PhoneBook.java

package com.zipcodewilmington.phonebook;

import java.util.*;
//import java.util.HashMap;


/**
 * Created by leon on 1/23/18.
 * Made WAY better by kristofer 6/16/20
 */



public class PhoneBook {

    private Map<String, List<String>> phonebook = new LinkedHashMap<>();
    private List<String> telephoneNumbers = new ArrayList<>();

    //private final Map<String, List<String>> phonebook;

   public PhoneBook(Map<String, List<String>> phonebookMap) {
        this.phonebook = phonebookMap;
    }



    public PhoneBook() {
       // this(null);
    }

    public void add(String name, String phoneNumber) {
        telephoneNumbers.add(phoneNumber);
        phonebook.put(name, telephoneNumbers);
    }

    public void addAll(String name, String... phoneNumbers) {
        telephoneNumbers.addAll(Arrays.asList(phoneNumbers));
       // assert phonebook != null;
        phonebook.put(name, telephoneNumbers);
    }

    public void remove(String name) {
       phonebook.remove(name);

    }

    public Boolean hasEntry(String name) {

        return phonebook.containsKey(name);

    }
    public Boolean hasEntry(String name, String phoneNumber) {
        phonebook.containsValue(phoneNumber);
         return phonebook.containsKey(name);
   }



    public List<String> lookup(String name) {
        return phonebook.get(name);
    }

    public String reverseLookup(String phoneNumber)  {
        List<String> contactNames =getAllContactNames();
        List<String> numbers;
       for(String name : contactNames) {
           numbers = phonebook.get(name);
           for (String number : numbers) {
               if (number == phoneNumber) {
                  return name;
               }
           }
       }

       return null;
    }

    public List<String> getAllContactNames() {
       List<String> contactNames = new ArrayList<>();
        for (String key : phonebook.keySet()) {
            contactNames.add(key);
        }
        return contactNames;
    }

    public Map<String, List<String>> getMap() {
        return phonebook;
    }
}