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IndexWriter (Lucene 2.1.0 API)
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SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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org.apache.lucene.index</FONT>
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Class IndexWriter</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.IndexWriter</B>
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<DT>public class <B>IndexWriter</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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An IndexWriter creates and maintains an index. <p>The third argument (<code>create</code>) to the <a href="#IndexWriter(org.apache.lucene.store.Directory, org.apache.lucene.analysis.Analyzer, boolean)"><b>constructor</b></a> determines whether a new index is created, or whether an existing index is opened for the addition of new documents. Note that you can open an index with create=true even while readers are using the index. The old readers will continue to search the "point in time" snapshot they had opened, and won't see the newly created index until they re-open.</p> <p>In either case, documents are added with the <a href="#addDocument(org.apache.lucene.document.Document)"><b>addDocument</b></a> method. When finished adding documents, <a href="#close()"><b>close</b></a> should be called.</p> <p>If an index will not have more documents added for a while and optimal search performance is desired, then the <a href="#optimize()"><b>optimize</b></a> method should be called before the index is closed.</p> <p>Opening an IndexWriter creates a lock file for the directory in use. Trying to open another IndexWriter on the same directory will lead to an IOException. The IOException is also thrown if an IndexReader on the same directory is used to delete documents from the index.</p> <p>As of <b>2.1</b>, IndexWriter can now delete documents by <A HREF="../../../../org/apache/lucene/index/Term.html" title="class in org.apache.lucene.index"><CODE>Term</CODE></A> (see <A HREF="../../../../org/apache/lucene/index/IndexWriter.html#deleteDocuments(org.apache.lucene.index.Term)"><CODE>deleteDocuments(org.apache.lucene.index.Term)</CODE></A> ) and update (delete then add) documents (see <A HREF="../../../../org/apache/lucene/index/IndexWriter.html#updateDocument(org.apache.lucene.index.Term, org.apache.lucene.document.Document)"><CODE>updateDocument(org.apache.lucene.index.Term, org.apache.lucene.document.Document)</CODE></A>). Deletes are buffered until <A HREF="../../../../org/apache/lucene/index/IndexWriter.html#setMaxBufferedDeleteTerms(int)"><CODE>setMaxBufferedDeleteTerms(int)</CODE></A> <code>Terms</code> at which point they are flushed to the index. Note that a flush occurs when there are enough buffered deletes or enough added documents, whichever is sooner. When a flush occurs, both pending deletes and added documents are flushed to the index.</p>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#DEFAULT_MAX_BUFFERED_DELETE_TERMS">DEFAULT_MAX_BUFFERED_DELETE_TERMS</A></B></CODE>
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Default value is 1000.</TD>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#DEFAULT_MAX_BUFFERED_DOCS">DEFAULT_MAX_BUFFERED_DOCS</A></B></CODE>
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Default value is 10.</TD>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#DEFAULT_MAX_FIELD_LENGTH">DEFAULT_MAX_FIELD_LENGTH</A></B></CODE>
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Default value is 10,000.</TD>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#DEFAULT_MAX_MERGE_DOCS">DEFAULT_MAX_MERGE_DOCS</A></B></CODE>
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Default value is <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Integer.html#MAX_VALUE" title="class or interface in java.lang"><CODE>Integer.MAX_VALUE</CODE></A>.</TD>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#DEFAULT_MERGE_FACTOR">DEFAULT_MERGE_FACTOR</A></B></CODE>
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Default value is 10.</TD>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#DEFAULT_TERM_INDEX_INTERVAL">DEFAULT_TERM_INDEX_INTERVAL</A></B></CODE>
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Default value is 128.</TD>
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<CODE>static <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#WRITE_LOCK_NAME">WRITE_LOCK_NAME</A></B></CODE>
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<CODE>static long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#WRITE_LOCK_TIMEOUT">WRITE_LOCK_TIMEOUT</A></B></CODE>
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Default value for the write lock timeout (1,000).</TD>
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<B>Constructor Summary</B></FONT></TD>
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<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#IndexWriter(org.apache.lucene.store.Directory, org.apache.lucene.analysis.Analyzer)">IndexWriter</A></B>(<A HREF="../../../../org/apache/lucene/store/Directory.html" title="class in org.apache.lucene.store">Directory</A> d, <A HREF="../../../../org/apache/lucene/analysis/Analyzer.html" title="class in org.apache.lucene.analysis">Analyzer</A> a)</CODE>
<BR>
Constructs an IndexWriter for the index in <code>d</code>, creating it first if it does not already exist, otherwise appending to the existing index.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#IndexWriter(org.apache.lucene.store.Directory, org.apache.lucene.analysis.Analyzer, boolean)">IndexWriter</A></B>(<A HREF="../../../../org/apache/lucene/store/Directory.html" title="class in org.apache.lucene.store">Directory</A> d, <A HREF="../../../../org/apache/lucene/analysis/Analyzer.html" title="class in org.apache.lucene.analysis">Analyzer</A> a, boolean create)</CODE>
<BR>
Constructs an IndexWriter for the index in <code>d</code>.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#IndexWriter(java.io.File, org.apache.lucene.analysis.Analyzer)">IndexWriter</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> path, <A HREF="../../../../org/apache/lucene/analysis/Analyzer.html" title="class in org.apache.lucene.analysis">Analyzer</A> a)</CODE>
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Constructs an IndexWriter for the index in <code>path</code>, creating it first if it does not already exist, otherwise appending to the existing index.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#IndexWriter(java.io.File, org.apache.lucene.analysis.Analyzer, boolean)">IndexWriter</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> path, <A HREF="../../../../org/apache/lucene/analysis/Analyzer.html" title="class in org.apache.lucene.analysis">Analyzer</A> a, boolean create)</CODE>
<BR>
Constructs an IndexWriter for the index in <code>path</code>.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/apache/lucene/index/IndexWriter.html#IndexWriter(java.lang.String, org.apache.lucene.analysis.Analyzer)">IndexWriter</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> path, <A HREF="../../../../org/apache/lucene/analysis/Analyzer.html" title="class in org.apache.lucene.analysis">Analyzer</A> a)</CODE>
<BR>
Constructs an IndexWriter for the index in <code>path</code>, creating it first if it does not already exist, otherwise appending to the existing index.</TD>
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