<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <!--NewPage--> <HTML> <HEAD> <!-- Generated by javadoc (build 1.6.0_18) on Thu Dec 02 16:59:38 UTC 2010 --> <TITLE> KeyExtractor </TITLE> <META NAME="date" CONTENT="2010-12-02"> <LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"> <SCRIPT type="text/javascript"> function windowTitle() { if (location.href.indexOf('is-external=true') == -1) { parent.document.title="KeyExtractor"; } } </SCRIPT> <NOSCRIPT> </NOSCRIPT> </HEAD> <BODY BGCOLOR="white" onload="windowTitle();"> <HR> <!-- ========= START OF TOP NAVBAR ======= --> <A NAME="navbar_top"><!-- --></A> <A HREF="#skip-navbar_top" title="Skip navigation links"></A> <TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""> <TR> <TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A NAME="navbar_top_firstrow"><!-- --></A> <TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR> </TABLE> </TD> <TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM> </EM> </TD> </TR> <TR> <TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../com/sleepycat/bdb/bind/EntityBinding.html" title="interface in com.sleepycat.bdb.bind"><B>PREV CLASS</B></A> <A HREF="../../../../com/sleepycat/bdb/bind/SimpleBuffer.html" title="class in com.sleepycat.bdb.bind"><B>NEXT CLASS</B></A></FONT></TD> <TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html?com/sleepycat/bdb/bind/KeyExtractor.html" target="_top"><B>FRAMES</B></A> <A HREF="KeyExtractor.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--> </SCRIPT> <NOSCRIPT> <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A> </NOSCRIPT> </FONT></TD> </TR> <TR> <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD> <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD> </TR> </TABLE> <A NAME="skip-navbar_top"></A> <!-- ========= END OF TOP NAVBAR ========= --> <HR> <!-- ======== START OF CLASS DATA ======== --> <H2> <FONT SIZE="-1"> com.sleepycat.bdb.bind</FONT> <BR> Interface KeyExtractor</H2> <DL> <DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../com/sleepycat/bdb/bind/serial/SerialSerialKeyExtractor.html" title="class in com.sleepycat.bdb.bind.serial">SerialSerialKeyExtractor</A>, <A HREF="../../../../com/sleepycat/bdb/bind/serial/TupleSerialKeyExtractor.html" title="class in com.sleepycat.bdb.bind.serial">TupleSerialKeyExtractor</A>, <A HREF="../../../../com/sleepycat/bdb/bind/serial/TupleSerialMarshalledKeyExtractor.html" title="class in com.sleepycat.bdb.bind.serial">TupleSerialMarshalledKeyExtractor</A>, <A HREF="../../../../com/sleepycat/bdb/bind/tuple/TupleTupleKeyExtractor.html" title="class in com.sleepycat.bdb.bind.tuple">TupleTupleKeyExtractor</A>, <A HREF="../../../../com/sleepycat/bdb/bind/tuple/TupleTupleMarshalledKeyExtractor.html" title="class in com.sleepycat.bdb.bind.tuple">TupleTupleMarshalledKeyExtractor</A></DD> </DL> <HR> <DL> <DT><PRE>public interface <B>KeyExtractor</B></DL> </PRE> <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> <P> <HR> <P> <!-- ========== METHOD SUMMARY =========== --> <A NAME="method_summary"><!-- --></A> <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> <B>Method Summary</B></FONT></TH> </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/KeyExtractor.html#clearIndexKey(com.sleepycat.bdb.bind.DataBuffer)">clearIndexKey</A></B>(<A HREF="../../../../com/sleepycat/bdb/bind/DataBuffer.html" title="interface in com.sleepycat.bdb.bind">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> 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" title="interface in com.sleepycat.bdb.bind">DataBuffer</A> primaryKeyData, <A HREF="../../../../com/sleepycat/bdb/bind/DataBuffer.html" title="interface in com.sleepycat.bdb.bind">DataBuffer</A> valueData, <A HREF="../../../../com/sleepycat/bdb/bind/DataBuffer.html" title="interface in com.sleepycat.bdb.bind">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> <A HREF="../../../../com/sleepycat/bdb/bind/DataFormat.html" title="interface in com.sleepycat.bdb.bind">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> </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" title="interface in com.sleepycat.bdb.bind">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> </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" title="interface in com.sleepycat.bdb.bind">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> </TR> </TABLE> <P> <!