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Apache Lucene - Basic Demo Sources Walk-through
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< h1 >
Apache Lucene - Basic Demo Sources Walk-through
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< a href = "#About the Code" > About the Code< / a >
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< a href = "#Location of the source" > Location of the source< / a >
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< a href = "#IndexFiles" > IndexFiles< / a >
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< a href = "#Searching Files" > Searching Files< / a >
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< a name = "N10013" > < / a > < a name = "About the Code" > < / a >
< h2 class = "boxed" > About the Code< / h2 >
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< p >
In this section we walk through the sources behind the command-line Lucene demo: where to find them,
their parts and their function. This section is intended for Java developers wishing to understand
how to use Lucene in their applications.
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< a name = "N1001C" > < / a > < a name = "Location of the source" > < / a >
< h2 class = "boxed" > Location of the source< / h2 >
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< p >
Relative to the directory created when you extracted Lucene or retrieved it from Subversion, you
should see a directory called < span class = "codefrag" > src< / span > which in turn contains a directory called
< span class = "codefrag" > demo< / span > . This is the root for all of the Lucene demos. Under this directory is
< span class = "codefrag" > org/apache/lucene/demo< / span > . This is where all the Java sources for the demos live.
< / p >
< p >
Within this directory you should see the < span class = "codefrag" > IndexFiles.java< / span > class we executed earlier.
Bring it up in < span class = "codefrag" > vi< / span > or your editor of choice and let's take a look at it.
< / p >
< / div >
< a name = "N10037" > < / a > < a name = "IndexFiles" > < / a >
< h2 class = "boxed" > IndexFiles< / h2 >
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< p >
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As we discussed in the previous walk-through, the < a href = "api/demo/org/apache/lucene/demo/IndexFiles.html" > IndexFiles< / a > class creates a Lucene
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Index. Let's take a look at how it does this.
< / p >
< p >
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The first substantial thing the < span class = "codefrag" > main< / span > function does is instantiate < a href = "api/core/org/apache/lucene/index/IndexWriter.html" > IndexWriter< / a > . It passes the string
"< span class = "codefrag" > index< / span > " and a new instance of a class called < a href = "api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html" > StandardAnalyzer< / a > .
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The "< span class = "codefrag" > index< / span > " string is the name of the filesystem directory where all index information
should be stored. Because we're not passing a full path, this will be created as a subdirectory of
the current working directory (if it does not already exist). On some platforms, it may be created
in other directories (such as the user's home directory).
< / p >
< p >
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The < a href = "api/core/org/apache/lucene/index/IndexWriter.html" > IndexWriter< / a > is the main
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class responsible for creating indices. To use it you must instantiate it with a path that it can
write the index into. If this path does not exist it will first create it. Otherwise it will
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refresh the index at that path. You can also create an index using one of the subclasses of < a href = "api/core/org/apache/lucene/store/Directory.html" > Directory< / a > . In any case, you must also pass an
instance of < a href = "api/core/org/apache/lucene/analysis/Analyzer.html" > org.apache.lucene.analysis.Analyzer< / a > .
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< / p >
< p >
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The particular < a href = "api/core/org/apache/lucene/analysis/Analyzer.html" > Analyzer< / a > we
are using, < a href = "api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html" > StandardAnalyzer< / a > , is
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little more than a standard Java Tokenizer, converting all strings to lowercase and filtering out
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stop words and characters from the index. By stop words and characters I mean common language
words such as articles (a, an, the, etc.) and other strings that may have less value for searching
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(e.g. < b > 's< / b > ) . It should be noted that there are different rules for every language, and you
should use the proper analyzer for each. Lucene currently provides Analyzers for a number of
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different languages (see the < span class = "codefrag" > *Analyzer.java< / span > sources under < a href = "http://svn.apache.org/repos/asf/lucene/java/trunk/contrib/analyzers/common/src/java/org/apache/lucene/analysis/" > contrib/analyzers/src/java/org/apache/lucene/analysis< / a > ).
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< / p >
< p >
Looking further down in the file, you should see the < span class = "codefrag" > indexDocs()< / span > code. This recursive
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function simply crawls the directories and uses < a href = "api/demo/org/apache/lucene/demo/FileDocument.html" > FileDocument< / a > to create < a href = "api/core/org/apache/lucene/document/Document.html" > Document< / a > objects. The < a href = "api/core/org/apache/lucene/document/Document.html" > Document< / a > is simply a data object to
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represent the content in the file as well as its creation time and location. These instances are
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added to the < span class = "codefrag" > indexWriter< / span > . Take a look inside < a href = "api/demo/org/apache/lucene/demo/FileDocument.html" > FileDocument< / a > . It's not particularly
complicated. It just adds fields to the < a href = "api/core/org/apache/lucene/document/Document.html" > Document< / a > .
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< / p >
< p >
As you can see there isn't much to creating an index. The devil is in the details. You may also
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wish to examine the other samples in this directory, particularly the < a href = "api/demo/org/apache/lucene/demo/IndexHTML.html" > IndexHTML< / a > class. It is a bit more
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complex but builds upon this example.
< / p >
< / div >
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< a name = "N100A0" > < / a > < a name = "Searching Files" > < / a >
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< h2 class = "boxed" > Searching Files< / h2 >
< div class = "section" >
< p >
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The < a href = "api/demo/org/apache/lucene/demo/SearchFiles.html" > SearchFiles< / a > class is
quite simple. It primarily collaborates with an < a href = "api/core/org/apache/lucene/search/IndexSearcher.html" > IndexSearcher< / a > , < a href = "api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html" > StandardAnalyzer< / a >
(which is used in the < a href = "api/core/org/apache/lucene/demo/IndexFiles.html" > IndexFiles< / a > class as well) and a
< a href = "api/core/org/apache/lucene/queryParser/QueryParser.html" > QueryParser< / a > . The
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query parser is constructed with an analyzer used to interpret your query text in the same way the
documents are interpreted: finding the end of words and removing useless words like 'a', 'an' and
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'the'. The < a href = "api/core/org/apache/lucene/search/Query.html" > Query< / a > object contains
the results from the < a href = "api/core/org/apache/lucene/queryParser/QueryParser.html" > QueryParser< / a > which is passed to
the searcher. Note that it's also possible to programmatically construct a rich < a href = "api/core/org/apache/lucene/search/Query.html" > Query< / a > object without using the query
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parser. The query parser just enables decoding the < a href = "queryparsersyntax.html" > Lucene query
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syntax< / a > into the corresponding < a href = "api/core/org/apache/lucene/search/Query.html" > Query< / a > object. Search can be executed in
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two different ways:
< ul >
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< li > Streaming: A < a href = "api/core/org/apache/lucene/search/Collector.html" > Collector< / a > subclass
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simply prints out the document ID and score for each matching document.< / li >
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< li > Paging: Using a < a href = "api/core/org/apache/lucene/search/TopScoreDocCollector.html" > TopScoreDocCollector< / a >
the search results are printed in pages, sorted by score (i. e. relevance).< / li >
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< / ul >
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< / p >
< / div >
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< a name = "N100E2" > < / a > < a name = "The Web example..." > < / a >
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< h2 class = "boxed" > The Web example...< / h2 >
< div class = "section" >
< p >
< a href = "demo3.html" > read on> > > < / a >
< / p >
< / div >
< / div >
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