Components.java

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/*
 * 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.util;
 
import org.turro.reflection.Reflections;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.impl.PageImpl;
 
public class Components {
 
  public <T> T parent(Class<T> jClass) {
    if(component instanceof PageImpl page) {
      return Components.from(page.getOwner()).parent(jClass);
    } else if(component instanceof Component comp) {
      while((comp = comp.getParent()) != null) {
        if(Reflections.of(comp).representsClass(jClass)) {
          return (T) comp;
        }
      }
    }
    return null;
  }
  
  /* Factory */
 
  public static Components from(Object component) {
    return new Components(component);
  }
  
  private Object component;
  
  private Components(Object component) {
    this.component = component;
  }
  
}