-- ============ METHOD DETAIL ========== --> <A NAME="method_detail"><!-- --></A> <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> <B>Method Detail</B></FONT></TH> </TR> </TABLE> <A NAME="extractIndexKey(com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer, com.sleepycat.bdb.bind.DataBuffer)"><!-- --></A><H3> extractIndexKey</H3> <PRE> void <B>extractIndexKey</B>(<A HREF="../../../../com/sleepycat/bdb/bind/DataBuffer.html" title="interface in com.sleepycat.bdb.bind">DataBuffer</A> primaryKeyData, <A HREF="../../../../com/sleepycat/bdb/bind/DataBuffer.html" title="interface in com.sleepycat.bdb.bind">DataBuffer</A> valueData, <A HREF="../../../../com/sleepycat/bdb/bind/DataBuffer.html" title="interface in com.sleepycat.bdb.bind">DataBuffer</A> indexKeyData) throws java.io.IOException</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. <DT><B>Throws:</B> <DD><CODE>java.io.IOException</CODE></DL> </DD> </DL> <HR> <A NAME="clearIndexKey(com.sleepycat.bdb.bind.DataBuffer)"><!-- --></A><H3> clearIndexKey</H3> <PRE> void <B>clearIndexKey</B>(<A HREF="../../../../com/sleepycat/bdb/bind/DataBuffer.html" title="interface in com.sleepycat.bdb.bind">DataBuffer</A> valueData) throws java.io.IOException</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" title="class in com.sleepycat.bdb"><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. <DT><B>Throws:</B> <DD><CODE>java.io.IOException</CODE></DL> </DD> </DL> <HR> <A NAME="getPrimaryKeyFormat()"><!-- --></A><H3> getPrimaryKeyFormat</H3> <PRE> <A HREF="../../../../com/sleepycat/bdb/bind/DataFormat.html" title="interface in com.sleepycat.bdb.bind">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> <A HREF="../../../../com/sleepycat/bdb/bind/DataFormat.html" title="interface in com.sleepycat.bdb.bind">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> <A HREF="../../../../com/sleepycat/bdb/bind/DataFormat.html" title="interface in com.sleepycat.bdb.bind">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> <!-- ========= END OF CLASS DATA ========= --> <HR> <!-- ======= START OF BOTTOM NAVBAR ====== --> <A NAME="navbar_bottom"><!-- --></A> <A HREF="#skip-navbar_bottom" title="Skip navigation links"></A> <TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""> <TR> <TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A NAME="navbar_bottom_firstrow"><!-- --></A> <TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR> </TABLE> </TD> <TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM> </EM> </TD> </TR> <TR> <TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../com/sleepycat/bdb/bind/EntityBinding.html" title="interface in com.sleepycat.bdb.bind"><B>PREV CLASS</B></A> <A HREF="../../../../com/sleepycat/bdb/bind/SimpleBuffer.html" title="class in com.sleepycat.bdb.bind"><B>NEXT CLASS</B></A></FONT></TD> <TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html?com/sleepycat/bdb/bind/KeyExtractor.html" target="_top"><B>FRAMES</B></A> <A HREF="KeyExtractor.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--> </SCRIPT> <NOSCRIPT> <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A> </NOSCRIPT> </FONT></TD> </TR> <TR> <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD> <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD> </TR> </TABLE> <A NAME="skip-navbar_bottom"></A> <!-- ======== END OF BOTTOM NAVBAR ======= --> <HR> </BODY> </HTML>