This is a patch I made to be able to boost the terms with a specific factor
beside the relevancy returned by MoreLikeThis. This is helpful when having
more then 1 MoreLikeThis in the query, so words in the field A (i.e. Title)
can be boosted more than words in the field B (i.e. Description).
Any feedback?
Jonathan
Index:
/home/developer/workspace/lucene/contrib/queries/src/java/org/apache/lucene/search/similar/MoreLikeThis.java
===================================================================
---
/home/developer/workspace/lucene/contrib/queries/src/java/org/apache/lucene/search/similar/MoreLikeThis.java
(revision 651048)
+++
/home/developer/workspace/lucene/contrib/queries/src/java/org/apache/lucene/search/similar/MoreLikeThis.java
(working copy)
@@ -284,6 +284,11 @@
private final IndexReader ir;
/**
+ * Boost factor to use when boosting the terms
+ */
+ private int boostFactor = 1;
+
+ /**
* Constructor requiring an IndexReader.
*/
public MoreLikeThis(IndexReader ir) {
@@ -574,7 +579,7 @@
}
float myScore = ((Float) ar[2]).floatValue();
- tq.setBoost(myScore / bestScore);
+ tq.setBoost(boostFactor * myScore / bestScore);
}
try {
@@ -921,6 +926,22 @@
x = 1;
}
}
+
+ /**
+ * Returns the boost factor used when boosting terms
+ * @return the boost factor used when boosting terms
+ */
+ public int getBoostFactor() {
+ return boostFactor;
+ }
+
+ /**
+ * Sets the boost factor to use when boosting terms
+ * @param boostFactor
+ */
+ public void setBoostFactor(int boostFactor) {
+ this.boostFactor = boostFactor;
+ }
}
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