Apply suggestions from code review

Co-authored-by: CyB3RC0nN0R <kske@outlook.de>

client/src/main/java/envoy/client/data/ClientConfig.java

@@ -32,9 +32,9 @@ public final class ClientConfig extends Config {
 
 	private ClientConfig() {
 		super(".envoy");
-		put("server", "s", identity(), true);
+		put("server", "s", identity());
-		put("port", "p", Integer::parseInt, true);
+		put("port", "p", Integer::parseInt);
-		put("localDB", "db", File::new, true);
+		put("localDB", "db", File::new);
 		put("ignoreLocalDB", "nodb", Boolean::parseBoolean);
 		put("user", "u", identity());
 		put("password", "pw", identity());
@@ -62,10 +62,7 @@ public final class ClientConfig extends Config {
 	 * @return {@code true} if the local database is to be ignored
 	 * @since Envoy Client v0.3-alpha
 	 */
-	public Boolean isIgnoreLocalDB() {
+	public Boolean isIgnoreLocalDB() { return (Boolean) items.get("ignoreLocalDB").get(); }
-		final var ignoreLocalDB = items.get("ignoreLocalDB").get();
-		return ignoreLocalDB != null && (Boolean) ignoreLocalDB;
-	}
 
 	/**
 	 * @return the user name

client/src/main/java/envoy/client/net/Client.java

@@ -164,11 +164,11 @@ public final class Client implements Closeable {
 		// Process ProfilePicChanges
 		receiver.registerProcessor(ProfilePicChange.class, eventBus::dispatch);
 
-		// Process requests to not send anymore attachments as they will not be shown to
+		// Process requests to not send any more attachments as they will not be shown to
 		// other users
 		receiver.registerProcessor(NoAttachments.class, eventBus::dispatch);
 
-		// Process group creation rejections - they have been disabled on the server
+		// Process group creation results - they might have been disabled on the server
 		receiver.registerProcessor(GroupCreationResult.class, eventBus::dispatch);
 
 		// Send event

client/src/main/java/envoy/client/net/Receiver.java

@@ -67,7 +67,7 @@ public final class Receiver extends Thread {
 				// Catch LV encoding errors
 				if (len != bytesRead) {
 					// Server has stopped sending, i.e. because he went offline
-					if (len == 0 && bytesRead == -1) {
+					if (bytesRead == -1) {
 						isAlive = false;
 						logger.log(Level.INFO, "Lost connection to the server. Exiting receiver...");
 						continue;

client/src/main/java/envoy/client/ui/controller/ChatScene.java

@@ -132,7 +132,6 @@ public final class ChatScene implements Restorable {
 	private AudioRecorder	recorder;
 	private boolean			recording;
 	private Attachment		pendingAttachment;
-
 	private boolean postingPermanentlyDisabled;
 
 	private final SystemCommandsMap messageTextAreaCommands = new SystemCommandsMap();

common/src/main/java/envoy/data/Config.java

@@ -11,10 +11,15 @@ import envoy.util.EnvoyLog;
 
 /**
  * Manages all application settings that are set during application startup by
- * either loading them from the {@link Properties} file
+ * either loading them from the {@link Properties} file (default values)
  * {@code client.properties} or parsing them from the command line arguments of
- * the application.<br>
+ * the application.
- * <br>
+ * <p>
+ * All items inside the {@code Config} are supposed to either be supplied over
+ * default value or over command line argument. Developers that fail to provide
+ * default values will be greeted with an error message the next time they try
+ * to start Envoy...
+ * <p>
  * Project: <strong>envoy-client</strong><br>
  * File: <strong>Config.java</strong><br>
  * Created: <strong>12 Oct 2019</strong><br>
@@ -30,10 +35,10 @@ public class Config {
 
 	protected Config(String folderName) {
 		final var rootDirectory = new File(System.getProperty("user.home"), folderName);
-		put("homeDirectory", "home", File::new, true);
+		put("homeDirectory", "home", File::new);
 		((ConfigItem<File>) get("homeDirectory")).setValue(rootDirectory);
-		put("fileLevelBarrier", "fb", Level::parse, true);
+		put("fileLevelBarrier", "fb", Level::parse);
-		put("consoleLevelBarrier", "cb", Level::parse, true);
+		put("consoleLevelBarrier", "cb", Level::parse);
 	}
 
