CS448/Projects/cs448_project_1/src/main/java/cs448/project1.java

package cs448;

import org.mapdb.DB;
import org.mapdb.DBMaker;
import org.mapdb.Serializer;

import java.io.IOException;
import java.util.Dictionary;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Scanner;
import java.util.concurrent.ConcurrentMap;
import java.io.File;
import java.lang.StringBuilder;

/**
 * A class to compare different storage backends.
 *
 * @author Sean Rettig
 * @version January 22, 2024
 */


public class project1 {

    /* Data structure for Main-memory back-end */
    HashMap<String,Dictionary<String, String>> mm_map = new HashMap<String,Dictionary<String, String>>();

    /* Data structure for MapDB persistent storage*/
    String dbfile = "data.db";
    DB db = DBMaker.fileDB(dbfile).make();

    // use this for MapDB storage
    ConcurrentMap mapdb = db.hashMap("map").make();

    void load_mainmemory(String file_path) throws IOException {
        Scanner sc = new Scanner((new File(file_path)));
        String line = "";

        while (sc.hasNextLine()) {
            line = sc.nextLine();
            String[] row = line.split("\t");

            Dictionary<String, String> row_dict = new Hashtable<>();

            row_dict.put("primaryName", row[1]);
            row_dict.put("birthYear", row[2]);
            row_dict.put("deathYear", row[3]);
            row_dict.put("primaryProfession", row[4]);
            row_dict.put("knownForTitles", row[5]);

            mm_map.put(row[0], row_dict);
        }
    }

    void load_mapdb(String file_path) throws IOException{
        Scanner sc = new Scanner((new File(file_path)));
        String line = "";

        while (sc.hasNextLine()) {
            line = sc.nextLine();
            String[] row = line.split("\t");

            Dictionary<String, String> row_dict = new Hashtable<>();

            row_dict.put("primaryName", row[1]);
            row_dict.put("birthYear", row[2]);
            row_dict.put("deathYear", row[3]);
            row_dict.put("primaryProfession", row[4]);
            row_dict.put("knownForTitles", row[5]);

            mapdb.put(row[0], row_dict);
        }
    }

    String select_file(String file_path, String key, String[] column_names) throws IOException{
        Scanner sc = new Scanner(new File(file_path));
        String line = "";

        while (sc.hasNextLine()) {
            line = sc.nextLine();
            if (line.contains(key)) {
                sc.close();
                break;
            }
        }
        
        if (line != "") {
            String[] row = line.split("\t");

            StringBuilder sb = new StringBuilder();
            for (String col_name : column_names) {
                switch (col_name) {
                    case "nconst":
                        sb.append(row[0]);
                        break;
                    
                    case "primaryName":
                        sb.append(row[1]);
                        break;

                    case "birthYear":
                        sb.append(row[2]);
                        break;

                    case "deathYear":
                        sb.append(row[3]);
                        break;
                    
                    case "primaryProfession":
                        sb.append(row[4]);
                        break;
                    
                    case "knownForTitles":
                        sb.append(row[5]);
                        break;
                    
                    default:
                        break;
                }
                sb.append("\t");
            }
            line = sb.toString();
            
        }
        return line;
    }

    String select_mainmemory(String key, String[] column_names){
        StringBuilder sb = new StringBuilder();
        Dictionary<String, String> data = mm_map.get(key);
        for (String col_name : column_names) {
            if (col_name == "nconst") {
                sb.append(key);
            } else {
                sb.append(data.get(col_name));
            }
            sb.append("\t");
        }
        return sb.toString();
    }
    
    String select_mapdb(String key, String[] column_names){
        StringBuilder sb = new StringBuilder();
        Dictionary<String, String> data = (Dictionary<String, String>) mapdb.get(key);
        for (String col_name : column_names) {
            if (col_name == "nconst") {
                sb.append(key);
            } else {
                sb.append(data.get(col_name));
            }
            sb.append("\t");
        }
        return sb.toString();
    }

    int fastestLoad(){
        // 1: Main-memory Load
        // 2: MapDB Load
        int fastest = 1;
        return fastest;
    }

    int fastestSelect(){
        // 0: File Select
        // 1: Main-memory Select
        // 2: MapDB Select
        int fastest = 1;
        return fastest;
    }
}