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BitVector (Lucene 2.1.0 API)
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org.apache.lucene.util</FONT>
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Class BitVector</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.util.BitVector</B>
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<DT>public final class <B>BitVector</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>
<P>
Optimized implementation of a vector of bits. This is more-or-less like java.util.BitSet, but also includes the following: <ul> <li>a count() method, which efficiently computes the number of one bits;</li> <li>optimized read from and write to disk;</li> <li>inlinable get() method;</li> <li>store and load, as bit set or d-gaps, depending on sparseness;</li> </ul>
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<DT><B>Version:</B></DT> <DD>$Id: BitVector.java 494136 2007-01-08 18:11:08Z mikemccand $</DD><DT><B>Author:</B></DT> <DD>Doug Cutting</DD></DL>
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<TD><CODE><B><A HREF="../../../../org/apache/lucene/util/BitVector.html#BitVector(org.apache.lucene.store.Directory, java.lang.String)">BitVector</A></B>(<A HREF="../../../../org/apache/lucene/store/Directory.html" title="class in org.apache.lucene.store">Directory</A> d, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> name)</CODE>
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Constructs a bit vector from the file <code>name</code> in Directory <code>d</code>, as written by the <A HREF="../../../../org/apache/lucene/util/BitVector.html#write(org.apache.lucene.store.Directory, java.lang.String)"><CODE>write(org.apache.lucene.store.Directory, java.lang.String)</CODE></A> method.</TD>
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<TD><CODE><B><A HREF="../../../../org/apache/lucene/util/BitVector.html#BitVector(int)">BitVector</A></B>(int n)</CODE>
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Constructs a vector capable of holding <code>n</code> bits.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/util/BitVector.html#clear(int)">clear</A></B>(int bit)</CODE>
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Sets the value of <code>bit</code> to zero.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/util/BitVector.html#count()">count</A></B>()</CODE>
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Returns the total number of one bits in this vector.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/util/BitVector.html#get(int)">get</A></B>(int bit)</CODE>
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Returns <code>true</code> if <code>bit</code> is one and <code>false</code> if it is zero.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/util/BitVector.html#set(int)">set</A></B>(int bit)</CODE>
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Sets the value of <code>bit</code> to one.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/util/BitVector.html#size()">size</A></B>()</CODE>
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Returns the number of bits in this vector.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/lucene/util/BitVector.html#write(org.apache.lucene.store.Directory, java.lang.String)">write</A></B>(<A HREF="../../../../org/apache/lucene/store/Directory.html" title="class in org.apache.lucene.store">Directory</A> d, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> name)</CODE>
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Writes this vector to the file <code>name</code> in Directory <code>d</code>, in a format that can be read by the constructor <A HREF="../../../../org/apache/lucene/util/BitVector.html#BitVector(org.apache.lucene.store.Directory, java.lang.String)"><CODE>BitVector(Directory, String)</CODE></A>.</TD>
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