DaoTree.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2013 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.jpa.iterator;
 
import java.util.List;
import org.turro.collections.Item;
import org.turro.collections.Tree;
import org.turro.elephant.db.WhereClause;
import org.turro.jpa.Dao;
 
public abstract class DaoTree<E, ID> extends Tree<E, ID> {
  
  protected Dao dao;
 
  public DaoTree(Dao dao) {
    this.dao = dao;
  }
 
  public Dao getDao() {
    return dao;
  }
  
  public void fillTree(String path) {
    setPath(path);
    WhereClause childrenClause = getChildrenClause(path);
    if(childrenClause != null) {
      for(E e : (List<E>) dao.getResultList(childrenClause)) {
        if(e != null) {
          Item i = addRoot(e, getId(e));
          if(i != null) {
            fillRoot(i);
          }
        }
      }
    }
    WhereClause leafClause = getLeafClause(path);
    if(leafClause != null) {
      for(E e : (List<E>) dao.getResultList(leafClause)) {
        if(e != null) {
          addLeaf(e, getId(e));
        }
      }
    }
  }
  
  public void fillRoot(Item item) {
    WhereClause childrenClause = getChildrenClause(item.getPath());
    if(childrenClause != null) {
      for(E e : (List<E>) dao.getResultList(childrenClause)) {
        if(e != null) {
          Item i = item.addChild(this, item, e, getId(e));
          fillRoot(i);
        }
      }
    }
    WhereClause leafClause = getLeafClause(item.getPath());
    if(leafClause != null) {
      for(E e : (List<E>) dao.getResultList(leafClause)) {
        if(e != null) {
          item.addLeaf(this, item, e, getId(e));
        }
      }
    }
  }
 
  protected abstract WhereClause getChildrenClause(String currPath);
  protected abstract WhereClause getLeafClause(String currPath);
  
}