| /* |
| * 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.solr.search.facet; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.solr.search.DocIterator; |
| import org.apache.solr.search.facet.SlotAcc.CountSlotAcc; |
| import org.apache.solr.search.facet.SlotAcc.SweepCountAccStruct; |
| |
| abstract class SweepDocIterator implements DocIterator, SweepCountAware { |
| |
| public final int size; |
| |
| public SweepDocIterator(int size) { |
| this.size = size; |
| } |
| |
| static class SweepIteratorAndCounts { |
| final SweepDocIterator iter; |
| final CountSlotAcc[] countAccs; |
| public SweepIteratorAndCounts(SweepDocIterator iter, CountSlotAcc[] countAccs) { |
| this.iter = iter; |
| this.countAccs = countAccs; |
| } |
| } |
| |
| static SweepIteratorAndCounts newInstance(SweepCountAccStruct base, List<SweepCountAccStruct> others) throws IOException { |
| final int activeCt; |
| SweepCountAccStruct entry; |
| if (base == null) { |
| activeCt = others.size(); |
| entry = others.get(0); |
| } else { |
| activeCt = others.size() + 1; |
| entry = base; |
| } |
| if (activeCt == 1) { |
| final CountSlotAcc[] countAccs = new CountSlotAcc[] {entry.countAcc}; |
| return new SweepIteratorAndCounts(new SingletonDocIterator(entry.docSet.iterator(), base != null), countAccs); |
| } else { |
| final DocIterator[] subIterators = new DocIterator[activeCt]; |
| final CountSlotAcc[] countAccs = new CountSlotAcc[activeCt]; |
| Iterator<SweepCountAccStruct> othersIter = others.iterator(); |
| int i = 0; |
| for (;;) { |
| subIterators[i] = entry.docSet.iterator(); |
| countAccs[i] = entry.countAcc; |
| if (++i == activeCt) { |
| break; |
| } |
| entry = othersIter.next(); |
| } |
| return new SweepIteratorAndCounts(new UnionDocIterator(subIterators, base == null ? -1 : 0), countAccs); |
| } |
| } |
| |
| @Override |
| public float score() { |
| throw new UnsupportedOperationException("Not supported."); |
| } |
| |
| @Override |
| public Integer next() { |
| throw new UnsupportedOperationException("Not supported."); |
| } |
| |
| @Override |
| public abstract int registerCounts(SegCounter segCounts); // override to not throw IOException |
| |
| } |