[jboss-user] [JBoss Seam] - inject into a non-component?

[laksu]

I have a wrapper class called Node implementing TreeNode from RichFaces. I try to avoid recursively populating the whole tree and so have a mechanism in there to populate each node as they are referred. And in conjunction with the "ajax" property of the tree component, I expect the individual population of the nodes happening in the ajax calls.
The class "Node" basically keeps a Map (required to be a Map by the tree) of my Category objects that are children of the wrapped Category object when populated.
I provide these details because I could not figure out what kind of a component the Node should be.
My proof of concept does not even start by populating the root node. I try to inject the session (I use Hibernate/session instead of JPA/em) but it is injected null or not injected.
So the question is if my "Node" should be a Seam component to have the Hibernate session injected and if so what kind of a scope I should put it in?

Here follows my Node class:


  | public class Node<E extends Treeable<E>> implements TreeNode {
  |     
  |     @In(create=true)
  |     private Session session;
  |     
  |     private E value;
  |     Node parent;
  |     
  |     public Node(E aValue, Node<E> parent) {
  |         value=aValue;
  |         this.parent=parent;
  |         System.out.println("initing Node with Treeable="+aValue.getName());
  |     }
  |     
  |     private Map<Long,Node<E>> dataMap;
  |     
  |     public Node(String className) {
  |         List<E> rooties;
  |         System.out.println("Expanding root. session is"+session);
  |         rooties=session.createQuery("from "+className+" where parent"+className+" is null")
  |         .list();
  |         
  |         System.out.println("Root has "+rooties.size()+" rooties");
  |         dataMap=new HashMap<Long,Node<E>>();
  |         for(E rootie:rooties){
  |             Node node=new Node(rootie,this);
  |             dataMap.put(rootie.getId(),node);
  |             System.out.println("Rootie :"+rootie.getName()+" was added to roots");
  |         }
  |         
  |         System.out.println("initing rooties done");
  |     }
  |     
  |     
  |     public Map<Long, Node<E>> getDataMap() {
  |         if (dataMap==null){
  |             List<E> children;
  |             System.out.println("Expanding Node:"+value);
  |             String className=value.getClass().getName();
  |             children=session.createQuery("from "+className+" where parent"+className+"= :parent")
  |             .setEntity("parent",value)
  |             .list();
  |             
  |             dataMap=new HashMap<Long,Node<E>>();
  |             for(E child:value.getChildren()){
  |                 Node node=new Node(child,this);
  |                 dataMap.put(child.getId(),node);
  |             }
  |         }
  |         return dataMap;
  |     }
  |     
  |     public Object getData() {
  |         return this;
  |     }
  |     
  |     public void setData(Object data) {
  |     }
  |     
  |     public boolean isLeaf() {
  |         return getDataMap().isEmpty();
  |     }
  |     
  |     public Iterator getChildren() {
  |         System.out.println("getChildren is called for:"+toString());
  |         return getDataMap().entrySet().iterator();
  |     }
  |     
  |     public TreeNode getChild(Object id) {
  |         return getDataMap().get(id);
  |     }
  |     
  |     public void addChild(Object identifier, TreeNode child) {
  |     }
  |     
  |     public void removeChild(Object id) {
  |     }
  |     
  |     public TreeNode getParent() {
  |         System.out.println("getParent is called  for:"+toString());
  |         return parent;
  |     }
  |     
  |     
  |     public void setParent(TreeNode treeNode) {
  |         System.out.println("setParent is called with:"+treeNode);
  |     }
  |     
  |     public String getType(){
  |         return (value==null)?"root":value.getType();
  |     }
  |     
  |     public String toString(){
  | ...
  |     }
  |     
  |     public String getName(){
  |         return value.getName();
  |     }
  | 
  |     public E getValue() {
  |         return value;
  |     }
  |     
  | }
  | 



View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4074495#4074495

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4074495