/* * Copyright 2004 The Apache Software Foundation * * Licensed 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. */ using System; using Lucene.Net.Index; namespace Lucene.Net.Search { sealed class PhrasePositions { internal int doc; // current doc internal int position; // position in doc internal int count; // remaining pos in this doc internal int offset; // position in phrase internal TermPositions tp; // stream of positions internal PhrasePositions next; // used to make lists internal PhrasePositions(TermPositions t, int o) { tp = t; offset = o; } internal bool Next() { // increments to next doc if (!tp.Next()) { tp.Close(); // close stream doc = System.Int32.MaxValue; // sentinel value return false; } doc = tp.Doc(); position = 0; return true; } internal bool SkipTo(int target) { if (!tp.SkipTo(target)) { tp.Close(); // close stream doc = System.Int32.MaxValue; // sentinel value return false; } doc = tp.Doc(); position = 0; return true; } internal void FirstPosition() { count = tp.Freq(); // read first pos NextPosition(); } internal bool NextPosition() { if (count-- > 0) { // read subsequent pos's position = tp.NextPosition() - offset; return true; } else return false; } } }