IteratorListImpl.java

/*
    This file is part of Cyclos (www.cyclos.org).
    A project of the Social Trade Organisation (www.socialtrade.org).

    Cyclos 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 2 of the License, or
    (at your option) any later version.

    Cyclos 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 Cyclos; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */
package nl.strohalm.cyclos.utils;

import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;

import nl.strohalm.cyclos.utils.query.IteratorList;

/**
 * Basic implementation for iterator lists, using a delegate iterator
 * @author luis
 */
public class IteratorListImpl<E> implements IteratorList<E> {

    protected Iterator<E> iterator;
    private final boolean empty;

    public IteratorListImpl(final Iterator<E> iterator) {
        this.iterator = iterator;
        this.empty = !iterator.hasNext();
    }

    @Override
    public boolean add(final E o) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void add(final int index, final E element) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean addAll(final Collection<? extends E> c) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean addAll(final int index, final Collection<? extends E> c) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void clear() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean contains(final Object o) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean containsAll(final Collection<?> c) {
        throw new UnsupportedOperationException();
    }

    @Override
    public E get(final int index) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Iterator<E> getIterator() {
        return iterator;
    }

    @Override
    public boolean hasNext() {
        return iterator.hasNext();
    }

    @Override
    public int indexOf(final Object o) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean isEmpty() {
        return empty;
    }

    @Override
    public Iterator<E> iterator() {
        return this;
    }

    @Override
    public int lastIndexOf(final Object o) {
        throw new UnsupportedOperationException();
    }

    @Override
    public ListIterator<E> listIterator() {
        throw new UnsupportedOperationException();
    }

    @Override
    public ListIterator<E> listIterator(final int index) {
        throw new UnsupportedOperationException();
    }

    @Override
    public E next() {
        return iterator.next();
    }

    @Override
    public void remove() {
        throw new UnsupportedOperationException();
    }

    @Override
    public E remove(final int index) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean remove(final Object o) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean removeAll(final Collection<?> c) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean retainAll(final Collection<?> c) {
        throw new UnsupportedOperationException();
    }

    @Override
    public E set(final int index, final E element) {
        throw new UnsupportedOperationException();
    }

    @Override
    public int size() {
        throw new UnsupportedOperationException();
    }

    @Override
    public List<E> subList(final int fromIndex, final int toIndex) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Object[] toArray() {
        final List<E> list = new LinkedList<E>();
        for (final E e : this) {
            list.add(e);
        }
        return list.toArray();
    }

    @Override
    @SuppressWarnings("unchecked")
    public <T> T[] toArray(final T[] a) {
        final List<T> list = new LinkedList<T>();
        for (final E e : this) {
            list.add((T) e);
        }
        return list.toArray(a);
    }
}