Lab 10 - IO & Exception

import java.util.*;
import java.io.*;

public class HitungIP {
    public static String path;

    public static int bacaBaris() throws IOException{
        FileReader bacaFile = new FileReader(path);
        BufferedReader bacaBuffer = new BufferedReader(bacaFile);

        String baris;
        int jumlahBaris = 0;

        //looping baca baris
        while ((baris = bacaBuffer.readLine()) != null){
            jumlahBaris++;
        }

        bacaBuffer.close();

        return jumlahBaris;
    }

    public static String[] OpenFile() throws IOException{
        FileReader fr = new FileReader(path);
        BufferedReader textReader = new BufferedReader(fr);

        int jumlahBaris = bacaBaris();
        String[] textData = new String[jumlahBaris];

        int i;

        for (i=0;i<jumlahBaris;i++){
            textData[i] = textReader.readLine();
        }

        textReader.close();
        return textData;
    }

    // Method untuk menghitung nilai IP
    public static double hitungIP(double NilaiTotal, double SKS){
        double nilaiIP = 0;

        try {
            nilaiIP = NilaiTotal/SKS;
        }
        catch (Exception e) {
        }
        return nilaiIP;
    }

    public static void CetakFile(List<String> content, String Tipe){
        File file = null;

        if (Tipe == "lulus") {
            file = new File("D:/ddp/lulus.txt");
        }
        else if (Tipe == "tidakLulus"){
            file = new File("D:/ddp/tidakLulus.txt");
        }
        else if (Tipe == "error"){
            file = new File("D:/ddp/error.txt");
        }

        System.out.println("");
        System.out.println("Membuat file " + Tipe + ".txt");
        System.out.println("...");

        try{
            // kalau belum ada filenya, buat lah
            if (!file.exists()) {
                file.createNewFile();
            }

            FileWriter fw = new FileWriter(file.getAbsoluteFile());
            BufferedWriter bw = new BufferedWriter(fw);

            for(int i=0;i<content.size();i++){
                bw.write(content.get(i));
                bw.newLine();
            }

            bw.close();

            System.out.println("Berhasil!");
        }
        catch(IOException e){
            e.printStackTrace();
        }
    }

    public static boolean isNumeric(String str){
        try{
            double d = Double.parseDouble(str);
        }
        catch(NumberFormatException nfe){
            return false;
        }
        return true;
    }

    public static boolean CekError(String Tipe, String zNilaiTotal, String zSKS, double zIP){
        //- Nilai total atau jumlah SKS bukan merupakan bilangan
        //- Jumlah SKS melebihi 25 atau bukan bilangan bulat
        //- Nilai IP melebihi 4 (Dipastikan input tidak negatif)

        boolean isError = true;

        if (Tipe == "NilaiTotalSKS"){
            if (isNumeric(zNilaiTotal) == true) { //Nilai Total merupakan bilangan
                if (isNumeric(zSKS) == true) { //SKS merupakan bilangan
                    //if (zSKS.matches("[0-9]*")){ //SKS merupakan bilangan bulat
                        if (Double.parseDouble(zNilaiTotal) >= 0){ //Nilai Total tidak boleh minus
                            if (Double.parseDouble(zSKS) <= 25 && Double.parseDouble(zSKS) >= 0){ //SKS antara 0 s/d 25
                                isError = false;
                                //DEBUG System.out.println("bilangan");
                            }
                        }
                    //}
                }
            }
        }
        else if (Tipe == "IP"){
            if (zIP <= 4 && zIP > 0){
                isError = false;
            }
        }

        return isError;
    }

    public static void main(String[] args){
        String file_path = "D:/ddp/";
        String file_name;
        String inputFileName = ".txt";
        String[] tahunAjaran;
        int ajaranAwal = 0;
        int ajaranAkhir = 0;
        boolean isTahunAjaranValid = false;
        String[] dataMahasiswa;
        double IP = 0;
        //String[] contentLulus = new String[];
        List<String> contentLulus = new ArrayList<String>();
        List<String> contentTidakLulus = new ArrayList<String>();
        List<String> contentError = new ArrayList<String>();
        boolean isError = false;

        try{
            // Minta nama file input.
            Scanner scan = new Scanner(System.in);
            System.out.print("Input file: ");
            inputFileName = scan.next();

            inputFileName = inputFileName + ".txt";
            file_name = file_path + inputFileName;

