GauravChaddha1996

package com.pokemonify.pokemonify.recyclerviewcomponents;

import android.content.Context;
import android.support.annotation.Nullable;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

/**

GauravChaddha1996

/*
 * Copyright (c) 2016 Gaurav Chaddha
 *
 * The MIT License (MIT)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 * and associated documentation files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:

GauravChaddha1996

Information is taken from : [Journal Dev Java Design Pattern Example Tutorial] (http://www.journaldev.com/1827/java-design-patterns-example-tutorial)

#Creational Design Patterns ###Patterns to use when an object is being instantiated

1. Singleton Pattern : Used when we want only one instance of a class. Implement using a static inner class with a private final outer class object for confirmed single instance.

2. Factory Pattern : Used when parent class has many sub class and we want an object of those classes. Implement it using a factory class which uses if elseif code for returning sub class object based on some condition and cast it to parent class (Dynamic Run time overriding)

3. Abstract Factory Pattern : Usage same as factory to remove if checks. Implement it by making abstract factory class and then its impl of base class, and all subclasses. The base class abstract impl should accept values from sub class abstract impl.

GauravChaddha1996

class Model {
    UserModelHelper userModel;
    RecipeModelHelper recipeModel;
    NetworkManager networkManager;
    /*
    Make the constructor here and initialize the model helpers   
    like UserModel and other managers
    */
   
    /* Checks if the account is premium or not. Throws an 

GauravChaddha1996

class RecipeView {
// Lifecycle and other instantiation events.

/*
updateUI function is called with RecipeData object 
holding the list to be shown 
*/
void updateUI(RecipeData data) {
    if (data.getError()) {
      // show upgrade dialog.

GauravChaddha1996

class RecipePresenter {
  Model model;
  View view;
  List<Recipe> list;
  RecipeData data;
  // Make the constructor here and initialize the model and view
  
  /* First and second role of presenter- asking model for data  
  on button click. Caching the recipes in 'data' variable and 
  then sending the results back */

GauravChaddha1996

class MyPresenter {
    private MyViewInterface viewInterface;
    private DataManager dataManager;
    private MyState state;
    
    MyPresenter(DataManager dataManager) {
        this.dataManager = dataManager;
        /* Initiates state with a default value for the initial UI 
           of this view */
        state = new MyState("This is the template data");

GauravChaddha1996

interface MyViewInterface {
        /* MyState class is a class which contains all the data needed 
        to display the UI of the said activity. */
        void updateUI(MyState state);
}

GauravChaddha1996

class MainLoader extends Loader<MainPresenter> {
    private MainPresenter presenter;

    /*  When the loader is being created, we instantiate the
        presenter also and keep it's object as private */
    MainLoader(Context context, MainPresenter presenter) {
        super(context);
        this.presenter = presenter;
    }

GauravChaddha1996

public class MainActivity extends AppCompatActivity implements MainViewInterface,
  LoaderManager.LoaderCallbacks<MainPresenter> {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      // start the loader to load the presenter

      /* 1001 is a unique loader id through which system manages