rmurano - code assessment

.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="test" value="true"/>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="test" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/5"/>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

.gitignore

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+/target/
+metadata
+bin/
+tmp/
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.settings/
+.loadpath
+.recommenders

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>cashregister</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>

SOLUTION.md

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+To test the solution, go to the tests for the file parser service and run. Check the output.txt file to see the output.
+Feel free to add files for testing. Just make sure to update the file paths in the tests.

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>2.5.4</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.softwriters</groupId>
+	<artifactId>cashregister</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>cashregister</name>
+	<description>Softwriters Code Assessment</description>
+	<properties>
+		<java.version>1.8</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-devtools</artifactId>
+			<scope>runtime</scope>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		 <!-- junit 5 -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+		</plugins>
+	</build>
+
+</project>

src/main/java/com/softwriters/cashregister/CashregisterApplication.java

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+package com.softwriters.cashregister;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class CashregisterApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(CashregisterApplication.class, args);
+	}
+
+}

src/main/java/com/softwriters/cashregister/model/ChangeModel.java

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+package com.softwriters.cashregister.model;
+
+import java.math.BigDecimal;
+
+public class ChangeModel {
+
+	private BigDecimal value;
+
+	private String currencyNameSingular;
+
+	private String currencyNamePlural;
+
+	public ChangeModel(String value, String currencyNameSingular, String currencyNamePlural) {
+		this.value = new BigDecimal(value);
+		this.currencyNameSingular = currencyNameSingular;
+		this.currencyNamePlural = currencyNamePlural;
+	}
+
+	public BigDecimal getValue() {
+		return value;
+	}
+
+	public void setValue(BigDecimal value) {
+		this.value = value;
+	}
+
+	public String getCurrencyNameSingular() {
+		return currencyNameSingular;
+	}
+
+	public void setCurrencyNameSingular(String currencyNameSingular) {
+		this.currencyNameSingular = currencyNameSingular;
+	}
+
+	public String getCurrencyNamePlural() {
+		return currencyNamePlural;
+	}
+
+	public void setCurrencyNamePlural(String currencyNamePlural) {
+		this.currencyNamePlural = currencyNamePlural;
+	}
+
+	public String getCurrencyName(int numberOfDenominations) {
+		if(numberOfDenominations>1) {
+			return this.currencyNamePlural;
+		}
+		else {
+			return this.currencyNameSingular;
+		}
+	}
+
+}

