org.apache.lucene.index
Class FieldNormModifier

java.lang.Object
  org.apache.lucene.index.FieldNormModifier

public class FieldNormModifier
extends Object

Given a directory and a list of fields, updates the fieldNorms in place for every document. If Similarity class is specified, uses its computeNorm method to set norms. If -n command line argument is used, removed field norms, as if Field.Index.NO_NORMS was used.

NOTE: This will overwrite any length normalization or field/document boosts.

Constructor Summary

FieldNormModifier(Directory d, Similarity s)
Constructor for code that wishes to use this class programmatically If Similarity is null, kill the field norms.

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

FieldNormModifier

public FieldNormModifier(Directory d,
                         Similarity s)

Constructor for code that wishes to use this class programmatically If Similarity is null, kill the field norms.

Parameters:

d - the Directory to modify

s - the Similarity to use (can be null)

Method Detail

main

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

Command Line Execution method.

 Usage: FieldNormModifier /path/index <package.SimilarityClassName | -n> 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 (either using the Similarity given to this instance, or by using fake norms, and closes the IndexReader.

Parameters:

field - the field whose norms should be reset

Throws:

IOException