Added System Commands basics - may change again

client/src/main/java/envoy/client/data/commands/NoArgSystemCommand.java

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+package envoy.client.data.commands;
+
+import java.util.function.Function;
+
+/**
+ * This class is the base class for all {@link SystemCommand}s that do not need
+ * another argument to parse their function.
+ * <p>
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>NoArgSystemCommand.java</strong><br>
+ * Created: <strong>16.07.2020</strong><br>
+ *
+ * @author Leon Hofmeister
+ * @since Envoy Client v0.1-beta
+ */
+public class NoArgSystemCommand extends SystemCommand<Void> {
+
+	/**
+	 * Constructs a new {@code NoArgSystemCommand} that takes no arguments.
+	 *
+	 * @param command the string that must be inputted to execute the given action
+	 * @param action  the action that should be performed
+	 * @since Envoy Client v0.1-beta
+	 */
+	public NoArgSystemCommand(String command, Function<Void, Void> action) { super(command, action); }
+}

client/src/main/java/envoy/client/data/commands/StringArgSystemCommand.java

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+package envoy.client.data.commands;
+
+import java.util.function.Function;
+
+/**
+ * This class is the base class for all {@link SystemCommand}s that need a
+ * String to parse their function.
+ * <p>
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>StringArgSystemCommand.java</strong><br>
+ * Created: <strong>16.07.2020</strong><br>
+ *
+ * @author Leon Hofmeister
+ * @since Envoy Client v0.1-beta
+ */
+public class StringArgSystemCommand extends SystemCommand<String> {
+
+	/**
+	 * Constructs a new {@code NoArgSystemCommand} that takes a String argument.
+	 *
+	 * @param command the string that must be inputted to execute the given action
+	 * @param action  the action that should be performed
+	 * @since Envoy Client v0.1-beta
+	 */
+	public StringArgSystemCommand(String command, Function<String, Void> action) { super(command, action); }
+}

client/src/main/java/envoy/client/data/commands/SystemCommand.java

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+package envoy.client.data.commands;
+
+import java.util.function.Function;
+
+/**
+ * This class is the base class of all {@code SystemCommands} and contains an
+ * action and a command that needs to be inputted to execute the given action.
+ * No {@code SystemCommand} can return anything.
+ * <p>
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>SystemCommand.java</strong><br>
+ * Created: <strong>16.07.2020</strong><br>
+ *
+ * @author Leon Hofmeister
+ * @param <T> the type of argument needed
+ * @since Envoy Client v0.1-beta
+ */
+public abstract class SystemCommand<T> {
+
+	/**
+	 * This variable stores the command that should be inputted to execute the given
+	 * action
+	 */
+	protected final String command;
+
+	protected final Function<T, Void> action;
+
+	/**
+	 * Constructs a new {@code NoArgSystemCommand} that takes no arguments.
+	 *
+	 * @param command the string that must be inputted to execute the given action
+	 * @param action  the action that should be performed
+	 * @since Envoy Client v0.1-beta
+	 */
+	public SystemCommand(String command, Function<T, Void> action) {
+		this.command	= command;
+		this.action		= action;
+	}
+
+	/**
+	 * @return the command that must be inputted to execute the given action
+	 * @since Envoy Client v0.1-beta
+	 */
+	public String getCommand() { return command; }
+
+	/**
+	 * @return the action that should be performed
+	 * @since Envoy Client v0.1-beta
+	 */
+	public Function<T, Void> getAction() { return action; }
+}

client/src/main/java/envoy/client/data/commands/package-info.java

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+/**
+ * This package contains all classes that can be used as system commands.<br>
+ * Every system command can be called using a specific syntax:"/&lt;command&gt;"
+ * <p>
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>package-info.java</strong><br>
+ * Created: <strong>16.07.2020</strong><br>
+ *
+ * @author Leon Hofmeister
+ * @since Envoy Client v0.1-beta
+ */
+package envoy.client.data.commands;