AbstractSessionContext.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2023 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.io.Serializable;
import java.util.function.Supplier;
import org.turro.collections.Attributes;
 
public abstract class AbstractSessionContext implements Serializable {
 
  /* Attributes */
  
  public Attributes getAttributes() {  
    return attributes;
  }
 
  /* Constructor */
  
  private IConstructor constructor;
 
  public IConstructor getConstructor() {
    return constructor;
  }
 
  protected void setConstructor(IConstructor constructor) {
    this.constructor = constructor;
  }
  
  /* Factory */
  
  protected static <T extends AbstractSessionContext> T getInstance(IConstructor constructor, String type, Supplier<T> onCreate) {
    String context = ElephantContext.getContextVariable(constructor) + type;
    T sessionContext = (T) constructor.getSessionAttribute(context);
    if(sessionContext == null) {
      sessionContext = onCreate.get();
      constructor.setSessionAttribute(context, sessionContext);
    }
    sessionContext.setConstructor(constructor);
    return sessionContext;
  }
  
  private final Attributes attributes;
 
  protected AbstractSessionContext() {
    this.attributes = new Attributes();
  }
 
}