 	/**
@@ -43,9 +48,7 @@ public class Config {
 	 * @since Envoy Common v0.1-beta
 	 */
 	private void load(Properties properties) {
-		items.entrySet()
+		items.entrySet().stream().filter(e -> properties.containsKey(e.getKey()))
-			.stream()
-			.filter(e -> properties.containsKey(e.getKey()))
 				.forEach(e -> e.getValue().parse(properties.getProperty(e.getKey())));
 	}
 
@@ -61,25 +64,31 @@ public class Config {
 		for (int i = 0; i < args.length; i++)
 			for (final ConfigItem<?> item : items.values())
 				if (args[i].startsWith("--")) {
-					if (args[i].length() == 2) throw new IllegalStateException("Malformed command line argument at position " + i + ": " + args[i]);
+					if (args[i].length() == 2)
+						throw new IllegalStateException(
+								"Malformed command line argument at position " + i + ": " + args[i]);
 					final String commandLong = args[i].substring(2);
 					if (item.getCommandLong().equals(commandLong)) {
 						item.parse(args[++i]);
 						break;
 					}
 				} else if (args[i].startsWith("-")) {
-					if (args[i].length() == 1) throw new IllegalStateException("Malformed command line argument at position " + i + ": " + args[i]);
+					if (args[i].length() == 1)
+						throw new IllegalStateException(
+								"Malformed command line argument at position " + i + ": " + args[i]);
 					final String commandShort = args[i].substring(1);
 					if (item.getCommandShort().equals(commandShort)) {
 						item.parse(args[++i]);
 						break;
 					}
-				} else throw new IllegalStateException("Malformed command line argument at position " + i + ": " + args[i]);
+				} else
+					throw new IllegalStateException(
+							"Malformed command line argument at position " + i + ": " + args[i]);
 	}
 
 	/**
-	 * Supplies default values from the given .properties file and
+	 * Supplies default values from the given .properties file and parses the
-	 * parses the configuration from an array of command line arguments.
+	 * configuration from an array of command line arguments.
 	 *
 	 * @param declaringClass     the class calling this method
 	 * @param propertiesFilePath the path to where the .properties file can be found
@@ -93,37 +102,38 @@ public class Config {
 	 * @since Envoy Common v0.1-beta
 	 */
 	public void loadAll(Class<?> declaringClass, String propertiesFilePath, String[] args) {
-		if (modificationDisabled) throw new IllegalStateException("Cannot change config after isInitialized has been called");
+		if (modificationDisabled)
+			throw new IllegalStateException("Cannot change config after isInitialized has been called");
 		// Load the defaults from the given .properties file first
 		final var properties = new Properties();
 		try {
 			properties.load(declaringClass.getClassLoader().getResourceAsStream(propertiesFilePath));
 		} catch (final IOException e) {
-			EnvoyLog.getLogger(Config.class).log(Level.SEVERE, "An error occurred when reading in the configuration: ", e);
+			EnvoyLog.getLogger(Config.class).log(Level.SEVERE, "An error occurred when reading in the configuration: ",
+					e);
 		}
 		load(properties);
 
 		// Override configuration values with command line arguments
-		if (args.length > 0) load(args);
+		if (args.length > 0)
+			load(args);
 
-		// Check if all mandatory configuration values have been initialized
+		// Check if all configuration values have been initialized
 		isInitialized();
 		// Disable further editing of the config
 		modificationDisabled = true;
 	}
 
