/// <summary>
/// 在indexPath位置建立索引
/// </summary>
/// <param name="products">加入索引的产品集合</param>
/// <param name="indexPath">索引所在路径</param>
/// <returns></returns>
public static bool Insert(List <Article> articles, string indexPath)
{
bool indexFileIsExist = GlobalSettings.CheckFileExist(indexPath);
if (!indexFileIsExist)
{
try
{
GlobalSettings.EnsureDirectoryExists(indexPath);
}
catch { }
}
return(Insert(articles, indexPath, !indexFileIsExist));
}
/// <summary>
/// 在indexPath位置建立索引
/// </summary>
/// <param name="products">加入索引的产品集合</param>
/// <param name="indexPath">索引所在路径</param>
/// <returns></returns>
public static bool Insert(List <Product> products, string indexPath)
{
bool indexFileIsExist = GlobalSettings.CheckFileExist(indexPath);
if (!indexFileIsExist)
{
try
{
GlobalSettings.EnsureDirectoryExists(indexPath);
//System.IO.Directory.CreateDirectory(indexPath);
}
catch { }
}
return(Insert(products, indexPath, !indexFileIsExist));
}
public static SearchResultDataSet <Article> Search(ArticleQuery query)
{
//触发事件
GlobalEvents.UserSearch(query.Title);
//索引文件不存在时，返回null
if (!GlobalSettings.CheckFileExist(PhysicalIndexDirectory))
{
return(new SearchResultDataSet <Article>());
}
DateTime startTime = DateTime.Now;
BooleanQuery currentQuery = new BooleanQuery();
//CategoryID
if (query.CategoryID.HasValue && query.CategoryID.Value != 0)
{
Term categoryIDTearm = new Term(NewsIndexField.CategoryID, query.CategoryID.ToString());
Query categoryIDQuery = new TermQuery(categoryIDTearm);
currentQuery.Add(categoryIDQuery, BooleanClause.Occur.MUST);
}
//KeyWord
if (!string.IsNullOrEmpty(query.Title))
{
query.Title = SearchHelper.LuceneKeywordsScrubber(query.Title);
if (!string.IsNullOrEmpty(query.Title))
{
string[] searchFieldsForKeyword = new string[4];
searchFieldsForKeyword[0] = NewsIndexField.Title;
searchFieldsForKeyword[1] = NewsIndexField.SubTitle;
searchFieldsForKeyword[2] = NewsIndexField.Abstract;
searchFieldsForKeyword[3] = NewsIndexField.Keywords;
MultiFieldQueryParser articleWordQueryParser = new MultiFieldQueryParser(searchFieldsForKeyword, SearchHelper.GetChineseAnalyzer());
articleWordQueryParser.SetLowercaseExpandedTerms(true);
articleWordQueryParser.SetDefaultOperator(QueryParser.OR_OPERATOR);
string keyWordsSplit = SearchHelper.SplitKeywordsBySpace(query.Title);
Query articleWordQuery = articleWordQueryParser.Parse(keyWordsSplit);
currentQuery.Add(articleWordQuery, BooleanClause.Occur.MUST);
}
}
//Search
IndexSearcher searcher = new IndexSearcher(PhysicalIndexDirectory);
Hits hits = searcher.Search(currentQuery);
SearchResultDataSet <Article> articles = new SearchResultDataSet <Article>();
int pageLowerBound = query.PageIndex * query.PageSize;
int pageUpperBound = pageLowerBound + query.PageSize;
if (pageUpperBound > hits.Length())
{
pageUpperBound = hits.Length();
}
//HighLight
PanGu.HighLight.Highlighter highlighter = null;
if (!string.IsNullOrEmpty(query.Title))
{
highlighter = new PanGu.HighLight.Highlighter(new PanGu.HighLight.SimpleHTMLFormatter("<font color=\"#c60a00\">", "</font>"), new PanGu.Segment());
highlighter.FragmentSize = 100;
}
for (int i = pageLowerBound; i < pageUpperBound; i++)
{
Article item = ConvertDocumentToArticle(hits.Doc(i));
if (!string.IsNullOrEmpty(query.Title))
{
string bestBody = null;
if (!string.IsNullOrEmpty(item.Abstract) && item.Abstract.Length > MaxNumFragmentsRequired)
{
bestBody = highlighter.GetBestFragment(query.Title, item.Abstract);
}
if (!string.IsNullOrEmpty(bestBody))
{
item.Abstract = bestBody;
}
else
{
item.Abstract = HtmlHelper.TrimHtml(item.Abstract, 100);
}
string bestSubject = null;
if (!string.IsNullOrEmpty(item.Title) && item.Title.Length > MaxNumFragmentsRequired)
{
bestSubject = highlighter.GetBestFragment(query.Title, item.Title);
}
if (!string.IsNullOrEmpty(bestSubject))
{
item.Title = bestSubject;
}
}
articles.Records.Add(item);
}
searcher.Close();
articles.TotalRecords = hits.Length();
DateTime endTime = DateTime.Now;
articles.SearchDuration = (endTime.Ticks - startTime.Ticks) / 1E7f;
articles.PageIndex = query.PageIndex;
articles.PageSize = query.PageSize;
return(articles);
}
