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/*
* 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.jackrabbit.oak.plugins.index.lucene.util;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.jackrabbit.oak.plugins.index.lucene.FieldNames;
import org.apache.jackrabbit.oak.query.QueryImpl;
import org.apache.jackrabbit.oak.spi.query.QueryIndex;
import org.apache.jackrabbit.oak.spi.state.NodeBuilder;
import org.apache.lucene.facet.Facets;
import org.apache.lucene.facet.FacetsCollector;
import org.apache.lucene.facet.FacetsConfig;
import org.apache.lucene.facet.MultiFacets;
import org.apache.lucene.facet.sortedset.DefaultSortedSetDocValuesReaderState;
import org.apache.lucene.facet.sortedset.SortedSetDocValuesFacetCounts;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TopDocs;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
*/
public class FacetHelper {
private static final Logger LOGGER = LoggerFactory.getLogger(FacetHelper.class);
/**
* IndexPaln Attribute name which refers to the name of the fields that should be used for facets.
*/
public static final String ATTR_FACET_FIELDS = "oak.facet.fields";
public static FacetsConfig getFacetsConfig(NodeBuilder definition) {
return new NodeStateFacetsConfig(definition);
}
public static Facets getFacets(IndexSearcher searcher, Query query, TopDocs docs, QueryIndex.IndexPlan plan, boolean secure) throws IOException {
Facets facets = null;
@SuppressWarnings("unchecked")
List<String> facetFields = (List<String>) plan.getAttribute(ATTR_FACET_FIELDS);
if (facetFields != null && facetFields.size() > 0) {
Map<String, Facets> facetsMap = new HashMap<String, Facets>();
for (String facetField : facetFields) {
FacetsCollector facetsCollector = new FacetsCollector();
try {
DefaultSortedSetDocValuesReaderState state = new DefaultSortedSetDocValuesReaderState(
searcher.getIndexReader(), FieldNames.createFacetFieldName(facetField));
FacetsCollector.search(searcher, query, 10, facetsCollector);
facetsMap.put(facetField, secure ?
new FilteredSortedSetDocValuesFacetCounts(state, facetsCollector, plan.getFilter(), docs) :
new SortedSetDocValuesFacetCounts(state, facetsCollector));
} catch (IllegalArgumentException iae) {
LOGGER.warn("facets for {} not yet indexed", facetField);
}
}
if (facetsMap.size() > 0) {
facets = new MultiFacets(facetsMap);
}
}
return facets;
}
public static String parseFacetField(String columnName) {
return columnName.substring(QueryImpl.REP_FACET.length() + 1, columnName.length() - 1);
}
}