/*
* 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;
namespace Lucene.Net.Highlight
{
/// Formats text with different color intensity depending on the score of the
/// term using the span tag. GradientFormatter uses a bgcolor argument to the font tag which
/// doesn't work in Mozilla, thus this class.
///
///
///
///
/// David Spencer dave@searchmorph.com
///
public class SpanGradientFormatter:GradientFormatter
{
public SpanGradientFormatter(float maxScore, System.String minForegroundColor, System.String maxForegroundColor, System.String minBackgroundColor, System.String maxBackgroundColor):base(maxScore, minForegroundColor, maxForegroundColor, minBackgroundColor, maxBackgroundColor)
{
}
public override System.String HighlightTerm(System.String originalText, TokenGroup tokenGroup)
{
if (tokenGroup.GetTotalScore() == 0)
return originalText;
float score = tokenGroup.GetTotalScore();
if (score == 0)
{
return originalText;
}
// try to size sb correctly
System.Text.StringBuilder sb = new System.Text.StringBuilder(originalText.Length + EXTRA);
sb.Append("");
sb.Append(originalText);
sb.Append("");
return sb.ToString();
}
// guess how much extra text we'll add to the text we're highlighting to try to avoid a StringBuffer resize
private const System.String TEMPLATE = "...";
private static readonly int EXTRA = TEMPLATE.Length;
}
}