14 apr 2006 kl. 18.31 skrev Doug Cutting:
karl wettin wrote:
I would like to store all in my application rather than using the
Lucene persistency mechanism for tokens. I only want the search
mechanism. I do not need the IndexReader and IndexWriter as that
will be a natural part of my application. I only want to use the
Searchable.
Implement the IndexReader API, overriding all of the abstract
methods. That will enable you to search your index using Lucene's
search code.
This was not even half as tough I thought it would be. I'm however
not certain about a couple of methods:
1. TermPositions. It returns the next position of *what* in the
document? It would make sence to me if it returned a start/end
offset, but this just confuses me.
implements TermPositions {
/** Returns next position in the current document. It is an
error to call
this more than [EMAIL PROTECTED] #freq()} times
without calling [EMAIL PROTECTED] #next()}<p> This is
invalid until [EMAIL PROTECTED] #next()} is called for
the first time.
*/
public int nextPosition() throws IOException {
return 0; // todo
}
2. Norms. I've been looking in other code, but I honestly don't
understand what data they are storing, thus it's really hard for me
to implement :-) I read it as it contains the boost of each document
per field? So what does the byte represent then?
/** Returns the byte-encoded normalization factor for the
named field of
* every document. This is used by the search code to score
documents.
* @see org.apache.lucene.document.Field#setBoost(float)
*/
public byte[] norms(String field) {
return null; // todo
}
/** Reads the byte-encoded normalization factor for the
named field of every
* document. This is used by the search code to score
documents.
* @see org.apache.lucene.document.Field#setBoost(float)
*/
public void norms(String field, byte[] bytes, int offset)
throws IOException {
// todo
}
/** Implements setNorm in subclass.*/
protected void doSetNorm(int doc, String field, byte value)
throws IOException {
// todo
}
3. I presume I can just ignore the following methods:
/** Implements deletion of the document numbered
<code>docNum</code>.
* Applications should call [EMAIL PROTECTED] #delete(int)} or [EMAIL PROTECTED]
#delete(org.apache.lucene.index.Term)}.
*/
protected void doDelete(int docNum) {
}
/** Implements actual undeleteAll() in subclass. */
protected void doUndeleteAll() {
}
/** Implements commit. */
protected void doCommit() {
}
/** Implements close. */
protected void doClose() {
}
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