net.sf.staccatocommons.collections.internal.iterator.ConcatIterator Maven / Gradle / Ivy

Go to download
/**
 *  Copyright (c) 2010-2012, The StaccatoCommons Team
 *
 *  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; version 3 of the License.
 *
 *  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 Lesser General Public License for more details.
 */

/*
 Copyright (c) 2012, The Staccato-Commons Team

 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; version 3 of the License.

 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 Lesser General Public License for more details.
 */
package net.sf.staccatocommons.collections.internal.iterator;

import java.util.Iterator;
import java.util.NoSuchElementException;

import net.sf.staccatocommons.defs.Thunk;
import net.sf.staccatocommons.iterators.thriter.AdvanceThriterator;
import net.sf.staccatocommons.iterators.thriter.Thriter;
import net.sf.staccatocommons.iterators.thriter.Thriterators;

/**
 * @author flbulgarelli
 * 
 * @param 
 */
public final class ConcatIterator extends AdvanceThriterator {

  private Thriter iter;
  private Thriter other;
  private boolean second = false;

  /**
   * Creates a new {@link ConcatIterator}
   */
  public ConcatIterator(Thriter iter, Iterator other) {
    this.iter = iter;
    this.other = Thriterators.from(other);
  }

  public boolean hasNext() {
    if (iter.hasNext())
      return true;

    if (second)
      return false;

    iter = other;
    second = true;
    return iter.hasNext();
  }

  public void advanceNext() throws NoSuchElementException {
    iter.advanceNext();
  }

  public A current() throws NoSuchElementException {
    return iter.current();
  }

  @Override
  public Thunk delayedCurrent() {
    return iter.delayedCurrent();
  }
}