DaoManager.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2021 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;
 
import java.io.Closeable;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import javax.persistence.criteria.CriteriaDelete;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.CriteriaUpdate;
import org.turro.elephant.context.ElephantContext;
import org.turro.util.AtomicCounter;
 
public class DaoManager implements Closeable {
  
  private final Dao dao;
  private final EntityManager manager;
 
  public DaoManager(Dao dao) {
    this.dao = dao;
    this.manager = dao.createEntityManager();
    openManagers.increment();
  }
 
  public <T> T saveObject(T obj) {
    try {
      obj = manager.merge(obj);
    } catch (Exception ex) {
      Logger.getLogger(DaoManager.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
    } finally {
      return obj;
    }
  }
  
  public void persist(Object obj) {
    try {
      manager.persist(obj);
    } catch (Exception ex) {
      Logger.getLogger(DaoManager.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
    }
  }
 
  public <T> T find(Class<T> javaClass, Object arg) {
    return manager.find(javaClass, arg);
  }
  
  public void remove(Object obj) {
    manager.remove(obj);
  }
 
  public <T> Query createQuery(CriteriaQuery<T> query) {
    return manager.createQuery(query);
  }
  
  public <T> Query createQuery(String clause, Class<T> javaClass) {
    return manager.createQuery(clause, javaClass);
  }
 
  public Query createQuery(String clause) {
    return manager.createQuery(clause);
  }
 
  public Query createQuery(CriteriaDelete delete) {
    return manager.createQuery(delete);
  }
 
  public Query createQuery(CriteriaUpdate update) {
    return manager.createQuery(update);
  }
 
  public Query createNativeQuery(String clause, Class resultClass) {
    return manager.createNativeQuery(clause, resultClass);
  }
 
  public Query createNativeQuery(String clause) {
    return manager.createNativeQuery(clause);
  }
 
  public void setNamedParameters(Query q, Map<String, Object> parameters) {
    for (Map.Entry<String, Object> e : parameters.entrySet()) {
      q.setParameter(e.getKey(), e.getValue());
    }
  }
 
  public void clear() {
    manager.clear();
  }
 
  public EntityManager getManager() {
    return manager;
  }
 
  public Dao getDao() {
    return dao;
  }
  
  @Override
  public void close() {
    manager.close();
    openManagers.decrement();
  }
 
  public boolean isClosed() {
    return !manager.isOpen();
  }
  
  /* Debug */
  
  private static final AtomicCounter openManagers = new AtomicCounter();
 
  public static AtomicCounter getCounter() {
    return openManagers;
  }
 
}