/*
* 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 System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Lucene.Net.Search.Highlight
{
///
/// Lightweight class to hold term, Weight, and positions used for scoring this term.
///
public class WeightedSpanTerm : WeightedTerm
{
private bool _positionSensitive;
private readonly List _positionSpans = new List();
public WeightedSpanTerm(float weight, String term)
: base(weight, term)
{
this._positionSpans = new List();
}
public WeightedSpanTerm(float weight, String term, bool positionSensitive)
: base(weight, term)
{
this._positionSensitive = positionSensitive;
}
///
/// Checks to see if this term is valid at position.
///
/// to check against valid term postions
/// true iff this term is a hit at this position
public bool CheckPosition(int position)
{
// There would probably be a slight speed improvement if PositionSpans
// where kept in some sort of priority queue - that way this method
// could
// bail early without checking each PositionSpan.
foreach (var positionSpan in _positionSpans)
{
if (((position >= positionSpan.Start) && (position <= positionSpan.End)))
{
return true;
}
}
return false;
}
public void AddPositionSpans(List positionSpans)
{
this._positionSpans.AddRange(positionSpans);
}
public bool IsPositionSensitive()
{
return _positionSensitive;
}
public void SetPositionSensitive(bool positionSensitive)
{
this._positionSensitive = positionSensitive;
}
public List GetPositionSpans()
{
return _positionSpans;
}
}
// Utility class to store a Span
public class PositionSpan
{
public int Start { get; private set; }
public int End { get; private set; }
public PositionSpan(int start, int end)
{
this.Start = start;
this.End = end;
}
}
}