/*
* 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 ExactPhraseScorer : PhraseScorer
{
internal ExactPhraseScorer(Weight weight, TermPositions[] tps, int[] positions, Similarity similarity, byte[] norms) : base(weight, tps, positions, similarity, norms)
{
}
protected internal override float PhraseFreq()
{
// sort list with pq
for (PhrasePositions pp = first; pp != null; pp = pp.next)
{
pp.FirstPosition();
pq.Put(pp); // build pq from list
}
PqToList(); // rebuild list from pq
int freq = 0;
do
{
// find position w/ all terms
while (first.position < last.position)
{
// scan forward in first
do
{
if (!first.NextPosition())
{
return (float) freq;
}
}
while (first.position < last.position);
FirstToLast();
}
freq++; // all equal: a match
}
while (last.NextPosition());
return (float) freq;
}
}
}
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