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ClassCatalog (Oracle - Berkeley DB Java API)
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com.sleepycat.bind.serial
 
Interface ClassCatalog</H2>
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<DT>All Known Implementing Classes: <DD><A HREF="../../../../com/sleepycat/bind/serial/StoredClassCatalog.html" title="class in com.sleepycat.bind.serial">StoredClassCatalog</A></DD>
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<DT><PRE>public interface ClassCatalog</DL>
</PRE>

A catalog of class description information for use during object
 serialization.

A catalog is used to store class descriptions separately from serialized
 objects, to avoid redundantly stored information with each object.
 When serialized objects are stored in a database, a <A HREF="../../../../com/sleepycat/bind/serial/StoredClassCatalog.html" title="class in com.sleepycat.bind.serial"><CODE>StoredClassCatalog</CODE></A> should be used.

This information is used for serialization of class descriptors or
 java.io.ObjectStreamClass objects, each of which represents a unique class
 format. For each unique format, a unique class ID is assigned by the
 catalog. The class ID can then be used in the serialization stream in place
 of the full class information. When used with <A HREF="../../../../com/sleepycat/bind/serial/SerialInput.html" title="class in com.sleepycat.bind.serial"><CODE>SerialInput</CODE></A> and
 <A HREF="../../../../com/sleepycat/bind/serial/SerialOutput.html" title="class in com.sleepycat.bind.serial"><CODE>SerialOutput</CODE></A> or any of the serial bindings, the use of the catalog
 is transparent to the application.

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<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../../com/sleepycat/bind/serial/ClassCatalog.html#close()">close</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Close a catalog database and release any cached resources.</TD>
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<CODE>&nbsp;<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/io/ObjectStreamClass.html" title="class or interface in java.io">ObjectStreamClass</A></CODE></TD>
<TD><CODE><A HREF="../../../../com/sleepycat/bind/serial/ClassCatalog.html#getClassFormat(byte[])">getClassFormat</A>(byte[]&nbsp;classID)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the ObjectStreamClass for the given class ID.</TD>
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<CODE>&nbsp;byte[]</CODE></TD>
<TD><CODE><A HREF="../../../../com/sleepycat/bind/serial/ClassCatalog.html#getClassID(java.io.ObjectStreamClass)">getClassID</A>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/io/ObjectStreamClass.html" title="class or interface in java.io">ObjectStreamClass</A>&nbsp;classDesc)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the class ID for the current version of the given class
 description.</TD>
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<A NAME="close()"></A><H3>
close</H3>
<PRE>
void close()
 throws <A HREF="../../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Close a catalog database and release any cached resources.

<DD><DL>

<DT>Throws:
<DD><CODE><A HREF="../../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE></DL>
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<A NAME="getClassID(java.io.ObjectStreamClass)"></A><H3>
getClassID</H3>
<PRE>
byte[] getClassID(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/io/ObjectStreamClass.html" title="class or interface in java.io">ObjectStreamClass</A>&nbsp;classDesc)
 throws <A HREF="../../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A>,
 <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/ClassNotFoundException.html" title="class or interface in java.lang">ClassNotFoundException</A></PRE>
<DL>
<DD>Return the class ID for the current version of the given class
 description.
 This is used for storing in serialization streams in place of a full
 class descriptor, since it is much more compact. To get back the
 ObjectStreamClass for a class ID, call <A HREF="../../../../com/sleepycat/bind/serial/ClassCatalog.html#getClassFormat(byte[])"><CODE>getClassFormat(byte[])</CODE></A>.
 This function causes a new class ID to be assigned if the class
 description has changed.

<DD><DL>
<DT>Parameters:<DD><CODE>classDesc</CODE> - The class description for which to return the
 class ID.
<DT>Returns:<DD>The class ID for the current version of the class.
<DT>Throws:
<DD><CODE><A HREF="../../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/ClassNotFoundException.html" title="class or interface in java.lang">ClassNotFoundException</A></CODE></DL>
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<A NAME="getClassFormat(byte[])"></A><H3>
getClassFormat</H3>
<PRE>
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/io/ObjectStreamClass.html" title="class or interface in java.io">ObjectStreamClass</A> getClassFormat(byte[]&nbsp;classID)
 throws <A HREF="../../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A>,
 <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/ClassNotFoundException.html" title="class or interface in java.lang">ClassNotFoundException</A></PRE>
<DL>
<DD>Return the ObjectStreamClass for the given class ID. This may or may
 not be the current class format, depending on whether the class has
 changed since the class ID was generated.

<DD><DL>
<DT>Parameters:<DD><CODE>classID</CODE> - The class ID for which to return the class format.
<DT>Returns:<DD>The class format for the given class ID, which may or may not
 represent the current version of the class.
<DT>Throws:
<DD><CODE><A HREF="../../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/ClassNotFoundException.html" title="class or interface in java.lang">ClassNotFoundException</A></CODE></DL>
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