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SynonymMap (Lucene 2.1.0 API)
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org.apache.lucene.index.memory</FONT>
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Class SynonymMap</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.memory.SynonymMap</B>
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<DT>public class <B>SynonymMap</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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Loads the <a target="_blank" href="http://www.cogsci.princeton.edu/~wn/">WordNet </a> prolog file <a href="http://www.cogsci.princeton.edu/2.0/WNprolog-2.0.tar.gz">wn_s.pl </a> into a thread-safe main-memory hash map that can be used for fast high-frequency lookups of synonyms for any given (lowercase) word string. <p> There holds: If B is a synonym for A (A -> B) then A is also a synonym for B (B -> A). There does not necessarily hold: A -> B, B -> C then A -> C. <p> Loading typically takes some 1.5 secs, so should be done only once per (server) program execution, using a singleton pattern. Once loaded, a synonym lookup via <A HREF="../../../../../org/apache/lucene/index/memory/SynonymMap.html#getSynonyms(java.lang.String)"><CODE>getSynonyms(String)</CODE></A>takes constant time O(1). A loaded default synonym map consumes about 10 MB main memory. An instance is immutable, hence thread-safe. <p> This implementation borrows some ideas from the Lucene Syns2Index demo that Dave Spencer originally contributed to Lucene. Dave's approach involved a persistent Lucene index which is suitable for occasional lookups or very large synonym tables, but considered unsuitable for high-frequency lookups of medium size synonym tables. <p> Example Usage: <pre> String[] words = new String[] { "hard", "woods", "forest", "wolfish", "xxxx"}; SynonymMap map = new SynonymMap(new FileInputStream("samples/fulltext/wn_s.pl")); for (int i = 0; i < words.length; i++) { String[] synonyms = map.getSynonyms(words[i]); System.out.println(words[i] + ":" + java.util.Arrays.asList(synonyms).toString()); } Example output: hard:[arduous, backbreaking, difficult, fermented, firmly, grueling, gruelling, heavily, heavy, intemperately, knockout, laborious, punishing, severe, severely, strong, toilsome, tough] woods:[forest, wood] forest:[afforest, timber, timberland, wood, woodland, woods] wolfish:[edacious, esurient, rapacious, ravening, ravenous, voracious, wolflike] xxxx:[] </pre>
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<DT><B>Author:</B></DT> <DD>whoschek.AT.lbl.DOT.gov</DD><DT><B>See Also:</B><DD><a target="_blank" href="http://www.cogsci.princeton.edu/~wn/man/prologdb.5WN.html">prologdb man page </a>, <a target="_blank" href="http://www.hostmon.com/rfc/advanced.jsp">Dave's synonym demo site</a></DL>
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<TD><CODE><B><A HREF="../../../../../org/apache/lucene/index/memory/SynonymMap.html#SynonymMap(java.io.InputStream)">SynonymMap</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/InputStream.html" title="class or interface in java.io">InputStream</A> input)</CODE>
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Constructs an instance, loading WordNet synonym data from the given input stream.</TD>
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<CODE>protected <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>
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