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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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ClassCatalog (Oracle - Berkeley DB Java API)
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<b>Berkeley DB</b><br><font size="-1"> version 5.3.28</font></EM>
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com.sleepycat.bind.serial</FONT>
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Interface ClassCatalog</H2>
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<DT><B>All Known Implementing Classes:</B> <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 <B>ClassCatalog</B></DL>
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<P>
A catalog of class description information for use during object
serialization.
<p>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.</p>
<p>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.</p>
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<DT><B>See Also:</B><DD><a href="SerialBinding.html#evolution">Class Evolution</a></DL>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/bind/serial/ClassCatalog.html#close()">close</A></B>()</CODE>
<BR>
Close a catalog database and release any cached resources.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/io/ObjectStreamClass.html?is-external=true" title="class or interface in java.io">ObjectStreamClass</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/bind/serial/ClassCatalog.html#getClassFormat(byte[])">getClassFormat</A></B>(byte[] classID)</CODE>
<BR>
Return the ObjectStreamClass for the given class ID.</TD>
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<CODE> byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/bind/serial/ClassCatalog.html#getClassID(java.io.ObjectStreamClass)">getClassID</A></B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/io/ObjectStreamClass.html?is-external=true" title="class or interface in java.io">ObjectStreamClass</A> classDesc)</CODE>
<BR>
Return the class ID for the current version of the given class
description.</TD>
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<CODE> <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/ClassLoader.html?is-external=true" title="class or interface in java.lang">ClassLoader</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/bind/serial/ClassCatalog.html#getClassLoader()">getClassLoader</A></B>()</CODE>
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Returns the ClassLoader to be used by bindings that use this catalog.</TD>
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<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
void <B>close</B>()
throws <A HREF="../../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
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<DD>Close a catalog database and release any cached resources.
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<DT><B>Throws:</B>
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<A NAME="getClassID(java.io.ObjectStreamClass)"><!-- --></A><H3>
getClassID</H3>
<PRE>
byte[] <B>getClassID</B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/io/ObjectStreamClass.html?is-external=true" title="class or interface in java.io">ObjectStreamClass</A> classDesc)
throws <A HREF="../../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A>,
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/ClassNotFoundException.html?is-external=true" 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.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>classDesc</CODE> - The class description for which to return the
class ID.
<DT><B>Returns:</B><DD>The class ID for the current version of the class.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE>
<DD><CODE><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</A></CODE></DL>
</DD>
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<A NAME="getClassFormat(byte[])"><!-- --></A><H3>
getClassFormat</H3>
<PRE>
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/io/ObjectStreamClass.html?is-external=true" title="class or interface in java.io">ObjectStreamClass</A> <B>getClassFormat</B>(byte[] classID)
throws <A HREF="../../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A>,
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/ClassNotFoundException.html?is-external=true" 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.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>classID</CODE> - The class ID for which to return the class format.
<DT><B>Returns:</B><DD>The class format for the given class ID, which may or may not
represent the current version of the class.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE>
<DD><CODE><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</A></CODE></DL>
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<A NAME="getClassLoader()"><!-- --></A><H3>
getClassLoader</H3>
<PRE>
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/ClassLoader.html?is-external=true" title="class or interface in java.lang">ClassLoader</A> <B>getClassLoader</B>()</PRE>
<DL>
<DD>Returns the ClassLoader to be used by bindings that use this catalog.
The ClassLoader is used by <A HREF="../../../../com/sleepycat/bind/serial/SerialBinding.html" title="class in com.sleepycat.bind.serial"><CODE>SerialBinding</CODE></A> to load classes whose
description is stored in the catalog.
<p>In BDB JE, the implementation of this method in <A HREF="../../../../com/sleepycat/bind/serial/StoredClassCatalog.html" title="class in com.sleepycat.bind.serial"><CODE>StoredClassCatalog</CODE></A> returns the ClassLoader property of the catalog
database Environment. This ensures that the Environment's ClassLoader
property is used for loading all user-supplied classes.</p>
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<b>Berkeley DB</b><br><font size="-1"> version 5.3.28</font></EM>
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