/*
 * PatientView
 *
 * Copyright (c) Worth Solutions Limited 2004-2013
 *
 * This file is part of PatientView.
 *
 * PatientView 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 3 of the License,
 * or (at your option) any later version.
 * PatientView 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 PatientView in a file
 * titled COPYING. If not, see <http://www.gnu.org/licenses/>.
 *
 * @package PatientView
 * @link http://www.patientview.org
 * @author PatientView <info@patientview.org>
 * @copyright Copyright (c) 2004-2013, Worth Solutions Limited
 * @license http://www.gnu.org/licenses/gpl-3.0.html The GNU General Public License V3.0
 */

package org.patientview.batch;

import org.springframework.aop.support.AopUtils;
import org.springframework.batch.item.ItemReader;

import java.util.ArrayList;
import java.util.List;

/**
 *
 */
public class ListItemReader<T> implements ItemReader<T> {

    private List<T> list;

    public List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        if (AopUtils.isAopProxy(list)) {
            this.list = list;
        } else {
            this.list = new ArrayList<T>(list);
        }
    }

    @Override
    public T read() {

        if (list != null && !list.isEmpty()) {
            T remove = list.remove(0);
            while (remove == null && !list.isEmpty()) {
                remove = list.remove(0);
            }
            return remove;
        }
        return null;
    }
}