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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 David Berkman
 * 
 * This file is part of the SmallMind Code Project.
 * 
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 * 
 * 1) The terms of 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.
 * 
 * ...or...
 * 
 * 2) The terms of the Apache License, Version 2.0.
 * 
 * The SmallMind Code Project 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 or Apache License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 * 
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
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 */
package org.smallmind.persistence.cache.aop;

import java.io.Serializable;
import java.util.Iterator;
import org.smallmind.persistence.Durable;
import org.smallmind.persistence.UpdateMode;
import org.smallmind.persistence.cache.VectoredDao;

public class CacheCoherentIterable, D extends Durable> implements Iterable {

  private final Iterable durableIterable;
  private final VectoredDao vectoredDao;
  private final Class durableClass;

  public CacheCoherentIterable (Iterable durableIterable, Class durableClass, VectoredDao vectoredDao) {

    this.durableIterable = durableIterable;
    this.durableClass = durableClass;
    this.vectoredDao = vectoredDao;
  }

  @Override
  public Iterator iterator () {

    return new CacheCoherentIterator(durableIterable.iterator());
  }

  private class CacheCoherentIterator implements Iterator {

    private Iterator durableIter;

    public CacheCoherentIterator (Iterator durableIter) {

      this.durableIter = durableIter;
    }

    public boolean hasNext () {

      return durableIter.hasNext();
    }

    public D next () {

      return vectoredDao.persist(durableClass, durableIter.next(), UpdateMode.SOFT);
    }

    public void remove () {

      durableIter.remove();
    }
  }
}