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Command pattern for simple text editor


Making additional subclasses at any time should be as painless as possibleSimple text editor classBeginner text editorImplementation of stackJava Swing Text EditorImplement stack class from scratch for a h-rank challengeBasic Text EditorRich Edit Form Input (x86-16)Simple console text editorText editor using MVC pattern













0












$begingroup$


I was asked to code a TextPad with following functionality:
display() – to display the entire content



display(n, m) – to display from line n to m



insert(n, text) – to insert text at line n



delete(n) – delete line n



delete(n, m) – delete from line n to m



copy(n, m) – copy contents from line n to m to clipboard



paste(n) – paste contents from clipboard to line n



undo() – undo last command



redo() – redo last command



They expected the textpad to be in memory (not as file). They also expected to handle error gracefully and the program to be menu driven.



Can someone please review the class structure implemented. Can it be improved so that code can be easily modified and extended?



public interface Command 

void execute();

void undo();





package com.onedirect.oodesign.textpad;

public class PasteCommand implements Command

private TextPad textPad;

private Integer line;

public PasteCommand(TextPad textPad, Integer line)
this.textPad = textPad;
this.line = line;


@Override
public void execute()
this.textPad.getLines().addAll(line, this.textPad.getClipBoard());


@Override
public void undo()
for (int i = line; i < this.textPad.getClipBoard().size(); i++)
this.textPad.getLines().remove(i);








package com.onedirect.oodesign.textpad;

public class CopyCommand implements Command

private TextPad textPad;

private Integer from;

private Integer to;

public CopyCommand(TextPad textPad, Integer from, Integer to)
this.textPad = textPad;
this.from = from;
this.to = to;



@Override
public void execute()
this.textPad.setClipBoard(this.textPad.getLines().subList(from, to));


@Override
public void undo()







package com.onedirect.oodesign.textpad;

import java.util.List;

public class DeleteCommand implements Command


private TextPad textPad;

private Integer from;

private Integer to;

private List<String> lines;

public DeleteCommand(TextPad textPad, Integer from, Integer to)
this.textPad = textPad;
this.from = from;
this.to =to;


@Override
public void execute()
List<String> content = textPad.getLines();
this.lines = content.subList(from, to);
for (int i = from; i < to && i<content.size(); i++)
content.remove(i);



@Override
public void undo()
List<String> content = textPad.getLines();
content.addAll(from, this.lines);





package com.onedirect.oodesign.textpad;

import java.util.List;

public class DisplayCommand implements Command


private TextPad textPad;

private int m;

private int n;

public DisplayCommand(TextPad textPad, int m, int n)
this.textPad = textPad;
this.m = m;
this.n = n;

public DisplayCommand(TextPad textPad)
this.textPad = textPad;
this.m = 0;
this.n = this.textPad.getLines().size();


@Override
public void execute()
List<String> list = this.textPad.getLines();
list.subList(m, n).forEach(System.out::println);


@Override
public void undo()








package com.onedirect.oodesign.textpad;

public class InsertCommand implements Command

private TextPad textPad;

private Integer line;

private String text;

public InsertCommand(TextPad textPad, Integer line, String text)
this.line = line;
this.textPad = textPad;
this.text = text;


@Override
public void execute()
this.textPad.getLines().add(line, text);


@Override
public void undo()
this.textPad.getLines().remove((int)line);





package com.onedirect.oodesign.textpad;

import java.util.ArrayList;
import java.util.List;
import java.util.Stack;

public class TextPad

private List<String> lines;

private Stack<Command> undo;

private Stack<Command> redo;

private List<String> clipBoard;

public TextPad()
this.lines = new ArrayList<>();
this.undo = new Stack<>();
this.redo = new Stack<>();
this.clipBoard = new ArrayList<>();




public List<String> getClipBoard()
return this.clipBoard;


public void setClipBoard(List<String> clipBoard)
this.clipBoard = clipBoard;


public List<String> getLines()
return lines;


public void display()
DisplayCommand displayCommand = new DisplayCommand(this);
displayCommand.execute();


public void display(int m, int n)
DisplayCommand displayCommand = new DisplayCommand(this, m, n);
displayCommand.execute();


public void insert(int n, String text)
clearRedo();
InsertCommand insertCommand = new InsertCommand(this, n, text);
insertCommand.execute();
undo.push(insertCommand);


