weight.html
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Weight (Lucene 2.1.0 API)
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org.apache.lucene.search</FONT>
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Interface Weight</H2>
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<DT><B>All Superinterfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/Serializable.html" title="class or interface in java.io">Serializable</A></DD>
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<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/apache/lucene/search/ConstantScoreQuery.ConstantWeight.html" title="class in org.apache.lucene.search">ConstantScoreQuery.ConstantWeight</A></DD>
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<DT>public interface <B>Weight</B><DT>extends <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/Serializable.html" title="class or interface in java.io">Serializable</A></DL>
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Expert: Calculate query weights and build query scorers. <p> The purpose of Weight is to make it so that searching does not modify a Query, so that a Query instance can be reused. <br> Searcher dependent state of the query should reside in the Weight. <br> IndexReader dependent state should reside in the Scorer. <p> A <code>Weight</code> is used in the following way: <ol> <li>A <code>Weight</code> is constructed by a top-level query, given a <code>Searcher</code> (<A HREF="../../../../org/apache/lucene/search/Query.html#createWeight(org.apache.lucene.search.Searcher)"><CODE>Query.createWeight(Searcher)</CODE></A>). <li>The <A HREF="../../../../org/apache/lucene/search/Weight.html#sumOfSquaredWeights()"><CODE>sumOfSquaredWeights()</CODE></A> method is called on the <code>Weight</code> to compute the query normalization factor <A HREF="../../../../org/apache/lucene/search/Similarity.html#queryNorm(float)"><CODE>Similarity.queryNorm(float)</CODE></A> of the query clauses contained in the query. <li>The query normalization factor is passed to <A HREF="../../../../org/apache/lucene/search/Weight.html#normalize(float)"><CODE>normalize(float)</CODE></A>. At this point the weighting is complete. <li>A <code>Scorer</code> is constructed by <A HREF="../../../../org/apache/lucene/search/Weight.html#scorer(org.apache.lucene.index.IndexReader)"><CODE>scorer(IndexReader)</CODE></A>. </ol>
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<CODE> <A HREF="../../../../org/apache/lucene/search/Explanation.html" title="class in org.apache.lucene.search">Explanation</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/search/Weight.html#explain(org.apache.lucene.index.IndexReader, int)">explain</A></B>(<A HREF="../../../../org/apache/lucene/index/IndexReader.html" title="class in org.apache.lucene.index">IndexReader</A> reader, int doc)</CODE>
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An explanation of the score computation for the named document.</TD>
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<CODE> <A HREF="../../../../org/apache/lucene/search/Query.html" title="class in org.apache.lucene.search">Query</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/search/Weight.html#getQuery()">getQuery</A></B>()</CODE>
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The query that this concerns.</TD>
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<CODE> float</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/search/Weight.html#getValue()">getValue</A></B>()</CODE>
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The weight for this query.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/search/Weight.html#normalize(float)">normalize</A></B>(float norm)</CODE>
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Assigns the query normalization factor to this.</TD>
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<CODE> <A HREF="../../../../org/apache/lucene/search/Scorer.html" title="class in org.apache.lucene.search">Scorer</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/search/Weight.html#scorer(org.apache.lucene.index.IndexReader)">scorer</A></B>(<A HREF="../../../../org/apache/lucene/index/IndexReader.html" title="class in org.apache.lucene.index">IndexReader</A> reader)</CODE>
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Constructs a scorer for this.</TD>
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<CODE> float</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/search/Weight.html#sumOfSquaredWeights()">sumOfSquaredWeights</A></B>()</CODE>
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The sum of squared weights of contained query clauses.</TD>
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