Before the dawn

.gitattributes

@@ -0,0 +1,12 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+
+# Binary files should be left untouched
+*.jar           binary
+

.gitignore

@@ -0,0 +1,8 @@
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build
+
+app/bin
+app/build

.project

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>lab5-test</name>
+	<comment>Project lab5-test created by Buildship.</comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
+	</natures>
+	<filteredResources>
+		<filter>
+			<id>1743511323199</id>
+			<name></name>
+			<type>30</type>
+			<matcher>
+				<id>org.eclipse.core.resources.regexFilterMatcher</id>
+				<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
+			</matcher>
+		</filter>
+	</filteredResources>
+</projectDescription>

.settings/org.eclipse.buildship.core.prefs

@@ -0,0 +1,2 @@
+connection.project.dir=app
+eclipse.preferences.version=1

app/.classpath

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="bin/main" path="src/main/java">
+		<attributes>
+			<attribute name="gradle_scope" value="main"/>
+			<attribute name="gradle_used_by_scope" value="main,test"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="bin/main" path="src/main/resources">
+		<attributes>
+			<attribute name="gradle_scope" value="main"/>
+			<attribute name="gradle_used_by_scope" value="main,test"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21/"/>
+	<classpathentry kind="con" path="org.eclipse.buildship.core.gradleclasspathcontainer"/>
+	<classpathentry kind="output" path="bin/default"/>
+</classpath>

app/.project

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>app</name>
+	<comment>Project app created by Buildship.</comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
+	</natures>
+	<filteredResources>
+		<filter>
+			<id>1743511323190</id>
+			<name></name>
+			<type>30</type>
+			<matcher>
+				<id>org.eclipse.core.resources.regexFilterMatcher</id>
+				<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
+			</matcher>
+		</filter>
+	</filteredResources>
+</projectDescription>

app/.settings/org.eclipse.buildship.core.prefs

@@ -0,0 +1,13 @@
+arguments=--init-script /home/oxff/.cache/jdtls/config/org.eclipse.osgi/58/0/.cp/gradle/init/init.gradle
+auto.sync=false
+build.scans.enabled=false
+connection.gradle.distribution=GRADLE_DISTRIBUTION(LOCAL_INSTALLATION(/usr/share/java/gradle))
+connection.project.dir=
+eclipse.preferences.version=1
+gradle.user.home=
+java.home=/usr/lib/jvm/java-21-openjdk
+jvm.arguments=
+offline.mode=false
+override.workspace.settings=true
+show.console.view=true
+show.executions.view=true

app/.settings/org.eclipse.jdt.core.prefs

@@ -0,0 +1,4 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=21
+org.eclipse.jdt.core.compiler.compliance=21
+org.eclipse.jdt.core.compiler.source=21

app/build.gradle

@@ -0,0 +1,46 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java application project to get you started.
+ * For more details on building Java & JVM projects, please refer to https://docs.gradle.org/8.13/userguide/building_java_projects.html in the Gradle documentation.
+ * This project uses @Incubating APIs which are subject to change.
+ */
+
+plugins {
+    // Apply the application plugin to add support for building a CLI application in Java.
+    id 'application'
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // This dependency is used by the application.
+    implementation libs.guava
+}
+
+testing {
+    suites {
+        // Configure the built-in test suite
+    }
+}
+
+// Apply a specific Java toolchain to ease working on different environments.
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+application {
+    // Define the main class for the application.
+    mainClass = 'itmo.lab5.App'
+}
+
+jar {
+  manifest {
+    attributes 'Main-Class': application.mainClass
+  }
+}

