Dr. Dobb's Journal - October 2008 - (Page 55)

d10NG_p4db 8/14/08 3:16 PM Page 55 IndexSearcher searcher = new IndexSearcher(idxDir.FullName) User Interface Flow Double clicking on the ImageSearcher application brings up Figure 2. Next, I enter the directory name where the image files are stored or click the “ button (circled in …” green) and select the directory where the index will be created. If the index directory does not exist, it is created (Figure 3). I then enter the date ranges of the images I am interested in viewing (Figure 4). The “Search” text box contains the user comments stored in the images that I am interested in locating. This is optional. Once the search criteria have been entered, I click the “Search Me” button (Figure 4). Any images that satisfy the search criteria will be displayed in the Results panel. Figure 5 shows the results of a successful search being displayed in the results panel. I use the RangeQuery object to search for documents that match documents within an exclusive range. An instance of RangeQuery is created as follows: Term sTerm = new Term("datetime", startDateSearchString); Term eTerm = new Term("datetime", endDateSearchString); RangeQuery query = new RangeQuery(sTerm, eTerm, true); The last argument to the RangeQuery constructor is a Boolean flag, which is set to True if the query constructed is inclusive, or otherwise set to False. The query instance is then passed as an argument to the search method of IndexSearcher instance, Hits oHitColl = searcher.Search(query) Figure 5: Results of successful image search. This returns the documents that match the query. I extract the Document objects from the Hits object by calling the doc method as follows: string[] filesFound = null; if (oHitColl.Length() > 0) filesFound = new string[oHitColl.Length()]; for (int i = 0; i < oHitColl.Length(); i++) { Document oDoc = oHitColl.Doc(i); filesFound[i] = (string)oDoc.Get("path"); } Conclusion As you can see, the Lucene.NET and EXIFExtractor libraries can quickly be used Can Sexy to build an application that searches for images according to user-specified criteria, then display those images that match the search conditions on the results panel. Moreover, the application can be easily extended to include other search criteria such as shutter speed and camera make and model. DDJ In addition to the date/time fields, if I want to add the comments field to the search, I create a new Term query containing the user comments data. TermQuery tQuery = new TermQuery(new Term("comments", comments)) be Easy? YES - and now Sexy can be FREE! Check out our NEW release: Servoy 4.0 is an Eclipse Plug-In with a FREE community edition! Download today at www.servoy.com/sexy What is Servoy? Here's an excerpt from a recent eWeek product review: “For those tired of maintaining separate code bases for Web and desktop applications, Servoy offers a way to consolidate those code bases and cut development time in half.” Then I create a BooleanQuery object, BooleanQuery bQuery = new BooleanQuery(); bQuery.Add(rQuery, BooleanClause.Occur.MUST); bQuery.Add(tQuery, BooleanClause.Occur.MUST); I add both the TermQuery and RangeQuery objects to the BooleanQuery and pass this to the Search method of the IndexSearcher instance. This returns the documents that match the query. October 2008 l www.ddj.com l Dr. Dobb’s Journal 55 http://www.servoy.com/sexy http://www.servoy.com/sexy http://www.ddj.com

Table of Contents Feed for the Digital Edition of Dr. Dobb's Journal - October 2008

Dr. Dobb's Journal - October 2008 Contents Friday Night Fish Fry Alia Vox Developer Diaries Developer’s Notebook Is Your Next Language COBOL? Conversations Safe Coding Practices Code Signing in Adobe AIR OpenID Single Sign-On The Book Cipher Algorithm Indexing and Searching Image files Extending Continuous Integration Into ALM The Agile Edge Effective Concurrency Swaine’s Flames

Dr. Dobb's Journal - October 2008

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