ComponentIterator.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 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.zkoss.util;
 
import java.lang.reflect.ParameterizedType;
import org.zkoss.zk.ui.Component;
 
public abstract class ComponentIterator<T> {
  
  private final Class<T> jclass;
  
  public ComponentIterator(Component component) {
    this.jclass = (Class<T>) ((ParameterizedType) getClass()
            .getGenericSuperclass()).getActualTypeArguments()[0];
    checkComponent(component);
  }
  
  protected final void checkComponent(Component comp) {
    if(jclass.isAssignableFrom(comp.getClass())) {
      doComponent((T) comp);
    }
    for(Object obj : comp.getChildren()) {
      if(obj instanceof Component) {
        checkComponent((Component) obj);
      }
    }
  }
 
  protected abstract void doComponent(T component);
  
}