app/src/main/java/itmo/lab5/App.java

@@ -0,0 +1,112 @@
+package itmo.lab5;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.InvalidPathException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.HashMap;
+import java.util.Scanner;
+import java.util.logging.*;
+
+import itmo.lab5.cli.CommandBuilder;
+import itmo.lab5.cli.CommandContext;
+import itmo.lab5.cli.CommandRegistry;
+import itmo.lab5.interfaces.Command;
+import itmo.lab5.cli.commands.*;
+import itmo.lab5.models.Flat;
+import itmo.lab5.parser.Reader;
+import itmo.lab5.cli.helpers.History;
+
+public class App {
+    private static final Logger LOGGER = Logger.getLogger(FileHandler.class.getName());
+
+    public static void main(String[] g_args) {
+        Path dataFilePath = null;
+        var history = new History();
+        var flats = new HashMap<Integer, Flat>();
+
+        CommandContext context = new CommandContext();
+        CommandRegistry registry = new CommandBuilder()
+                .register("exit", new ExitCommand())
+                .register("help", new HelpCommand())
+                .register("info", new InfoCommand())
+                .register("clear", new ClearCommand())
+                .register("show", new ShowCommand())
+                .register("remove_key", new RemoveKeyCommand())
+                .register("history", new HistoryCommand())
+                .register("insert", new InsertCommand())
+                .build();
+
+        try {
+            dataFilePath = getDataFileFromEnv("LAB5_DATA");
+            flats = new Reader().parseCSV(dataFilePath.toFile());
+        } catch (IllegalArgumentException | IOException e) {
+            LOGGER.log(Level.WARNING, "There's error while loading file: " + e.getMessage());
+            return;
+        }
+
+        context.set("registry", registry);
+        context.set("collection", flats);
+        context.set("history", history);
+
+        var scanner = new Scanner(System.in);
+
+        while (true) {
+            System.out.print("> ");
+
+            String input = scanner.nextLine().trim();
+            if (input.isEmpty())
+                continue;
+
+            String[] args = input.split(" ");
+            String commandName = args[0];
+            Command command = registry.getByName(commandName);
+
+            if (command != null) {
+                history.add(commandName);
+                var localArgs = args.length > 1 ? java.util.Arrays.copyOfRange(args, 1, args.length) : new String[0];
+                var response = command.execute(localArgs, context);
+                System.out.println(response);
+            } else {
+                System.out.println("Unknown command: " + commandName);
+            }
+        }
+
+    }
+
+    public static Path getDataFileFromEnv(String envVariable) throws IOException {
+        String envPath = System.getenv(envVariable);
+        final Path path;
+
+        if (envPath == null || envPath.trim().isEmpty()) {
+            throw new IllegalArgumentException(
+                    "Environment variable '" + envVariable + "' is not set or empty.");
+        }
+
+        try {
+            path = Paths.get(envPath);
+        } catch (InvalidPathException ex) {
+            throw new IllegalArgumentException(
+                    "The path provided in environment variable '" +
+                            envVariable + "' is invalid: " + ex.getMessage(),
+                    ex);
+        }
+
+        if (!Files.exists(path)) {
+            throw new IllegalArgumentException("The file at path '" + path + "' does not exist.");
+        }
+
+        if (!Files.isRegularFile(path)) {
+            throw new IllegalArgumentException("The path '" + path + "' is not a file. Check twice!");
+        }
+
+        if (!Files.isReadable(path)) {
+            throw new IllegalArgumentException("The file at path '" + path + "' is not readable. " +
+                    "Check file permissions!");
+        }
+
+        LOGGER.info("File '" + path + "' exists and is readable.");
+        return path;
+    }
+}

app/src/main/java/itmo/lab5/cli/CommandBuilder.java

@@ -0,0 +1,20 @@
+package itmo.lab5.cli;
+
+import itmo.lab5.interfaces.Command;
+
+public class CommandBuilder {
+  private final CommandRegistry registry;
+
+  public CommandBuilder() {
+    this.registry = new CommandRegistry();
+  }
+
+  public CommandBuilder register(String name, Command newCommand) {
+    this.registry.register(name, newCommand);
+    return this;
+  }
+
+  public CommandRegistry build() {
+    return this.registry;
+  }
+}

app/src/main/java/itmo/lab5/cli/CommandContext.java

@@ -0,0 +1,15 @@
+package itmo.lab5.cli;
+
+import java.util.HashMap;
+
+public class CommandContext {
+  private HashMap<String, Object> data = new HashMap<>();
+
+  public void set(String key, Object value) {
+    this.data.put(key, value);
+  }
+
+  public Object get(String name) {
+    return this.data.get(name);
+  }
+}

app/src/main/java/itmo/lab5/cli/CommandRegistry.java

@@ -0,0 +1,21 @@
+package itmo.lab5.cli;
+
+import java.util.HashMap;
+import java.util.Map;
+import itmo.lab5.interfaces.Command;
+
+public class CommandRegistry {
+  private final Map<String, Command> commands = new HashMap<>();
+
+  public void register(String name, Command newCommand) {
+    this.commands.put(name, newCommand);
+  }
+
+  public Command getByName(String name) {
+    return this.commands.get(name);
+  }
+
+  public Map<String, Command> getAllCommands() {
+    return this.commands;
+  }
+}

app/src/main/java/itmo/lab5/cli/commands/ClearCommand.java

@@ -0,0 +1,23 @@
+package itmo.lab5.cli.commands;
+
+import java.util.HashMap;
+
+import itmo.lab5.cli.CommandContext;
+import itmo.lab5.interfaces.Command;
+import itmo.lab5.models.Flat;
+
+public class ClearCommand implements Command {
+  @Override
+  public String execute(String args[], CommandContext context) {
+    var collection = new HashMap<Integer, Flat>();
+
+    try {
+      collection = (HashMap<Integer, Flat>) context.get("collection");
+    } catch (ClassCastException e) {
+      return "Can't clear collection. It might be missed";
+    }
+
+    collection.clear();
+    return "Collection was successfuly cleared!";
+  }
+}

app/src/main/java/itmo/lab5/cli/commands/ExitCommand.java

@@ -0,0 +1,12 @@
+package itmo.lab5.cli.commands;
+
+import itmo.lab5.cli.CommandContext;
+import itmo.lab5.interfaces.Command;
+
+public class ExitCommand implements Command {
+  @Override
+  public String execute(String[] args, CommandContext context) {
+    System.exit(0);
+    return "";
+  }
+}

