be configured using the yacy.init file. The boost information is taken from the configuration each time when a query to solr is done.pull/1/head
Michael Peter Christen
12 years ago
parent
ea033f8f8e
commit
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/**
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* Boost
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* Copyright 2012 by Michael Peter Christen
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* First released 30.11.2012 at http://yacy.net
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.cora.federate.solr;
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import java.util.LinkedHashMap;
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import net.yacy.cora.util.CommonPattern;
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/**
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* The Boost class is the solr ranking definition file. It contains boost values in a Linked HashMap; the 'linked'-Version is used
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* to maintain the order of the arguments which shall be stable according to the iteration order within a configuration servlet.
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* Because the order is influence by a double-check mechanismn the attributes to apply a document signature are also integrated
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* into this class.
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*/
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public class Boost extends LinkedHashMap<YaCySchema, Float> {
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private static final long serialVersionUID = 5248172257724571603L;
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public final static Boost RANKING = new Boost();
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// for minTokenLen = 2 the quantRate value should not be below 0.24; for minTokenLen = 3 the quantRate value must be not below 0.5!
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private float quantRate = 0.5f; // to be filled with search.ranking.solr.doubledetection.quantrate
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private int minTokenLen = 3; // to be filled with search.ranking.solr.doubledetection.minlength
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private Boost() {
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super();
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put(YaCySchema.sku, 20.0f);
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put(YaCySchema.url_paths_sxt, 20.0f);
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put(YaCySchema.title, 15.0f);
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put(YaCySchema.h1_txt, 11.0f);
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put(YaCySchema.h2_txt, 10.0f);
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put(YaCySchema.author, 8.0f);
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put(YaCySchema.description, 5.0f);
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put(YaCySchema.keywords, 2.0f);
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put(YaCySchema.text_t, 1.0f);
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put(YaCySchema.fuzzy_signature_unique_b, 100000.0f); // must be very high to move double results to end of list
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}
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/**
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* override the get method to return 1.0f for each non-resolvable object
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*/
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public Float get(Object field) {
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Float boost = super.get(field);
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if (boost == null) return 1.0f;
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return boost;
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}
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/**
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* the updateDef is a definition string that comes from a configuration file.
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* It should be a comma-separated list of field^boost values
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* This should be called with the field in search.ranking.solr.boost
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* @param boostDef the definition string
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*/
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public void update(String boostDef) {
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// call i.e. with "sku^20.0f,url_paths_sxt^20.0f,title^15.0f,h1_txt^11.0f,h2_txt^10.0f,author^8.0f,description^5.0f,keywords^2.0f,text_t^1.0f,fuzzy_signature_unique_b^100000.0f"
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if (boostDef == null || boostDef.length() == 0) return;
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String[] bf = CommonPattern.COMMA.split(boostDef);
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for (String boost: bf) {
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int p = boost.indexOf('^');
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if (p < 0) continue;
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YaCySchema field = YaCySchema.valueOf(boost.substring(0, p));
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Float factor = Float.parseFloat(boost.substring(p + 1));
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this.put(field, factor);
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}
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}
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public void setQuantRate(float quantRate) {
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this.quantRate = quantRate;
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}
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public void setMinTokenLen(int minTokenLen) {
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this.minTokenLen = minTokenLen;
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}
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public float getQuantRate() {
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return quantRate;
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}
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public int getMinTokenLen() {
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return minTokenLen;
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}
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}
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