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The Berkeley parser analyzes the grammatical structure of natural language using probabilistic context-free grammars (PCFGs).

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package edu.berkeley.nlp.util;

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

/**
 * Created by IntelliJ IDEA.
 * User: aria42
 * Date: Nov 15, 2008
 */
public class Iterables {
  public static  Iterable> zip(final Iterable s, final Iterable t) {
    return new Iterable>() {
      public Iterator> iterator() {
        return Iterators.zip(s.iterator(),t.iterator());
      }
    };
  }

  public static  Iterable concat(final Iterable...iterables) {
    return new ConcatenationIterable(iterables);
  }

  public static  int size(Iterable iterable) {
    if (Collection.class.isInstance(iterable)) {
      return ((Collection) iterable).size();
    }
    int count = 0;
    for (T t : iterable) {
      count++;
    }
    return count;
  }

  public static  List fillList(Iterable iterable) {
    return Iterators.fillList(iterable.iterator());
  }

  public static  boolean isEmpty(Iterable iterable) {
    return Iterables.size(iterable) == 0;
  }
}