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done email_notifier_example
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‎structural_design_pattern/decorator/email_notifier_example/README.md

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# Email Notifier Example
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## With Decorator
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<img src = "../assets/Decorator_Design_Pattern_UML.jpg" >
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```dart
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abstract class Notifier {
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void notify();
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}
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class EmailNotifier implements Notifier {
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String _email;
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EmailNotifier(String email) : _email = email;
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@override
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void notify() => print("Sending email to: $_email \n");
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}
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class NotifierDecorator implements Notifier {
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Notifier _notifier;
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NotifierDecorator(Notifier notifier) : _notifier = notifier;
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Notifier get notifier => _notifier;
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set notifier(Notifier notifier) => _notifier = notifier;
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notify() => _notifier.notify();
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}
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class SMSNotifierDecorator extends NotifierDecorator {
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String _phoneNumber;
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SMSNotifierDecorator(Notifier notifier, String phoneNumber)
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: _phoneNumber = phoneNumber,
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super(notifier);
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@override
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void notify() {
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super.notify();
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_sendSMS();
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}
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void _sendSMS() => print("Sending SMS to $_phoneNumber \n");
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}
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class WhatsAppNotifierDecorator extends NotifierDecorator {
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String _phoneNumber;
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WhatsAppNotifierDecorator(Notifier notifier, String phoneNumber)
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: _phoneNumber = phoneNumber,
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super(notifier);
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@override
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void notify() {
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super.notify();
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_sendSMS();
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}
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void _sendSMS() => print("Sending WhatsApp message to $_phoneNumber \n");
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}
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void main(List<String> args) {
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bool isSmsNotificationEnabled = true;
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bool isWhatsAppNotificationEnabled = true;
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Notifier notifier = EmailNotifier("[email protected]");
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if (isSmsNotificationEnabled) {
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notifier = SMSNotifierDecorator(notifier, "01000");
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}
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if (isWhatsAppNotificationEnabled) {
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notifier = WhatsAppNotifierDecorator(notifier, "01000");
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}
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notifier.notify();
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}
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```
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## Without Decorator
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```dart
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abstract class Notifier {
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void notify();
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}
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class EmailNotifier implements Notifier {
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String _email;
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EmailNotifier(String email) : _email = email;
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@override
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void notify() => print("Sending email to: $_email \n");
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}
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// the Phone Notifiers using whats app or sms
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abstract class PhoneNotifier implements Notifier {
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String _phoneNumber;
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PhoneNotifier(String phoneNumber) : _phoneNumber = phoneNumber;
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}
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class SMSNotifier extends PhoneNotifier {
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SMSNotifier(String phoneNumber) : super(phoneNumber);
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@override
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void notify() => print("Sending SMS to $_phoneNumber \n");
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}
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class WhatsAppNotifier extends PhoneNotifier {
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WhatsAppNotifier(String phoneNumber) : super(phoneNumber);
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@override
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void notify() => print("Sending WhatsApp message to $_phoneNumber \n");
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}
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void main(List<String> args) {
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bool isSmsNotificationEnabled = true;
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bool isWhatsAppNotificationEnabled = true;
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Notifier emailNotifier = EmailNotifier("[email protected]");
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emailNotifier.notify();
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if (isSmsNotificationEnabled) {
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Notifier sMSNotifier = SMSNotifier("01000");
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sMSNotifier.notify();
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}
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if (isWhatsAppNotificationEnabled) {
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Notifier whatsAppNotifier = WhatsAppNotifier("01000");
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whatsAppNotifier.notify();
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}
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}
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```

‎structural_design_pattern/decorator/email_notifier_example/email_notifier_decorator_example.dart

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abstract class Notifier {
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void notify();
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}
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class EmailNotifier implements Notifier {
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String _email;
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EmailNotifier(String email) : _email = email;
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@override
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void notify() => print("Sending email to: $_email \n");
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}
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class NotifierDecorator implements Notifier {
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Notifier _notifier;
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NotifierDecorator(Notifier notifier) : _notifier = notifier;
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Notifier get notifier => _notifier;
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set notifier(Notifier notifier) => _notifier = notifier;
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notify() => _notifier.notify();
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}
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class SMSNotifierDecorator extends NotifierDecorator {
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String _phoneNumber;
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SMSNotifierDecorator(Notifier notifier, String phoneNumber)
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: _phoneNumber = phoneNumber,
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super(notifier);
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@override
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void notify() {
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super.notify();
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_sendSMS();
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}
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void _sendSMS() => print("Sending SMS to $_phoneNumber \n");
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}
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class WhatsAppNotifierDecorator extends NotifierDecorator {
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String _phoneNumber;
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WhatsAppNotifierDecorator(Notifier notifier, String phoneNumber)
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: _phoneNumber = phoneNumber,
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super(notifier);
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@override
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void notify() {
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super.notify();
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_sendSMS();
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}
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void _sendSMS() => print("Sending WhatsApp message to $_phoneNumber \n");
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}
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void main(List<String> args) {
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bool isSmsNotificationEnabled = true;
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bool isWhatsAppNotificationEnabled = true;
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Notifier notifier = EmailNotifier("[email protected]");
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if (isSmsNotificationEnabled) {
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notifier = SMSNotifierDecorator(notifier, "01000");
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}
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if (isWhatsAppNotificationEnabled) {
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notifier = WhatsAppNotifierDecorator(notifier, "01000");
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}
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notifier.notify();
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}

‎structural_design_pattern/decorator/email_notifier_example/email_notifier_without_decorator_example.dart

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abstract class Notifier {
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void notify();
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}
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class EmailNotifier implements Notifier {
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String _email;
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EmailNotifier(String email) : _email = email;
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@override
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void notify() => print("Sending email to: $_email \n");
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}
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// the Phone Notifiers using whats app or sms
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abstract class PhoneNotifier implements Notifier {
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String _phoneNumber;
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PhoneNotifier(String phoneNumber) : _phoneNumber = phoneNumber;
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}
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class SMSNotifier extends PhoneNotifier {
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SMSNotifier(String phoneNumber) : super(phoneNumber);
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@override
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void notify() => print("Sending SMS to $_phoneNumber \n");
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}
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class WhatsAppNotifier extends PhoneNotifier {
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WhatsAppNotifier(String phoneNumber) : super(phoneNumber);
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@override
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void notify() => print("Sending WhatsApp message to $_phoneNumber \n");
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}
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void main(List<String> args) {
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bool isSmsNotificationEnabled = true;
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bool isWhatsAppNotificationEnabled = true;
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Notifier emailNotifier = EmailNotifier("[email protected]");
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emailNotifier.notify();
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if (isSmsNotificationEnabled) {
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Notifier sMSNotifier = SMSNotifier("01000");
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sMSNotifier.notify();
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}
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if (isWhatsAppNotificationEnabled) {
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Notifier whatsAppNotifier = WhatsAppNotifier("01000");
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whatsAppNotifier.notify();
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}
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}

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