You cannot override static methods - this is how Java works. You can
override any of the non-static (and non-final) methods.
Erik
On Dec 17, 2004, at 1:02 PM, Dan Climan wrote:
Thanks for pointing out the error in my originally proposed solution
to the
question of overriding encodeNorm and decodeNorm, but am I correct that
there's an issue?
Is it possible to override the encodeNorm and decode Norm using the
public
API?
My strategy has been as follows:
a) define a custom encodeNorm and decodeNorm (see below)
b) Every time I get a new IndexWriter or IndexSearcher, I immediately
call
setSimilarity. For Example:
IndexWriter iw = new IndexWriter(dir, aAnalyzer, overwriteIndex);
iw.setSimilarity(new MySimilarity());
OR
searcher = new IndexSearcher(reader);
searcher.setSimilarity(new MySimilarity());
I define MySimilarity as follows:
public class MySimilarity extends DefaultSimilarity {
public MySimilarity() {
super();
}
public static byte encodeNorm(float f) {
int insertion = Math.abs(Arrays.binarySearch(kmNorms, f));
if (insertion >= 256)
insertion = 255;
byte b = (byte) (insertion - 128);
return b;
}
public static float decodeNorm(byte b) {
return MYNORMS[(int)b + 128];
}
public float lengthNorm(String fieldName, int numTerms) {
return 1.0f;
}
//Note this is an array of 256 values in sorted order
public static final float[] MYNORMS = {
0.0000E+00f,
1.0000E-10f,
1.0000E-09f,
.
.
.
1.0000E+04f,
1.0000E+05f
};
}
I would have expected that once setSimilarity is called for an
IndexWriter
or IndexSearcher that all use of a Similarity method would come from
the
Similarity that was set. Since the classes I mentioned previously all
have
constructions such as "Similarity.decodeNorm(f)". They do not appear to
behave this way.
Do you agree that IndexWriter and IndexSearcher should behave as I
suggest
with regard to setSimilarity?
Is there another way to accomplish a change in the
encodeNorm/decodeNorm
using the existing API? If not, should I try to generate a patch to the
classes that use this construction to force them to use the simliarity
set
by setSimilarity?
Dan
-----Original Message-----
From: Doug Cutting [mailto:[EMAIL PROTECTED]
Sent: Thursday, December 16, 2004 9:28 PM
To: Lucene Developers List
Subject: Re: Explanations and overridden similarity
Dan Climan wrote:
Shouldn't the call to Similarity.decodeNorm be replaced with a call to
Similarity.getDefault().decodeNorm
decodeNorm is a static method.
Doug
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