feat(lab10/q5): implement logging system with multiple logger types

Author: PunGrumpy

Design-Patterns-in-OOP/10-lab/q5/App.java

@@ -0,0 +1,13 @@
+public class App {
+    public static void main(String[] args) {
+        UnifiedLogger logger = new UnifiedLogger();
+
+        logger.log("This is an information.", LogLevel.INFO);
+        System.out.println();
+
+        logger.log("This is a debug information.", LogLevel.DEBUG);
+        System.out.println();
+
+        logger.log("This is an error information.", LogLevel.ERROR);
+    }
+}

Design-Patterns-in-OOP/10-lab/q5/ErrorConsoleLogger.java

@@ -0,0 +1,6 @@
+public class ErrorConsoleLogger implements Logger {
+    @Override
+    public void log(String message, LogLevel level) {
+        System.out.println("Error Console::Logger: " + message);
+    }
+}

Design-Patterns-in-OOP/10-lab/q5/FileLogger.java

@@ -0,0 +1,6 @@
+public class FileLogger implements Logger {
+    @Override
+    public void log(String message, LogLevel level) {
+        System.out.println("File::Logger: " + message);
+    }
+}

Design-Patterns-in-OOP/10-lab/q5/LogLevel.java

@@ -0,0 +1,3 @@
+public enum LogLevel {
+    INFO, DEBUG, ERROR
+}

Design-Patterns-in-OOP/10-lab/q5/Logger.java

@@ -0,0 +1,3 @@
+public interface Logger {
+    void log(String message, LogLevel level);
+}

Design-Patterns-in-OOP/10-lab/q5/StandardConsoleLogger.java

@@ -0,0 +1,6 @@
+public class StandardConsoleLogger implements Logger {
+    @Override
+    public void log(String message, LogLevel level) {
+        System.out.println("Standard Console::Logger: " + message);
+    }
+}

Design-Patterns-in-OOP/10-lab/q5/UnifiedLogger.java

@@ -0,0 +1,25 @@
+public class UnifiedLogger {
+    private Logger standardLogger = new StandardConsoleLogger();
+    private Logger fileLogger = new FileLogger();
+    private Logger errorLogger = new ErrorConsoleLogger();
+
+    public void log(String message, LogLevel level) {
+        switch (level) {
+            case INFO:
+                // INFO: Only show on standard console
+                standardLogger.log(message, level);
+                break;
+            case DEBUG:
+                // DEBUG: Show on file and standard console
+                fileLogger.log(message, level);
+                standardLogger.log(message, level);
+                break;
+            case ERROR:
+                // ERROR: Show on error console, file and standard console
+                errorLogger.log(message, level);
+                fileLogger.log(message, level);
+                standardLogger.log(message, level);
+                break;
+        }
+    }
+}