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ConstructorInterceptor
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SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD>
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org.aopalliance.intercept</FONT>
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Interface ConstructorInterceptor</H2>
<DL>
<DT><B>All Superinterfaces:</B> <DD><A HREF="../../../org/aopalliance/aop/Advice.html" title="interface in org.aopalliance.aop">Advice</A>, <A HREF="../../../org/aopalliance/intercept/Interceptor.html" title="interface in org.aopalliance.intercept">Interceptor</A></DD>
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<DT><PRE>public interface <B>ConstructorInterceptor</B><DT>extends <A HREF="../../../org/aopalliance/intercept/Interceptor.html" title="interface in org.aopalliance.intercept">Interceptor</A></DL>
</PRE>
<P>
Intercepts the construction of a new object.
<p>The user should implement the <A HREF="../../../org/aopalliance/intercept/ConstructorInterceptor.html#construct(org.aopalliance.intercept.ConstructorInvocation)"><CODE>construct(ConstructorInvocation)</CODE></A> method to modify the original
behavior. E.g. the following class implements a singleton
interceptor (allows only one unique instance for the intercepted
class):
<pre class=code>
class DebuggingInterceptor implements ConstructorInterceptor {
Object instance=null;
Object construct(ConstructorInvocation i) throws Throwable {
if(instance==null) {
return instance=i.proceed();
} else {
throw new Exception("singleton does not allow multiple instance");
}
}
}
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<B>Method Summary</B></FONT></TH>
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<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/aopalliance/intercept/ConstructorInterceptor.html#construct(org.aopalliance.intercept.ConstructorInvocation)">construct</A></B>(<A HREF="../../../org/aopalliance/intercept/ConstructorInvocation.html" title="interface in org.aopalliance.intercept">ConstructorInvocation</A> invocation)</CODE>
<BR>
Implement this method to perform extra treatments before and
after the consrution of a new object.</TD>
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<A NAME="construct(org.aopalliance.intercept.ConstructorInvocation)"><!-- --></A><H3>
construct</H3>
<PRE>
java.lang.Object <B>construct</B>(<A HREF="../../../org/aopalliance/intercept/ConstructorInvocation.html" title="interface in org.aopalliance.intercept">ConstructorInvocation</A> invocation)
throws java.lang.Throwable</PRE>
<DL>
<DD>Implement this method to perform extra treatments before and
after the consrution of a new object. Polite implementations
would certainly like to invoke <A HREF="../../../org/aopalliance/intercept/Joinpoint.html#proceed()"><CODE>Joinpoint.proceed()</CODE></A>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>invocation</CODE> - the construction joinpoint
<DT><B>Returns:</B><DD>the newly created object, which is also the result of
the call to <A HREF="../../../org/aopalliance/intercept/Joinpoint.html#proceed()"><CODE>Joinpoint.proceed()</CODE></A>, might be replaced by
the interceptor.
<DT><B>Throws:</B>
<DD><CODE>java.lang.Throwable</CODE> - if the interceptors or the
target-object throws an exception.</DL>
</DD>
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