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Create ExportsCSVReading.java
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‎(1) Java Programming: Solving Problems with Software/Week 3/Programs/(3)ExportsCSV/ExportsCSVReading.java‎

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//Reading and printing of CSV File consiting data related to Countries Export and its value
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//GUI (Graphical User Interface based program)
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//NOTE : Take care of the file and package name and make sure the csv file location is set
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/*
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* Coder : Phantom-fs
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*/
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package ExportsCSV;
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//This is an external library, use steps in CSV README.md file to know how to add it
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import org.apache.commons.csv.*;
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import org.jetbrains.annotations.Nullable;
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import java.io.*;
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import java.util.*;
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public class ExportsCSVReading
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{
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String nl = System.lineSeparator();
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static int count = 0;
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//the method to create CSV parser and read the CSV file
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public static @Nullable CSVParser readCSV()
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{
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try
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{
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//location of the CSV file, change it according to your usage
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FileReader fileReader = new FileReader("B:\\3- Java Programs\\IdeaProjects\\CSVData\\CSV Files\\exports\\exportdata.csv");
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//inline variable, returning the parser to whichever method called it
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return new CSVParser(fileReader, CSVFormat.DEFAULT.withFirstRecordAsHeader().withIgnoreHeaderCase().withTrim());
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}
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catch (IOException e)
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{
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throw new RuntimeException(e);
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}
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catch (Exception e)
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{
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System.out.println("Error");
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}
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return null;
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}
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public void printFullCSV ()
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{
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try
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{
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Styling.lineTitle("Countries, their exports and export value : ");
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//the CSVParser object is returned from the readCSV() method, thus not recreating multiple times
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//Objects.requireNonNull() to make sure that the csvParser object is not null
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for (CSVRecord csvRecord : Objects.requireNonNull(readCSV()))
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{
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Styling.color("Country - " + csvRecord.get("Country"), "red");
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Styling.color("Exports - " + csvRecord.get("Exports"), "purple");
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Styling.color("Value (dollars) - " + csvRecord.get("Value (dollars)"), "blue");
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Styling.line();
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}
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}
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catch (Exception e)
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{
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System.out.println("Error");
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}
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}
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public void printCountryAndExports ()
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{
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try
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{
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Styling.lineTitle("Countries and their exports : ");
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for (CSVRecord csvRecord : Objects.requireNonNull(readCSV()))
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{
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Styling.color("Country - " + csvRecord.get("Country"), "red");
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Styling.color("Exports - " + csvRecord.get("Exports"), "purple");
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Styling.line();
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}
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}
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catch (Exception e)
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{
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System.out.println("Error");
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}
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}
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public void printCountryAndValue ()
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{
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try
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{
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Styling.lineTitle("Countries and their export value : ");
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for (CSVRecord csvRecord : Objects.requireNonNull(readCSV()))
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{
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Styling.color("Country - " + csvRecord.get("Country"), "red");
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Styling.color("Value (dollars) - " + csvRecord.get("Value (dollars)"), "blue");
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Styling.line();
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}
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}
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catch (Exception e)
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{
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System.out.println("Error");
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}
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}
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public void printCountries ()
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{
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try
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{
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Styling.lineTitle("Countries : ");
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for (CSVRecord csvRecord : Objects.requireNonNull(readCSV()))
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{
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Styling.colorTB(csvRecord.get("Country"), "red");
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//after every 5 countries, a new line is printed
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if (csvRecord.getRecordNumber() % 5 == 0)
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System.out.println();
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}
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Styling.line();
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}
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catch (Exception e)
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{
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System.out.println("Error");
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}
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}
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public void printExportOfInterest (String export)
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{
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count = 0;
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try
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{
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Styling.lineTitle("Countries that export " + export + " : ");
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for (CSVRecord csvRecord : Objects.requireNonNull(readCSV()))
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{
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if (csvRecord.get("Exports").contains(export))
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{
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Styling.colorTB(csvRecord.get("Country"), "red");
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count++;
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//newline after every 5 countries
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if (count % 5 == 0)
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System.out.println();
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}
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}
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Styling.line();
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}
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catch (Exception e)
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{
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System.out.println("Error");
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}
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}
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public void exportsByCountry (String country)
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{
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try
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{
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Styling.lineTitle("Exports of " + country + " : ");
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for (CSVRecord csvRecord : Objects.requireNonNull(readCSV()))
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{
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if (csvRecord.get("Country").equals(country))
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{
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Styling.color(csvRecord.get("Exports"), "purple");
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Styling.line();
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}
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}
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}
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catch (Exception e)
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{
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System.out.println("Error");
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}
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}
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public void exportsValueByCountry (String country)
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{
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try
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{
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Styling.lineTitle("Export Value of " + country + " : ");
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for (CSVRecord csvRecord : Objects.requireNonNull(readCSV()))
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{
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if (csvRecord.get("Country").equals(country))
