Provider.cs

using System;
using System.Collections;
public enum ProviderType {

  INDIVIDUAL = 0,
  ORGANIZATION = 1,
  PURCHASED = 2
}

public class Provider {

  private int providerid = Guid.NewGuid().ToString()
  private String sname;
  private ProviderType type;
  private ArrayList inv = new ArrayList();

  public Provider(String sname, String type)
  {
    id = providerid;
    this.sname = sname;
    if(type.equals("organization"))
    {
      this.type = ProviderType.ORGANIZATION;
    }
    else {
      this.type = ProviderType.INDIVIDUAL;
    }
  }
  public ArrayList<string> getInfo(){
    ArrayList provider = new ArrayList<string>();
    provider.add(this.id.toString());
    provider.add(this.sname);
    provider.add(this.type.sname());
    return provider;
  }
//Provider adding Item to the inventory
  public void addItem(Item item){
    Guid guid = Guid.NewGuid();
    string item = guid.ToString();

    ArrayList<Item> itemList = donatedSold.computeIfAbsent(item.getCode(), k -> new ArrayList<>());
    itemList.add(item);
  }

  // check if item is PLU or not, using safe operation
  public boolean isItemPlu(boolean itemType){
    return Boolean.TRUE.equals(itemType);
  }


  public String getType(boolean plu){
    if(plu){
      return "PLU";
    }
    else{
      return "UPC";
    }
  }

  }