 	/**
-	 * @throws IllegalStateException if a mandatory {@link ConfigItem} has not been
+	 * @throws IllegalStateException if a {@link ConfigItem} has not been
 	 *                               initialized
 	 * @since Envoy Common v0.1-beta
 	 */
 	private void isInitialized() {
-		if (items.values().stream().filter(ConfigItem::isMandatory).map(ConfigItem::get).anyMatch(Objects::isNull))
+		if (items.values().stream().map(ConfigItem::get).anyMatch(Objects::isNull))
-			throw new IllegalStateException("config item(s) has/ have not been initialized:" + items.values()
+			throw new IllegalStateException("config item(s) has/ have not been initialized:"
-				.stream()
+					+ items.values().stream().filter(configItem -> configItem.get() == null)
-				.filter(configItem -> configItem.isMandatory() && configItem.get() == null)
+							.map(ConfigItem::getCommandLong).collect(Collectors.toSet()));
-				.map(ConfigItem::getCommandLong)
-				.collect(Collectors.toSet()));
 	}
 
 	/**
@@ -131,28 +141,13 @@ public class Config {
 	 * @return the config item with the specified name
 	 * @since Envoy Common v0.1-beta
 	 */
-	public ConfigItem<?> get(String name) { return items.get(name); }
+	public ConfigItem<?> get(String name) {
-
+		return items.get(name);
-	/**
-	 * Shorthand for <br>
-	 * {@code items.put(commandName, new ConfigItem<>(commandName, commandShort, parseFunction, defaultValue, mandatory))}.
-	 *
-	 * @param <T>           the type of the {@link ConfigItem}
-	 * @param commandName   the key for this config item as well as its long name
-	 * @param commandShort  the abbreviation of this config item
-	 * @param parseFunction the {@code Function<String, T>} that parses the value
-	 *                      from a string
-	 * @param mandatory     indicated that this config item must be initialized with
-	 *                      a non-null value
-	 * @since Envoy Common v0.2-beta
-	 */
-	protected <T> void put(String commandName, String commandShort, Function<String, T> parseFunction, boolean mandatory) {
-		items.put(commandName, new ConfigItem<>(commandName, commandShort, parseFunction, mandatory));
 	}
 
 	/**
 	 * Shorthand for <br>
-	 * {@code put(commandName, commandShort, parseFunction, false)}.
+	 * {@code items.put(commandName, new ConfigItem<>(commandName, commandShort, parseFunction, defaultValue))}.
 	 *
 	 * @param <T>           the type of the {@link ConfigItem}
 	 * @param commandName   the key for this config item as well as its long name
@@ -162,25 +157,30 @@ public class Config {
 	 * @since Envoy Common v0.2-beta
 	 */
 	protected <T> void put(String commandName, String commandShort, Function<String, T> parseFunction) {
-		put(commandName, commandShort, parseFunction, false);
+		items.put(commandName, new ConfigItem<>(commandName, commandShort, parseFunction));
 	}
 
 	/**
 	 * @return the directory in which all local files are saves
 	 * @since Envoy Client v0.2-beta
 	 */
-	public File getHomeDirectory() { return (File) items.get("homeDirectory").get(); }
+	public File getHomeDirectory() {
+		return (File) items.get("homeDirectory").get();
+	}
 
 	/**
 	 * @return the minimal {@link Level} to log inside the log file
 	 * @since Envoy Client v0.2-beta
 	 */
-	public Level getFileLevelBarrier() { return (Level) items.get("fileLevelBarrier").get(); }
+	public Level getFileLevelBarrier() {
+		return (Level) items.get("fileLevelBarrier").get();
+	}
 
 	/**
 	 * @return the minimal {@link Level} to log inside the console
 	 * @since Envoy Client v0.2-beta
 	 */
-	public Level getConsoleLevelBarrier() { return (Level) items.get("consoleLevelBarrier").get(); }
+	public Level getConsoleLevelBarrier() {
-
+		return (Level) items.get("consoleLevelBarrier").get();
+	}
 }

common/src/main/java/envoy/data/ConfigItem.java

@@ -4,8 +4,10 @@ import java.util.function.Function;
 
 /**
  * Contains a single {@link Config} value as well as the corresponding command
- * line arguments and its default value.<br>
+ * line arguments and its default value.
- * <br>
+ * <p>
+ * All {@code ConfigItem}s are automatically mandatory.
+ * <p>
  * Project: <strong>envoy-clientChess</strong><br>
  * File: <strong>ConfigItem.javaEvent.java</strong><br>
  * Created: <strong>21.12.2019</strong><br>
@@ -18,7 +20,6 @@ public final class ConfigItem<T> {
 
 	private final String				commandLong, commandShort;
 	private final Function<String, T>	parseFunction;
-	private final boolean				mandatory;
 
 	private T value;
 
