--- /dev/null
+package org.apache.lucene.facet.example.multiCL;
+
+import java.util.List;
+
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.search.IndexSearcher;
+import org.apache.lucene.search.Query;
+import org.apache.lucene.search.TermQuery;
+import org.apache.lucene.search.TopScoreDocCollector;
+import org.apache.lucene.store.Directory;
+
+import org.apache.lucene.search.MultiCollector;
+import org.apache.lucene.facet.example.ExampleUtils;
+import org.apache.lucene.facet.example.simple.SimpleUtils;
+import org.apache.lucene.facet.index.params.FacetIndexingParams;
+import org.apache.lucene.facet.search.FacetsCollector;
+import org.apache.lucene.facet.search.params.CountFacetRequest;
+import org.apache.lucene.facet.search.params.FacetSearchParams;
+import org.apache.lucene.facet.search.results.FacetResult;
+import org.apache.lucene.facet.taxonomy.CategoryPath;
+import org.apache.lucene.facet.taxonomy.TaxonomyReader;
+import org.apache.lucene.facet.taxonomy.directory.DirectoryTaxonomyReader;
+
+/**
+ * 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.
+ */
+
+/**
+ * MultiSearcher searches index with facets over an index with multiple
+ * category lists.
+ *
+ * @lucene.experimental
+ */
+public class MultiCLSearcher {
+
+ /**
+ * Search an index with facets.
+ *
+ * @param indexDir
+ * Directory of the search index.
+ * @param taxoDir
+ * Directory of the taxonomy index.
+ * @throws Exception
+ * on error (no detailed exception handling here for sample
+ * simplicity
+ * @return facet results
+ */
+ public static List<FacetResult> searchWithFacets(Directory indexDir,
+ Directory taxoDir, FacetIndexingParams iParams) throws Exception {
+
+ // prepare index reader and taxonomy.
+ IndexReader indexReader = IndexReader.open(indexDir);
+ TaxonomyReader taxo = new DirectoryTaxonomyReader(taxoDir);
+
+ // Get results
+ List<FacetResult> results = searchWithFacets(indexReader, taxo, iParams);
+
+ // we're done, close the index reader and the taxonomy.
+ indexReader.close();
+ taxo.close();
+ return results;
+ }
+
+ public static List<FacetResult> searchWithFacets(IndexReader indexReader,
+ TaxonomyReader taxo, FacetIndexingParams iParams) throws Exception {
+ // prepare searcher to search against
+ IndexSearcher searcher = new IndexSearcher(indexReader);
+
+ // faceted search is working in 2 steps:
+ // 1. collect matching documents
+ // 2. aggregate facets for collected documents and
+ // generate the requested faceted results from the aggregated facets
+
+ // step 1: create a query for finding matching documents for which we
+ // accumulate facets
+ Query q = new TermQuery(new Term(SimpleUtils.TEXT, "Quis"));
+ ExampleUtils.log("Query: " + q);
+
+ TopScoreDocCollector topDocsCollector = TopScoreDocCollector.create(10,
+ true);
+
+ // Faceted search parameters indicate which facets are we interested in
+ FacetSearchParams facetSearchParams = new FacetSearchParams(iParams);
+ facetSearchParams.addFacetRequest(new CountFacetRequest(
+ new CategoryPath("5"), 10));
+ facetSearchParams.addFacetRequest(new CountFacetRequest(
+ new CategoryPath("5", "5"), 10));
+ facetSearchParams.addFacetRequest(new CountFacetRequest(
+ new CategoryPath("6", "2"), 10));
+
+ // Facets collector is the simplest interface for faceted search.
+ // It provides faceted search functions that are sufficient to many
+ // application,
+ // although it is insufficient for tight control on faceted search
+ // behavior - in those
+ // situations other, more low-level interfaces are available, as
+ // demonstrated in other search examples.
+ FacetsCollector facetsCollector = new FacetsCollector(
+ facetSearchParams, indexReader, taxo);
+
+ // perform documents search and facets accumulation
+ searcher.search(q, MultiCollector.wrap(topDocsCollector, facetsCollector));
+
+ // Obtain facets results and print them
+ List<FacetResult> res = facetsCollector.getFacetResults();
+
+ int i = 0;
+ for (FacetResult facetResult : res) {
+ ExampleUtils.log("Res " + (i++) + ": " + facetResult);
+ }
+ return res;
+ }
+
+}