[Zero-base] 11-10. 템플릿 메서드(Template Method)

행동 패턴 - Template Method

 

해결하려는 문제

• 문제 해결의 큰 흐름은 유지하고, 단계별 처리는 위임하고자 할 때
• 구체적인 처리 방법은 하위 클래스로 위임하고자 할 때

 

 

public class Main {

    public static void main(String[] args) {
//      Keyboard keyboard = new LoggingKeyboard();
        Keyboard keyboard = new EscKeyMonitoringKeyboard();
                
        keyboard.press(new AlphabetKey("A"));
        keyboard.press(new AlphabetKey("B"));
        keyboard.press(new AlphabetKey("C"));
        keyboard.press(new AlphabetKey("ESC"));

    }
}

public abstract class Keyboard {
    public void press(KeyboardKey keyboardKey) {
    
        keyDown(keyboardKey);
        System.out.println("입력된 키 : " + keyboardKey.getKey());
        keyUp(keyboardKey);
    }
    
    protected abstract void keyUp(KeyboardKey key);
    protected abstract void keyDown(KeyboardKey key);
}

public class LoggingKeyboard extends Keyboard {
    @Override
    protected void keyUp(KeyboardKey key) {
        System.out.println("logging...key up : " + key.getKey());
    }
    
    @Override
    protected void keyDown(KeyboardKey key) {
        System.out.println("logging...key down : " + key.getKey());
    }
}

public interface KeyboardKey {
    String getKey();
}

public class Alphabet implements KeyboardKey {
    private String keyName;
    public AlphabetKey(String keyName) {
        this.keyName = keyName;
    }
    
    @Override
    public String getKey() {
        return keyName;
    }
}

public class EscKeyMonitoringKeyboard extends Keyboard {
    @Override
    protected void keyUp(Keyboard key) {
        if (isEscKey(key)) {
            System.out.println("ESC logging...key up : " + key.getKey());
        }
    }
    
    @Override
    protected void keyDown(Keyboard key) {
        if (isEscKey(key)) {
            System.out.println("ESC logging...key down : " + key.getKey());
        }
    }
    
    private boolean isEscKey(KeyboardKey key) {
//      return key.getKey().equalsIgnoreCase("ESC");
        return "ESC".equalsIgnoreCase(key.getKey());
    }
}

 

 

 

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