public void findDocumentFrequency(){

		for(String uniqueToken : tokenList){
			for(Text t : textList){
				if(t.getTokens().contains(uniqueToken)){
					if(!documentFrequency.containsKey(uniqueToken)){
						documentFrequency.put(uniqueToken, 0);
					}
					documentFrequency.put(uniqueToken, documentFrequency.get(uniqueToken)+1);
				}
			}
		}
	}