| using System.Text; |
| |
| namespace Lucene.Net.Search.Highlight |
| { |
| /* |
| * 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. |
| */ |
| |
| /// <summary> Simple <see cref="IFormatter"/> implementation to highlight terms with a pre and post tag</summary> |
| /// <author> MAHarwood </author> |
| public class SimpleHTMLFormatter : IFormatter |
| { |
| private const string DEFAULT_PRE_TAG = "<B>"; |
| private const string DEFAULT_POST_TAG = "</B>"; |
| |
| internal string preTag; |
| internal string postTag; |
| |
| public SimpleHTMLFormatter(string preTag, string postTag) |
| { |
| this.preTag = preTag; |
| this.postTag = postTag; |
| } |
| |
| /// <summary> |
| /// Default constructor uses HTML: <B> tags to markup terms |
| /// </summary> |
| public SimpleHTMLFormatter() : this(DEFAULT_PRE_TAG, DEFAULT_POST_TAG) { } |
| |
| /// <summary> |
| /// <seealso cref="IFormatter.HighlightTerm(string, TokenGroup)"/> |
| /// </summary> |
| public virtual string HighlightTerm(string originalText, TokenGroup tokenGroup) |
| { |
| if (tokenGroup.TotalScore <= 0) |
| { |
| return originalText; |
| } |
| |
| // Allocate StringBuilder with the right number of characters from the |
| // beginning, to avoid char[] allocations in the middle of appends. |
| StringBuilder returnBuffer = new StringBuilder(preTag.Length + originalText.Length + postTag.Length); |
| returnBuffer.Append(preTag); |
| returnBuffer.Append(originalText); |
| returnBuffer.Append(postTag); |
| return returnBuffer.ToString(); |
| } |
| } |
| } |