public void delete(int n)
delete(n, n);


public void delete(int n, int m)
clearRedo();
DeleteCommand deleteCommand = new DeleteCommand(this, n, m);
deleteCommand.execute();
undo.push(deleteCommand);


public void copy(int n, int m)
clearRedo();
CopyCommand copyCommand = new CopyCommand(this, n, m);
copyCommand.execute();


public void paste(int n)
clearRedo();
PasteCommand pasteCommand = new PasteCommand(this, n);
pasteCommand.execute();
undo.push(pasteCommand);


public void undo()
if(!undo.isEmpty())
Command command = undo.pop();
command.undo();
redo.push(command);



public void redo()
if(!redo.isEmpty())
Command command = redo.pop();
command.execute();
undo.push(command);



private void clearRedo()
while (!redo.isEmpty())
redo.pop();






enter image description here










share|improve this question









New contributor




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Check out our Code of Conduct.







$endgroup$
















    0












    $begingroup$


    I was asked to code a TextPad with following functionality:
    display() – to display the entire content



    display(n, m) – to display from line n to m



    insert(n, text) – to insert text at line n



    delete(n) – delete line n



    delete(n, m) – delete from line n to m



    copy(n, m) – copy contents from line n to m to clipboard



    paste(n) – paste contents from clipboard to line n



    undo() – undo last command



    redo() – redo last command



    They expected the textpad to be in memory (not as file). They also expected to handle error gracefully and the program to be menu driven.



    Can someone please review the class structure implemented. Can it be improved so that code can be easily modified and extended?



    public interface Command 

    void execute();

    void undo();





    package com.onedirect.oodesign.textpad;

    public class PasteCommand implements Command

    private TextPad textPad;

    private Integer line;

    public PasteCommand(TextPad textPad, Integer line)
    this.textPad = textPad;
    this.line = line;


    @Override
    public void execute()
    this.textPad.getLines().addAll(line, this.textPad.getClipBoard());


    @Override
    public void undo()
    for (int i = line; i < this.textPad.getClipBoard().size(); i++)
    this.textPad.getLines().remove(i);








    package com.onedirect.oodesign.textpad;

    public class CopyCommand implements Command

    private TextPad textPad;

    private Integer from;

    private Integer to;

    public CopyCommand(TextPad textPad, Integer from, Integer to)
    this.textPad = textPad;
    this.from = from;
    this.to = to;



    @Override
    public void execute()
    this.textPad.setClipBoard(this.textPad.getLines().subList(from, to));


    @Override
    public void undo()







    package com.onedirect.oodesign.textpad;

    import java.util.List;

    public class DeleteCommand implements Command


    private TextPad textPad;

    private Integer from;

    private Integer to;

    private List<String> lines;

    public DeleteCommand(TextPad textPad, Integer from, Integer to)
    this.textPad = textPad;
    this.from = from;
    this.to =to;


    @Override
    public void execute()
    List<String> content = textPad.getLines();
    this.lines = content.subList(from, to);
    for (int i = from; i < to && i<content.size(); i++)
    content.remove(i);



    @Override
    public void undo()
    List<String> content = textPad.getLines();
    content.addAll(from, this.lines);





    package com.onedirect.oodesign.textpad;

    import java.util.List;

    public class DisplayCommand implements Command


    private TextPad textPad;

    private int m;

    private int n;

    public DisplayCommand(TextPad textPad, int m, int n)
    this.textPad = textPad;
    this.m = m;
    this.n = n;

    public DisplayCommand(TextPad textPad)
    this.textPad = textPad;
    this.m = 0;
    this.n = this.textPad.getLines().size();


    @Override
    public void execute()
    List<String> list = this.textPad.getLines();
    list.subList(m, n).forEach(System.out::println);


    @Override
    public void undo()








    package com.onedirect.oodesign.textpad;

    public class InsertCommand implements Command

    private TextPad textPad;

    private Integer line;

    private String text;

    public InsertCommand(TextPad textPad, Integer line, String text)
    this.line = line;
    this.textPad = textPad;
    this.text = text;


    @Override
    public void execute()
    this.textPad.getLines().add(line, text);


