| /* |
| * 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; |
| |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.jackrabbit.oak.spi.query.Filter; |
| import org.apache.jackrabbit.oak.spi.state.NodeState; |
| |
| /** |
| * A LuceneIndexProvider that return a LuceneIndex with a really low cost, so |
| * that it tries to guarantee its usage in the queries |
| * |
| */ |
| public class LowCostLuceneIndexProvider extends LuceneIndexProvider { |
| |
| @Override |
| protected LuceneIndex newLuceneIndex() { |
| return new LowCostLuceneIndex(tracker, aggregator); |
| } |
| |
| private static class LowCostLuceneIndex extends LuceneIndex { |
| public LowCostLuceneIndex(IndexTracker tracker, NodeAggregator aggregator) { |
| super(tracker, aggregator); |
| } |
| |
| @Override |
| public double getMinimumCost() { |
| return 1e-3; |
| } |
| |
| @Override |
| public List<IndexPlan> getPlans(Filter filter, List<OrderEntry> sortOrder, NodeState rootState) { |
| String indexPath = LuceneIndexLookupUtil.getOldFullTextIndexPath(rootState, filter, tracker); |
| if (indexPath == null){ |
| return Collections.emptyList(); |
| } |
| return Collections.singletonList(planBuilder(filter) |
| .setCostPerExecution(getMinimumCost()) |
| .setAttribute(ATTR_INDEX_PATH, indexPath) |
| .build()); |
| } |
| } |
| } |