app/src/main/java/itmo/lab5/cli/commands/HelpCommand.java

@@ -0,0 +1,28 @@
+package itmo.lab5.cli.commands;
+
+import itmo.lab5.cli.CommandContext;
+import itmo.lab5.cli.CommandRegistry;
+import itmo.lab5.interfaces.Command;
+
+public class HelpCommand implements Command {
+  @Override
+  public String execute(String args[], CommandContext context) {
+    var registry = (CommandRegistry) context.get("registry");
+    StringBuilder result = new StringBuilder();
+
+    if (registry == null) {
+      result.append("There aren't any avaliable commands!");
+      return result.toString();
+    }
+
+    result.append("List of avaliable commands: ");
+    for (String command : registry.getAllCommands().keySet()) {
+      result.append(command + ", ");
+    }
+
+    return result
+        .delete(result.length() - 2, result.length())
+        .append(".")
+        .toString();
+  }
+}

app/src/main/java/itmo/lab5/cli/commands/HistoryCommand.java

@@ -0,0 +1,23 @@
+package itmo.lab5.cli.commands;
+
+import itmo.lab5.cli.CommandContext;
+import itmo.lab5.interfaces.Command;
+import itmo.lab5.cli.helpers.*;
+
+public class HistoryCommand implements Command {
+  @Override
+  public String execute(String args[], CommandContext context) {
+    var history = new History();
+
+    try {
+      history = (History) context.get("history");
+    } catch (ClassCastException e) {
+      return "There's problem with history. It might be null :(";
+    }
+
+    if (history == null)
+      return "We reach End of History. Somewhere in the world, one Fukuyama is rejoicing :_)";
+
+    return history.toString();
+  }
+}

app/src/main/java/itmo/lab5/cli/commands/InfoCommand.java

@@ -0,0 +1,30 @@
+package itmo.lab5.cli.commands;
+
+import java.util.HashMap;
+import itmo.lab5.cli.CommandContext;
+import itmo.lab5.interfaces.Command;
+import itmo.lab5.models.Flat;
+
+public class InfoCommand implements Command {
+  @Override
+  public String execute(String args[], CommandContext context) {
+    var flats = new HashMap<Integer, Flat>();
+
+    try {
+      flats = (HashMap<Integer, Flat>) context.get("collection");
+    } catch (ClassCastException e) {
+      return "Can't parse collection. Something goes wrong!";
+    }
+
+    if (flats == null || flats.isEmpty()) {
+      return "Collection is empty now!";
+    }
+
+    var anyFlat = flats.values().iterator().next();
+
+    return ("Information about collection: \n" +
+        "Collections stores in: " + flats.getClass().getName() + "\n" +
+        "Collection consists of: " + anyFlat.getClass().getName() + "\n" +
+        "Items: " + flats.size());
+  }
+}

