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ClassEnhancer (Oracle - Berkeley DB Java API)
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com.sleepycat.persist.model</FONT>
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Class ClassEnhancer</H2>
<PRE>
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.sleepycat.persist.model.ClassEnhancer</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/instrument/ClassFileTransformer.html?is-external=true" title="class or interface in java.lang.instrument">ClassFileTransformer</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>ClassEnhancer</B><DT>extends <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/instrument/ClassFileTransformer.html?is-external=true" title="class or interface in java.lang.instrument">ClassFileTransformer</A></DL>
</PRE>
<P>
Enhances the bytecode of persistent classes to provide efficient access to
fields and constructors, and to avoid special security policy settings for
accessing non-public members. Classes are enhanced if they are annotated
with <A HREF="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><CODE>Entity</CODE></A> or <A HREF="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><CODE>Persistent</CODE></A>.
<p><code>ClassEnhancer</code> objects are thread-safe. Multiple threads may
safely call the methods of a shared <code>ClassEnhancer</code> object.</p>
<p>As described in the <a
href="../package-summary.html#bytecode">package summary</a>, bytecode
enhancement may be used either at runtime or offline (at build time).</p>
<p>To use enhancement offline, this class may be used as a <A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#main(java.lang.String[])"><CODE>main
program</CODE></A>.
</p>
<p>For enhancement at runtime, this class provides the low level support
needed to transform class bytes during class loading. To configure runtime
enhancement you may use one of the following approaches:</p>
<ol>
<li>The BDB <code>je-<version>.jar</code> or <code>db.jar</code> file may be used as
an instrumentation agent as follows:
<pre class="code">java -javaagent:<BDB-JAR-FILE>=enhance:packageNames ...</pre>
<code>packageNames</code> is a comma separated list of packages containing
persistent classes. Sub-packages of these packages are also searched. If
<code>packageNames</code> is omitted then all packages known to the current
classloader are searched.
<p>The "-v" option may be included in the comma separated list to print the
name of each class that is enhanced.</p></li>
<br>
<li>The <A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#enhance(java.lang.String, byte[])"><CODE>enhance(java.lang.String, byte[])</CODE></A> method may be called to implement a class loader
that performs enhancement. Using this approach, it is the developer's
responsibility to implement and configure the class loader.</li>
</ol>
<P>
<P>
<HR>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#ClassEnhancer()">ClassEnhancer</A></B>()</CODE>
<BR>
Creates a class enhancer that searches all packages.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#ClassEnhancer(java.util.Set)">ClassEnhancer</A></B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A><<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>> packageNames)</CODE>
<BR>
Creates a class enhancer that searches a given set of packages.</TD>
</TR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#enhance(java.lang.String, byte[])">enhance</A></B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> className,
byte[] classBytes)</CODE>
<BR>
Enhances the given class bytes if the class is annotated with <A HREF="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><CODE>Entity</CODE></A> or <A HREF="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><CODE>Persistent</CODE></A>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#getVerbose()">getVerbose</A></B>()</CODE>
<BR>
Gets verbose mode.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#main(java.lang.String[])">main</A></B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[] args)</CODE>
<BR>
Enhances classes in the directories specified.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#premain(java.lang.String, java.lang.instrument.Instrumentation)">premain</A></B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> args,
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/instrument/Instrumentation.html?is-external=true" title="class or interface in java.lang.instrument">Instrumentation</A> inst)</CODE>
<BR>
Enhances classes as specified by a JVM -javaagent argument.</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/persist/model/ClassEnhancer.html#setVerbose(boolean)">setVerbose</A></B>(boolean verbose)</CODE>
<BR>
Sets verbose mode.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#transform(java.lang.ClassLoader, java.lang.String, java.lang.Class, java.security.ProtectionDomain, byte[])">transform</A></B>(<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> loader,
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> className,
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><?> classBeingRedefined,
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/security/ProtectionDomain.html?is-external=true" title="class or interface in java.security">ProtectionDomain</A> protectionDomain,
byte[] classfileBuffer)</CODE>
<BR>
</TD>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
</TR>
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<P>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<B>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="ClassEnhancer()"><!-- --></A><H3>
ClassEnhancer</H3>
<PRE>
public <B>ClassEnhancer</B>()</PRE>
<DL>
<DD>Creates a class enhancer that searches all packages.
