| /* |
| * 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.LinkedHashMap; |
| import java.util.Map; |
| |
| 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; |
| /** |
| * This feature allows to return a constant given value for the current document. |
| * |
| * Example configuration: |
| * <pre>{ |
| "name" : "userFromMobile", |
| "class" : "org.apache.solr.ltr.feature.ValueFeature", |
| "params" : { "value" : "${userFromMobile}", "required":true } |
| }</pre> |
| * |
| *You can place a constant value like "1.3f" in the value params, but many times you |
| *would want to pass in external information to use per request. For instance, maybe |
| *you want to rank things differently if the search came from a mobile device, or maybe |
| *you want to use your external query intent system as a feature. |
| *In the rerank request you can pass in rq={... efi.userFromMobile=1}, and the above |
| *feature will return 1 for all the docs for that request. If required is set to true, |
| *the request will return an error since you failed to pass in the efi, otherwise if will |
| *just skip the feature and use a default value of 0 instead. |
| **/ |
| public class ValueFeature extends Feature { |
| private float configValue = -1f; |
| private String configValueStr = null; |
| |
| private Object value = null; |
| private Boolean required = null; |
| |
| public Object getValue() { |
| return value; |
| } |
| |
| public void setValue(Object value) { |
| this.value = value; |
| if (value instanceof String) { |
| configValueStr = (String) value; |
| } else if (value instanceof Double) { |
| configValue = ((Double) value).floatValue(); |
| } else if (value instanceof Float) { |
| configValue = ((Float) value).floatValue(); |
| } else if (value instanceof Integer) { |
| configValue = ((Integer) value).floatValue(); |
| } else if (value instanceof Long) { |
| configValue = ((Long) value).floatValue(); |
| } else { |
| throw new FeatureException("Invalid type for 'value' in params for " + this); |
| } |
| } |
| |
| public boolean isRequired() { |
| return Boolean.TRUE.equals(required); |
| } |
| |
| public void setRequired(boolean required) { |
| this.required = required; |
| } |
| |
| @Override |
| public LinkedHashMap<String,Object> paramsToMap() { |
| final LinkedHashMap<String,Object> params = defaultParamsToMap(); |
| params.put("value", value); |
| if (required != null) { |
| params.put("required", required); |
| } |
| return params; |
| } |
| |
| @Override |
| protected void validate() throws FeatureException { |
| if (configValueStr != null && configValueStr.trim().isEmpty()) { |
| throw new FeatureException("Empty field 'value' in params for " + this); |
| } |
| } |
| |
| public ValueFeature(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 ValueFeatureWeight(searcher, request, originalQuery, efi); |
| } |
| |
| public class ValueFeatureWeight extends FeatureWeight { |
| |
| final protected Float featureValue; |
| |
| public ValueFeatureWeight(IndexSearcher searcher, |
| SolrQueryRequest request, Query originalQuery, Map<String,String[]> efi) { |
| super(ValueFeature.this, searcher, request, originalQuery, efi); |
| if (configValueStr != null) { |
| final String expandedValue = macroExpander.expand(configValueStr); |
| if (expandedValue != null) { |
| featureValue = Float.parseFloat(expandedValue); |
| } else if (isRequired()) { |
| throw new FeatureException(this.getClass().getSimpleName() + " requires efi parameter that was not passed in request."); |
| } else { |
| featureValue=null; |
| } |
| } else { |
| featureValue = configValue; |
| } |
| } |
| |
| @Override |
| public FeatureScorer scorer(LeafReaderContext context) throws IOException { |
| if(featureValue!=null) { |
| return new ValueFeatureScorer(this, featureValue, |
| DocIdSetIterator.all(DocIdSetIterator.NO_MORE_DOCS)); |
| } else { |
| return null; |
| } |
| } |
| |
| |
| } |
| |
| } |