| /* |
| * 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.comparators; |
| |
| import org.apache.lucene.search.DocIdSetIterator; |
| |
| import java.io.IOException; |
| |
| /** |
| * Docs iterator that starts iterating from a configurable minimum document |
| */ |
| public class MinDocIterator extends DocIdSetIterator { |
| final int segmentMinDoc; |
| final int maxDoc; |
| int doc = -1; |
| |
| MinDocIterator(int segmentMinDoc, int maxDoc) { |
| this.segmentMinDoc = segmentMinDoc; |
| this.maxDoc = maxDoc; |
| } |
| |
| @Override |
| public int docID() { |
| return doc; |
| } |
| |
| @Override |
| public int nextDoc() throws IOException { |
| return advance(doc + 1); |
| } |
| |
| @Override |
| public int advance(int target) throws IOException { |
| assert target > doc; |
| if (doc == -1) { |
| // skip directly to minDoc |
| doc = Math.max(target, segmentMinDoc); |
| } else { |
| doc = target; |
| } |
| if (doc >= maxDoc) { |
| doc = NO_MORE_DOCS; |
| } |
| return doc; |
| } |
| |
| @Override |
| public long cost() { |
| return maxDoc - segmentMinDoc; |
| } |
| } |