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TupleSerialKeyExtractor (Sleepycat Software, Inc. - Berkeley DB Java API)
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com.sleepycat.bdb.bind.serial</FONT>
<BR>
Class TupleSerialKeyExtractor</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">java.lang.Object</A>
|
+--<B>com.sleepycat.bdb.bind.serial.TupleSerialKeyExtractor</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialMarshalledKeyExtractor.html">TupleSerialMarshalledKeyExtractor</A></DD>
</DL>
<HR>
<DL>
<DT>public abstract class <B>TupleSerialKeyExtractor</B><DT>extends <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">Object</A><DT>implements <A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></DL>
<P>
A abstract key extractor that uses a tuple key and a serial value. This
class takes care of serializing and deserializing the value data, and
converting the key data to/from <A HREF="../../../../../com/sleepycat/bdb/bind/tuple/TupleInput.html"><CODE>TupleInput</CODE></A> and <A HREF="../../../../../com/sleepycat/bdb/bind/tuple/TupleOutput.html"><CODE>TupleOutput</CODE></A>
objects. Its two abstract methods must be implemented by a concrete
subclass to extract and clear the index key using these objects.
<ul>
<li> <A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html#extractIndexKey(com.sleepycat.bdb.bind.tuple.TupleInput, java.lang.Object, com.sleepycat.bdb.bind.tuple.TupleOutput)"><CODE>extractIndexKey(TupleInput,Object,TupleOutput)</CODE></A> </li>
<li> <A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html#clearIndexKey(java.lang.Object)"><CODE>clearIndexKey(Object)</CODE></A> </li>
</ul>
<P>
<P>
<HR>
<P>
<!-- ======== NESTED CLASS SUMMARY ======== -->
<!-- =========== FIELD SUMMARY =========== -->
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html#TupleSerialKeyExtractor(com.sleepycat.bdb.bind.tuple.TupleFormat, com.sleepycat.bdb.bind.serial.SerialFormat, com.sleepycat.bdb.bind.tuple.TupleFormat)">TupleSerialKeyExtractor</A></B>(<A HREF="../../../../../com/sleepycat/bdb/bind/tuple/TupleFormat.html">TupleFormat</A> primaryKeyFormat,
<A HREF="../../../../../com/sleepycat/bdb/bind/serial/SerialFormat.html">SerialFormat</A> valueFormat,
<A HREF="../../../../../com/sleepycat/bdb/bind/tuple/TupleFormat.html">TupleFormat</A> indexKeyFormat)</CODE>
<BR>
Creates a tuple-serial key extractor.</TD>
</TR>
</TABLE>
<!-- ========== METHOD SUMMARY =========== -->
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<B>Method Summary</B></FONT></TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html#clearIndexKey(com.sleepycat.bdb.bind.DataBuffer)">clearIndexKey</A></B>(<A HREF="../../../../../com/sleepycat/bdb/bind/DataBuffer.html">DataBuffer</A> valueData)</CODE>
<BR>
Clears the index key in a value buffer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html#clearIndexKey(java.lang.Object)">clearIndexKey</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">Object</A> valueInputOutput)</CODE>
<BR>
Clears the index key in the deserialized value data.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html#extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)">extractIndexKey</A></B>(<A HREF="../../../../../com/sleepycat/bdb/bind/DataBuffer.html">DataBuffer</A> primaryKeyData,
<A HREF="../../../../../com/sleepycat/bdb/bind/DataBuffer.html">DataBuffer</A> valueData,
<A HREF="../../../../../com/sleepycat/bdb/bind/DataBuffer.html">DataBuffer</A> indexKeyData)</CODE>
<BR>
Extracts the index key data from primary key and value buffers.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html#extractIndexKey(com.sleepycat.bdb.bind.tuple.TupleInput, java.lang.Object, com.sleepycat.bdb.bind.tuple.TupleOutput)">extractIndexKey</A></B>(<A HREF="../../../../../com/sleepycat/bdb/bind/tuple/TupleInput.html">TupleInput</A> primaryKeyInput,
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">Object</A> valueInput,
<A HREF="../../../../../com/sleepycat/bdb/bind/tuple/TupleOutput.html">TupleOutput</A> indexKeyOutput)</CODE>
<BR>
Extracts the index key data from primary key tuple data and deserialized
value data.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../../com/sleepycat/bdb/bind/DataFormat.html">DataFormat</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html#getIndexKeyFormat()">getIndexKeyFormat</A></B>()</CODE>
<BR>
Returns the format of the index key data.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../../com/sleepycat/bdb/bind/DataFormat.html">DataFormat</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html#getPrimaryKeyFormat()">getPrimaryKeyFormat</A></B>()</CODE>
<BR>
Returns the format of the primary key data or null if the index key data
is not derived from the primary key data.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../../com/sleepycat/bdb/bind/DataFormat.html">DataFormat</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html#getValueFormat()">getValueFormat</A></B>()</CODE>
<BR>
