Initial commit

Author: nishanthd

.gitignore

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+.settings/
+
+target/
+.classpath

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>spring-boot-rest-design</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.springframework.ide.eclipse.core.springbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.springframework.ide.eclipse.core.springnature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>

pom.xml

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+<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>com.nishanthd</groupId>
+	<artifactId>spring-boot-rest-design</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<packaging>jar</packaging>
+
+	<name>spring-boot-rest-design</name>
+	<url>http://maven.apache.org</url>
+
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.0.1.RELEASE</version>
+	</parent>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<java.version>1.8</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>3.8.1</version>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

src/main/java/com/ndevs/fridge/App.java

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+package com.ndevs.fridge;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * 
+ * @author Nishanth Dharmaraju
+ *
+ */
+@SpringBootApplication
+public class App {
+	public static void main(String[] args) {
+		SpringApplication.run(App.class, args);
+	}
+}

src/main/java/com/ndevs/fridge/FridgeControllerAdvice.java

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+package com.ndevs.fridge;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;
+
+import com.ndevs.fridge.dto.ErrorResponse;
+import com.ndevs.fridge.exception.NoItemFoundException;
+
+/**
+ * 
+ * @author Nishanth Dharmaraju
+ *
+ */
+@ControllerAdvice
+public class FridgeControllerAdvice {
+
+	/**
+	 * Called when no handler defined for a corresponding exception
+	 * 
+	 * @param exception
+	 * @return
+	 */
+	@ExceptionHandler(Exception.class)
+	public ResponseEntity<ErrorResponse> globalException(Exception exception) {
+		return ResponseEntity.unprocessableEntity().body(new ErrorResponse("serverError", "Internal server error"));
+	}
+
+	@ExceptionHandler(NoItemFoundException.class)
+	public ResponseEntity<ErrorResponse> noItemFound(NoItemFoundException exception) {
+
+		return ResponseEntity.ok(new ErrorResponse(exception.getErrorCode(), exception.getMessage()));
+
+	}
+
+	@ExceptionHandler(MethodArgumentTypeMismatchException.class)
+	public ResponseEntity<ErrorResponse> mismatch(MethodArgumentTypeMismatchException exception) {
+
+		return ResponseEntity.badRequest()
+				.body(new ErrorResponse(exception.getErrorCode(), exception.getLocalizedMessage()));
+
+	}
+
+}

src/main/java/com/ndevs/fridge/controller/FridgeController.java

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+package com.ndevs.fridge.controller;
+
+import java.util.List;
+
+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.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.ndevs.fridge.dto.FridgeItem;
+import com.ndevs.fridge.exception.NoItemFoundException;
+import com.ndevs.fridge.service.FridgeService;
+
+/**
+ * 
+ * @author Nishanth Dharmaraju
+ *
+ */
+@RestController
+@RequestMapping("/fridge")
+public class FridgeController {
+
+	@Autowired
+	FridgeService fridgeService;
+
+	@RequestMapping("/")
+	public ResponseEntity<List<FridgeItem>> getAllItems() {
+
+		return ResponseEntity.ok(fridgeService.getAllItems());
+	}
+
+	@RequestMapping("/{id}")
+	public ResponseEntity<FridgeItem> getItemById(@PathVariable("id") Integer itemId) throws NoItemFoundException {
+
+		return ResponseEntity.ok(fridgeService.getItemByType(itemId));
+	}
+
+}

src/main/java/com/ndevs/fridge/dto/ErrorResponse.java

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+package com.ndevs.fridge.dto;
+
+public class ErrorResponse {
+
+	private String error;
+	private String description;
+
+	public ErrorResponse(String error, String description) {
+		super();
+		this.error = error;
+		this.description = description;
+	}
+
+	public String getError() {
+		return error;
+	}
+
+	public void setError(String error) {
+		this.error = error;
+	}
+
+	public String getDescription() {
+		return description;
+	}
+
+	public void setDescription(String description) {
+		this.description = description;
+	}
+
+}

