ShrinkList.java

/**
 *
 *     Copyright (C) norad.fr
 *
 *     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 fr.norad.visuwall.core.utils;

import java.util.Iterator;
import java.util.List;
import org.springframework.util.AutoPopulatingList;

public class ShrinkList<E> extends AutoPopulatingList<E> {

    private static final long serialVersionUID = 1L;

    public ShrinkList(Class<? extends E> elementClass) {
        super(elementClass);
    }

    /**
     * Decorates list with shrinkable lazy list.
     */
    public static <E> List<E> decorate(Class<E> elementClass) {
        return new ShrinkList<E>(elementClass);
    }

    public void shrink() {
        for (Iterator<E> i = super.iterator(); i.hasNext();)
            if (i.next() == null)
                i.remove();
    }

    @Override
    public Iterator<E> iterator() {
        shrink();
        return super.iterator();
    }

}

//public class BindingList<E extends Markable> extends ArrayList<E> {
//	Class cls;
//	public BindingList(Class operatingClass) {
//		cls = operatingClass;
//	}
//
//	public boolean addAll(Collection<? extends E> c) {
//		boolean res = super.addAll(c);
//		for (E e : this) {
//			e.setMarked(false);
//		}
//		return res;
//	}
//
//	public E get(int index) {
//		try {
//			E e = super.get(index);
//			e.setMarked(true);
//			return e;
//		} catch (IndexOutOfBoundsException e) {
//			try {
//				while (index >= size()) {
//					E o = (E) cls.newInstance();
//					o.setMarked(false);
//					add(o);
//				}
//				return super.get(index);
//			} catch (InstantiationException e1) {
//				e1.printStackTrace(); 
//			} catch (IllegalAccessException e1) {
//				e1.printStackTrace();
//			}
//		}
//		throw new RuntimeException("Shit happens.");
//	}
//
//	public void trimToSize() {
//		for (int i = size() - 1; i >= 0; i--) {
//			  E e = super.get(i);
//			if (!e.isMarked()) remove(i);
//		}
//		super.trimToSize();
//
//	}
//}