@@ -29,28 +30,12 @@ public final class ConfigItem<T> {
 	 * @param commandShort  the short command line argument to set this value
 	 * @param parseFunction the {@code Function<String, T>} that parses the value
 	 *                      from a string
-	 * @param mandatory     indicated that this config item must be initialized with
-	 *                      a non-null value
-	 * @since Envoy Common v0.1-beta
-	 */
-	public ConfigItem(String commandLong, String commandShort, Function<String, T> parseFunction, boolean mandatory) {
-		this.commandLong	= commandLong;
-		this.commandShort	= commandShort;
-		this.parseFunction	= parseFunction;
-		this.mandatory		= mandatory;
-	}
-
-	/**
-	 * Initializes an optional {@link ConfigItem} without a default value.
-	 *
-	 * @param commandLong   the long command line argument to set this value
-	 * @param commandShort  the short command line argument to set this value
-	 * @param parseFunction the {@code Function<String, T>} that parses the value
-	 *                      from a string
 	 * @since Envoy Common v0.1-beta
 	 */
 	public ConfigItem(String commandLong, String commandShort, Function<String, T> parseFunction) {
-		this(commandLong, commandShort, parseFunction, false);
+		this.commandLong	= commandLong;
+		this.commandShort	= commandShort;
+		this.parseFunction	= parseFunction;
 	}
 
 	/**
@@ -86,11 +71,4 @@ public final class ConfigItem<T> {
 	 * @since Envoy Common v0.2-beta
 	 */
 	protected void setValue(T value) { this.value = value; }
-
-	/**
-	 * @return {@code true} if this {@link ConfigItem} is mandatory for successful
-	 *         application initialization
-	 * @since Envoy Common v0.1-beta
-	 */
-	public boolean isMandatory() { return mandatory; }
 }

common/src/main/java/envoy/event/NoAttachments.java

@@ -11,15 +11,7 @@ package envoy.event;
  * @author Leon Hofmeister
  * @since Envoy Common v0.2-beta
  */
-public class NoAttachments extends Event<Void> {
+public class NoAttachments extends Event.Valueless {
 
 	private static final long serialVersionUID = 1L;
-
-	/**
-	 * Creates a new {@code NoAttachments}.
-	 *
-	 * @since Envoy Common v0.2-beta
-	 */
-	public NoAttachments() { super(null); }
-
 }

server/src/main/java/envoy/server/data/ServerConfig.java

@@ -24,17 +24,17 @@ public final class ServerConfig extends Config {
 
 	private ServerConfig() {
 		super(".envoy-server");
-		put("enter-to-stop", "dev-stop", Boolean::parseBoolean, true);
+		put("enter-to-stop", "dev-stop", Boolean::parseBoolean);
 		// parameters for issue reporting
-		put("issueCreationURL", "i-url", identity(), true);
+		put("issueCreationURL", "i-url", identity());
 		put("issueAuthToken", "i-token", identity());
-		put("userMadeLabel", "l-um", identity(), true);
+		put("userMadeLabel", "l-um", identity());
-		put("bugLabel", "l-b", identity(), true);
+		put("bugLabel", "l-b", identity());
-		put("featureLabel", "l-f", identity(), true);
+		put("featureLabel", "l-f", identity());
 		// enabling/ disabling several processors
-		put("enableIssueReporting", "e-ir", Boolean::parseBoolean, true);
+		put("enableIssueReporting", "e-ir", Boolean::parseBoolean);
-		put("enableGroups", "e-g", Boolean::parseBoolean, true);
+		put("enableGroups", "e-g", Boolean::parseBoolean);
-		put("enableAttachments", "e-a", Boolean::parseBoolean, true);
+		put("enableAttachments", "e-a", Boolean::parseBoolean);
 	}
 
 	/**