2020-05-28_JAVA_HW9_FileIO

import java.util.*;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

public class Database
{
    private List<Item> items;

    public boolean read(String file_pos) throws IOException
    {
        List<Item> ans=null;
        try {
            InputStreamReader file = new InputStreamReader(new FileInputStream(file_pos));//檔案讀取路徑
            BufferedReader reader = new BufferedReader(file);
            String line = null;
            Item newitem=null;
            while((line=reader.readLine())!=null){//分行讀取
                String item[] = line.split(",");//分割
                switch(item[0])
                {
                    case "CD":
                        newitem=new CD(item[1], item[2], Integer.parseInt(item[3]), Integer.parseInt(item[4]), Integer.parseInt(item[5]));
                        break;
                    case "BoardGame":
                        break;
                    case "DVD":
                        break;
                    case "eBook":
                        break;
                    case "Game":
                        break;
                    case "Item":
                        break;
                    case "VideoGame":
                        break;
                }
                /*String  data1= item[0].trim();
                String  data2= item[1].trim();
                String  data3= item[2].trim();*/
                items.add(newitem);
            }
            file.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }
        return true;
    }
    /*
    public boolean save(String file_pos,List<Item> data) throws IOException
    {
        try {
            InputStreamReader file = new InputStreamReader(new FileInputStream(file_pos));//檔案讀取路徑
            BufferedReader reader = new BufferedReader(file);
            BufferedWriter bw = new BufferedWriter(new FileWriter(file_pos));//檔案輸出路徑
            String line = null;
            while((line=reader.readLine())!=null){//分行讀取
                String item[] = line.split(",");//分割
                switch(item[0])
                {
                    case "CD":
                        break;
                    case "BoardGame":
                        break;
                    case "DVD":
                        break;
                    case "eBook":
                        break;
                    case "Game":
                        break;
                    case "Item":
                        break;
                    case "VideoGame":
                        break;
                }
                 while((line=reader.readLine())!=null){
                        String item[] = line.split(",");
            }
            //bw.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }
        return true;
    }*/

    public Database()
    {
        items = new ArrayList<>();
    }

    public void addItem(Item theItem)
    {
        items.add(theItem);
    }

    public void list()
    {
        for(Item item : items)
            item.print();
    }

    public static void main(String args[]) throws IOException
    {
        String file_pos="./save.csv";
        Database d1 = new Database();
        d1.read(file_pos);
        d1.addItem(new CD("newCD","artest",3,3,1000));
        d1.addItem(new eBook("newebook","author",100));
        d1.addItem(new DVD("newDVD","director",180,250));
        d1.addItem(new VideoGame("Videogame", 1920, 1, "RStar", 18, null, true));
        d1.addItem(new BoardGame("BoardGame", 320, 4, null, 8, null));
        d1.list();
        Collections.sort(d1.items);
        System.out.println("\nafter sort...\n");
        d1.list();
    }
}