package fr.ifremer.tutti.service.csv;
   
   /*
    * #%L
    * Tutti :: Service
    * $Id:$
    * $HeadURL:$
    * %%
    * Copyright (C) 2012 - 2015 Ifremer
   * %%
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU 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 General Public License for more details.
   * 
   * You should have received a copy of the GNU General Public
   * License along with this program.  If not, see
   * <http://www.gnu.org/licenses/gpl-3.0.html>.
   * #L%
   */
  
  import org.apache.commons.beanutils.NestedNullException;
  import org.apache.commons.beanutils.PropertyUtils;
  import org.nuiton.csv.ValueGetter;
  
  import java.lang.reflect.InvocationTargetException;
  import java.util.Collection;
  
  /**
   * Created on 2/5/15.
   *
   * @author Tony Chemit - chemit@codelutin.com
   * @since 3.13
   */
  public class BeanIndexNullableGetter<E, T> implements ValueGetter<E, T> {
  
      protected String collectionName;
  
      protected int order;
  
      protected String propertyName;
  
      BeanIndexNullableGetter(String collectionName, int order, String suffix) {
          this.collectionName = collectionName;
          this.order = order;
          this.propertyName = collectionName + "[" + order + "]." + suffix;
  
      }
  
      @Override
      public T get(E object) throws Exception {
          T value = null;
          try {
              Collection c = (Collection) PropertyUtils.getProperty(object, collectionName);
              if (c != null && order < c.size()) {
                  value = (T) PropertyUtils.getProperty(object, propertyName);
              }
          } catch (NestedNullException e) {
              value = null;
          } catch (InvocationTargetException e) {
              if (e.getCause() instanceof NullPointerException) {
                  value = null;
              } else {
                  throw e;
              }
          }
          return value;
      }
  }