Question

I’m trying to store the Civil Spanish Code.

It is divided in this way:

Books

----Chapters

--------Articles

OR

Books

----Titles

--------Chapters

-------------Articles

OR

Books

----Titles

--------Chapters

-------------Sections

-----------------Articles

Books, titles, chapters and sections have to store an int identifier and a String with the name of the book, title, etc. The number of elements are variable since some books have more chapters than others, for example.

Articles have to store and int identifier and a String with the content of the article.

I would apreciate an example of declaration and usage (in data, out data) of the structure since (for me) it’s a bit complex.

Answer 1

Rather create a Tree structure of Nodes, as follows (this is a psedo-code that can help you):

public interface Node {
    public int getId();
    public String getName();

    public void saveTo(SaveVisitor visitor);
}

public abstract class AbstractNode {
    public List<Node> children;

    //Getters
    public List<Node> getChildren() { return children; }

    public void addChild(Node node) {
        if (children == null) {
            children = new ArrayList<Node>();
        }

        children.add(node);
    }

    @Override
    public void saveTo(SaveVisitor visitor) {
        if (visitor != null) {
            visitor.setId(getId());
            visitor.setName(getName());

            if (children != null) {
                for (Node child: children) {
                    child.saveTo(visitor);
                }
            }
        }
    }
}


public class Book extends AbstractNode {

}

public class Title extends AbstractNode {

}

public class Chapter extends AbstractNode {

}

public class Section extends AbstractNode {

}

public class Article extends AbstractNode {

}

Your SaveVisitor can be any visitor that accepts ID, Name, and the subclasses can be of any format (XML, JSON, Structured plaintext, Excel, etc.).