    @Override
    public void undo()
    this.textPad.getLines().remove((int)line);





    package com.onedirect.oodesign.textpad;

    import java.util.ArrayList;
    import java.util.List;
    import java.util.Stack;

    public class TextPad

    private List<String> lines;

    private Stack<Command> undo;

    private Stack<Command> redo;

    private List<String> clipBoard;

    public TextPad()
    this.lines = new ArrayList<>();
    this.undo = new Stack<>();
    this.redo = new Stack<>();
    this.clipBoard = new ArrayList<>();




    public List<String> getClipBoard()
    return this.clipBoard;


    public void setClipBoard(List<String> clipBoard)
    this.clipBoard = clipBoard;


    public List<String> getLines()
    return lines;


    public void display()
    DisplayCommand displayCommand = new DisplayCommand(this);
    displayCommand.execute();


    public void display(int m, int n)
    DisplayCommand displayCommand = new DisplayCommand(this, m, n);
    displayCommand.execute();


    public void insert(int n, String text)
    clearRedo();
    InsertCommand insertCommand = new InsertCommand(this, n, text);
    insertCommand.execute();
    undo.push(insertCommand);


    public void delete(int n)
    delete(n, n);


    public void delete(int n, int m)
    clearRedo();
    DeleteCommand deleteCommand = new DeleteCommand(this, n, m);
    deleteCommand.execute();
    undo.push(deleteCommand);


    public void copy(int n, int m)
    clearRedo();
    CopyCommand copyCommand = new CopyCommand(this, n, m);
    copyCommand.execute();


    public void paste(int n)
    clearRedo();
    PasteCommand pasteCommand = new PasteCommand(this, n);
    pasteCommand.execute();
    undo.push(pasteCommand);


    public void undo()
    if(!undo.isEmpty())
    Command command = undo.pop();
    command.undo();
    redo.push(command);



    public void redo()
    if(!redo.isEmpty())
    Command command = redo.pop();
    command.execute();
    undo.push(command);



    private void clearRedo()
    while (!redo.isEmpty())
    redo.pop();






    enter image description here










    share|improve this question









    New contributor




    Manu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.







    $endgroup$














      0












      0








      0


      0



      $begingroup$


      I was asked to code a TextPad with following functionality:
      display() – to display the entire content



      display(n, m) – to display from line n to m



      insert(n, text) – to insert text at line n



      delete(n) – delete line n



      delete(n, m) – delete from line n to m



      copy(n, m) – copy contents from line n to m to clipboard



      paste(n) – paste contents from clipboard to line n



      undo() – undo last command



      redo() – redo last command



      They expected the textpad to be in memory (not as file). They also expected to handle error gracefully and the program to be menu driven.



      Can someone please review the class structure implemented. Can it be improved so that code can be easily modified and extended?



      public interface Command 

      void execute();

      void undo();





      package com.onedirect.oodesign.textpad;

      public class PasteCommand implements Command

      private TextPad textPad;

      private Integer line;

      public PasteCommand(TextPad textPad, Integer line)
      this.textPad = textPad;
      this.line = line;


      @Override
      public void execute()
      this.textPad.getLines().addAll(line, this.textPad.getClipBoard());


      @Override
      public void undo()
      for (int i = line; i < this.textPad.getClipBoard().size(); i++)
      this.textPad.getLines().remove(i);








      package com.onedirect.oodesign.textpad;

      public class CopyCommand implements Command

      private TextPad textPad;

      private Integer from;

      private Integer to;

      public CopyCommand(TextPad textPad, Integer from, Integer to)
      this.textPad = textPad;
      this.from = from;
      this.to = to;



      @Override
      public void execute()
      this.textPad.setClipBoard(this.textPad.getLines().subList(from, to));


      @Override
      public void undo()







      package com.onedirect.oodesign.textpad;

      import java.util.List;

      public class DeleteCommand implements Command


      private TextPad textPad;

      private Integer from;

      private Integer to;

      private List<String> lines;

      public DeleteCommand(TextPad textPad, Integer from, Integer to)
      this.textPad = textPad;
      this.from = from;
      this.to =to;


      @Override
      public void execute()
      List<String> content = textPad.getLines();
      this.lines = content.subList(from, to);
      for (int i = from; i < to && i<content.size(); i++)
      content.remove(i);