app/src/main/java/itmo/lab5/cli/commands/InsertCommand.java

@@ -0,0 +1,182 @@
+package itmo.lab5.cli.commands;
+
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Scanner;
+import java.util.Arrays;
+
+import itmo.lab5.cli.CommandContext;
+import itmo.lab5.interfaces.Command;
+import itmo.lab5.models.enums.*;
+import itmo.lab5.models.*;
+
+public class InsertCommand implements Command {
+  @Override
+  public String execute(String[] args, CommandContext context) {
+    if (args.length < 1 || !"null".equals(args[0])) {
+      return "Usage: insert null {element}";
+    }
+
+    Scanner scanner = new Scanner(System.in);
+    Date creationDate = new Date();
+
+    System.out.print("- Enter name: ");
+    String name = readNonEmptyString(scanner);
+
+    System.out.println("- Coordinates:");
+    System.out.print("Enter x (int): ");
+    int x = readInt(scanner);
+    System.out.print("Enter y (Long): ");
+    Long y = readLongNotNull(scanner);
+    Coordinates coordinates = new Coordinates(x, y);
+
+    System.out.print("Enter square (Double > 0, <= 626): ");
+    Double area = readDoubleInRange(scanner, 0.0, 626.0);
+
+    System.out.print("Enter room count (int > 0): ");
+    int numberOfRooms = readIntMin(scanner, 1);
+
+    System.out.println("- Furnish");
+    Furnish furnish = readEnum(scanner, Furnish.class);
+
+    System.out.println("- View");
+    View view = readEnumNullable(scanner, View.class);
+
+    System.out.println("- Transport");
+    Transport transport = readEnum(scanner, Transport.class);
+
+    System.out.println("- House");
+    System.out.print("Enter house's name: ");
+
+    String houseName = scanner.nextLine();
+    House house = null;
+
+    if (!houseName.isBlank()) {
+      System.out.print("Enter house age (1-959): ");
+      int year = readIntInRange(scanner, 1, 959);
+      System.out.print("Enter house's floors count (1-77): ");
+      long numberOfFloors = readLongInRange(scanner, 1, 77);
+      house = new House(houseName, year, numberOfFloors);
+    }
+
+    try {
+      HashMap<Integer, Flat> collection = (HashMap<Integer, Flat>) context.get("collection");
+      var newID = collection.size() + 1;
+
+      Flat flat = new Flat(newID, name, coordinates, creationDate, area,
+          numberOfRooms, furnish, view, transport, house);
+      collection.put(newID, flat);
+    } catch (ClassCastException e) {
+      return "There's an error while trying to add new element. Collection im some kind of broken.";
+    }
+
+    return "New flat was successfully inserted!";
+  }
+
+  private String readNonEmptyString(Scanner scanner) {
+    while (true) {
+      String line = scanner.nextLine().trim();
+
+      if (!line.isEmpty())
+        return line;
+
+      System.out.print("Value can't be empty. Retry input: ");
+    }
+  }
+
+  private int readInt(Scanner scanner) {
+    while (true) {
+      try {
+        return Integer.parseInt(scanner.nextLine().trim());
+      } catch (NumberFormatException e) {
+        System.out.print("Please, enter integer: ");
+      }
+    }
+  }
+
+  private Long readLongNotNull(Scanner scanner) {
+    while (true) {
+      String line = scanner.nextLine().trim();
+      if (!line.isEmpty()) {
+        try {
+          return Long.parseLong(line);
+        } catch (NumberFormatException e) {
+          System.out.print("Please, enter Long: ");
+        }
+      } else {
+        System.out.print("Field can't be null. Retry: ");
+      }
+    }
+  }
+
+  private int readIntMin(Scanner scanner, int min) {
+    while (true) {
+      int value = readInt(scanner);
+      if (value >= min)
+        return value;
+      System.out.print("Number must be bigger than " + min + ". Retry: ");
+    }
+  }
+
+  private int readIntInRange(Scanner scanner, int min, int max) {
+    while (true) {
+      int value = readInt(scanner);
+      if (value >= min && value <= max)
+        return value;
+      System.out.print("Enter number in range [" + min + " ... " + max + "] ");
+    }
+  }
+
+  private long readLongInRange(Scanner scanner, long min, long max) {
+    while (true) {
+      try {
+        long value = Long.parseLong(scanner.nextLine().trim());
+        if (value >= min && value <= max)
+          return value;
+        System.out.print("Enter number in range [" + min + " ... " + max + "]");
+      } catch (NumberFormatException e) {
+        System.out.print("Enter Long number: ");
+      }
+    }
+  }
+
+  private Double readDoubleInRange(Scanner scanner, double min, double max) {
+    while (true) {
+      try {
+        Double value = Double.parseDouble(scanner.nextLine().trim());
+        if (value > min && value <= max)
+          return value;
+        System.out.print("Enter float in range [" + (min + 0.0001) + " ... " + max + "] ");
+      } catch (NumberFormatException e) {
+        System.out.print("Enter float number: ");
+      }
+    }
+  }
+
+  private <T extends Enum<T>> T readEnum(Scanner scanner, Class<T> enumClass) {
+    System.out.println("Allowed values: " + Arrays.toString(enumClass.getEnumConstants()));
+    while (true) {
+      String input = scanner.nextLine().trim();
+      try {
+        return Enum.valueOf(enumClass, input);
+      } catch (IllegalArgumentException e) {
+        System.out.print("You must enter one of values from the previous list: ");
+      }
+    }
+  }
+
+  private <T extends Enum<T>> T readEnumNullable(Scanner scanner, Class<T> enumClass) {
+    System.out
+        .println("Allowed values (or empty string): " + Arrays.toString(enumClass.getEnumConstants()));
+    while (true) {
+      String input = scanner.nextLine().trim();
+      if (input.isEmpty())
+        return null;
+      try {
+        return Enum.valueOf(enumClass, input);
+      } catch (IllegalArgumentException e) {
+        System.out.print("You must enter one of values from the previous list: ");
+      }
+    }
+  }
+}

app/src/main/java/itmo/lab5/cli/commands/RemoveKeyCommand.java

@@ -0,0 +1,39 @@
+package itmo.lab5.cli.commands;
+
+import java.util.HashMap;
+
+import itmo.lab5.cli.CommandContext;
+import itmo.lab5.interfaces.Command;
+import itmo.lab5.models.Flat;
+
+public class RemoveKeyCommand implements Command {
+  @Override
+  public String execute(String args[], CommandContext context) {
+    HashMap<Integer, Flat> flats = new HashMap<Integer, Flat>();
+    Integer idToDelete = null;
+
+    try {
+      flats = (HashMap<Integer, Flat>) context.get("collection");
+    } catch (ClassCastException e) {
+      return "There's a problem with collection parsing";
+    }
+
+    if (flats == null)
+      return "Collection is empty. Can't delete anything :(";
+
+    try {
+      idToDelete = Integer.parseInt(args[0]);
+    } catch (Exception e) {
+      return "You provide misstyped argument!";
+    }
+
+    if (idToDelete == null)
+      return "Check argument's value twice";
+
+    if (!flats.containsKey(idToDelete))
+      return "Can't find flat with such id";
+
+    flats.remove(idToDelete);
+    return "Successfuly deleted flat!";
+  }
+}

app/src/main/java/itmo/lab5/cli/commands/ShowCommand.java

@@ -0,0 +1,30 @@
+package itmo.lab5.cli.commands;
+
+import java.util.HashMap;
+
+import itmo.lab5.models.Flat;
+import itmo.lab5.interfaces.Command;
+import itmo.lab5.cli.CommandContext;
+
+public class ShowCommand implements Command {
+  @Override
+  public String execute(String args[], CommandContext context) {
+    var collection = new HashMap<Integer, Flat>();
+
+    try {
+      collection = (HashMap<Integer, Flat>) context.get("collection");
+    } catch (ClassCastException e) {
+      System.out.println("Can't parse collection!");
+    }
+
+    if (collection.isEmpty() || collection.size() == 0) {
+      return "Nothing to show!";
+    }
+
+    for (Flat flat : collection.values()) {
+      System.out.println(flat);
+    }
+
+    return "";
+  }
+}

