| package org.apache.lucene.util; |
| |
| /* |
| * 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.search.DocIdSetIterator; |
| |
| /** OpenBitSet with added methods to bulk-update the bits |
| * from a {@link DocIdSetIterator}. */ |
| public class OpenBitSetDISI extends OpenBitSet { |
| |
| /** Construct an OpenBitSetDISI with its bits set |
| * from the doc ids of the given DocIdSetIterator. |
| * Also give a maximum size one larger than the largest doc id for which a |
| * bit may ever be set on this OpenBitSetDISI. |
| */ |
| public OpenBitSetDISI(DocIdSetIterator disi, int maxSize) throws IOException { |
| super(maxSize); |
| inPlaceOr(disi); |
| } |
| |
| /** Construct an OpenBitSetDISI with no bits set, and a given maximum size |
| * one larger than the largest doc id for which a bit may ever be set |
| * on this OpenBitSetDISI. |
| */ |
| public OpenBitSetDISI(int maxSize) { |
| super(maxSize); |
| } |
| |
| /** |
| * Perform an inplace OR with the doc ids from a given DocIdSetIterator, |
| * setting the bit for each such doc id. |
| * These doc ids should be smaller than the maximum size passed to the |
| * constructor. |
| */ |
| public void inPlaceOr(DocIdSetIterator disi) throws IOException { |
| int doc; |
| long size = size(); |
| while ((doc = disi.nextDoc()) < size) { |
| fastSet(doc); |
| } |
| } |
| |
| /** |
| * Perform an inplace AND with the doc ids from a given DocIdSetIterator, |
| * leaving only the bits set for which the doc ids are in common. |
| * These doc ids should be smaller than the maximum size passed to the |
| * constructor. |
| */ |
| public void inPlaceAnd(DocIdSetIterator disi) throws IOException { |
| int bitSetDoc = nextSetBit(0); |
| int disiDoc; |
| while (bitSetDoc != -1 && (disiDoc = disi.advance(bitSetDoc)) != DocIdSetIterator.NO_MORE_DOCS) { |
| clear(bitSetDoc, disiDoc); |
| bitSetDoc = nextSetBit(disiDoc + 1); |
| } |
| if (bitSetDoc != -1) { |
| clear(bitSetDoc, size()); |
| } |
| } |
| |
| /** |
| * Perform an inplace NOT with the doc ids from a given DocIdSetIterator, |
| * clearing all the bits for each such doc id. |
| * These doc ids should be smaller than the maximum size passed to the |
| * constructor. |
| */ |
| public void inPlaceNot(DocIdSetIterator disi) throws IOException { |
| int doc; |
| long size = size(); |
| while ((doc = disi.nextDoc()) < size) { |
| fastClear(doc); |
| } |
| } |
| |
| /** |
| * Perform an inplace XOR with the doc ids from a given DocIdSetIterator, |
| * flipping all the bits for each such doc id. |
| * These doc ids should be smaller than the maximum size passed to the |
| * constructor. |
| */ |
| public void inPlaceXor(DocIdSetIterator disi) throws IOException { |
| int doc; |
| long size = size(); |
| while ((doc = disi.nextDoc()) < size) { |
| fastFlip(doc); |
| } |
| } |
| } |