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Stanford CoreNLP provides a set of natural language analysis tools which can take raw English language text input and give the base forms of words, their parts of speech, whether they are names of companies, people, etc., normalize dates, times, and numeric quantities, mark up the structure of sentences in terms of phrases and word dependencies, and indicate which noun phrases refer to the same entities. It provides the foundational building blocks for higher level text understanding applications.

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package edu.stanford.nlp.util;

import java.util.*;
import java.util.stream.Stream;

/**
 * This cures a pet peeve of mine: that you can't use an Iterator directly in
 * Java 5's foreach construct.  Well, this one you can, dammit.
 *
 * @author Bill MacCartney
 */
public class IterableIterator implements Iterator, Iterable {

  private Iterator it;
  private Iterable iterable;
  private Stream stream;

  public IterableIterator(Iterator it) {
    this.it = it;
  }

  public IterableIterator(Iterable iterable) {
    this.iterable = iterable;
    this.it = iterable.iterator();
  }

  public IterableIterator(Stream stream) {
    this.stream = stream;
    this.it = stream.iterator();
  }

  public boolean hasNext() { return it.hasNext(); }
  public E next() { return it.next(); }
  public void remove() { it.remove(); }
  
  public Iterator iterator() {
    if (iterable != null) {
      return iterable.iterator();
    } else if (stream != null) {
      return stream.iterator();
    } else {
      return this;
    }
  }

  @Override
  public Spliterator spliterator() {
    if (iterable != null) {
      return iterable.spliterator();
    } else if (stream != null) {
      return stream.spliterator();
    } else {
      return Spliterators.spliteratorUnknownSize(it, Spliterator.ORDERED | Spliterator.CONCURRENT);
    }
  }
}