/**
    * This file Copyright (c) 2003-2014 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.cms.gui.dialog;
  
  import info.magnolia.cms.beans.config.ObservedManager;
  import info.magnolia.cms.core.Content;
  import info.magnolia.cms.core.ItemType;
  import info.magnolia.objectfactory.Classes;
  import info.magnolia.objectfactory.Components;
  
  import java.util.Iterator;
  
  import javax.inject.Singleton;
  
  import org.apache.commons.lang.StringUtils;
  
  
  /**
   * @author Fabrizio Giustina
   * @version $Revision$ ($Author$)
   */
  @Singleton
  public final class ControlsManager extends ObservedManager {
  
      /**
       * Node data name for control class.
       */
      private static final String DATA_CONTROL_CLASS = "class"; //$NON-NLS-1$
  
      /**
       * Node data name for control name.
       */
      private static final String DATA_CONTROL_NAME = "name"; //$NON-NLS-1$
  
      /**
       * Registers dialog controls.
       */
      @Override
      protected void onRegister(Content configNode) {
          log.info("Loading dialog controls configuration from {}", configNode.getHandle()); //$NON-NLS-1$
  
          Iterator iterator = configNode.getChildren(ItemType.CONTENTNODE).iterator();
  
          while (iterator.hasNext()) {
              Content controlNode = (Content) iterator.next();
  
              log.debug("Initializing control [{}]", controlNode); //$NON-NLS-1$
  
              String classNodeData = controlNode.getNodeData(DATA_CONTROL_CLASS).getString();
              String nameNodeData = controlNode.getNodeData(DATA_CONTROL_NAME).getString();
  
              if (StringUtils.isEmpty(nameNodeData)) {
                  nameNodeData = controlNode.getName();
              }
  
              if (StringUtils.isEmpty(classNodeData) || StringUtils.isEmpty(nameNodeData)) {
                  log.warn("Can't add custom control with name [{}] and class [{}] specified in node [{}]", new Object[]{nameNodeData, classNodeData, controlNode.getName()});
                  continue;
              }
              Class controlClass = null;
  
              try {
                  controlClass = Classes.getClassFactory().forName(classNodeData);
              }
              catch (ClassNotFoundException e) {
                  log.error("Failed to load dialog control with class [" + classNodeData + "]", e); //$NON-NLS-1$
                  continue;
              }
 
             if (!DialogControl.class.isAssignableFrom(controlClass)) {
                 log.error("Invalid class specified for control [{}]: does not implement DialogControl", nameNodeData);
                 continue;
             }
 
             DialogFactory.registerDialog(nameNodeData, controlClass);
 
         }
     }
 
     /**
      * @return Returns the instance.
      */
     public static ControlsManager getInstance() {
         return Components.getSingleton(ControlsManager.class);
     }
 
     @Override
     protected void onClear() {
     }
 
 }