import java.util.AbstractList;
import java.util.List;
import java.util.Objects;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CloseableList<E extends AutoCloseable> extends AbstractList<E> implements AutoCloseable {
	public static final Logger LOGGER = LoggerFactory.getLogger(CloseableList.class);
	private final List<E> closableList;

	/**
	 * Create list with closable objects.
	 *
	 * @param closableList
	 *            list of tensor, must not be null
	 */
	public CloseableList(List<E> closableList) {
		Objects.requireNonNull(closableList);
		this.closableList = closableList;
	}

	@Override
	public E get(int index) {
		return closableList.get(index);
	}

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

	@Override
	public void close() {
		for (E item : closableList) {
			try {
				item.close();
			} catch (Exception e) {
				LOGGER.warn("Cannot close item in list", e);
			}
		}
	}
}