org.apache.lucene.misc
Class LengthNormModifier

java.lang.Object
  org.apache.lucene.misc.LengthNormModifier

public class LengthNormModifier
extends Object

Given a directory, a Similarity, and a list of fields, updates the fieldNorms in place for every document using the Similarity.lengthNorm.

NOTE: This only works if you do not use field/document boosts in your index.

Version:

$Id$

Constructor Summary

LengthNormModifier(Directory d, Similarity s)
Constructor for code that wishes to use this class progaomatically.

Method Summary

static void	main(String[] args) Command Line Execution method.
void	reSetNorms(String field) Resets the norms for the specified field.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LengthNormModifier

public LengthNormModifier(Directory d,
                          Similarity s)

Constructor for code that wishes to use this class progaomatically.

Parameters:

d - The Directory to modify

s - The Similarity to use in reSetNorms

Method Detail

main

public static void main(String[] args)
                 throws IOException

Command Line Execution method.

 Usage: LengthNormModifier /path/index package.SimilarityClassName field1 field2 ...
 

Throws:

IOException

reSetNorms

public void reSetNorms(String field)
                throws IOException

Resets the norms for the specified field.

Opens a new IndexReader on the Directory given to this instance, modifies the norms using the Similarity given to this instance, and closes the IndexReader.

Parameters:

field - the field whose norms should be reset

Throws:

IOException