app/src/main/java/itmo/lab5/cli/commands/UpdateCommand.java

@@ -0,0 +1,135 @@
+package itmo.lab5.cli.commands;
+
+import itmo.lab5.models.*;
+import itmo.lab5.models.enums.*;
+import itmo.lab5.interfaces.Command;
+import itmo.lab5.cli.CommandContext;
+
+import java.util.*;
+
+public class UpdateCommand implements Command {
+  private final Scanner scanner = new Scanner(System.in);
+
+  @Override
+  public String execute(String[] args, CommandContext context) {
+    if (args.length < 1)
+      return "Usage: update id {element}";
+
+    int idToUpdate;
+    try {
+      idToUpdate = Integer.parseInt(args[1]);
+    } catch (NumberFormatException e) {
+      return "Invalid ID!";
+    }
+
+    Map<Integer, Flat> collection = (Map<Integer, Flat>) context.get("collection");
+    if (!collection.containsKey(idToUpdate)) {
+      return "No flat with such ID: " + idToUpdate;
+    }
+
+    Flat oldFlat = collection.get(idToUpdate);
+    Flat updatedFlat = readFlat(idToUpdate, oldFlat);
+    collection.put(idToUpdate, updatedFlat);
+    return "Flat with ID " + idToUpdate + " updated.";
+  }
+
+  private Flat readFlat(int id, Flat oldFlat) {
+    System.out.println("- New information for Flat #" + id);
+    String name = readString("Enter new name: ", false, oldFlat.getName());
+    Coordinates coordinates = readCoordinates(oldFlat.getCoordinates());
+    Date creationDate = new Date();
+    Double area = readNumber("Enter new square: ", 0.0, 626.0, Double::parseDouble, oldFlat.getArea());
+    int rooms = readNumber("Enter new rooms count: ", 1, Integer.MAX_VALUE, Integer::parseInt,
+        oldFlat.getNumberOfRooms());
+    Furnish furnish = readEnum("Enter new furnish: ", Furnish.class, oldFlat.getFurnish());
+    View view = readEnumNullable("Enter new view (or empty string)", View.class, oldFlat.getView());
+    Transport transport = readEnum("Enter new transport: ", Transport.class, oldFlat.getTransport());
+    House house = readHouse(oldFlat.getHouse());
+
+    return new Flat(id, name, coordinates, creationDate, area, rooms, furnish, view, transport, house);
+  }
+
+  private Coordinates readCoordinates(Coordinates oldCoords) {
+    int x = readNumber("Введите координату X", Integer.MIN_VALUE, Integer.MAX_VALUE, Integer::parseInt,
+        oldCoords.getX());
+    Long y = readNumber("Введите координату Y", Long.MIN_VALUE, Long.MAX_VALUE, Long::parseLong, oldCoords.getY());
+    return new Coordinates(x, y);
+  }
+
+  private House readHouse(House oldHouse) {
+    System.out.print("Введите название дома (" + (oldHouse != null ? oldHouse.getName() : "null")
+        + ", пусто — не изменять, полностью пусто — null): ");
+    String name = scanner.nextLine().trim();
+    if (name.isEmpty())
+      return oldHouse;
+    if (name.equals("null"))
+      return null;
+
+    int year = readNumber("Введите год постройки", 1, 959, Integer::parseInt, oldHouse.getYear());
+    long floors = readNumber("Введите количество этажей", 1L, 77L, Long::parseLong, oldHouse.getNumberOfFloors());
+
+    return new House(name, year, floors);
+  }
+
+  private String readString(String message, boolean allowEmpty, String oldValue) {
+    while (true) {
+      System.out.print(message + " (" + oldValue + "): ");
+      String input = scanner.nextLine().trim();
+      if (input.isEmpty())
+        return oldValue;
+      if (!input.isEmpty() || allowEmpty)
+        return input;
+      System.out.println("Строка не может быть пустой.");
+    }
+  }
+
+  private <T extends Enum<T>> T readEnum(String message, Class<T> enumClass, T oldValue) {
+    while (true) {
+      System.out.println(message + " (" + oldValue + ", варианты: "
+          + String.join(", ", Arrays.stream(enumClass.getEnumConstants()).map(Enum::name).toList()) + "):");
+      String input = scanner.nextLine().trim();
+      if (input.isEmpty())
+        return oldValue;
+      try {
+        return Enum.valueOf(enumClass, input);
+      } catch (IllegalArgumentException e) {
+        System.out.println("Неверное значение. Повторите ввод.");
+      }
+    }
+  }
+
+  private <T extends Enum<T>> T readEnumNullable(String message, Class<T> enumClass, T oldValue) {
+    while (true) {
+      System.out.println(message + " (" + (oldValue != null ? oldValue : "null") + ", варианты: "
+          + String.join(", ", Arrays.stream(enumClass.getEnumConstants()).map(Enum::name).toList()) + "):");
+      String input = scanner.nextLine().trim();
+      if (input.isEmpty())
+        return oldValue;
+      try {
+        return Enum.valueOf(enumClass, input);
+      } catch (IllegalArgumentException e) {
+        System.out.println("Неверное значение. Повторите ввод.");
+      }
+    }
+  }
+
+  private <T extends Comparable<T>> T readNumber(String message, T min, T max, Parser<T> parser, T oldValue) {
+    while (true) {
+      System.out.print(message + " (" + oldValue + "): ");
+      String input = scanner.nextLine().trim();
+      if (input.isEmpty())
+        return oldValue;
+      try {
+        T value = parser.parse(input);
+        if (value.compareTo(min) >= 0 && value.compareTo(max) <= 0)
+          return value;
+      } catch (Exception ignored) {
+      }
+      System.out.println("Некорректный ввод. Повторите попытку.");
+    }
+  }
+
+  interface Parser<T> {
+    T parse(String input) throws Exception;
+  }
+}

