ASDV-WebDev/Semester 3/Assignments/Json1/src/main/java/jason/JsonSupplier.java

package jason;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import jakarta.json.Json;
import jakarta.json.JsonArray;
import jakarta.json.JsonArrayBuilder;
import jakarta.json.JsonObject;
import jakarta.json.JsonObjectBuilder;
import jakarta.json.JsonReader;
import jakarta.json.JsonValue;
import jakarta.json.JsonWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.util.Scanner;

public class JsonSupplier {
    /**
     * Creates a JsonObject by traversing the arrayList of LinkedHashMap
     *
     * @param suppliers ArrayList of LinkedHashMap. Each element of the
     * arrayList is a row of suppliers table. The key of the LinkedHashMap is
     * the attribute name and the value of the attribute Example ( One liked
     * hash map is one row from the table) LinkedHashMap 1 : key: snumber,
     * value: s1 key: sname, value: white key: status, value: 20 key: city,
     * value London LinkedHashMap 2 : key: snumber, value: s2 key: sname, value:
     * black key: status, value: 30 key: city, value Paris The value of the map
     * @return JsonObject
     */
    public static JsonObject createJsonObjectForSuppliers(ArrayList< LinkedHashMap<String, String>> suppliers) {
        JsonObjectBuilder jsonBuilder = Json.createObjectBuilder();
        int counter = 1;
        for (LinkedHashMap<String, String> supplier : suppliers)
          {
            // create an array of key-value pairs
            JsonArrayBuilder arraySupplierBld = Json.createArrayBuilder();
            // create each key-value pair as seperate object and add it to the array
            Set<Map.Entry<String, String>> entrySet = supplier.entrySet();
            for (Map.Entry<String, String> entry : entrySet)
              {
                arraySupplierBld.add(Json.createObjectBuilder().add(entry.getKey(),
                        entry.getValue()).build());
              }
            // add supplier-array to object
            String objectID = "+" + (counter++);
            jsonBuilder.add(objectID, arraySupplierBld);
          }

        JsonObject allSuppliersJsonObject = jsonBuilder.build();
        return allSuppliersJsonObject;
    }

    /**
     * Creates a JsonObject by reading the String data in JSON format
     *
     * @param jsonData Json format data
     * @return JsonObject
     */
    public static JsonObject createJsonObjectFromString(String jsonData) {
        JsonReader jsonReader = Json.createReader(new StringReader(jsonData));
        JsonObject o = jsonReader.readObject();
        return o;
    }

    /**
     * Creates a LinkedHashMap of 4 ENTRYies.Keys name: snumber, sname, status
     * and city. Values of map are the parameters.
     *
     * @param snumber value of map
     * @param sname value of map
     * @param status value of map
     * @param city value of map
     * @return
     */
    public static LinkedHashMap<String, String> createMapOfSupplier(
            String snumber,
            String sname,
            String status,
            String city
    )
    {
        LinkedHashMap<String, String> mapSupplier
                = new LinkedHashMap<String, String>();
        mapSupplier.put("snumber", snumber);
        mapSupplier.put("sname", sname);
        mapSupplier.put("status", status);
        mapSupplier.put("city", city);

        return mapSupplier;
    }

    public static String getSuppliersJsonObject(){
        ArrayList< LinkedHashMap<String, String>> suppliers = new ArrayList();
        for (int i = 1; i <= 2; ++i)
          {
            LinkedHashMap<String, String> oneSupplierRowOfTable
                    = createMapOfSupplier(
                            "s1" + i,
                            "Johnson" + i,
                            Integer.toString(20 + i),
                            "london" + i);
            suppliers.add(oneSupplierRowOfTable);
          }

        JsonObject j = createJsonObjectForSuppliers(suppliers);
        return j.toString();
    }
    
    public static void main(String a[]) {
        ArrayList< LinkedHashMap<String, String>> suppliers = new ArrayList<>();
        for (int i = 1; i <= 2; ++i)
          {
            LinkedHashMap<String, String> oneSupplierRowOfTable
                    = createMapOfSupplier(
                            "s1" + i,
                            "Johnson" + i,
                            Integer.toString(20 + i),
                            "london" + i);
            suppliers.add(oneSupplierRowOfTable);
          }

        JsonObject j = createJsonObjectForSuppliers(suppliers);

        StringWriter strWtr = new StringWriter();
        JsonWriter jsonWtr = Json.createWriter(strWtr);
        jsonWtr.writeObject(j);
        String s = strWtr.toString();
        System.out.println(s);
        jsonWtr.close();
        /*
        JSONobj.readJASONdataUsingParser(strWtr.toString());

        JsonObject o = createJsonObjectFromString(strWtr.toString());
        System.out.println("------------------------------------------------");
        JSONobj.writeObjectModelToStream(o);
         */
    }
        public static void writeJsonToTextFile(JsonObject jo) throws FileNotFoundException {
        String jsonString = Jason.getJsonString(jo);
        PrintWriter output = new PrintWriter(new FileOutputStream("jason.json", true));
        output.print(jsonString);
        output.close();
    }
        public static JsonObject readFileIntoJson(String fileName) throws FileNotFoundException {
            File file = new java.io.File(fileName);
            Scanner input = new Scanner(file);
            String joString = "";
            while (!input.hasNext()) {
                joString += input.next();
            }
            input.close();
            JsonObject jo = createJsonObjectFromString(joString);
            return jo;
        }
}