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{
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Styling.color(csvRecord.get("Value (dollars)"), "purple");
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Styling.line();
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}
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}
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}
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catch (Exception e)
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{
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System.out.println("Error");
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}
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}
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public void exportsByValue (String value)
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{
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count = 0;
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try
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{
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Styling.lineTitle("Countries whose export value is more than $" + value + " : ");
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for (CSVRecord csvRecord : Objects.requireNonNull(readCSV()))
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{
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String valueStr = csvRecord.get("Value (dollars)");
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if(valueStr.length() > 0)
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{
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//removing the commas and $ sign from the value string
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valueStr = valueStr.replaceAll(",", "").replace("$", "").replace(" ", "");
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//converting the string to long
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long valueStrInt = Long.parseLong(valueStr);
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//converting the string to long
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long valueUser = Long.parseLong(value);
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if (valueStrInt > valueUser)
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{
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Styling.colorTB(csvRecord.get("Country"), "red");
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count++;
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//newline after every 5 countries
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if (count % 5 == 0)
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System.out.println();
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}
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}
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}
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Styling.line();
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}
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catch (NumberFormatException e)
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{
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System.out.println("Error");
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}
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}
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public void printSomeImportantExports ()
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{
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count = 0;
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try
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{
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String[] impExports = new String[21];
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impExports[0] = "crude oil";
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impExports[1] = "petroleum";
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impExports[2] = "gold";
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impExports[3] = "diamonds";
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impExports[4] = "copper";
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impExports[5] = "iron ore";
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impExports[6] = "silver";
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impExports[7] = "tin";
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impExports[8] = "zinc";
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impExports[9] = "lead";
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impExports[10] = "nickel";
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impExports[11] = "aluminum";
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impExports[12] = "uranium";
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impExports[13] = "manganese";
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impExports[14] = "platinum";
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impExports[15] = "cotton";
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impExports[16] = "tea";
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impExports[17] = "coffee";
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impExports[18] = "sugar";
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impExports[19] = "cocoa";
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impExports[20] = "rubber";
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for (String impExport : impExports)
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{
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Styling.lineTitle("Countries that export " + impExport + " : ");
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for (CSVRecord csvRecord : Objects.requireNonNull(readCSV()))
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{
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if (csvRecord.get("Exports").contains(impExport))
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{
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Styling.colorTB(csvRecord.get("Country"), "purple");
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count++;
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//newline after every 5 countries
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if (count % 5 == 0)
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System.out.print(nl);
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}
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}
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}
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}
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catch (Exception e)
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{
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System.out.println("Error");
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}
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}
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public void someCalculations(int sizeEx)
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{
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try
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{
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//number of countries exporting more than n items
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int count = 0;
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//total value of exports
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long total = 0;
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int count2 = 0;
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//array of countries that satisfy the condition
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String[] countries = new String[250];
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for (CSVRecord csvRecord : Objects.requireNonNull(readCSV()))
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{
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String valueStr = csvRecord.get("Value (dollars)");
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String valueEx = csvRecord.get("Exports");
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if (valueStr.length() > 0 && valueEx.length() > 0)
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{
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//removing the commas and $ sign from the value string
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valueStr = valueStr.replaceAll(",", "").replace("$", "").replace(" ", "");
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//converting the string to long
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long valueStrInt = Long.parseLong(valueStr);
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//adding the value to the total
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total += valueStrInt;
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//splitting the export string and putting it in an array
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String[] exports = valueEx.split(",");
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//checking, if the number of exports is more than the size, as a country export is saved in this string, with each entry being an export item,
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//thus if the number of exports in the string is more than the size provide, then the country satisfies the condition, i.e. incrementing the count
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if (exports.length > sizeEx)
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{
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countries[count] = csvRecord.get("Country");
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count++;
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}
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}
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}
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Styling.lineTitle("Some calculations on complete data: ");
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Styling.color("Number of countries exporting more than " +sizeEx+ " items : " + count +nl, "red");
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Styling.color("Total value of exports : $" + total + nl, "purple");
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//printing the countries exporting more than n items
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Styling.color("Name of Countries exporting more than " + sizeEx + " items : "+nl, "red");
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for (int i = 0; i < 250; i++)
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{
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if(countries[i] != null)
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{
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Styling.colorTB(countries[i], "purple");
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count2++;
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//newline after every 5 countries
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if (count2 % 5 == 0)
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System.out.print(nl);
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}
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}
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}
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catch (Exception e)
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{
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System.out.println("Error");
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}
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}
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public static String removeNonDigits(final String str)
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{
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if (str == null || str.isEmpty())
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return str;
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < str.length(); i++)
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{
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char c = str.charAt(i);
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if (c >= '0' && c <= '9')
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sb.append(c);
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}
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return sb.toString();
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}
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}

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