added lab4 ex2

src/lab4_command/ex2/FileAction.java

@@ -0,0 +1,8 @@
+package lab4_command.ex2;
+
+public abstract class FileAction implements MenuAction {
+    protected TextFile file;
+    public FileAction(TextFile file) {
+        this.file = file;
+    }
+}

src/lab4_command/ex2/MenuAction.java

@@ -0,0 +1,5 @@
+package lab4_command.ex2;
+
+public interface MenuAction {
+    void execute();
+}

src/lab4_command/ex2/TextEditor.java

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+package lab4_command.ex2;
+
+import lab4_command.ex2.actions.*;
+
+import java.util.ArrayList;
+
+public class TextEditor {
+    private ArrayList<MenuAction> menu = new ArrayList<>();
+    private TextFile file;
+
+    public TextEditor(TextFile file) {
+        this.file = file;
+
+        addMenuAction(new OpenAction(this.file));
+        addMenuAction(new CloseAction(this.file));
+        addMenuAction(new SaveAction(this.file));
+        addMenuAction(new CopyAction(this.file));
+        addMenuAction(new PasteAction(this.file));
+    }
+
+    public void clickMenu(int entry) {
+        MenuAction action = null;
+        try {
+            action = menu.get(entry);
+        } catch (IndexOutOfBoundsException e) {
+            System.out.println("No action bound to entry " + entry);
+        }
+
+        if (action != null) {
+            action.execute();
+        }
+    }
+
+    public void addMenuAction(MenuAction action) {
+        menu.add(action);
+    }
+
+    public void removeMenuAction(int i) {
+        menu.remove(i);
+    }
+
+    public void setMenuAction(int i, MenuAction action) {
+        menu.set(i, action);
+    }
+
+    public static void main(String[] args) {
+        TextFile file = new TextFile("test.txt");
+        TextEditor editor = new TextEditor(file);
+
+        editor.clickMenu(0);
+        editor.clickMenu(1);
+        editor.clickMenu(2);
+        editor.clickMenu(3);
+        editor.clickMenu(4);
+    }
+}

src/lab4_command/ex2/TextFile.java

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+package lab4_command.ex2;
+
+public class TextFile {
+    private String name;
+
+    public TextFile(String name) {
+        this.name = name;
+    }
+
+    public void open() {
+        System.out.println("Opening file " + name);
+    }
+
+    public void close() {
+        System.out.println("Closing file " + name);
+    }
+
+    public void save() {
+        System.out.println("Saving file " + name);
+    }
+
+    public void copy() {
+        System.out.println("Copying file " + name);
+    }
+
+    public void paste() {
+        System.out.println("Pasting file " + name);
+    }
+}

src/lab4_command/ex2/actions/CloseAction.java

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+package lab4_command.ex2.actions;
+
+import lab4_command.ex2.FileAction;
+import lab4_command.ex2.TextFile;
+
+public class CloseAction extends FileAction {
+    public CloseAction(TextFile file) {
+        super(file);
+    }
+
+    @Override
+    public void execute() {
+        file.close();
+    }
+}

src/lab4_command/ex2/actions/CopyAction.java

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+package lab4_command.ex2.actions;
+
+import lab4_command.ex2.FileAction;
+import lab4_command.ex2.TextFile;
+
+public class CopyAction extends FileAction {
+    public CopyAction(TextFile file) {
+        super(file);
+    }
+
+    @Override
+    public void execute() {
+        file.copy();
+    }
+}

src/lab4_command/ex2/actions/OpenAction.java

@@ -0,0 +1,15 @@
+package lab4_command.ex2.actions;
+
+import lab4_command.ex2.FileAction;
+import lab4_command.ex2.TextFile;
+
+public class OpenAction extends FileAction {
+    public OpenAction(TextFile file) {
+        super(file);
+    }
+
+    @Override
+    public void execute() {
+        file.open();
+    }
+}

src/lab4_command/ex2/actions/PasteAction.java

@@ -0,0 +1,15 @@
+package lab4_command.ex2.actions;
+
+import lab4_command.ex2.FileAction;
+import lab4_command.ex2.TextFile;
+
+public class PasteAction extends FileAction {
+    public PasteAction(TextFile file) {
+        super(file);
+    }
+
+    @Override
+    public void execute() {
+        file.paste();
+    }
+}

src/lab4_command/ex2/actions/SaveAction.java

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+package lab4_command.ex2.actions;
+
+import lab4_command.ex2.FileAction;
+import lab4_command.ex2.TextFile;
+
+public class SaveAction extends FileAction {
+    public SaveAction(TextFile file) {
+        super(file);
+    }
+
+    @Override
+    public void execute() {
+        file.save();
+    }
+}