src/main/java/com/softwriters/cashregister/service/ChangeProcessingService.java

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+package com.softwriters.cashregister.service;
+
+import java.math.BigDecimal;
+import java.util.HashSet;
+
+import com.softwriters.cashregister.util.ChangeUtil;
+
+public class ChangeProcessingService {
+
+	public ChangeProcessingService() {
+
+	}
+
+	public String calculateChange(BigDecimal totalDue, BigDecimal amountGiven) {
+
+		String change = "";
+		//Determine change needed
+		BigDecimal changeNeeded = amountGiven.subtract(totalDue);
+
+		for(int i=0;i<ChangeUtil.change.length;i++) {
+
+			int numberOfChange = 0;
+
+			//iterate from highest change value to lowest and subtract till less than zero or zero		
+			while((changeNeeded.subtract(ChangeUtil.change[i].getValue()).compareTo(ChangeUtil.zero)==1)||
+					(changeNeeded.subtract(ChangeUtil.change[i].getValue()).compareTo(ChangeUtil.zero)==0)) {
+
+				//track number of change denominations and subtract from total change required
+				numberOfChange++;
+				changeNeeded = changeNeeded.subtract(ChangeUtil.change[i].getValue());
+			}
+			//create strings for change based on number of change denominations
+			if(numberOfChange>0)
+				change += numberOfChange + " " + ChangeUtil.change[i].getCurrencyName(numberOfChange) + ",";
+
+
+		}
+
+		return change.substring(0, change.length()-1);
+	}
+
+	public String calculateRandomChange(BigDecimal totalDue, BigDecimal amountGiven) {
+
+		String change = "";
+
+		//Determine change needed
+		BigDecimal changeNeeded = amountGiven.subtract(totalDue);
+
+		//Create a hash set to keep track of used change value indexes
+		HashSet<Integer> indexSet = new HashSet<>();
+
+		//While all denominations haven't been used and change needed isn't zero
+		while(indexSet.size()!=ChangeUtil.change.length && changeNeeded.compareTo(ChangeUtil.zero)!= 0) {
+
+			//generate random index
+			int randomIndex = generateRandomIndex();
+
+			//check to see if random index already used; if so re-calculate till find one
+			while(indexSet.contains(randomIndex)) {
+				randomIndex = generateRandomIndex();
+			}
+
+			int numberOfChange = 0;
+
+			//subtract change till at zero or less than zero
+			while((changeNeeded.subtract(ChangeUtil.change[randomIndex].getValue()).compareTo(ChangeUtil.zero)==1)||
+					(changeNeeded.subtract(ChangeUtil.change[randomIndex].getValue()).compareTo(ChangeUtil.zero)==0)) {
+
+				numberOfChange++;
+				changeNeeded = changeNeeded.subtract(ChangeUtil.change[randomIndex].getValue());
+			}
+
+			if(numberOfChange>0)
+				change += numberOfChange + " " + ChangeUtil.change[randomIndex].getCurrencyName(numberOfChange) + ",";
+
+			//Add index to set
+			indexSet.add(randomIndex);
+		}
+
+
+		return change.substring(0, change.length()-1);
+	}
+
+	private int generateRandomIndex() {
+		int random = (int)(Math.random() * ChangeUtil.change.length);
+		return random;
+	}
+}

src/main/java/com/softwriters/cashregister/service/FlatFileParserService.java

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+package com.softwriters.cashregister.service;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.math.BigDecimal;
+import java.util.Scanner;
+
+public class FlatFileParserService {
+
+	public FlatFileParserService() {
+
+	}
+
+	public File processFile(File inputFile) throws IOException {
+
+		//Create Change Processing Service
+		ChangeProcessingService changeProcessor = new ChangeProcessingService();
+
+		//Scan in the input file
+		Scanner readFile = new Scanner(inputFile);
+
+		//Create an output file
+		File output = new File("output.txt");
+		output.createNewFile();
+
+		//Create a file writer to write to output file
+		FileWriter fileWriter = new FileWriter("output.txt");
+		//While the scanner sees new tokens
+		while(readFile.hasNext()) {
+
+			//Grab the next String token and split using a delimiter
+			String currentString = readFile.next();
+			String[] values = currentString.split(",");
+
+			//Convert two numbers to double values
+			BigDecimal totalDue = new BigDecimal(values[0]);
+			BigDecimal paid = new BigDecimal(values[1]);
+
+			//Write change due strings to the file 
+			if(isDivisibleByThree(values[0])) {
+				fileWriter.write("\n"+changeProcessor.calculateRandomChange(totalDue, paid));
+			}
+			else {
+				fileWriter.write("\n"+changeProcessor.calculateChange(totalDue, paid));
+			}
+
+			//If more input in file, go to next line
+			if(readFile.hasNextLine()) {
+				readFile.nextLine();
+			}
+		}
+
+		//close scanner and writer
+		fileWriter.close();
+		readFile.close();
+
+		return output;
+	}
+
+
+	private boolean isDivisibleByThree(String totalDue) {
+
+		int sumOfDigits = 0;
+		//Add each digit in the string
+		for(int i = 0;i<totalDue.length();i++) {
+
+			if(totalDue.charAt(i)!='.') {
+				sumOfDigits += (int)totalDue.charAt(i) - '0'; 
+			}
+		}
+
+		//if the sum mod 3 equals 0 then it is divisible by 3
+		if(sumOfDigits%3==0) {
+			return true;
+		}
+		else {
+			return false;
+		}
+
+	}
+}