Adding (inverted index) algorithm to my WebCrawler written Java project and modifying some methods

I have a WebCrawler project files written in Java. My project requirements are listed below: Please read before you apply: ********************************* 1- I have a method in my project that calculate URLs waiting time inside frontier (I am using Priority Queue as frontier to store parsed URLs inside it). I am using (Maximum Waiting Time) for every URL, when a URL is reached this Max time it will dropping. I Need to calculate the position of dropped URL inside PriorityQueue. 2- I need to add some methods that stores (downloads) the crawled URLs (WebPages) on local disk. 3- Writing some class in (Java) to apply (Inverted-Indexing) on stored (downloaded) WebPages. NOTE: You will maybe need to add an extra classes (or import them to project) to clean HTML files (like: stemming, stopwords etc.) before applying (Inverted-Index) algorithm on downloaded WebPages. 4- You will store the indexed WebPages on database. I prefer using MySQL to do it. 5- Need a simple GUI for making search and show the results on screen for end-user. NOTE: ********* - Please DO NOT apply if you don't have idea about indexing or you did not worked on WebCrawler or indexing WebPages before. - The project in written in Java so any advice to change the project programming language will not be acceptable. - Thank you for you interesting Regards :)