/**
    * This file Copyright (c) 2013-2015 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.ui.form.field.transformer.composite;
  
  import info.magnolia.objectfactory.Components;
  import info.magnolia.ui.api.i18n.I18NAuthoringSupport;
  import info.magnolia.ui.form.field.definition.ConfiguredFieldDefinition;
  import info.magnolia.ui.form.field.transformer.basic.BasicTransformer;
  
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.commons.lang3.StringUtils;
  
  import com.vaadin.data.Item;
  import com.vaadin.data.Property;
  import com.vaadin.data.util.PropertysetItem;
  
  /**
   * Default composite field {@link info.magnolia.ui.form.field.transformer.Transformer} implementation storing and retrieving properties defined under an Item as {@link PropertysetItem} element.<br>
   * Storage strategy: <br>
   * - getValue(): <br>
   * -- iterate the fieldsName property and retrieve all stored property.<br>
   * -- Fulfill the {@link PropertysetItem}.<br>
   * - setValue(): <br>
   * -- iterate the incoming {@link PropertysetItem}.<br>
   * -- if the related parent item do not contain this property, add it.<br>
   */
  public class CompositeTransformer extends BasicTransformer<PropertysetItem> {
  
      protected List<String> fieldsName;
      protected String propertyPrefix;
  
      /**
       * @deprecated since 5.4.2 - use {@link #CompositeTransformer(Item, ConfiguredFieldDefinition, Class, List, I18NAuthoringSupport)} instead.
       */
      @Deprecated
      public CompositeTransformer(Item relatedFormItem, ConfiguredFieldDefinition definition, Class<PropertysetItem> type, List<String> fieldsName) {
          this(relatedFormItem, definition, type, fieldsName, Components.getComponent(I18NAuthoringSupport.class));
      }
  
      public CompositeTransformer(Item relatedFormItem, ConfiguredFieldDefinition definition, Class<PropertysetItem> type, List<String> fieldsName, I18NAuthoringSupport i18NAuthoringSupport) {
          super(relatedFormItem, definition, type, i18NAuthoringSupport);
          this.fieldsName = fieldsName;
          this.propertyPrefix = createPropertyPrefix(definition);
      }
  
      /**
       * @return propertyPrefix used to prefix the property name.
       */
      protected String createPropertyPrefix(ConfiguredFieldDefinition definition) {
          return definition.getName();
      }
  
      @Override
      public void writeToItem(PropertysetItem newValues) {
          // Get iterator.
          Iterator<?> propertyNames = newValues.getItemPropertyIds().iterator();
  
          while (propertyNames.hasNext()) {
              String propertyName = (String) propertyNames.next();
              String compositePropertyName = getCompositePropertyName(propertyName);
              Property<?> property = relatedFormItem.getItemProperty(compositePropertyName);
              if (property == null && newValues.getItemProperty(propertyName) != null) {
                  relatedFormItem.addItemProperty(compositePropertyName, newValues.getItemProperty(propertyName));
              }
          }
      }
 
     @Override
     public PropertysetItem readFromItem() {
         PropertysetItem newValues = new PropertysetItem();
         for (String propertyName : fieldsName) {
             String compositePropertyName = getCompositePropertyName(propertyName);
             if (relatedFormItem.getItemProperty(compositePropertyName) != null) {
                 newValues.addItemProperty(propertyName, relatedFormItem.getItemProperty(compositePropertyName));
             }
         }
         return newValues;
     }
 
     protected String getCompositePropertyName(String propertyName) {
         propertyName = propertyPrefix + propertyName;
         if (hasI18NSupport()) {
             propertyName = propertyName + StringUtils.difference(basePropertyName, i18NPropertyName);
         }
         return propertyName;
     }
 }