package command;

public class DeleteCommand implements Command {
    private final TextEditor editor;
    private final int start;
    private final int length;
    private String deletedText;  // saved for undo

    public DeleteCommand(TextEditor editor, int start, int length) {
        this.editor = editor;
        this.start  = start;
        this.length = length;
    }

    @Override
    public void execute() {
        deletedText = editor.getText().substring(start, start + length);
        editor.deleteText(start, length);
    }

    @Override public void undo() { editor.insertText(deletedText, start); }
    @Override public String getDescription() { return "Delete " + length + " chars at " + start; }
}