| /* |
| * 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.lucene.search; |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.index.LeafReaderContext; |
| |
| /** |
| * A collector that asserts that it is used correctly. |
| */ |
| class AssertingCollector extends FilterCollector { |
| |
| private int maxDoc = -1; |
| |
| /** Wrap the given collector in order to add assertions. */ |
| public static Collector wrap(Collector in) { |
| if (in instanceof AssertingCollector) { |
| return in; |
| } |
| return new AssertingCollector(in); |
| } |
| |
| private AssertingCollector(Collector in) { |
| super(in); |
| } |
| |
| @Override |
| public LeafCollector getLeafCollector(LeafReaderContext context) throws IOException { |
| final LeafCollector in = super.getLeafCollector(context); |
| final int docBase = context.docBase; |
| return new AssertingLeafCollector(in, 0, DocIdSetIterator.NO_MORE_DOCS) { |
| @Override |
| public void collect(int doc) throws IOException { |
| // check that documents are scored in order globally, |
| // not only per segment |
| assert docBase + doc >= maxDoc : "collection is not in order: current doc=" |
| + (docBase + doc) + " while " + maxDoc + " has already been collected"; |
| super.collect(doc); |
| maxDoc = docBase + doc; |
| } |
| }; |
| } |
| |
| } |