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KeyExtractor (Sleepycat Software, Inc. - Berkeley DB Java API)
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<b>Berkeley DB</b><br><font size="-1"> version 4.2.52</font></EM>
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com.sleepycat.bdb.bind</FONT>
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Interface KeyExtractor</H2>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../com/sleepycat/bdb/bind/serial/SerialSerialKeyExtractor.html">SerialSerialKeyExtractor</A>, <A HREF="../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html">TupleSerialKeyExtractor</A>, <A HREF="../../../../com/sleepycat/bdb/bind/tuple/TupleTupleKeyExtractor.html">TupleTupleKeyExtractor</A></DD>
</DL>
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<DL>
<DT>public interface <B>KeyExtractor</B></DL>
<P>
The interface implemented for extracting the index key from primary key
and/or value buffers, and for clearing the index key in a value buffer. The
implementation of this interface defines a specific index key for use in a
database, and that is independent of any bindings that may be used.
<P>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/bdb/bind/KeyExtractor.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>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><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></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>
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<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/KeyExtractor.html#getIndexKeyFormat()">getIndexKeyFormat</A></B>()</CODE>
<BR>
Returns the format of the index key data.</TD>
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<CODE> <A HREF="../../../../com/sleepycat/bdb/bind/DataFormat.html">DataFormat</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/bdb/bind/KeyExtractor.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>
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<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/KeyExtractor.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>
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<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>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>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>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>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>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>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>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="getPrimaryKeyFormat()"><!-- --></A><H3>
getPrimaryKeyFormat</H3>
<PRE>
public <A HREF="../../../../com/sleepycat/bdb/bind/DataFormat.html">DataFormat</A> <B>getPrimaryKeyFormat</B>()</PRE>
<DL>
<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>extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)</CODE></A>.
<P>
<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>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>extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)</CODE></A>.
<P>
<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>Returns the format of the index key data.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the format of the index key data.</DL>
</DD>
</DL>
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