| /* |
| * 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.spelling.suggest; |
| |
| import java.text.ParseException; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.lucene.expressions.Expression; |
| import org.apache.lucene.expressions.SimpleBindings; |
| import org.apache.lucene.expressions.js.JavascriptCompiler; |
| import org.apache.lucene.search.DoubleValuesSource; |
| import org.apache.lucene.search.LongValuesSource; |
| import org.apache.lucene.search.SortField; |
| import org.apache.lucene.search.spell.Dictionary; |
| import org.apache.lucene.search.suggest.DocumentValueSourceDictionary; |
| import org.apache.solr.core.SolrCore; |
| import org.apache.solr.search.SolrIndexSearcher; |
| |
| /** |
| * Factory for {@link org.apache.lucene.search.suggest.DocumentValueSourceDictionary} |
| */ |
| public class DocumentExpressionDictionaryFactory extends DictionaryFactory { |
| |
| /** Label for defining field to use for terms */ |
| public static final String FIELD = "field"; |
| |
| /** Label for defining payloadField to use for terms (optional) */ |
| public static final String PAYLOAD_FIELD = "payloadField"; |
| |
| /** Label for defining expression to evaluate the weight for the terms */ |
| public static final String WEIGHT_EXPRESSION = "weightExpression"; |
| |
| /** Label used to define the name of the |
| * sortField used in the {@link #WEIGHT_EXPRESSION} */ |
| public static final String SORT_FIELD = "sortField"; |
| |
| @Override |
| public Dictionary create(SolrCore core, SolrIndexSearcher searcher) { |
| if(params == null) { |
| // should not happen; implies setParams was not called |
| throw new IllegalStateException("Value of params not set"); |
| } |
| |
| String field = (String) params.get(FIELD); |
| String payloadField = (String) params.get(PAYLOAD_FIELD); |
| String weightExpression = (String) params.get(WEIGHT_EXPRESSION); |
| Set<SortField> sortFields = new HashSet<>(); |
| |
| if (field == null) { |
| throw new IllegalArgumentException(FIELD + " is a mandatory parameter"); |
| } |
| |
| if (weightExpression == null) { |
| throw new IllegalArgumentException(WEIGHT_EXPRESSION + " is a mandatory parameter"); |
| } |
| |
| for(int i = 0; i < params.size(); i++) { |
| if (params.getName(i).equals(SORT_FIELD)) { |
| String sortFieldName = (String) params.getVal(i); |
| |
| sortFields.add(getSortField(core, sortFieldName)); |
| } |
| } |
| |
| return new DocumentValueSourceDictionary(searcher.getIndexReader(), field, fromExpression(weightExpression, |
| sortFields), payloadField); |
| } |
| |
| public LongValuesSource fromExpression(String weightExpression, Set<SortField> sortFields) { |
| Expression expression = null; |
| try { |
| expression = JavascriptCompiler.compile(weightExpression); |
| } catch (ParseException e) { |
| throw new RuntimeException(e); |
| } |
| SimpleBindings bindings = new SimpleBindings(); |
| for (SortField sortField : sortFields) { |
| bindings.add(sortField.getField(), fromSortField(sortField)); |
| } |
| return expression.getDoubleValuesSource(bindings).toLongValuesSource(); |
| } |
| |
| private DoubleValuesSource fromSortField(SortField field) { |
| switch(field.getType()) { |
| case INT: |
| return DoubleValuesSource.fromIntField(field.getField()); |
| case LONG: |
| return DoubleValuesSource.fromLongField(field.getField()); |
| case FLOAT: |
| return DoubleValuesSource.fromFloatField(field.getField()); |
| case DOUBLE: |
| return DoubleValuesSource.fromDoubleField(field.getField()); |
| case SCORE: |
| return DoubleValuesSource.SCORES; |
| default: |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| private SortField getSortField(SolrCore core, String sortFieldName) { |
| return core.getLatestSchema().getField(sortFieldName).getSortField(true); |
| } |
| |
| } |