LengthNormSimilarity.java

/*
 * Copyright (c) 2009 Andrejs Jermakovics.
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Andrejs Jermakovics - initial implementation
 */
package it.unibz.instasearch.indexing;


import org.apache.lucene.search.DefaultSimilarity;

/**
 * 
 */
public class LengthNormSimilarity extends DefaultSimilarity
{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	
//	public float lengthNorm(String fieldName, int numTerms)
//	{
//		
//		if( fieldName.equals(Field.CONTENTS.toString()) )
//			return 1.0f; // don't decrease relevance for long documents 
//		else
//			return super.lengthNorm(fieldName, numTerms);
//		
//		//Alternative - Sweetspot similarity:
//		//	1/sqrt( steepness * (abs(numTerms-min) + abs(numTerms-max) - (max-min)) + 1 ) .
//		//	      - steepnes = 0.5, for [min, max] term docs returns 1
//	}
	
	
}