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    • org.jboss.seam.xml.fieldset.CollectionFieldSet Maven / Gradle / Ivy

    /*
 * JBoss, Home of Professional Open Source
 * Copyright 2010, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.seam.xml.fieldset;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;

import org.jboss.seam.xml.model.XmlItem;
import org.jboss.seam.xml.util.TypeReader;
import org.jboss.seam.xml.util.XmlObjectConverter;

/**
 * class responsible for setting the value of collection properties.
 * 
 * It can deal with the following collection types: -Set -List -Collection
 * -SortedSet -HashSet -ArrayList -TreeSet -LinkedList
 * 
 * @author Stuart Douglas 
 * 
 */
public class CollectionFieldSet implements FieldValueObject
{
   FieldValueSetter field;
   List values;
   Class elementType;
   Class collectionType;

   public CollectionFieldSet(FieldValueSetter field, List items)
   {
      this.field = field;
      this.values = new ArrayList();
      discoverElementType();

      CFS setter;
      for (XmlItem i : items)
      {
         final Object fv = XmlObjectConverter.convert(elementType, i.getInnerText());

         setter = new CFS()
         {
            public void add(Collection o) throws IllegalAccessException
            {
               o.add(fv);
            }
         };

         values.add(setter);
      }

   }

   public void discoverElementType()
   {
      Type type = field.getGenericType();
      if (type instanceof ParameterizedType)
      {
         ParameterizedType parameterizedType = (ParameterizedType) type;

         if (parameterizedType.getRawType() == Collection.class)
         {
            collectionType = LinkedHashSet.class;
         }
         else if (parameterizedType.getRawType() == List.class)
         {
            collectionType = ArrayList.class;
         }
         else if (parameterizedType.getRawType() == Set.class)
         {
            collectionType = LinkedHashSet.class;
         }
         else if (parameterizedType.getRawType() == SortedSet.class)
         {
            collectionType = TreeSet.class;
         }
         else if (parameterizedType.getRawType() == HashSet.class)
         {
            collectionType = HashSet.class;
         }
         else if (parameterizedType.getRawType() == ArrayList.class)
         {
            collectionType = ArrayList.class;
         }
         else if (parameterizedType.getRawType() == LinkedList.class)
         {
            collectionType = LinkedList.class;
         }
         else if (parameterizedType.getRawType() == LinkedHashSet.class)
         {
            collectionType = LinkedHashSet.class;
         }
         else if (parameterizedType.getRawType() == TreeSet.class)
         {
            collectionType = TreeSet.class;
         }
         else
         {
            throw new RuntimeException("Could not determine element type for " + field.getDeclaringClass().getName() + "." + field.getName());
         }
         elementType = TypeReader.readClassFromType(parameterizedType.getActualTypeArguments()[0]);
      }
      else
      {
         throw new RuntimeException("Could not determine element type for " + field.getDeclaringClass().getName() + "." + field.getName());
      }

   }

   public void setValue(Object instance)
   {
      try
      {
         Collection res = collectionType.newInstance();
         field.set(instance, res);
         for (int i = 0; i < values.size(); ++i)
         {
            values.get(i).add(res);
         }
      }
      catch (Exception e)
      {
         throw new RuntimeException(e);
      }
   }

   interface CFS
   {
      void add(Collection o) throws IllegalAccessException;
   }

}
    
    
    
    

    




    
    
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