src/main/java/com/ndevs/fridge/dto/FridgeItem.java

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+package com.ndevs.fridge.dto;
+
+public class FridgeItem {
+
+	private Integer itemType;
+
+	private String name;
+
+	private Integer quantity;
+
+	public Integer getItemType() {
+		return itemType;
+	}
+
+	public void setItemType(Integer itemType) {
+		this.itemType = itemType;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public Integer getQuantity() {
+		return quantity;
+	}
+
+	public void setQuantity(Integer quantity) {
+		this.quantity = quantity;
+	}
+
+}

src/main/java/com/ndevs/fridge/exception/NestedException.java

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+package com.ndevs.fridge.exception;
+
+/**
+ * Abstract superclass for all exceptions thrown in the controller package and
+ * subpackages.
+ * 
+ * This class is to force every exception class to define
+ * {@code:getErrorCode()} method.
+ * 
+ * @author Nishanth Dharmaraju
+ *
+ */
+public abstract class NestedException extends Exception {
+
+	NestedException(String message) {
+		super(message);
+	}
+
+	/**
+	 * Returns error code of the exception
+	 */
+	public abstract String getErrorCode();
+
+}

src/main/java/com/ndevs/fridge/exception/NoItemFoundException.java

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+package com.ndevs.fridge.exception;
+
+/**
+ * Exception thrown when finding zero item.
+ * 
+ * @author Nishanth Dharmaraju
+ *
+ */
+public class NoItemFoundException extends NestedException {
+
+	public static final String ERROR_CODE = "noItemFound";
+
+	public NoItemFoundException(String message) {
+		super(message);
+	}
+
+	@Override
+	public String getErrorCode() {
+		return ERROR_CODE;
+	}
+
+}

src/main/java/com/ndevs/fridge/model/FridgeItem.java

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+package com.ndevs.fridge.model;
+
+public class FridgeItem {
+
+}

src/main/java/com/ndevs/fridge/service/FridgeService.java

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+package com.ndevs.fridge.service;
+
+import java.util.List;
+
+import com.ndevs.fridge.dto.FridgeItem;
+import com.ndevs.fridge.exception.NoItemFoundException;
+
+/**
+ * 
+ * @author Nishanth Dharmaraju
+ *
+ */
+public interface FridgeService {
+
+	List<FridgeItem> getAllItems();
+
+	FridgeItem getItemByType(Integer itemType) throws NoItemFoundException;
+
+}

src/main/java/com/ndevs/fridge/service/impl/FridgeServiceImpl.java

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+package com.ndevs.fridge.service.impl;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.springframework.stereotype.Service;
+
+import com.ndevs.fridge.dto.FridgeItem;
+import com.ndevs.fridge.exception.NoItemFoundException;
+import com.ndevs.fridge.service.FridgeService;
+
+/**
+ * 
+ * @author Nishanth Dharmaraju
+ *
+ */
+@Service
+public class FridgeServiceImpl implements FridgeService {
+
+	private static final int FRUIT = 1;
+	private static final int DRINKS = 2;
+	private static final int MEAT = 4;
+
+	@Override
+	public List<FridgeItem> getAllItems() {
+
+		FridgeItem fruit = new FridgeItem();
+		fruit.setItemType(FRUIT);
+		fruit.setName("Fruit");
+		fruit.setQuantity(10);
+		FridgeItem drinks = new FridgeItem();
+		drinks.setItemType(DRINKS);
+		drinks.setName("Drinks");
+		drinks.setQuantity(20);
+		FridgeItem meat = new FridgeItem();
+		meat.setItemType(MEAT);
+		meat.setName("Meat");
+		meat.setQuantity(3);
+
+		return Arrays.asList(fruit, drinks, meat);
+	}
+
+	@Override
+	public FridgeItem getItemByType(Integer itemType) throws NoItemFoundException {
+
+		FridgeItem item = null;
+
+		if (itemType.equals(FRUIT)) {
+			item = new FridgeItem();
+			item.setItemType(FRUIT);
+			item.setName("Fruit");
+			item.setQuantity(10);
+		} else {
+			throw new NoItemFoundException("No such item found");
+		}
+
+		return item;
+	}
+
+}