| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.solr.ltr.feature; |
| |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.lucene.document.Document; |
| import org.apache.lucene.index.IndexableField; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.search.DocIdSetIterator; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.Query; |
| import org.apache.solr.request.SolrQueryRequest; |
| import org.apache.solr.schema.BoolField; |
| |
| /** |
| * This feature returns the value of a field in the current document |
| * Example configuration: |
| * <pre>{ |
| "name": "rawHits", |
| "class": "org.apache.solr.ltr.feature.FieldValueFeature", |
| "params": { |
| "field": "hits" |
| } |
| }</pre> |
| */ |
| public class FieldValueFeature extends Feature { |
| |
| private String field; |
| private Set<String> fieldAsSet; |
| |
| public String getField() { |
| return field; |
| } |
| |
| public void setField(String field) { |
| this.field = field; |
| fieldAsSet = Collections.singleton(field); |
| } |
| |
| @Override |
| public LinkedHashMap<String,Object> paramsToMap() { |
| final LinkedHashMap<String,Object> params = defaultParamsToMap(); |
| params.put("field", field); |
| return params; |
| } |
| |
| @Override |
| protected void validate() throws FeatureException { |
| if (field == null || field.isEmpty()) { |
| throw new FeatureException(getClass().getSimpleName()+ |
| ": field must be provided"); |
| } |
| } |
| |
| public FieldValueFeature(String name, Map<String,Object> params) { |
| super(name, params); |
| } |
| |
| @Override |
| public FeatureWeight createWeight(IndexSearcher searcher, boolean needsScores, |
| SolrQueryRequest request, Query originalQuery, Map<String,String[]> efi) |
| throws IOException { |
| return new FieldValueFeatureWeight(searcher, request, originalQuery, efi); |
| } |
| |
| public class FieldValueFeatureWeight extends FeatureWeight { |
| |
| public FieldValueFeatureWeight(IndexSearcher searcher, |
| SolrQueryRequest request, Query originalQuery, Map<String,String[]> efi) { |
| super(FieldValueFeature.this, searcher, request, originalQuery, efi); |
| } |
| |
| @Override |
| public FeatureScorer scorer(LeafReaderContext context) throws IOException { |
| return new FieldValueFeatureScorer(this, context, |
| DocIdSetIterator.all(DocIdSetIterator.NO_MORE_DOCS)); |
| } |
| |
| public class FieldValueFeatureScorer extends FeatureScorer { |
| |
| LeafReaderContext context = null; |
| |
| public FieldValueFeatureScorer(FeatureWeight weight, |
| LeafReaderContext context, DocIdSetIterator itr) { |
| super(weight, itr); |
| this.context = context; |
| } |
| |
| @Override |
| public float score() throws IOException { |
| |
| try { |
| final Document document = context.reader().document(itr.docID(), |
| fieldAsSet); |
| final IndexableField indexableField = document.getField(field); |
| if (indexableField == null) { |
| return getDefaultValue(); |
| } |
| final Number number = indexableField.numericValue(); |
| if (number != null) { |
| return number.floatValue(); |
| } else { |
| final String string = indexableField.stringValue(); |
| if (string.length() == 1) { |
| // boolean values in the index are encoded with the |
| // a single char contained in TRUE_TOKEN or FALSE_TOKEN |
| // (see BoolField) |
| if (string.charAt(0) == BoolField.TRUE_TOKEN[0]) { |
| return 1; |
| } |
| if (string.charAt(0) == BoolField.FALSE_TOKEN[0]) { |
| return 0; |
| } |
| } |
| } |
| } catch (final IOException e) { |
| throw new FeatureException( |
| e.toString() + ": " + |
| "Unable to extract feature for " |
| + name, e); |
| } |
| return getDefaultValue(); |
| } |
| |
| @Override |
| public float getMaxScore(int upTo) throws IOException { |
| return Float.POSITIVE_INFINITY; |
| } |
| } |
| } |
| } |