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/*
* 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.
*/
using System;
using Lucene.Net.Index;
namespace Lucene.Net.Search
{
sealed class ExactPhraseScorer:PhraseScorer
{
internal ExactPhraseScorer(Weight weight, TermPositions[] tps, int[] offsets, Similarity similarity, byte[] norms):base(weight, tps, offsets, similarity, norms)
{
}
protected internal override float PhraseFreq()
{
// 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;
}
}
}
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