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framework. <p> This class performs very well for very small texts (e.g. 10 chars) as well as for large texts (e.g. 10 MB) and everything in between. Typically, it is about 10-100 times faster than <code>RAMDirectory</code>. Note that <code>RAMDirectory</code> has particularly large efficiency overheads for small to medium sized texts, both in time and space. Indexing a field with N tokens takes O(N) in the best case, and O(N logN) in the worst case. Memory consumption is probably larger than for <code>RAMDirectory</code>. <p> Example throughput of many simple term queries over a single MemoryIndex: ~500000 queries/sec on a MacBook Pro, jdk 1.5.0_06, server VM. As always, your mileage may vary. <p> If you're curious about the whereabouts of bottlenecks, run java 1.5 with the non-perturbing '-server -agentlib:hprof=cpu=samples,depth=10' flags, then study the trace log and correlate its hotspot trailer with its call stack headers (see <a target="_blank" href="http://java.sun.com/developer/technicalArticles/Programming/HPROF.html"> hprof tracing </a>).
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<DT><B>Author:</B></DT> <DD>whoschek.AT.lbl.DOT.gov</DD></DL>
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<!-- ======== NESTED CLASS SUMMARY ======== -->
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<B>Constructor Summary</B></FONT></TD>
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<TD><CODE><B><A HREF="../../../../../org/apache/lucene/index/memory/MemoryIndex.html#MemoryIndex()">MemoryIndex</A></B>()</CODE>
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Constructs an empty instance.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/lucene/index/memory/MemoryIndex.html#addField(java.lang.String, java.lang.String, org.apache.lucene.analysis.Analyzer)">addField</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> fieldName, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> text, <A HREF="../../../../../org/apache/lucene/analysis/Analyzer.html" title="class in org.apache.lucene.analysis">Analyzer</A> analyzer)</CODE>
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Convenience method; Tokenizes the given field text and adds the resulting terms to the index; Equivalent to adding an indexed non-keyword Lucene <A HREF="../../../../../org/apache/lucene/document/Field.html" title="class in org.apache.lucene.document"><CODE>Field</CODE></A> that is <A HREF="../../../../../org/apache/lucene/document/Field.Index.html#TOKENIZED"><CODE>tokenized</CODE></A>, <A HREF="../../../../../org/apache/lucene/document/Field.Store.html#NO"><CODE>not stored</CODE></A>, <A HREF="../../../../../org/apache/lucene/document/Field.TermVector.html#WITH_POSITIONS"><CODE>termVectorStored with positions</CODE></A> (or <A HREF="../../../../../org/apache/lucene/document/Field.TermVector.html#WITH_POSITIONS"><CODE>termVectorStored with positions and offsets</CODE></A>),</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/lucene/index/memory/MemoryIndex.html#addField(java.lang.String, org.apache.lucene.analysis.TokenStream)">addField</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> fieldName, <A HREF="../../../../../org/apache/lucene/analysis/TokenStream.html" title="class in org.apache.lucene.analysis">TokenStream</A> stream)</CODE>
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Equivalent to <code>addField(fieldName, stream, 1.0f)</code>.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/lucene/index/memory/MemoryIndex.html#addField(java.lang.String, org.apache.lucene.analysis.TokenStream, float)">addField</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> fieldName, <A HREF="../../../../../org/apache/lucene/analysis/TokenStream.html" title="class in org.apache.lucene.analysis">TokenStream</A> stream, float boost)</CODE>
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Iterates over the given token stream and adds the resulting terms to the index; Equivalent to adding a tokenized, indexed, termVectorStored, unstored, Lucene <A HREF="../../../../../org/apache/lucene/document/Field.html" title="class in org.apache.lucene.document"><CODE>Field</CODE></A>.</TD>
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<CODE> <A HREF="../../../../../org/apache/lucene/search/IndexSearcher.html" title="class in org.apache.lucene.search">IndexSearcher</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/lucene/index/memory/MemoryIndex.html#createSearcher()">createSearcher</A></B>()</CODE>
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Creates and returns a searcher that can be used to execute arbitrary Lucene queries and to collect the resulting query results as hits.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/lucene/index/memory/MemoryIndex.html#getMemorySize()">getMemorySize</A></B>()</CODE>
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Returns a reasonable approximation of the main memory [bytes] consumed by this instance.</TD>
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<CODE> <A HREF="../../../../../org/apache/lucene/analysis/TokenStream.html" title="class in org.apache.lucene.analysis">TokenStream</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/lucene/index/memory/MemoryIndex.html#keywordTokenStream(java.util.Collection)">keywordTokenStream</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> keywords)</CODE>
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Convenience method; Creates and returns a token stream that generates a token for each keyword in the given collection, "as is", without any transforming text analysis.</TD>
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<CODE> float</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/lucene/index/memory/MemoryIndex.html#search(org.apache.lucene.search.Query)">search</A></B>(<A HREF="../../../../../org/apache/lucene/search/Query.html" title="class in org.apache.lucene.search">Query</A> query)</CODE>
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Convenience method that efficiently returns the relevance score by matching this index against the given Lucene query expression.</TD>
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<CODE> <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/memory/MemoryIndex.html#toString()">toString</A></B>()</CODE>
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Returns a String representation of the index data for debugging purposes.</TD>
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<TD><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TD>
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<TD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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<A NAME="MemoryIndex()"><!-- --></A><H3>
MemoryIndex</H3>
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public <B>MemoryIndex</B>()</PRE>
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<DD>Constructs an empty instance.
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<A NAME="addField(java.lang.String, java.lang.String, org.apache.lucene.analysis.Analyzer)"><!-- --></A><H3>
addField</H3>
<PRE>
public void <B>addField</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> fieldName, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> text,⌨️ 快捷键说明
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