/*
 * ToroDB
 * Copyright © 2014 8Kdata Technology (www.8kdata.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.torodb.core.cursors;

import com.google.common.base.Preconditions;

import java.util.Iterator;
import java.util.List;

public class BatchCursor<E> implements AutoCloseable, Iterator<List<E>> {

  private final Cursor<E> cursor;
  private final int size;

  public BatchCursor(Cursor<E> cursor, int size) {
    super();

    Preconditions.checkArgument(size > 0);

    this.cursor = cursor;
    this.size = size;
  }

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

  @Override
  public List<E> next() {
    return cursor.getNextBatch(size);
  }

  @Override
  public void close() throws Exception {
    cursor.close();
  }
}