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Data structures and related utilities used in LensKit.
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/*
 * LensKit, an open source recommender systems toolkit.
 * Copyright 2010-2014 LensKit Contributors.  See CONTRIBUTORS.md.
 * Work on LensKit has been funded by the National Science Foundation under
 * grants IIS 05-34939, 08-08692, 08-12148, and 10-17697.
 *
 * This program 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 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, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package org.grouplens.lenskit.collections;

import it.unimi.dsi.fastutil.objects.ObjectCollection;
import it.unimi.dsi.fastutil.objects.ObjectIterator;
import it.unimi.dsi.fastutil.objects.ObjectIterators;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;
import java.util.Set;

/**
 * An object collection wrapper for a collection.
 *
 * @author GroupLens Research
 */
class ObjectCollectionWrapper implements ObjectCollection, Serializable {
    private static final long serialVersionUID = 1L;

    private Collection delegate;

    public ObjectCollectionWrapper(Collection objects) {
        delegate = objects;
    }

    @Override
    public ObjectIterator iterator() {
        return ObjectIterators.asObjectIterator(delegate.iterator());
    }

    @Override @Deprecated
    public ObjectIterator objectIterator() {
        return iterator();
    }

    @Override
    public  T[] toArray(T[] a) {
        if (size() <= a.length) {
            ObjectIterators.unwrap(iterator(), a);
            return a;
        } else {
            return delegate.toArray(a);
        }
    }

    @Override
    public int size() {
        return delegate.size();
    }

    @Override
    public boolean isEmpty() {
        return delegate.isEmpty();
    }

    @Override
    public boolean contains(Object o) {
        return delegate.contains(o);
    }

    @Override
    public Object[] toArray() {
        return delegate.toArray();
    }

    @Override
    public boolean add(E e) {
        return delegate.add(e);
    }

    @Override
    public boolean remove(Object o) {
        return delegate.remove(o);
    }

    @Override
    public boolean containsAll(Collection c) {
        return delegate.containsAll(c);
    }

    @Override
    public boolean addAll(Collection c) {
        return delegate.addAll(c);
    }

    @Override
    public boolean removeAll(Collection c) {
        return delegate.removeAll(c);
    }

    @Override
    public boolean retainAll(Collection c) {
        return delegate.retainAll(c);
    }

    @Override
    public void clear() {
        delegate.clear();
    }

    @Override
    public String toString() {
        return delegate.toString();
    }
}