            // Buka file input.
            path = file_name;
            String[] aryLines = OpenFile();


            for(int i=0;i<aryLines.length;i++){
            //DEBUG System.out.println(aryLines[i]);

            }

            // Baca baris pertama yang berisi tahun ajaran.
            /* DEBUG
            System.out.println("");
            System.out.println("Tahun Ajaran: " + aryLines[0]);
            */
            tahunAjaran = aryLines[0].split("/");

            // Lakukan validasi tahun ajaran
            ajaranAwal = Integer.parseInt(tahunAjaran[0]);
            ajaranAkhir = Integer.parseInt(tahunAjaran[1]);

            if ((ajaranAkhir-ajaranAwal) == 1){
                //DEBUG System.out.println("Tahun Ajaran valid...");
                isTahunAjaranValid = true;
            }
            else  {
                System.out.println("Tahun Ajaran tidak valid...");
            }

            // throw exception anda sendiri kalau terjadi error
            // while loop untuk memproses data dari file

            if (isTahunAjaranValid == true){
                //DEBUG System.out.println("");
                int iDetail=1;
                int iLulus = 1;
                int iGagal = 1;
                int iError = 1;
                contentLulus.clear();
                contentTidakLulus.clear();
                contentError.clear();

                while (iDetail<aryLines.length){
                    //DEBUG System.out.println("");
                    dataMahasiswa = aryLines[iDetail].split(" ");

                    for (int i=0;i< dataMahasiswa.length;i++){
                        //DEBUG System.out.println(dataMahasiswa[i]);
                    }

                    isError = CekError("NilaiTotalSKS", dataMahasiswa[1], dataMahasiswa[2], 0);

                    if(isError == false){
                        IP = hitungIP(Double.parseDouble(dataMahasiswa[1]),Integer.parseInt(dataMahasiswa[2]));

                        isError = CekError("IP", "", "", IP);
                        if(isError == false){
                            if (IP >= 1.75){
                                //DEBUG System.out.println("lulus");
                                contentLulus.add(aryLines[iDetail]);
                                iLulus++;
                            }
                            else if(IP < 1.75){
                            //DEBUG System.out.println("tidak lulus");
                            contentTidakLulus.add(aryLines[iDetail]);
                            iGagal++;
                            }
                        }
                        else if (isError == true){
                            System.out.println("error IP");
                            contentError.add(aryLines[iDetail]);
                            iError++;
                        }
                    }
                    else if (isError == true){
                        System.out.println("Telah terjadi error!");
                        contentError.add(aryLines[iDetail]);
                        iError++;
                    }

                    iDetail++;
                }

                if (iLulus>1){
                    CetakFile(contentLulus, "lulus");
                }

                if (iGagal>1){
                    CetakFile(contentTidakLulus, "tidakLulus");
                }

                if (iError>1){
                    CetakFile(contentError, "error");
                }
            }
        }
        catch (IOException e) {
            System.out.println("");
            System.out.println(e.getMessage());
            System.out.println("File Not Found");
            System.out.println("Pastikan file " + inputFileName + " ada di directory D:\ddp");
        }

        catch (ArrayIndexOutOfBoundsException AIOoBE) {
            System.out.println("tidak ada sks");
        }

        catch (NumberFormatException NFE ) {
            System.out.println("sks pake koma");
        }
        //catch (. . . ) {
        //}
        //}
        }
}