app/src/main/java/itmo/lab5/cli/helpers/History.java

@@ -0,0 +1,33 @@
+package itmo.lab5.cli.helpers;
+
+import java.util.ArrayDeque;
+import java.util.Deque;
+
+public class History {
+  private static final int MAX_SIZE = 8;
+  private final Deque<String> history = new ArrayDeque<String>(MAX_SIZE);
+
+  public void add(String command) {
+    if (history.size() >= MAX_SIZE)
+      history.removeFirst();
+
+    history.add(command);
+  }
+
+  public String get(int x) {
+    if (x >= MAX_SIZE)
+      return "";
+
+    return (String) history.toArray()[x];
+  }
+
+  public String get() {
+    return history.toString();
+  }
+
+  public String toString() {
+    var builder = new StringBuilder("History: \n");
+    history.forEach(command -> builder.append(" - " + command + "\n"));
+    return builder.toString();
+  }
+}

app/src/main/java/itmo/lab5/cli/helpers/ReaderUtil.java

@@ -0,0 +1,95 @@
+package itmo.lab5.cli.helpers;
+
+import java.util.Arrays;
+import java.util.Scanner;
+
+public class ReaderUtil {
+  private final Scanner scanner;
+
+  public ReaderUtil(Scanner scanner) {
+    this.scanner = scanner;
+  }
+
+  public String promptString(String message, boolean allowEmpty, String oldValue) {
+    while (true) {
+      System.out.print(message);
+      if (!oldValue.isEmpty() || oldValue != null)
+        System.out.print(" (" + oldValue + "): ");
+
+      String input = scanner.nextLine().trim();
+
+      if (input.isEmpty())
+        return oldValue;
+      if (!input.isEmpty() || allowEmpty)
+        return input;
+
+      System.out.println("String can't be empty ");
+    }
+  }
+
+  public <T extends Enum<T>> T promptEnum(String message, Class<T> enumClass, T oldValue) {
+    while (true) {
+      if (oldValue != null)
+        System.out.print("Now it's: " + oldValue + ". ");
+
+      System.out.println(
+          message + "(options: " +
+              String.join(", ", Arrays.stream(enumClass.getEnumConstants()).map(Enum::name).toList()) +
+              "): ");
+
+      String input = scanner.nextLine().trim();
+
+      if (input.isEmpty())
+        return oldValue;
+      try {
+        return Enum.valueOf(enumClass, input);
+      } catch (IllegalArgumentException e) {
+        System.out.println("Invalid name; Please, try again: ");
+      }
+
+    }
+  }
+
+  public <T extends Enum<T>> T promptEnumNullable(String message, Class<T> enumClass, T oldValue) {
+    while (true) {
+      if (oldValue != null)
+        System.out.print("Now it's: " + oldValue + ". ");
+
+      System.out.println(
+          message + "(options: " +
+              String.join(", ", Arrays.stream(enumClass.getEnumConstants()).map(Enum::name).toList()) +
+              "): ");
+
+      String input = scanner.nextLine().trim();
+
+      if (input.isEmpty())
+        return oldValue;
+      try {
+        return Enum.valueOf(enumClass, input);
+      } catch (IllegalArgumentException e) {
+        System.out.println("Invalid name; Please, try again: ");
+      }
+    }
+  }
+
+  public <T extends Comparable<T>> T promptNumber(String message, T min, T max, Parser<T> parser, T oldValue) {
+    while (true) {
+      System.out.print(message + " (" + oldValue + "): ");
+      String input = scanner.nextLine().trim();
+      if (input.isEmpty())
+        return oldValue;
+      try {
+        T value = parser.parse(input);
+        if (value.compareTo(min) >= 0 && value.compareTo(max) <= 0)
+          return value;
+      } catch (Exception e) {
+      }
+
+      System.out.println("Invalid value; Please, try again: ");
+    }
+  }
+
+  public interface Parser<T> {
+    T parse(String input) throws Exception;
+  }
+}

app/src/main/java/itmo/lab5/interfaces/Command.java

@@ -0,0 +1,7 @@
+package itmo.lab5.interfaces;
+
+import itmo.lab5.cli.CommandContext;
+
+public interface Command {
+  String execute(String[] args, CommandContext context);
+}