      @Override
      public void undo()
      List<String> content = textPad.getLines();
      content.addAll(from, this.lines);





      package com.onedirect.oodesign.textpad;

      import java.util.List;

      public class DisplayCommand implements Command


      private TextPad textPad;

      private int m;

      private int n;

      public DisplayCommand(TextPad textPad, int m, int n)
      this.textPad = textPad;
      this.m = m;
      this.n = n;

      public DisplayCommand(TextPad textPad)
      this.textPad = textPad;
      this.m = 0;
      this.n = this.textPad.getLines().size();


      @Override
      public void execute()
      List<String> list = this.textPad.getLines();
      list.subList(m, n).forEach(System.out::println);


      @Override
      public void undo()








      package com.onedirect.oodesign.textpad;

      public class InsertCommand implements Command

      private TextPad textPad;

      private Integer line;

      private String text;

      public InsertCommand(TextPad textPad, Integer line, String text)
      this.line = line;
      this.textPad = textPad;
      this.text = text;


      @Override
      public void execute()
      this.textPad.getLines().add(line, text);


      @Override
      public void undo()
      this.textPad.getLines().remove((int)line);





      package com.onedirect.oodesign.textpad;

      import java.util.ArrayList;
      import java.util.List;
      import java.util.Stack;

      public class TextPad

      private List<String> lines;

      private Stack<Command> undo;

      private Stack<Command> redo;

      private List<String> clipBoard;

      public TextPad()
      this.lines = new ArrayList<>();
      this.undo = new Stack<>();
      this.redo = new Stack<>();
      this.clipBoard = new ArrayList<>();




      public List<String> getClipBoard()
      return this.clipBoard;


      public void setClipBoard(List<String> clipBoard)
      this.clipBoard = clipBoard;


      public List<String> getLines()
      return lines;


      public void display()
      DisplayCommand displayCommand = new DisplayCommand(this);
      displayCommand.execute();


      public void display(int m, int n)
      DisplayCommand displayCommand = new DisplayCommand(this, m, n);
      displayCommand.execute();


      public void insert(int n, String text)
      clearRedo();
      InsertCommand insertCommand = new InsertCommand(this, n, text);
      insertCommand.execute();
      undo.push(insertCommand);


      public void delete(int n)
      delete(n, n);


      public void delete(int n, int m)
      clearRedo();
      DeleteCommand deleteCommand = new DeleteCommand(this, n, m);
      deleteCommand.execute();
      undo.push(deleteCommand);


      public void copy(int n, int m)
      clearRedo();
      CopyCommand copyCommand = new CopyCommand(this, n, m);
      copyCommand.execute();


      public void paste(int n)
      clearRedo();
      PasteCommand pasteCommand = new PasteCommand(this, n);
      pasteCommand.execute();
      undo.push(pasteCommand);


      public void undo()
      if(!undo.isEmpty())
      Command command = undo.pop();
      command.undo();
      redo.push(command);



      public void redo()
      if(!redo.isEmpty())
      Command command = redo.pop();
      command.execute();
      undo.push(command);



      private void clearRedo()
      while (!redo.isEmpty())
      redo.pop();






      enter image description here










      share|improve this question









      New contributor




      Manu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.







      $endgroup$




      I was asked to code a TextPad with following functionality:
      display() – to display the entire content



      display(n, m) – to display from line n to m



      insert(n, text) – to insert text at line n



      delete(n) – delete line n



      delete(n, m) – delete from line n to m



      copy(n, m) – copy contents from line n to m to clipboard



      paste(n) – paste contents from clipboard to line n



      undo() – undo last command



      redo() – redo last command



      They expected the textpad to be in memory (not as file). They also expected to handle error gracefully and the program to be menu driven.



      Can someone please review the class structure implemented. Can it be improved so that code can be easily modified and extended?



      public interface Command 

      void execute();

      void undo();





      package com.onedirect.oodesign.textpad;

      public class PasteCommand implements Command

      private TextPad textPad;

      private Integer line;

      public PasteCommand(TextPad textPad, Integer line)
      this.textPad = textPad;
      this.line = line;


      @Override
      public void execute()
      this.textPad.getLines().addAll(line, this.textPad.getClipBoard());


      @Override
      public void undo()
      for (int i = line; i < this.textPad.getClipBoard().size(); i++)
      this.textPad.getLines().remove(i);








      package com.onedirect.oodesign.textpad;

      public class CopyCommand implements Command

      private TextPad textPad;

      private Integer from;

      private Integer to;

      public CopyCommand(TextPad textPad, Integer from, Integer to)
      this.textPad = textPad;
      this.from = from;
      this.to = to;



