AbstractSessionObject.java

Go to the documentation of this file.

/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2022 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.elephant.context;
 
import java.util.function.Supplier;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public abstract class AbstractSessionObject<E> {
 
  /* Factory */
  
  public static <E> E get(String key, Supplier<E> supplier) {
    return get(Application.getApplication().getConstructor(), key, supplier);
  }
 
  public static <E> E get(HttpServletRequest request, HttpServletResponse response, String key, Supplier<E> supplier) {
    return get(ElephantContext.getConstructor(request, response), key, supplier);
  }
 
  public static <E> E get(IConstructor constructor, String key, Supplier<E> supplier) {
    if(constructor != null && !constructor.isHeadless()) {
      E object = (E) constructor.getSessionAttribute(key);
      if(object == null) {
        object = supplier.get();
        constructor.setSessionAttribute(key, object);
      }
      return object;
    }
    return supplier.get();
  }
  
  public static void remove(String key) {
    remove(Application.getApplication().getConstructor(), key);
  }
 
  public static void remove(HttpServletRequest request, HttpServletResponse response, String key) {
    remove(ElephantContext.getConstructor(request, response), key);
  }
 
  public static void remove(IConstructor constructor, String key) {
    if(constructor != null && !constructor.isHeadless()) {
      constructor.removeSessionAttribute(key);
    }
  }
  
}