<P>
</DL>
<HR>
<A NAME="ClassEnhancer(java.util.Set)"><!-- --></A><H3>
ClassEnhancer</H3>
<PRE>
public <B>ClassEnhancer</B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A><<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>> packageNames)</PRE>
<DL>
<DD>Creates a class enhancer that searches a given set of packages.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>packageNames</CODE> - a set of packages to search for persistent
classes. Sub-packages of these packages are also searched. If empty or
null, all packages known to the current classloader are searched.</DL>
</DL>
<!-- ============ 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="main(java.lang.String[])"><!-- --></A><H3>
main</H3>
<PRE>
public static void <B>main</B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[] args)
throws <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></PRE>
<DL>
<DD>Enhances classes in the directories specified. The class files are
replaced when they are enhanced, without changing the file modification
date. For example:
<pre class="code">java -cp je-<version>.jar com.sleepycat.persist.model.ClassEnhancer ./classes</pre>
<p>The "-v" argument may be specified to print the name of each class
file that is enhanced. The total number of class files enhanced will
always be printed.</p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>args</CODE> - one or more directories containing classes to be enhanced.
Subdirectories of these directories will also be searched. Optionally,
-v may be included to print the name of every class file enhanced.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="premain(java.lang.String, java.lang.instrument.Instrumentation)"><!-- --></A><H3>
premain</H3>
<PRE>
public static void <B>premain</B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> args,
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/instrument/Instrumentation.html?is-external=true" title="class or interface in java.lang.instrument">Instrumentation</A> inst)</PRE>
<DL>
<DD>Enhances classes as specified by a JVM -javaagent argument.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/instrument/Instrumentation.html?is-external=true" title="class or interface in java.lang.instrument"><CODE>Instrumentation</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="setVerbose(boolean)"><!-- --></A><H3>
setVerbose</H3>
<PRE>
public void <B>setVerbose</B>(boolean verbose)</PRE>
<DL>
<DD>Sets verbose mode.
<p>True may be specified to print the name of each class file that is
enhanced. This property is false by default.</p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getVerbose()"><!-- --></A><H3>
getVerbose</H3>
<PRE>
public boolean <B>getVerbose</B>()</PRE>
<DL>
<DD>Gets verbose mode.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="../../../../com/sleepycat/persist/model/ClassEnhancer.html#setVerbose(boolean)"><CODE>setVerbose(boolean)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="transform(java.lang.ClassLoader, java.lang.String, java.lang.Class, java.security.ProtectionDomain, byte[])"><!-- --></A><H3>
transform</H3>
<PRE>
public byte[] <B>transform</B>(<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> loader,
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> className,
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A><?> classBeingRedefined,
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/security/ProtectionDomain.html?is-external=true" title="class or interface in java.security">ProtectionDomain</A> protectionDomain,
byte[] classfileBuffer)</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/instrument/ClassFileTransformer.html?is-external=true#transform(java.lang.ClassLoader, java.lang.String, java.lang.Class, java.security.ProtectionDomain, byte[])" title="class or interface in java.lang.instrument">transform</A></CODE> in interface <CODE><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/instrument/ClassFileTransformer.html?is-external=true" title="class or interface in java.lang.instrument">ClassFileTransformer</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="enhance(java.lang.String, byte[])"><!-- --></A><H3>
enhance</H3>
<PRE>
public byte[] <B>enhance</B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> className,
byte[] classBytes)</PRE>
<DL>
<DD>Enhances the given class bytes if the class is annotated with <A HREF="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><CODE>Entity</CODE></A> or <A HREF="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><CODE>Persistent</CODE></A>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>className</CODE> - the class name in binary format; for example,
"my.package.MyClass$Name", or null if no filtering by class name
should be performed.<DD><CODE>classBytes</CODE> - are the class file bytes to be enhanced.
<DT><B>Returns:</B><DD>the enhanced bytes, or null if no enhancement was performed.</DL>
</DD>
</DL>
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<b>Berkeley DB</b><br><font size="-1"> version 5.3.28</font></EM>
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