TransformingList.java

/*
 * Class:        TransformingList
 * Description:  List that dynamically transforms the elements of another list.
 * Environment:  Java
 * Software:     SSJ 
 * Copyright (C) 2001  Pierre L'Ecuyer and Universite de Montreal
 * Organization: DIRO, Universite de Montreal
 * @author       
 * @since
 *
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package umontreal.ssj.util;
 
import java.util.AbstractList;
import java.util.List;
import java.util.Iterator;
import java.util.ListIterator;

public abstract class TransformingList<OE, IE> extends AbstractList<OE> {
   private List<IE> fromList;

   public TransformingList(List<IE> fromList) {
      this.fromList = fromList;
   }
 
   public List<IE> getInnerList() {
      return fromList;
   }

   public abstract OE convertFromInnerType(IE e);

   public abstract IE convertToInnerType(OE e);
 
   public void add(int index, OE element) {
      IE fe = convertToInnerType(element);
      fromList.add(fe);
   }
 
   @Override
   public void clear() {
      fromList.clear();
   }
 
   @Override
   public OE get(int index) {
      return convertFromInnerType(fromList.get(index));
   }
 
   public Iterator<OE> iterator() {
      return new MyIterator(fromList.iterator());
   }
 
   public ListIterator<OE> listIterator() {
      return new MyListIterator(fromList.listIterator());
   }
 
   public ListIterator<OE> listIterator(int index) {
      return new MyListIterator(fromList.listIterator(index));
   }
 
   @Override
   public OE remove(int index) {
      return convertFromInnerType(fromList.remove(index));
   }
 
   @Override
   public OE set(int index, OE element) {
      IE from = convertToInnerType(element);
      from = fromList.set(index, from);
      return convertFromInnerType(from);
   }
 
   @Override
   public int size() {
      return fromList.size();
   }
 
   private class MyIterator implements Iterator<OE> {
      private Iterator<IE> itr;
 
      public MyIterator(Iterator<IE> itr) {
         this.itr = itr;
      }
 
      public boolean hasNext() {
         return itr.hasNext();
      }
 
      public OE next() {
         return convertFromInnerType(itr.next());
      }
 
      public void remove() {
         itr.remove();
      }
   }
 
   private class MyListIterator implements ListIterator<OE> {
      private ListIterator<IE> itr;
 
      public MyListIterator(ListIterator<IE> itr) {
         this.itr = itr;
      }
 
      public void add(OE o) {
         IE fe = convertToInnerType(o);
         itr.add(fe);
      }
 
      public boolean hasNext() {
         return itr.hasNext();
      }
 
      public boolean hasPrevious() {
         return itr.hasPrevious();
      }
 
      public OE next() {
         return convertFromInnerType(itr.next());
      }
 
      public int nextIndex() {
         return itr.nextIndex();
      }
 
      public OE previous() {
         return convertFromInnerType(itr.previous());
      }
 
      public int previousIndex() {
         return itr.previousIndex();
      }
 
      public void remove() {
         itr.remove();
      }
 
      public void set(OE o) {
         IE fe = convertToInnerType(o);
         itr.set(fe);
      }
   }
 
}