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BtreeCompressor
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com.sleepycat.db</FONT>
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Interface BtreeCompressor</H2>
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<DL>
<DT><PRE>public interface <B>BtreeCompressor</B></DL>
</PRE>

<P>
An interface specifying how Btree compression works.
<P>

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<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/BtreeCompressor.html#compress(com.sleepycat.db.Database, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry)">compress</A></B>(<A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A>&nbsp;db,
         <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;prevKey,
         <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;prevData,
         <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;key,
         <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;data,
         <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;dest)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The application-specific Btree compress callback.</TD>
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<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/BtreeCompressor.html#decompress(com.sleepycat.db.Database, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry)">decompress</A></B>(<A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A>&nbsp;db,
           <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;prevKey,
           <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;prevData,
           <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;compressed,
           <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;key,
           <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;data)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The application-specific Btree decompress callback.</TD>
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<A NAME="compress(com.sleepycat.db.Database, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry)"><!-- --></A><H3>
compress</H3>
<PRE>
boolean <B>compress</B>(<A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A>&nbsp;db,
                 <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;prevKey,
                 <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;prevData,
                 <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;key,
                 <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;data,
                 <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;dest)</PRE>
<DL>
<DD>The application-specific Btree compress callback.
    <p>
    The compress function must return true on success and false on failure. If
    the compressed data is larger than dest.getUserBufferLength() the function
    should set the required length in the dest DatabaseEntry via setSize and
    return false.
    <p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>db</CODE> - The enclosing database handle.<DD><CODE>prevKey</CODE> - A database entry representing the previous key from the compressed stream.<DD><CODE>prevData</CODE> - A database entry representing the data matching prevKey key entry.<DD><CODE>key</CODE> - A database entry representing representing the application supplied key.<DD><CODE>data</CODE> - A database entry representing representing the application supplied data.<DD><CODE>dest</CODE> - A database entry representing the data stored in the tree. This is where
    the callback function should write the compressed data.</DL>
</DD>
</DL>
<HR>

<A NAME="decompress(com.sleepycat.db.Database, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry)"><!-- --></A><H3>
decompress</H3>
<PRE>
boolean <B>decompress</B>(<A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A>&nbsp;db,
                   <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;prevKey,
                   <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;prevData,
                   <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;compressed,
                   <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;key,
                   <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;data)</PRE>
<DL>
<DD>The application-specific Btree decompress callback.
    <p>
    The decompress function must return true on success, and false on failure.
    <p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>db</CODE> - The enclosing database handle.<DD><CODE>prevKey</CODE> - A database entry representing the previous key from the compressed stream.<DD><CODE>prevData</CODE> - A database entry representing the data matching prevKey key entry.<DD><CODE>compressed</CODE> - A database entry representing the data stored in the tree. That is the
    compressed data.<DD><CODE>key</CODE> - A database entry representing representing the application supplied key.<DD><CODE>data</CODE> - A database entry representing representing the application supplied data.</DL>
</DD>
</DL>
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