML into POJO</description>
+
+	<properties>
+		<java.version>1.8</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.junit.vintage</groupId>
+					<artifactId>junit-vintage-engine</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <version>RELEASE</version>
+        </dependency>
+    </dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

configuration/yaml-to-pojo/src/main/java/yamltopojo/demo/DemoApplication.java

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+package yamltopojo.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import yamltopojo.demo.config.TshirtSizeConfig;
+
+@SpringBootApplication
+@EnableConfigurationProperties(TshirtSizeConfig.class)
+public class DemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(DemoApplication.class, args);
+	}
+
+}

configuration/yaml-to-pojo/src/main/java/yamltopojo/demo/config/TshirtSizeConfig.java

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+package yamltopojo.demo.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+import java.util.Map;
+
+@ConfigurationProperties(prefix = "t-shirt-size")
+public class TshirtSizeConfig {
+
+    private final Map<String, Integer> simpleMapping;
+
+    private final Map<String, Map<String, Integer>> complexMapping;
+
+
+    public TshirtSizeConfig(Map<String, Integer> simpleMapping, Map<String, Map<String, Integer>> complexMapping) {
+        this.simpleMapping = simpleMapping;
+        this.complexMapping = complexMapping;
+    }
+
+    public Map<String, Integer> getSimpleMapping() {
+        return simpleMapping;
+    }
+
+    public Map<String, Map<String, Integer>> getComplexMapping() {
+        return complexMapping;
+    }
+}

configuration/yaml-to-pojo/src/main/java/yamltopojo/demo/controller/TshirtSizeController.java

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+package yamltopojo.demo.controller;
+
+import org.springframework.web.bind.annotation.*;
+import yamltopojo.demo.service.SizeConverterService;
+
+@RestController
+@RequestMapping(value = "/")
+public class TshirtSizeController {
+
+    private SizeConverterService service;
+
+    public TshirtSizeController(SizeConverterService service) {
+        this.service = service;
+    }
+
+    @RequestMapping(value ="convertSize", method = RequestMethod.GET)
+    public int convertSize(@RequestParam(value = "label") final String label,
+                                             @RequestParam(value = "countryCode", required = false) final String countryCode) {
+        return service.convertSize(label, countryCode);
+    }
+
+}

configuration/yaml-to-pojo/src/main/java/yamltopojo/demo/service/SizeConverterImpl.java

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+package yamltopojo.demo.service;
+
+import org.springframework.stereotype.Service;
+import yamltopojo.demo.config.TshirtSizeConfig;
+
+
+@Service
+public class SizeConverterImpl implements SizeConverterService {
+
+    private TshirtSizeConfig tshirtSizeConfig;
+
+    public SizeConverterImpl(TshirtSizeConfig tshirtSizeConfig) {
+        this.tshirtSizeConfig = tshirtSizeConfig;
+    }
+
+    public int  convertSize(String label, String countryCode) {
+        if(countryCode == null) {
+            return tshirtSizeConfig.getSimpleMapping().get(label);
+        }
+        return tshirtSizeConfig.getComplexMapping().get(label).get(countryCode);
+    }
+}

configuration/yaml-to-pojo/src/main/java/yamltopojo/demo/service/SizeConverterService.java

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+package yamltopojo.demo.service;
+
+
+public interface SizeConverterService {
+
+    int convertSize(String label, String countryCode);
+
+}

configuration/yaml-to-pojo/src/main/resources/application.yml

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+t-shirt-size:
+  simple-mapping:
+    XS: 6
+    S:  8
+    M:  10
+    L:  12
+    XL: 14
+
+
+  complex-mapping:
+    XS:
+      uk: 6
+      fr: 34
+      us: 2
+    S:
+      uk: 8
+      fr: 36
+      us: 4
+    M:
+      uk: 10
+      fr: 38
+      us: 6
+    L:
+      uk: 12
+      fr: 40
+      us: 8
+    XL:
+      uk: 14
+      fr: 42
+      us: 10

configuration/yaml-to-pojo/src/test/java/yamltopojo/demo/DemoApplicationTests.java

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+package yamltopojo.demo;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class DemoApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}

configuration/yaml-to-pojo/src/test/java/yamltopojo/demo/controller/TshirtSizeControllerTest.java

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+package yamltopojo.demo.controller;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import yamltopojo.demo.service.SizeConverterService;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+class TshirtSizeControllerTest {
+
+    @Mock
+    private SizeConverterService service;
+
+    @InjectMocks
+    private TshirtSizeController tested;
+
+    @Test
+    void convertSize() {
+
+        // Given
+        String label = "S";
+        String countryCode = "fr";
+        int result = 36;
+
+        //
+        when(service.convertSize(label, countryCode)).thenReturn(result);
+        int actual = tested.convertSize(label, countryCode);
+
+        // Then
+        assertEquals(actual, result);
+
+    }
+}