Java - Help creating an object of my type from other classes

I'm new to SO. I need a help or a tip with this problem that I have. I do not need a complete solution, nor code. If not just help how to think or start.

I have 3 predefined classes:

• GraphDescriptor
• NodeDescriptor
• LinkDescriptor

GraphDescriptor:

public class GraphDescriptor {
    public Set<NodeDescriptor> nodes;

    public GraphDescriptor() {
        nodes = new HashSet<NodeDescriptor>();
    }

    public Set<NodeDescriptor> getNodes() {
        return nodes;
    }

    public void setNodes(Set<NodeDescriptor> nodes) {
        this.nodes = nodes;
    }
}

NodeDescriptor:

public class NodeDescriptor {
    private Set<LinkDescriptor> links;

    public NodeDescriptor() {
        links = new HashSet<LinkDescriptor>();
    }

    public Set<LinkDescriptor> getLinks() {
        return links;
    }

    public void setLinks(Set<LinkDescriptor> links) {
        this.links = links;
    }
}

LinkDescriptor:

public class LinkDescriptor {
    private NodeDescriptor sourceNode; //a Descriptor for the source node of the link
    private NodeDescriptor destinationNode; // a Descriptor for the destination node of the link

    public LinkDescriptor() {
    }

    public NodeDescriptor getSourceNode() {
        return sourceNode;
    }

    public void setSourceNode(NodeDescriptor sourceNode) {
        this.sourceNode = sourceNode;
    }

    public NodeDescriptor getDestinationNode() {
        return destinationNode;
    }

    public void setDestinationNode(NodeDescriptor destinationNode) {
        this.destinationNode = destinationNode;
    }

}

On the other hand I have MY classes: myGraph, Nodes, Links, Node and Link:

myGraph:

        public class MyGraph {

            protected Nodes nodes;
            protected Links links;
            protected String name;

            public Nodes getNodes() {
                return nodes;
            }

            public void setNodes(Nodes value) {
                this.nodes = value;
            }

            public Links getLinks() {
                return links;
            }

           public void setLinks(Links value) {
                this.links = value;
            }

            public String getName() {
                return name;
            }

            public void setName(String value) {
                this.name = value;
           }
    }

Nodes:

    public class Nodes {

        protected List<Nodes.Node> node;

        public List<Nodes.Node> getNode() {
            if (node == null) {
                node = new ArrayList<Nodes.Node>();
            }
            return this.node;
        }

Node:

        public static class Node {

            protected String name;

            public String getName() {
                return name;
            }

            public void setName(String value) {
                this.name = value;
            }
    }

Links:

        public class Links {

            protected List<Links.Link> link;

            public List<Links.Link> getLink() {
                if (link == null) {
                    link = new ArrayList<Links.Link>();
                }
                return this.link;
            }
    }

Link

public static class Link {

        protected String name;
        protected String source;
        protected String destination;


        public String getName() {
            return name;
        }

        public void setName(String value) {
            this.name = value;
        }
        public String getSource() {
            return source;
        }

        public void setSource(String value) {
            this.source = value;
        }

        public String getDestination() {
            return destination;
        }

        public void setDestination(String value) {
            this.destination = value;
        }
}

What I need is CREATE AN OBJECT OF MY TYPE (MyGraph) given a GraphDescriptor object.

The problem is that the descriptor objects (Node or Link) do not have a name or identification and I can not find a way to interconnect them.

First, I can start by creating a MyGraph object, then I can create a new Node for each NodeDescriptor belonging to the NodeDescriptors set of the GraphDescriptor.

Afterwards, for each NodeDescriptor I can go through its set of LinkDescriptors, set this node as source and create a new node as a destination. And continue like this until the last node.

But in the end I will have these nodes each connected with links with their new nodes but between these there will be no connection. That is, I will not have a complete system, but several mini systems not connected. That's the problem, I do not know how to join or connect them.

I hope the doubt has been clear and anything you can ask me. Thanks !!

(I translated the question, since it was in English and this is SOes.)