| 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.index.*; |
| |
| final class ExactPhraseScorer extends PhraseScorer { |
| |
| ExactPhraseScorer(Weight weight, TermPositions[] tps, int[] offsets, |
| Similarity similarity, byte[] norms) { |
| super(weight, tps, offsets, similarity, norms); |
| } |
| |
| @Override |
| protected final float phraseFreq() throws IOException { |
| // sort list with pq |
| pq.clear(); |
| for (PhrasePositions pp = first; pp != null; pp = pp.next) { |
| pp.firstPosition(); |
| pq.add(pp); // build pq from list |
| } |
| pqToList(); // rebuild list from pq |
| |
| // for counting how many times the exact phrase is found in current document, |
| // just count how many times all PhrasePosition's have exactly the same position. |
| int freq = 0; |
| do { // find position w/ all terms |
| while (first.position < last.position) { // scan forward in first |
| do { |
| if (!first.nextPosition()) |
| return freq; |
| } while (first.position < last.position); |
| firstToLast(); |
| } |
| freq++; // all equal: a match |
| } while (last.nextPosition()); |
| |
| return freq; |
| } |
| } |