gistfile1.java

	private List<String> itemsWithAllTokens(String phrase, Map<String, List<String>> map) {
		List<String> tokens = tokenize(phrase);
		List<String> items = map.get(tokens.get(0));
		if (items == null) {
            return new ArrayList<String>();
        }
		for (int i=1; i<tokens.size(); i++) {
			List<String> tempListings = map.get(tokens.get(i));
			if (tempListings == null) return new ArrayList<String>();	//As soon as we have a token with nothing in it, we can return an empty list...
			List<String> toDelete = new ArrayList<String>();
			for (int j=0; j<items.size(); j++) {
				String l = items.get(j);
				if (!tempListings.contains(l)) toDelete.add(l);
			}
			items.removeAll(toDelete);
		}
		return items;
	}