You have to look at Analyzers a bit here because that's what controls what is in the index. The simplest case is a WhitespaceAnalyzer that breaks the input stream up into tokens on any whitespace.
So, in your example and using a WhitespaceAnalyzer, you'd get the following tokens: lucene, is, used, to, index, files Let's put these into a field called "text" in a document. A document is a little like a row in a database table. So you could have fields "text", "filename".... In this example, "filename" has nothing (and, in fact, doesn't even need to be present in this particular doc). Now, parsing the query against the text field (see the query syntax) essentially asks "does the document have the word 'index' OR the word 'files' in the 'text' field"? (OR is the default operator). But note that there's no magic involved here. Lucene, for instance, doesn't know about indexing files. The examples in the book have underlying code that opens the files, reads the data and feeds that data through an Analyzer for indexing. That's code you have to write yourself. Anyway, I'd examine the examples carefully. Also, get a copy of Luke, a program that allows you to examine the index and see what various query parsers do. It's invaluable. As far as the internal structure of the index, I just treat it as a black box, but on the Wiki there are links to various explanations. Best Erick On Thu, Feb 19, 2009 at 6:17 AM, Seid Mohammed <seidy...@gmail.com> wrote: > I am new to lucene, and reading lucene in action book > sometimes, i better understand when somone tell me an answer than a book. > my queston is > when indexing, what actually lucene is doing? > if i have a file called test.txt with contents " lucen is used to > index files" and i apply lucene indexing, what is the content of the > index and what is the structure of the index?. > > and if i apply lucene search, for example a query "index files", from > where lucene searches, from the index or from the test.index file > > thanks a lot > seid m > > -- > "RABI ZIDNI ILMA" > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > >
