1 package org.apache.lucene.facet.search;
3 import org.apache.lucene.index.Term;
4 import org.apache.lucene.search.BooleanQuery;
5 import org.apache.lucene.search.Query;
6 import org.apache.lucene.search.TermQuery;
7 import org.apache.lucene.search.BooleanClause.Occur;
9 import org.apache.lucene.facet.index.params.CategoryListParams;
10 import org.apache.lucene.facet.index.params.FacetIndexingParams;
11 import org.apache.lucene.facet.search.params.FacetSearchParams;
12 import org.apache.lucene.facet.taxonomy.CategoryPath;
15 * Licensed to the Apache Software Foundation (ASF) under one or more
16 * contributor license agreements. See the NOTICE file distributed with
17 * this work for additional information regarding copyright ownership.
18 * The ASF licenses this file to You under the Apache License, Version 2.0
19 * (the "License"); you may not use this file except in compliance with
20 * the License. You may obtain a copy of the License at
22 * http://www.apache.org/licenses/LICENSE-2.0
24 * Unless required by applicable law or agreed to in writing, software
25 * distributed under the License is distributed on an "AS IS" BASIS,
26 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
27 * See the License for the specific language governing permissions and
28 * limitations under the License.
32 * Creation of drill down term or query.
34 * @lucene.experimental
36 public final class DrillDown {
39 * @see #term(FacetIndexingParams, CategoryPath)
41 public static final Term term(FacetSearchParams sParams, CategoryPath path) {
42 return term(sParams.getFacetIndexingParams(), path);
46 * Return a term for drilling down into a category.
48 public static final Term term(FacetIndexingParams iParams, CategoryPath path) {
49 CategoryListParams clp = iParams.getCategoryListParams(path);
50 char[] buffer = new char[path.charsNeededForFullPath()];
51 iParams.drillDownTermText(path, buffer);
52 return clp.getTerm().createTerm(String.valueOf(buffer));
56 * Return a query for drilling down into all given categories (AND).
57 * @see #term(FacetSearchParams, CategoryPath)
58 * @see #query(FacetSearchParams, Query, CategoryPath...)
60 public static final Query query(FacetIndexingParams iParams, CategoryPath... paths) {
61 if (paths==null || paths.length==0) {
62 throw new IllegalArgumentException("Empty category path not allowed for drill down query!");
64 if (paths.length==1) {
65 return new TermQuery(term(iParams, paths[0]));
67 BooleanQuery res = new BooleanQuery();
68 for (CategoryPath cp : paths) {
69 res.add(new TermQuery(term(iParams, cp)), Occur.MUST);
75 * Return a query for drilling down into all given categories (AND).
76 * @see #term(FacetSearchParams, CategoryPath)
77 * @see #query(FacetSearchParams, Query, CategoryPath...)
79 public static final Query query(FacetSearchParams sParams, CategoryPath... paths) {
80 return query(sParams.getFacetIndexingParams(), paths);
84 * Turn a base query into a drilling-down query for all given category paths (AND).
85 * @see #query(FacetIndexingParams, CategoryPath...)
87 public static final Query query(FacetIndexingParams iParams, Query baseQuery, CategoryPath... paths) {
88 BooleanQuery res = new BooleanQuery();
89 res.add(baseQuery, Occur.MUST);
90 res.add(query(iParams, paths), Occur.MUST);
95 * Turn a base query into a drilling-down query for all given category paths (AND).
96 * @see #query(FacetSearchParams, CategoryPath...)
98 public static final Query query(FacetSearchParams sParams, Query baseQuery, CategoryPath... paths) {
99 return query(sParams.getFacetIndexingParams(), baseQuery, paths);
103 * Turn a base query into a drilling-down query using the default {@link FacetSearchParams}
104 * @see #query(FacetSearchParams, Query, CategoryPath...)
106 public static final Query query(Query baseQuery, CategoryPath... paths) {
107 return query(new FacetSearchParams(), baseQuery, paths);