oppgave: logger

src/main/java/oving6/logger/DistributingLogger.java

@@ -0,0 +1,48 @@
+package oving6.logger;
+
+public class DistributingLogger implements ILogger {
+	ILogger errorLogger;
+	ILogger warningLogger;
+	ILogger infoLogger;
+
+	DistributingLogger(ILogger errorLogger, ILogger warningLogger, ILogger infoLogger) {
+		this.errorLogger = errorLogger;
+		this.warningLogger = warningLogger;
+		this.infoLogger = infoLogger;
+	}
+
+	void setLogger(String severity, ILogger logger) {
+		switch (severity) {
+			case "error":
+				errorLogger = logger;
+				break;
+			case "warning":
+				warningLogger = logger;
+				break;
+			case "info":
+				infoLogger = logger;
+				break;
+			default:
+				throw new IllegalArgumentException("Invalid severity level for logger");
+		}
+
+	}
+
+	@Override
+	public void log(String severity, String message, Exception exception) {
+		switch (severity) {
+			case "error":
+				errorLogger.log(severity, message, exception);
+				break;
+			case "warning":
+				warningLogger.log(severity, message, exception);
+				break;
+			case "info":
+				infoLogger.log(severity, message, exception);
+				break;
+			default:
+				throw new IllegalArgumentException("Invalid severity level for logger");
+		}
+
+	}
+}

src/main/java/oving6/logger/FilteringLogger.java

@@ -0,0 +1,29 @@
+package oving6.logger;
+
+import java.util.HashMap;
+
+public class FilteringLogger {
+	private ILogger logger;
+	private HashMap<String, Boolean> logging = new HashMap<String, Boolean>();
+
+	FilteringLogger(ILogger logger, String... severities) {
+		this.logger = logger;
+		for (String severity : severities) {
+			logging.put(severity, true);
+		}
+	}
+
+	boolean isLogging(String severity) {
+		return logging.getOrDefault(severity, false);
+	}
+
+	void setIsLogging(String severity, boolean value) {
+		logging.put(severity, value);
+	}
+
+	void log(String severity, String message, Exception exception) {
+		if (isLogging(severity)) {
+			logger.log(severity, message, exception);
+		}
+	}
+}

src/main/java/oving6/logger/ILogger.java

@@ -0,0 +1,9 @@
+package oving6.logger;
+
+public interface ILogger {
+	String ERROR = "error";
+	String WARNING = "warning";
+	String INFO = "info";
+
+	void log(String severity, String message, Exception exception);
+}

src/main/java/oving6/logger/StreamLogger.java

@@ -0,0 +1,31 @@
+package oving6.logger;
+
+import java.io.OutputStream;
+
+public class StreamLogger implements ILogger {
+	private OutputStream stream;
+	private String formatString = "%s: %s (%s)";
+
+	StreamLogger(OutputStream stream) {
+		this.stream = stream;
+	}
+
+	@Override
+	public void log(String severity, String message, Exception exception) {
+		try {
+			String logMessage = String.format(formatString, severity, message, exception) + "\n";
+			stream.write(logMessage.getBytes());
+			stream.flush();
+		} catch (Exception e) {
+			System.out.println(e);
+		}
+
+	}
+
+	void setFormatString(String formatString) {
+		if (formatString == null) {
+			throw new IllegalArgumentException("formatString cannot be null");
+		}
+		this.formatString = formatString;
+	}
+}