package decorator;
public interface LoginComponent {
   void login(String user, String password);
}

package decorator;
public class BasicLoginComponent implements LoginComponent {
   @Override
   public void login(String user, String password) {
       System.out.println("Basic login: " + user + ", " + password);
   }
}

package decorator;
public abstract class LoginDecorator implements LoginComponent {
   private final LoginComponent loginComponent;
   public LoginDecorator(LoginComponent loginComponent) {
       this.loginComponent = loginComponent;
   }
   @Override
   public void login(String user, String password) {
       loginComponent.login(user, password);
   }
}

package decorator;
public class MobileLoginDecorator extends LoginDecorator {
   public MobileLoginDecorator(LoginComponent loginComponent) {
       super(loginComponent);
   }
   @Override
   public void login(String user, String password) {
       System.out.println("Mobile login: " + user + ", " + password);
   }
}

package decorator;
public class CancelButtonDecorator extends LoginDecorator {
   public CancelButtonDecorator(LoginComponent loginComponent) {
       super(loginComponent);
   }
   public void cancel() {
       System.out.println("Click the cancel button");
   }
}

package decorator;
public class Main {
   public static void main(String[] args) {
   System.out.println("DECORATOR PATTERN");
   System.out.println("=================");
   // This is the basic login component
   LoginComponent loginComponent = new BasicLoginComponent();
   loginComponent.login("User", "PW");
   // Let's turn it into a mobile login component.
   loginComponent = new MobileLoginDecorator(loginComponent);
   loginComponent.login("User", "PW");
   // Finally, we can add a cancel functionality.
   loginComponent = new CancelButtonDecorator(loginComponent);
   ((CancelButtonDecorator) loginComponent).cancel();
   }
}

DECORATOR PATTERN
=================
Basic login: User, PW
Mobile login: User, PW
Click the cancel button

package pageobjects;
public class WebshopPage {
   public void search(final String queryString) {
       System.out.println("Enter " + queryString);
       System.out.println("Click search button");
   }
   public void checkResultHeadline() {
       System.out.println("Check if the headline is correct.");
   }
   public void checkResults() {
       System.out.println("Check if there are search results.");
   }
}

package pageobjects;
public class Main {
   public static void main(String[] args) {
   System.out.println("PAGE OBJECTS");
   System.out.println("============");
   WebshopPage webshopPage = new WebshopPage();
   webshopPage.search("T-Shirt");
   webshopPage.checkResultHeadline();
   webshopPage.checkResults();
   }
}

PAGE OBJECTS
============
Enter T-Shirt
Click search button
Check if the headline is correct.
Check if there are search results.

package pagecomponents;
public class SearchBar {
   public void search(final String queryString) {
       System.out.println("Enter " + queryString);
       System.out.println("Click search button");
   }
}

package pagecomponents;
public class ResultList {
   public void checkResultHeadline() {
       System.out.println("Check if the headline is correct.");
   }
   public void checkResults() {
       System.out.println("Check if there are search results.");
   }
}

package pagecomponents;
public class WebshopPage {
   public SearchBar searchBar() {
       return new SearchBar();
   }
   public ResultList resultList() {
       return new ResultList();
   }
}

package pagecomponents;
public class Main {
   public static void main(String[] args) {
   System.out.println("PAGE COMPONENTS");
   System.out.println("===============");
   WebshopPage webshopPage = new WebshopPage();
   webshopPage.searchBar().search("T-Shirt");
   webshopPage.resultList().checkResultHeadline();
   webshopPage.resultList().checkResults();
   }
}

PAGE COMPONENTS
===============
Enter T-Shirt
Click search button
Check if the headline is correct.
Check if there are search results.

package factory;
public class Component {
   public void initialize() {
       System.out.println("Initializing " + getClass().getName());
   }
}

public class ResultList extends Component {
    ...
}
public class SearchBar extends Component {
    ...
}

package factory;
public class ComponentFactory {
   public static Component getComponent(final String componentName) throws Exception {
   System.out.println("Creating " + componentName + "...");
   // Create a component instance for the passed in component name.
   Component component;
   switch (componentName){
       case "SearchBar":
           component = new SearchBar();
           break;
       case "ResultList":
           component = new ResultList();
           break;
       default:
           throw new Exception(componentName + " unknown.");
   }
   System.out.println("Component created: " + component);
   component.initialize();
   return component;
   }
}

package factory;
public class Main {
   public static void main(String[] args) throws Exception {
   System.out.println("FACTORY PATTERN");
   System.out.println("===============");
   WebshopPage webshopPage = new WebshopPage();
   webshopPage.searchBar().search("Berlin");
   }
}

FACTORY PATTERN
===============
Creating SearchBar...
Component created: factory.SearchBar@3d075dc0
Initializing factory.SearchBar
Enter Berlin
Click search button

package dependencyinjection;
public interface LoginData {
   String getUserName();
   String getPassword();
}

package dependencyinjection;
public class LoginDataReal implements LoginData {
   @Override
   public String getUserName() {
       return "Real user";
   }
   @Override
   public String getPassword() {
       return "Real password";
   }
}
package dependencyinjection;
public class LoginDataFake implements LoginData {
   @Override
   public String getUserName() {
       return "Fake user";
   }
   @Override
   public String getPassword() {
       return "Fake password";
   }
}

package dependencyinjection;
public class LoginPage {
   private final LoginData loginData;
   public LoginPage(final LoginData loginData) {
       this.loginData = loginData;
   }
   public void login(){
       System.out.println("Logging in with " + loginData.getClass());
       System.out.println("- user: " + loginData.getUserName());
       System.out.println("- password: " + loginData.getPassword());
   }
}

package dependencyinjection;
public class Main {
   public static void main(String[] args) {
   System.out.println("DEPENDENCY INJECTION");
   System.out.println("====================");
   LoginPage loginPageReal = new LoginPage(new LoginDataReal());
   loginPageReal.login();
   LoginPage loginPageFake = new LoginPage(new LoginDataFake());
   loginPageFake.login();
   }
}

DEPENDENCY INJECTION
====================
Logging in with class dependencyinjection.LoginDataReal
user: Real user
password: Real password
Logging in with class dependencyinjection.LoginDataFake
user: Fake user
password: Fake password