| package org.apache.lucene.search; |
| /* |
| * 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. |
| */ |
| |
| import java.io.IOException; |
| import org.apache.lucene.util.Bits; |
| import org.apache.lucene.util.FixedBitSet; |
| import org.apache.lucene.util.OpenBitSet; |
| |
| /** |
| * Base class for DocIdSet to be used with DocValues. The implementation |
| * of its iterator is very stupid and slow if the implementation of the |
| * {@link #matchDoc} method is not optimized, as iterators simply increment |
| * the document id until {@code matchDoc(int)} returns true. Because of this |
| * {@code matchDoc(int)} must be as fast as possible and in no case do any |
| * I/O. |
| * @lucene.internal |
| */ |
| public abstract class DocValuesDocIdSet extends DocIdSet { |
| |
| protected final int maxDoc; |
| protected final Bits acceptDocs; |
| |
| public DocValuesDocIdSet(int maxDoc, Bits acceptDocs) { |
| this.maxDoc = maxDoc; |
| this.acceptDocs = acceptDocs; |
| } |
| |
| /** |
| * this method checks, if a doc is a hit |
| */ |
| protected abstract boolean matchDoc(int doc); |
| |
| /** |
| * this DocIdSet is always cacheable (does not go back |
| * to the reader for iteration) |
| */ |
| @Override |
| public final boolean isCacheable() { |
| return true; |
| } |
| |
| @Override |
| public final Bits bits() { |
| return (acceptDocs == null) ? new Bits() { |
| @Override |
| public boolean get(int docid) { |
| return matchDoc(docid); |
| } |
| |
| @Override |
| public int length() { |
| return maxDoc; |
| } |
| } : new Bits() { |
| @Override |
| public boolean get(int docid) { |
| return matchDoc(docid) && acceptDocs.get(docid); |
| } |
| |
| @Override |
| public int length() { |
| return maxDoc; |
| } |
| }; |
| } |
| |
| @Override |
| public final DocIdSetIterator iterator() throws IOException { |
| if (acceptDocs == null) { |
| // Specialization optimization disregard acceptDocs |
| return new DocIdSetIterator() { |
| private int doc = -1; |
| |
| @Override |
| public int docID() { |
| return doc; |
| } |
| |
| @Override |
| public int nextDoc() { |
| do { |
| doc++; |
| if (doc >= maxDoc) { |
| return doc = NO_MORE_DOCS; |
| } |
| } while (!matchDoc(doc)); |
| return doc; |
| } |
| |
| @Override |
| public int advance(int target) { |
| for(doc=target; doc<maxDoc; doc++) { |
| if (matchDoc(doc)) { |
| return doc; |
| } |
| } |
| return doc = NO_MORE_DOCS; |
| } |
| |
| @Override |
| public long cost() { |
| return maxDoc; |
| } |
| }; |
| } else if (acceptDocs instanceof FixedBitSet || acceptDocs instanceof OpenBitSet) { |
| // special case for FixedBitSet / OpenBitSet: use the iterator and filter it |
| // (used e.g. when Filters are chained by FilteredQuery) |
| return new FilteredDocIdSetIterator(((DocIdSet) acceptDocs).iterator()) { |
| @Override |
| protected boolean match(int doc) { |
| return DocValuesDocIdSet.this.matchDoc(doc); |
| } |
| }; |
| } else { |
| // Stupid consultation of acceptDocs and matchDoc() |
| return new DocIdSetIterator() { |
| private int doc = -1; |
| |
| @Override |
| public int docID() { |
| return doc; |
| } |
| |
| @Override |
| public int nextDoc() { |
| do { |
| doc++; |
| if (doc >= maxDoc) { |
| return doc = NO_MORE_DOCS; |
| } |
| } while (!(matchDoc(doc) && acceptDocs.get(doc))); |
| return doc; |
| } |
| |
| @Override |
| public int advance(int target) { |
| for(doc=target; doc<maxDoc; doc++) { |
| if (matchDoc(doc) && acceptDocs.get(doc)) { |
| return doc; |
| } |
| } |
| return doc = NO_MORE_DOCS; |
| } |
| |
| @Override |
| public long cost() { |
| return maxDoc; |
| } |
| }; |
| } |
| } |
| } |