app/src/main/java/itmo/lab5/models/Coordinates.java

@@ -0,0 +1,31 @@
+package itmo.lab5.models;
+
+public class Coordinates {
+  private int x;
+  private Long y; // Поле не может быть null
+
+  public Coordinates(int x, Long y) {
+    this.x = x;
+    this.y = y;
+  }
+
+  public void setX(int x) {
+    this.x = x;
+  }
+
+  public void setY(Long y) {
+    this.y = y;
+  }
+
+  public int getX() {
+    return this.x;
+  }
+
+  public Long getY() {
+    return this.y;
+  }
+
+  public String toString() {
+    return "Point(x = " + Integer.toString(x) + ", y = " + Long.toString(y) + ")";
+  }
+}

app/src/main/java/itmo/lab5/models/Flat.java

@@ -0,0 +1,141 @@
+package itmo.lab5.models;
+
+import itmo.lab5.models.enums.*;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+public class Flat {
+  private int id; // Значение поля должно быть больше 0, Значение этого поля должно быть
+                  // уникальным, Значение этого поля должно генерироваться автоматически
+  private String name; // Поле не может быть null, Строка не может быть пустой
+  private Coordinates coordinates; // Поле не может быть null
+  private Date creationDate; // Поле не может быть null, Значение этого поля должно генерироваться
+                             // автоматически
+  private Double area; // Максимальное значение поля: 626, Значение поля должно быть больше 0
+  private int numberOfRooms; // Значение поля должно быть больше 0
+  private Furnish furnish; // Поле не может быть null
+  private View view; // Поле может быть null
+  private Transport transport; // Поле не может быть null
+  private House house; // Поле может быть null
+
+  public Flat(int id, String name, Coordinates coordinates, Date creationDate, Double area,
+      int numberOfRooms, Furnish furnish, View view, Transport transport, House house) {
+    this.id = id;
+    this.name = name;
+    this.coordinates = coordinates;
+    this.creationDate = creationDate;
+    this.area = area;
+    this.numberOfRooms = numberOfRooms;
+    this.furnish = furnish;
+    this.view = view;
+    this.transport = transport;
+    this.house = house;
+  }
+
+  public Flat() {
+
+  }
+
+  public int getId() {
+    return id;
+  }
+
+  public void setId(int id) {
+    this.id = id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public Coordinates getCoordinates() {
+    return coordinates;
+  }
+
+  public void setCoordinates(Coordinates coordinates) {
+    this.coordinates = coordinates;
+  }
+
+  public Date getCreationDate() {
+    return creationDate;
+  }
+
+  public void setCreationDate(Date creationDate) {
+    this.creationDate = creationDate;
+  }
+
+  public Double getArea() {
+    return area;
+  }
+
+  public void setArea(Double area) {
+    this.area = area;
+  }
+
+  public int getNumberOfRooms() {
+    return numberOfRooms;
+  }
+
+  public void setNumberOfRooms(int numberOfRooms) {
+    this.numberOfRooms = numberOfRooms;
+  }
+
+  public Furnish getFurnish() {
+    return furnish;
+  }
+
+  public void setFurnish(Furnish furnish) {
+    this.furnish = furnish;
+  }
+
+  public View getView() {
+    return view;
+  }
+
+  public void setView(View view) {
+    this.view = view;
+  }
+
+  public Transport getTransport() {
+    return transport;
+  }
+
+  public void setTransport(Transport transport) {
+    this.transport = transport;
+  }
+
+  public House getHouse() {
+    return house;
+  }
+
+  public void setHouse(House house) {
+    this.house = house;
+  }
+
+  @Override
+  public String toString() {
+    var sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
+    var dateFormat = (creationDate == null) ? "null" : sdf.format(creationDate);
+    var builder = new StringBuilder();
+
+    builder
+        .append("Flat:\n")
+        .append("  ID: ").append(id).append("\n")
+        .append("  Name: ").append(name).append("\n")
+        .append("  Coordinates: ").append(coordinates != null ? coordinates.toString() : "null").append("\n")
+        .append("  Creation Date: ").append(dateFormat).append("\n")
+        .append("  Area: ").append(area).append("\n")
+        .append("  Number Of Rooms: ").append(numberOfRooms).append("\n")
+        .append("  Furnish: ").append(furnish).append("\n")
+        .append("  View: ").append(view != null ? view : "null").append("\n")
+        .append("  Transport: ").append(transport).append("\n")
+        .append("  House: ").append(house != null ? house.toString() : "null").append("\n");
+
+    return builder.toString();
+  }
+}

app/src/main/java/itmo/lab5/models/House.java

@@ -0,0 +1,33 @@
+package itmo.lab5.models;
+
+public class House {
+  private String name; // Поле не может быть null
+  private int year; // Максимальное значение поля: 959, Значение поля должно быть больше 0
+  private long numberOfFloors; // Максимальное значение поля: 77, Значение поля должно быть больше 0
+
+  public House(String name, int year, long numberOfFloors) {
+    this.name = name;
+    this.year = year;
+    this.numberOfFloors = numberOfFloors;
+  }
+
+  public String getName() {
+    return this.name;
+  }
+
+  public int getYear() {
+    return this.year;
+  }
+
+  public long getNumberOfFloors() {
+    return this.getNumberOfFloors();
+  }
+
+  public String toString() {
+    return "House(" +
+        "name = '" + name +
+        "', year = " + Integer.toString(year) +
+        ", numberOfFloors = " + Long.toString(numberOfFloors) +
+        ")";
+  }
+}

