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IndexModifier (Lucene 2.1.0 API)
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org.apache.lucene.index</FONT>
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Class IndexModifier</H2>
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<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>org.apache.lucene.index.IndexModifier</B>
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<DT>public class <B>IndexModifier</B><DT>extends <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL>
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<p>[Note that as of <b>2.1</b>, all but one of the methods in this class are available via <A HREF="../../../../org/apache/lucene/index/IndexWriter.html" title="class in org.apache.lucene.index"><CODE>IndexWriter</CODE></A>. The one method that is not available is <A HREF="../../../../org/apache/lucene/index/IndexModifier.html#deleteDocument(int)"><CODE>deleteDocument(int)</CODE></A>.]</p> A class to modify an index, i.e. to delete and add documents. This class hides <A HREF="../../../../org/apache/lucene/index/IndexReader.html" title="class in org.apache.lucene.index"><CODE>IndexReader</CODE></A> and <A HREF="../../../../org/apache/lucene/index/IndexWriter.html" title="class in org.apache.lucene.index"><CODE>IndexWriter</CODE></A> so that you do not need to care about implementation details such as that adding documents is done via IndexWriter and deletion is done via IndexReader. <p>Note that you cannot create more than one <code>IndexModifier</code> object on the same directory at the same time. <p>Example usage: <!-- ======================================================== --><!-- = Java Sourcecode to HTML automatically converted code = --><!-- = Java2Html Converter V4.1 2004 by Markus Gebhard markus@jave.de = --><!-- = Further information: http://www.java2html.de = --><div align="left" class="java"><table border="0" cellpadding="3" cellspacing="0" bgcolor="#ffffff"> <tr> <!-- start source code --> <td nowrap="nowrap" valign="top" align="left"> <code><font color="#ffffff"> </font><font color="#000000">Analyzer analyzer = </font><font color="#7f0055"><b>new </b></font><font color="#000000">StandardAnalyzer</font><font color="#000000">()</font><font color="#000000">;</font><br/><font color="#ffffff"> </font><font color="#3f7f5f">// create an index in /tmp/index, overwriting an existing one:</font><br/><font color="#ffffff"> </font><font color="#000000">IndexModifier indexModifier = </font><font color="#7f0055"><b>new </b></font><font color="#000000">IndexModifier</font><font color="#000000">(</font><font color="#2a00ff">"/tmp/index"</font><font color="#000000">, analyzer, </font><font color="#7f0055"><b>true</b></font><font color="#000000">)</font><font color="#000000">;</font><br/><font color="#ffffff"> </font><font color="#000000">Document doc = </font><font color="#7f0055"><b>new </b></font><font color="#000000">Document</font><font color="#000000">()</font><font color="#000000">;</font><br/><font color="#ffffff"> </font><font color="#000000">doc.add</font><font color="#000000">(</font><font color="#7f0055"><b>new </b></font><font color="#000000">Field</font><font color="#000000">(</font><font color="#2a00ff">"id"</font><font color="#000000">, </font><font color="#2a00ff">"1"</font><font color="#000000">, Field.Store.YES, Field.Index.UN_TOKENIZED</font><font color="#000000">))</font><font color="#000000">;</font><br/><font color="#ffffff"> </font><font color="#000000">doc.add</font><font color="#000000">(</font><font color="#7f0055"><b>new </b></font><font color="#000000">Field</font><font color="#000000">(</font><font color="#2a00ff">"body"</font><font color="#000000">, </font><font color="#2a00ff">"a simple test"</font><font color="#000000">, Field.Store.YES, Field.Index.TOKENIZED</font><font color="#000000">))</font><font color="#000000">;</font><br/><font color="#ffffff"> </font><font color="#000000">indexModifier.addDocument</font><font color="#000000">(</font><font color="#000000">doc</font><font color="#000000">)</font><font color="#000000">;</font><br/><font color="#ffffff"> </font><font color="#7f0055"><b>int </b></font><font color="#000000">deleted = indexModifier.delete</font><font color="#000000">(</font><font color="#7f0055"><b>new </b></font><font color="#000000">Term</font><font color="#000000">(</font><font color="#2a00ff">"id"</font><font color="#000000">, </font><font color="#2a00ff">"1"</font><font color="#000000">))</font><font color="#000000">;</font><br/><font color="#ffffff"> </font><font color="#000000">System.out.println</font><font color="#000000">(</font><font color="#2a00ff">"Deleted " </font><font color="#000000">+ deleted + </font><font color="#2a00ff">" document"</font><font color="#000000">)</font><font color="#000000">;</font><br/><font color="#ffffff"> </font><font color="#000000">indexModifier.flush</font><font color="#000000">()</font><font color="#000000">;</font><br/><font color="#ffffff"> </font><font color="#000000">System.out.println</font><font color="#000000">(</font><font color="#000000">indexModifier.docCount</font><font color="#000000">() </font><font color="#000000">+ </font><font color="#2a00ff">" docs in index"</font><font color="#000000">)</font><font color="#000000">;</font><br/><font color="#ffffff"> </font><font color="#000000">indexModifier.close</font><font color="#000000">()</font><font color="#000000">;</font></code> </td> <!