I tried to subclass PhraseScorer, but discovered that it's an abstract class
and its subclasses (ExactPhraseScorer and SloppyPhraseScorer) are final
classes. So instead, I extended Scorer with my custom scorer and extended
PhraseWeight (after making it public). My scorer's constructor is passed the
instance of PhraseScorer created by PhraseQuery.scorer(). My scorer's 'next'
and 'skipTo' methods call the PhraseScorer's methods first and if the result
is 'true', the payload is loaded and used to determine whether or not the
PhraseScorer's doc is a hit. If not, PhraseScorer.next() or skipTo() is
called again. In order to get the payload, I modified PhraseQuery to save
the TermPositions array it creates for its scorers and added a 'get' method.
The diff is included, below.
This is probably not the best solution, but at least a starting point for
further discussion.
Here's the diff:
Index: PhraseQuery.java
===================================================================
--- PhraseQuery.java (revision 551992)
+++ PhraseQuery.java (working copy)
@@ -36,7 +36,8 @@
private Vector terms = new Vector();
private Vector positions = new Vector();
private int slop = 0;
-
+ private TermPositions[] tps;
+
/** Constructs an empty phrase query. */
public PhraseQuery() {}
@@ -104,7 +105,7 @@
return result;
}
- private class PhraseWeight implements Weight {
+ public class PhraseWeight implements Weight {
private Similarity similarity;
private float value;
private float idf;
@@ -138,7 +139,7 @@
if (terms.size() == 0) // optimize zero-term case
return null;
- TermPositions[] tps = new TermPositions[terms.size()];
+ tps = new TermPositions[terms.size()];
for (int i = 0; i < terms.size(); i++) {
TermPositions p = reader.termPositions((Term)terms.elementAt(i));
if (p == null)
@@ -155,7 +156,9 @@
reader.norms(field));
}
-
+ public TermPositions[] getTermPositions() {
+ return tps;
+ }
public Explanation explain(IndexReader reader, int doc)
throws IOException {
On 6/27/07, Mark Miller <[EMAIL PROTECTED]> wrote:
You cannot do it because TermPositions is read in the
PhraseWeight.scorer(IndexReader) method (or MultiPhraseWeight) and
loaded into an array which is passed to PhraseScorer. Extend the Weight
as well and pass the payload to the Scorer as well is a possibility.
- Mark
Peter Keegan wrote:
> I'm looking at the new Payload api and would like to use it in the
> following
> manner. Meta-data is indexed as a special phrase (all terms at same
> position) and a payload is stored with the first term of each phrase. I
> would like to create a custom query class that extends PhraseQuery and
> uses
> its PhraseScorer to find matching documents. The custom query class then
> reads the payload from the first term of the matching query and uses
> it to
> produce a new score. However, I don't see how to get the payload from
the
> PhraseScorer's TermPositions. Is this possible?
>
>
> Peter
>
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