app/src/main/java/itmo/lab5/models/enums/Furnish.java

@@ -0,0 +1,7 @@
+package itmo.lab5.models.enums;
+
+public enum Furnish {
+  DESIGNER,
+  FINE,
+  BAD;
+}

app/src/main/java/itmo/lab5/models/enums/Transport.java

@@ -0,0 +1,8 @@
+package itmo.lab5.models.enums;
+
+public enum Transport {
+  FEW,
+  NONE,
+  LITTLE,
+  NORMAL;
+}

app/src/main/java/itmo/lab5/models/enums/View.java

@@ -0,0 +1,8 @@
+package itmo.lab5.models.enums;
+
+public enum View {
+  STREET,
+  PARK,
+  NORMAL,
+  GOOD;
+}

app/src/main/java/itmo/lab5/parser/Reader.java

@@ -0,0 +1,79 @@
+package itmo.lab5.parser;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+import java.util.stream.Collectors;
+
+import itmo.lab5.models.enums.*;
+import itmo.lab5.models.*;
+
+public class Reader {
+  static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
+
+  public HashMap<Integer, Flat> parseCSV(File file) throws FileNotFoundException, IllegalArgumentException {
+    var collection = new HashMap<Integer, Flat>();
+    var scanner = new Scanner(file);
+
+    if (scanner.hasNextLine()) {
+      var currentLine = scanner.nextLine();
+      if (!currentLine.contains("id,name")) {
+        scanner = new Scanner(file);
+      }
+    }
+
+    while (scanner.hasNextLine()) {
+      var currentLine = scanner.nextLine();
+      Flat parsedFlat = null;
+
+      try {
+        parsedFlat = parseFlat(currentLine);
+      } catch (Exception e) {
+        throw new IllegalArgumentException(
+            "There's an error while trying to parse line: '"
+                + currentLine + "'; "
+                + "The error is: " + e.getMessage());
+      }
+
+      collection.put(parsedFlat.getId(), parsedFlat);
+    }
+
+    collection = collection.entrySet()
+        .stream()
+        .sorted(HashMap.Entry.comparingByKey())
+        .collect(Collectors.toMap(
+            Map.Entry::getKey,
+            Map.Entry::getValue,
+            (oldValue, newValue) -> oldValue,
+            HashMap::new));
+
+    scanner.close();
+    return collection;
+  }
+
+  private static Flat parseFlat(String lineToParse) throws IllegalArgumentException, ParseException {
+    var values = lineToParse.split(",", -1);
+    var flat = new Flat();
+
+    flat.setId(Integer.parseInt(values[0]));
+    flat.setName(values[1]);
+    flat.setCoordinates(new Coordinates(Integer.parseInt(values[2]), Long.parseLong(values[3])));
+    flat.setCreationDate(dateFormat.parse(values[4]));
+    flat.setArea(Double.parseDouble(values[5]));
+    flat.setNumberOfRooms(Integer.parseInt(values[6]));
+    flat.setFurnish(Furnish.valueOf(values[7]));
+    flat.setView(values[8].isEmpty() ? null : View.valueOf(values[8]));
+    flat.setTransport(Transport.valueOf(values[9]));
+
+    if (!values[10].isEmpty()) {
+      House house = new House(values[10], Integer.parseInt(values[11]), Long.parseLong(values[12]));
+      flat.setHouse(house);
+    }
+
+    return flat;
+  }
+}

app/src/main/resources/data.csv

@@ -0,0 +1,6 @@
+id,name,coordinates_x,coordinates_y,creationDate,area,numberOfRooms,furnish,view,transport,house_name,house_year,house_numberOfFloors
+1,Flat1,100,50,2024-04-01T12:00:00,500.5,3,DESIGNER,STREET,NORMAL,House1,500,10
+2,Flat2,200,60,2024-04-01T12:05:00,450.0,2,FINE,,FEW,House2,800,5
+3,Flat3,300,70,2024-04-01T12:10:00,626.0,4,BAD,PARK,LITTLE,,,
+4,Flat4,400,80,2024-04-01T12:15:00,300.0,1,DESIGNER,GOOD,NONE,House3,959,77
+5,Flat5,500,90,2024-04-01T12:20:00,550.5,2,FINE,NORMAL,NORMAL,House4,600,20

gradle.properties

@@ -0,0 +1,7 @@
+# This file was generated by the Gradle 'init' task.
+# https://docs.gradle.org/current/userguide/build_environment.html#sec:gradle_configuration_properties
+
+org.gradle.configuration-cache=true
+org.gradle.parallel=true
+org.gradle.caching=true
+

gradle/libs.versions.toml

@@ -0,0 +1,8 @@
+# This file was generated by the Gradle 'init' task.
+# https://docs.gradle.org/current/userguide/platforms.html#sub::toml-dependencies-format
+
+[versions]
+guava = "33.3.1-jre"
+
+[libraries]
+guava = { module = "com.google.guava:guava", version.ref = "guava" }

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1,15 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ * For more detailed information on multi-project builds, please refer to https://docs.gradle.org/8.13/userguide/multi_project_builds.html in the Gradle documentation.
+ * This project uses @Incubating APIs which are subject to change.
+ */
+
+plugins {
+    // Apply the foojay-resolver plugin to allow automatic download of JDKs
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.9.0'
+}
+
+rootProject.name = 'lab5'
+include('app')