I'm searching for a java library that could help me to:

1. Alert me when a document into a collection is removed, added or modifed.

2. Convert any kind of documents (PDF, HTML, mails, XML, Microsoft Office
documents such as Word, etc.) in plain text format.

3. Index the plain text format in output

Can Greenstone do one or more of these tasks by using one of its libraries?

Thanks in advance for your help.

regards,

-- Marc