Returns the format of the value data or null if the index key data is
not derived from the value data.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">Object</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#equals(java.lang.Object)">equals</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#getClass()">getClass</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#hashCode()">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#notify()">notify</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#notifyAll()">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#toString()">toString</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#wait()">wait</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#wait(long)">wait</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#wait(long, int)">wait</A></CODE></TD>
</TR>
</TABLE>
<P>
<!-- ============ FIELD DETAIL =========== -->
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="TupleSerialKeyExtractor(com.sleepycat.bdb.bind.tuple.TupleFormat, com.sleepycat.bdb.bind.serial.SerialFormat, com.sleepycat.bdb.bind.tuple.TupleFormat)"><!-- --></A><H3>
TupleSerialKeyExtractor</H3>
<PRE>
public <B>TupleSerialKeyExtractor</B>(<A HREF="../../../../../com/sleepycat/bdb/bind/tuple/TupleFormat.html">TupleFormat</A> primaryKeyFormat,
<A HREF="../../../../../com/sleepycat/bdb/bind/serial/SerialFormat.html">SerialFormat</A> valueFormat,
<A HREF="../../../../../com/sleepycat/bdb/bind/tuple/TupleFormat.html">TupleFormat</A> indexKeyFormat)</PRE>
<DL>
<DD>Creates a tuple-serial key extractor.
<P>
<DT><B>Parameters:</B><DD><CODE>primaryKeyFormat</CODE> - is the primary key format, or null if no
primary key data is used to construct the index key.<DD><CODE>valueFormat</CODE> - is the value format, or null if no value data is
used to construct the index key.<DD><CODE>indexKeyFormat</CODE> - is the index key format.</DL>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Method Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="getPrimaryKeyFormat()"><!-- --></A><H3>
getPrimaryKeyFormat</H3>
<PRE>
public <A HREF="../../../../../com/sleepycat/bdb/bind/DataFormat.html">DataFormat</A> <B>getPrimaryKeyFormat</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></CODE></B></DD>
<DD>Returns the format of the primary key data or null if the index key data
is not derived from the primary key data. If this method returns null,
then null will be passed for the <code>primaryKeyData</code> parameter
of <A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html#extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)"><CODE>KeyExtractor.extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)</CODE></A>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html#getPrimaryKeyFormat()">getPrimaryKeyFormat</A></CODE> in interface <CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the format of the primary key data or null.</DL>
</DD>
</DL>
<HR>
<A NAME="getValueFormat()"><!-- --></A><H3>
getValueFormat</H3>
<PRE>
public <A HREF="../../../../../com/sleepycat/bdb/bind/DataFormat.html">DataFormat</A> <B>getValueFormat</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></CODE></B></DD>
<DD>Returns the format of the value data or null if the index key data is
not derived from the value data. If this method returns null, then null
will be passed for the <code>valueData</code> parameter of <A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html#extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)"><CODE>KeyExtractor.extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)</CODE></A>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html#getValueFormat()">getValueFormat</A></CODE> in interface <CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the format of the value data or null.</DL>
</DD>
</DL>
<HR>
<A NAME="getIndexKeyFormat()"><!-- --></A><H3>
getIndexKeyFormat</H3>
<PRE>
public <A HREF="../../../../../com/sleepycat/bdb/bind/DataFormat.html">DataFormat</A> <B>getIndexKeyFormat</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></CODE></B></DD>
<DD>Returns the format of the index key data.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html#getIndexKeyFormat()">getIndexKeyFormat</A></CODE> in interface <CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the format of the index key data.</DL>
</DD>
</DL>
<HR>
<A NAME="extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)"><!-- --></A><H3>
extractIndexKey</H3>
<PRE>
public void <B>extractIndexKey</B>(<A HREF="../../../../../com/sleepycat/bdb/bind/DataBuffer.html">DataBuffer</A> primaryKeyData,
<A HREF="../../../../../com/sleepycat/bdb/bind/DataBuffer.html">DataBuffer</A> valueData,
<A HREF="../../../../../com/sleepycat/bdb/bind/DataBuffer.html">DataBuffer</A> indexKeyData)
throws <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/io/IOException.html">IOException</A></PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></CODE></B></DD>
<DD>Extracts the index key data from primary key and value buffers.