-- end source code --> </tr></table></div><!-- = END of automatically generated HTML code = --><!-- ======================================================== --> <p>Not all methods of IndexReader and IndexWriter are offered by this class. If you need access to additional methods, either use those classes directly or implement your own class that extends <code>IndexModifier</code>. <p>Although an instance of this class can be used from more than one thread, you will not get the best performance. You might want to use IndexReader and IndexWriter directly for that (but you will need to care about synchronization yourself then). <p>While you can freely mix calls to add() and delete() using this class, you should batch you calls for best performance. For example, if you want to update 20 documents, you should first delete all those documents, then add all the new documents.
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<DT><B>Author:</B></DT> <DD>Daniel Naber</DD></DL>
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<CODE>protected <A HREF="../../../../org/apache/lucene/analysis/Analyzer.html" title="class in org.apache.lucene.analysis">Analyzer</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#analyzer">analyzer</A></B></CODE>
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<CODE>protected <A HREF="../../../../org/apache/lucene/store/Directory.html" title="class in org.apache.lucene.store">Directory</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#directory">directory</A></B></CODE>
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<CODE>protected <A HREF="../../../../org/apache/lucene/index/IndexReader.html" title="class in org.apache.lucene.index">IndexReader</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#indexReader">indexReader</A></B></CODE>
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<CODE>protected <A HREF="../../../../org/apache/lucene/index/IndexWriter.html" title="class in org.apache.lucene.index">IndexWriter</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#indexWriter">indexWriter</A></B></CODE>
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<CODE>protected <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/PrintStream.html" title="class or interface in java.io">PrintStream</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#infoStream">infoStream</A></B></CODE>
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<CODE>protected int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#maxBufferedDocs">maxBufferedDocs</A></B></CODE>
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<CODE>protected int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#maxFieldLength">maxFieldLength</A></B></CODE>
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<CODE>protected int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#mergeFactor">mergeFactor</A></B></CODE>
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<CODE>protected boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#open">open</A></B></CODE>
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<CODE>protected boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#useCompoundFile">useCompoundFile</A></B></CODE>
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<B>Constructor Summary</B></FONT></TD>
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<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#IndexModifier(org.apache.lucene.store.Directory, org.apache.lucene.analysis.Analyzer, boolean)">IndexModifier</A></B>(<A HREF="../../../../org/apache/lucene/store/Directory.html" title="class in org.apache.lucene.store">Directory</A> directory, <A HREF="../../../../org/apache/lucene/analysis/Analyzer.html" title="class in org.apache.lucene.analysis">Analyzer</A> analyzer, boolean create)</CODE>
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Open an index with write access.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#IndexModifier(java.io.File, org.apache.lucene.analysis.Analyzer, boolean)">IndexModifier</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/File.html" title="class or interface in java.io">File</A> file, <A HREF="../../../../org/apache/lucene/analysis/Analyzer.html" title="class in org.apache.lucene.analysis">Analyzer</A> analyzer, boolean create)</CODE>
<BR>
Open an index with write access.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexModifier.html#IndexModifier(java.lang.String, org.apache.lucene.analysis.Analyzer, boolean)">IndexModifier</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> dirName,⌨️ 快捷键说明
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