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M OST PORTAL APPLICATION deployments require a search engine. Portals usually unify content and applications from across an organization, and users may not know where to go to find their information. Deploying a well-thought-out, integrated search engine inside your portal is not just about the search engine technology used some thought and design has to go into the overall information architecture of the portal and its component portlet applications. An important consideration is content delivery and display within the portal. How are you going to present the user with HTML content In our example, we deliver HTML content from the file system through to the portal page when the user clicks on a search result. Knowledge of information retrieval terms and techniques is extremely useful when designing a search engine implementation, as is an understanding of the user s needs and requirements for search. Launching a limited trial period, a beta, or an initial implementation helps to gather user feedback and real-world results: What terms are users searching for Do they understand the query language Are they using the query language or other advanced features Is the indexed content the set of content they need

txtBlock.removeEventListener("mouseLeftButtonDown", handleTxtClick);

Jakarta Apache Lucene (http://jakarta.apache.org/lucene) is an open source search engine written in Java and licensed under the Apache Software License. Lucene is not a full-featured search engine that is ready to plug in to your web application and go, like most commercial search engines. Lucene does not offer a default user interface, and you will need to develop your own integration code to plug it into your portal. Lucene also does not have any web crawlers or spiders, so you will be responsible for providing content to Lucene. Lucene has a well-defined Java API that abstracts most of the underlying information retrieval processing and concepts. Lucene s advantage is its flexibility. Because it makes no assumptions about what kind of repository your content is in, you can use Lucene in almost any Java application. Another advantage is that Lucene is open source, so if your search results are not what you expect, you can inspect the source code. Lucene also has

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 using using using using System; System.Collections.Generic; System.Runtime.Serialization; PrototypePattern;

The CaptureMouse method allows the object to receive mouse events even when the mouse isn t within its borders. This is typically used for dragging events, so that once you start dragging an object, you don t have to be within its bounds to continue dragging it. This is released using the ReleaseMouseCapture method. Here s an example where they are being used in conjunction with a handler for the MouseMove event, which will be discussed later in this chapter:

10

// Prototype Pattern Judith Bishop Dec 2006, Nov 2007 // Serializable is used for the deep copy option [Serializable( )] // Helper class used to create a second level data structure class DeeperData { public string Data {get; set;} public DeeperData(string s) { Data = s; } public override string ToString ( ) { return Data; } } [Serializable( )] class Prototype : IPrototype <Prototype> // Content members public string Country {get; set;} public string Capital {get; set;} public DeeperData Language {get; set;} public Prototype (string country, string capital, string language) { Country = country; Capital = capital; Language = new DeeperData(language); } public override string ToString( ) { return Country+"\t\t"+Capital+"\t\t->"+Language; } } [Serializable( )] class PrototypeManager : IPrototype <Prototype> { public Dictionary <string, Prototype> prototypes = new Dictionary <string, Prototype> { {"Germany", new Prototype ("Germany", "Berlin", "German")}, {"Italy", new Prototype ("Italy", "Rome", "Italian")},

a thriving community, and several third-party projects and tools are available that could be useful for your application. You ll find a collection of third-party contributions on the Lucene web page (http://jakarta.apache.org/lucene/docs/ contributions.html).

var isMouseCaptured; function handleLoad(control, context, sender) { var txtBlock=control.content.findName("txt"); txtBlock.addEventListener("MouseLeftButtonDown","mouseDown"); txtBlock.addEventListener("MouseLeftButtonUp","mouseUp"); txtBlock.addEventListener("MouseMove","mouseMove"); isMouseCaptured = false; } function mouseDown(sender,mouseEventArgs) { sender.captureMouse(); isMouseCaptured = true; } function mouseUp(sender, mouseEventArgs) { sender.releaseMouse(); isMouseCaptured = false; } function mouseMove(sender, mouseEventArgs) { if(isMouseCaptured) { sender.setValue("Canvas.Top", mouseEventArgs.getPosition(null).x); sender.setValue("Canvas.Left", mouseEventArgs.getPosition(null).y); } }

{

If you need a web crawler to spider your web site(s), try the open source project Nutch (www.nutch.org). Doug Cutting started the Nutch project and the Lucene project, and Nutch creates Lucene indexes.