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Remember the MoreLikeThis class in chapter 12 In addition, you ve been using the index examiner application Luke throughout this book, and we ll continue to use it in this chapter. Although we are by no means going to discuss all the libraries and applications available on the Lucene site, we will cover examples of a varied nature to give you a feel for what you will find there. It s not necessary to read this chapter in the order in which it s presented. Feel free to jump directly to any topic of interest and start there. We ll get started with the Lucene Sandbox and its collection of utility classes. After a section that mainly deals with extracting text from various document formats such as Adobe Systems PDF files and Microsoft documents and finishes with extracting text from a simple text file, we ll go over the contributions.
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13.1 Playing in the Sandbox
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The Sandbox is located at http://lucene.apache.org/java/docs/lucene-sandbox/ index.html, and the accompanying code repository is located at http:/ / svn.apache.org/repos/asf/lucene/java/trunk/contrib/. It deals with code donated by the core developers along with others interested in the Lucene project. The code is not actively maintained, so you may have to experiment with it. In addition to the items we will be talking about, the Sandbox contains such things as a large quantity of analyzers, tokenizers, and filters for many different languages. Also, it contains an ANT task that creates a Lucene index from the files specified by an ANT fileset.
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As of this writing, the fate of the Sandbox is up in the air. The authors were informed that it is no longer being maintained, and some of the classes there have been adopted into the Lucene core. We re going to discuss two of them BoostingQuery and RegexQuery. We still consider these two classes important to discuss so that you can see their inner workings and possibly adapt them to your own code if needed. Besides, that s what the Sandbox is for.
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After looking at a term highlighter, we will revisit a topic discussed in chapter 12, scoring and the BoostingQuery. Depending on the circumstances, this utility class may save you a lot of work. The last parts of this section, before we move on to the contributions, will cover various types of query classes such as synonym and regular expression (regex) queries.
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13.1.1 Making results stand out with the term Highlighter class
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The first set of classes we ll examine allows us to change the output format of the terms that match our queries. The Lucene source code contains these classes and is located at lucene_install_directory/contrib/highlighter/src/java/org/apache/lucene /search/highlight. These classes are also included in a precompiled .jar file, lucenehighlighter, located at lucene_install_directory/contrib/highlighter, which needs to be placed in your classpath.
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Playing in the Sandbox
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In the following example and in several of the remaining examples in this chapter, we ll make use of the Dvd class. This simple class is shown here, and it will allow us to demonstrate the points we re trying to make without overly complicating matters.
@Entity @Indexed @Analyzer(impl = StandardAnalyzer.class) public class Dvd { private Integer id; private String title; private String description; @Id @DocumentId public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } @Field(index = Index.TOKENIZED, store = Store.YES) public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } @Field(index = Index.TOKENIZED, store = Store.YES) public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } }
Listing 13.1 demonstrates how to use the highlighter classes to make the query-matching terms conspicuous.
Listing 13.1 Using Highlighter to make query result terms more conspicuous
public class TestHighlighter extends SearchTestCase { private IndexReader reader; private Analyzer analyzer = new StandardAnalyzer(); ReaderProvider readerProvider; String desc[] = { "Keanu Reeves is completely wooden in this romantic misfire. Reeves plays a traveling salesman and agrees to help a woman", "Jamie Lee Curtis finds out that he's not really a salesman and Bill Paxton is a used-car salesman."
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