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MarshalledTupleKeyEntity (Sleepycat Software, Inc. - Berkeley DB Java API)
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com.sleepycat.bind.tuple</FONT>
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Interface MarshalledTupleKeyEntity</H2>
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<DL>
<DT>public interface <B>MarshalledTupleKeyEntity</B></DL>
<P>
A marshalling interface implemented by entity classes that represent keys as
tuples. Since <code>MarshalledTupleKeyEntity</code> objects are instantiated
using Java deserialization, no particular constructor is required by classes
that implement this interface.
<p>Note that a marshalled tuple key extractor is somewhat less efficient
than a non-marshalled key tuple extractor because more conversions are
needed. A marshalled key extractor must convert the entry to an object in
order to extract the key fields, while an unmarshalled key extractor does
not.</p>
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../com/sleepycat/bind/tuple/TupleTupleMarshalledBinding.html" title="class in com.sleepycat.bind.tuple"><CODE>TupleTupleMarshalledBinding</CODE></A>,
<A HREF="../../../../com/sleepycat/bind/serial/TupleSerialMarshalledBinding.html" title="class in com.sleepycat.bind.serial"><CODE>TupleSerialMarshalledBinding</CODE></A></DL>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/bind/tuple/MarshalledTupleKeyEntity.html#marshalPrimaryKey(com.sleepycat.bind.tuple.TupleOutput)">marshalPrimaryKey</A></B>(<A HREF="../../../../com/sleepycat/bind/tuple/TupleOutput.html" title="class in com.sleepycat.bind.tuple">TupleOutput</A> keyOutput)</CODE>
<BR>
Extracts the entity's primary key and writes it to the key output.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/bind/tuple/MarshalledTupleKeyEntity.html#marshalSecondaryKey(java.lang.String, com.sleepycat.bind.tuple.TupleOutput)">marshalSecondaryKey</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> keyName,
<A HREF="../../../../com/sleepycat/bind/tuple/TupleOutput.html" title="class in com.sleepycat.bind.tuple">TupleOutput</A> keyOutput)</CODE>
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Extracts the entity's secondary key and writes it to the key output.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/bind/tuple/MarshalledTupleKeyEntity.html#nullifyForeignKey(java.lang.String)">nullifyForeignKey</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> keyName)</CODE>
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Clears the entity's secondary key fields for the given key name.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/bind/tuple/MarshalledTupleKeyEntity.html#unmarshalPrimaryKey(com.sleepycat.bind.tuple.TupleInput)">unmarshalPrimaryKey</A></B>(<A HREF="../../../../com/sleepycat/bind/tuple/TupleInput.html" title="class in com.sleepycat.bind.tuple">TupleInput</A> keyInput)</CODE>
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Completes construction of the entity by setting its primary key from the
stored primary key.</TD>
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<A NAME="marshalPrimaryKey(com.sleepycat.bind.tuple.TupleOutput)"><!-- --></A><H3>
marshalPrimaryKey</H3>
<PRE>
public void <B>marshalPrimaryKey</B>(<A HREF="../../../../com/sleepycat/bind/tuple/TupleOutput.html" title="class in com.sleepycat.bind.tuple">TupleOutput</A> keyOutput)</PRE>
<DL>
<DD>Extracts the entity's primary key and writes it to the key output.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>keyOutput</CODE> - is the output tuple.</DL>
</DD>
</DL>
<HR>
<A NAME="unmarshalPrimaryKey(com.sleepycat.bind.tuple.TupleInput)"><!-- --></A><H3>
unmarshalPrimaryKey</H3>
<PRE>
public void <B>unmarshalPrimaryKey</B>(<A HREF="../../../../com/sleepycat/bind/tuple/TupleInput.html" title="class in com.sleepycat.bind.tuple">TupleInput</A> keyInput)</PRE>
<DL>
<DD>Completes construction of the entity by setting its primary key from the
stored primary key.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>keyInput</CODE> - is the input tuple.</DL>
</DD>
</DL>
<HR>
<A NAME="marshalSecondaryKey(java.lang.String, com.sleepycat.bind.tuple.TupleOutput)"><!-- --></A><H3>
marshalSecondaryKey</H3>
<PRE>
public boolean <B>marshalSecondaryKey</B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> keyName,
<A HREF="../../../../com/sleepycat/bind/tuple/TupleOutput.html" title="class in com.sleepycat.bind.tuple">TupleOutput</A> keyOutput)</PRE>
<DL>
<DD>Extracts the entity's secondary key and writes it to the key output.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>keyName</CODE> - identifies the secondary key.<DD><CODE>keyOutput</CODE> - is the output tuple.
<DT><B>Returns:</B><DD>true if a key was created, or false to indicate that the key is
not present.</DL>
</DD>
</DL>
<HR>
<A NAME="nullifyForeignKey(java.lang.String)"><!-- --></A><H3>
nullifyForeignKey</H3>
<PRE>
public boolean <B>nullifyForeignKey</B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> keyName)</PRE>
<DL>
<DD>Clears the entity's secondary key fields for the given key name.
<p>The specified index key should be changed by this method such that
<A HREF="../../../../com/sleepycat/bind/tuple/MarshalledTupleKeyEntity.html#marshalSecondaryKey(java.lang.String, com.sleepycat.bind.tuple.TupleOutput)"><CODE>marshalSecondaryKey(java.lang.String, com.sleepycat.bind.tuple.TupleOutput)</CODE></A> for the same key name will return false.
Other fields in the data object should remain unchanged.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>keyName</CODE> - identifies the secondary key.
<DT><B>Returns:</B><DD>true if the key was cleared, or false to indicate that the key
is not present and no change is necessary.</DL>
</DD>
</DL>
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