The index key is extracted when saving the data record identified by the
primary key and value buffers, in order to add or remove an index
entry in the database for that data record.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html#extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)">extractIndexKey</A></CODE> in interface <CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>primaryKeyData</CODE> - is the source primary key data, or null if no
primary key data is used to construct the index key, in which case
<A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html#getPrimaryKeyFormat()"><CODE>KeyExtractor.getPrimaryKeyFormat()</CODE></A> should also return null.<DD><CODE>valueData</CODE> - is the source value data, or null if no value data is
used to construct the index key, in which case <A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html#getValueFormat()"><CODE>KeyExtractor.getValueFormat()</CODE></A>
should also return null.<DD><CODE>indexKeyData</CODE> - is the destination index key buffer. For index keys
which are optionally present, the buffer's length should be set to zero
to indicate that the key is not present or null.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/io/IOException.html">IOException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="clearIndexKey(com.sleepycat.bdb.bind.DataBuffer)"><!-- --></A><H3>
clearIndexKey</H3>
<PRE>
public void <B>clearIndexKey</B>(<A HREF="../../../../../com/sleepycat/bdb/bind/DataBuffer.html">DataBuffer</A> valueData)
throws <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/io/IOException.html">IOException</A></PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></CODE></B></DD>
<DD>Clears the index key in a value buffer. The index key is cleared when
the index is for a foreign key identifying a record that has been
deleted. This method is called only if the <A HREF="../../../../../com/sleepycat/bdb/ForeignKeyIndex.html"><CODE>ForeignKeyIndex</CODE></A> is configured with <A HREF="../../../../../com/sleepycat/bdb/ForeignKeyIndex.html#ON_DELETE_CLEAR"><CODE>ForeignKeyIndex.ON_DELETE_CLEAR</CODE></A>. It is never called
for index keys that are derived from primary key data, since in this
case <A HREF="../../../../../com/sleepycat/bdb/ForeignKeyIndex.html#ON_DELETE_CLEAR"><CODE>ForeignKeyIndex.ON_DELETE_CLEAR</CODE></A> is not
allowed.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html#clearIndexKey(com.sleepycat.bdb.bind.DataBuffer)">clearIndexKey</A></CODE> in interface <CODE><A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html">KeyExtractor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>valueData</CODE> - is the source and destination value data. On entry
this contains the index key to be cleared. It should be changed by this
method such that <A HREF="../../../../../com/sleepycat/bdb/bind/KeyExtractor.html#extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)"><CODE>KeyExtractor.extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)</CODE></A> will extract a null key (set
the buffer length to zero). Other data in the buffer should remain
unchanged.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/io/IOException.html">IOException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="extractIndexKey(com.sleepycat.bdb.bind.tuple.TupleInput, java.lang.Object, com.sleepycat.bdb.bind.tuple.TupleOutput)"><!-- --></A><H3>
extractIndexKey</H3>
<PRE>
public abstract void <B>extractIndexKey</B>(<A HREF="../../../../../com/sleepycat/bdb/bind/tuple/TupleInput.html">TupleInput</A> primaryKeyInput,
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">Object</A> valueInput,
<A HREF="../../../../../com/sleepycat/bdb/bind/tuple/TupleOutput.html">TupleOutput</A> indexKeyOutput)
throws <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Extracts the index key data from primary key tuple data and deserialized
value data.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>primaryKeyInput</CODE> - is the <A HREF="../../../../../com/sleepycat/bdb/bind/tuple/TupleInput.html"><CODE>TupleInput</CODE></A> for the primary key
data, or null if no primary key data is used to construct the index key.<DD><CODE>valueInput</CODE> - is the deserialized value data, or null if no value
data is used to construct the index key.<DD><CODE>indexKeyOutput</CODE> - is the destination index key tuple. For index
keys which are optionally present, no tuple data should be output to
indicate that the key is not present or null.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/io/IOException.html">IOException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="clearIndexKey(java.lang.Object)"><!-- --></A><H3>
clearIndexKey</H3>
<PRE>
public abstract void <B>clearIndexKey</B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">Object</A> valueInputOutput)
throws <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Clears the index key in the deserialized value data.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>valueInputOutput</CODE> - is the source and destination deserialized value
data. On entry this contains the index key to be cleared. It should be
changed by this method such that <A HREF="../../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html#extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)"><CODE>extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)</CODE></A> will extract a
null key (not output any tuple data). Other data in the value object
should remain unchanged.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/io/IOException.html">IOException</A></CODE></DL>
</DD>
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