      @Override
      public void execute()
      this.textPad.setClipBoard(this.textPad.getLines().subList(from, to));


      @Override
      public void undo()







      package com.onedirect.oodesign.textpad;

      import java.util.List;

      public class DeleteCommand implements Command


      private TextPad textPad;

      private Integer from;

      private Integer to;

      private List<String> lines;

      public DeleteCommand(TextPad textPad, Integer from, Integer to)
      this.textPad = textPad;
      this.from = from;
      this.to =to;


      @Override
      public void execute()
      List<String> content = textPad.getLines();
      this.lines = content.subList(from, to);
      for (int i = from; i < to && i<content.size(); i++)
      content.remove(i);



      @Override
      public void undo()
      List<String> content = textPad.getLines();
      content.addAll(from, this.lines);





      package com.onedirect.oodesign.textpad;

      import java.util.List;

      public class DisplayCommand implements Command


      private TextPad textPad;

      private int m;

      private int n;

      public DisplayCommand(TextPad textPad, int m, int n)
      this.textPad = textPad;
      this.m = m;
      this.n = n;

      public DisplayCommand(TextPad textPad)
      this.textPad = textPad;
      this.m = 0;
      this.n = this.textPad.getLines().size();


      @Override
      public void execute()
      List<String> list = this.textPad.getLines();
      list.subList(m, n).forEach(System.out::println);


      @Override
      public void undo()








      package com.onedirect.oodesign.textpad;

      public class InsertCommand implements Command

      private TextPad textPad;

      private Integer line;

      private String text;

      public InsertCommand(TextPad textPad, Integer line, String text)
      this.line = line;
      this.textPad = textPad;
      this.text = text;


      @Override
      public void execute()
      this.textPad.getLines().add(line, text);


      @Override
      public void undo()
      this.textPad.getLines().remove((int)line);





      package com.onedirect.oodesign.textpad;

      import java.util.ArrayList;
      import java.util.List;
      import java.util.Stack;

      public class TextPad

      private List<String> lines;

      private Stack<Command> undo;

      private Stack<Command> redo;

      private List<String> clipBoard;

      public TextPad()
      this.lines = new ArrayList<>();
      this.undo = new Stack<>();
      this.redo = new Stack<>();
      this.clipBoard = new ArrayList<>();




      public List<String> getClipBoard()
      return this.clipBoard;


      public void setClipBoard(List<String> clipBoard)
      this.clipBoard = clipBoard;


      public List<String> getLines()
      return lines;


      public void display()
      DisplayCommand displayCommand = new DisplayCommand(this);
      displayCommand.execute();


      public void display(int m, int n)
      DisplayCommand displayCommand = new DisplayCommand(this, m, n);
      displayCommand.execute();


      public void insert(int n, String text)
      clearRedo();
      InsertCommand insertCommand = new InsertCommand(this, n, text);
      insertCommand.execute();
      undo.push(insertCommand);


      public void delete(int n)
      delete(n, n);


      public void delete(int n, int m)
      clearRedo();
      DeleteCommand deleteCommand = new DeleteCommand(this, n, m);
      deleteCommand.execute();
      undo.push(deleteCommand);


      public void copy(int n, int m)
      clearRedo();
      CopyCommand copyCommand = new CopyCommand(this, n, m);
      copyCommand.execute();


      public void paste(int n)
      clearRedo();
      PasteCommand pasteCommand = new PasteCommand(this, n);
      pasteCommand.execute();
      undo.push(pasteCommand);


      public void undo()
      if(!undo.isEmpty())
      Command command = undo.pop();
      command.undo();
      redo.push(command);



      public void redo()
      if(!redo.isEmpty())
      Command command = redo.pop();
      command.execute();
      undo.push(command);



      private void clearRedo()
      while (!redo.isEmpty())
      redo.pop();






      enter image description here







      java object-oriented design-patterns text-editor






      share|improve this question









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      Manu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      share|improve this question









      New contributor




      Manu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question








      edited 7 mins ago









      200_success

      130k17153419




      130k17153419






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      asked 10 hours ago









      ManuManu

      111




      111




      New contributor




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      New contributor





      Manu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      Manu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.




















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