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AggregateListener (OpenJPA 1.0.1 API) | |
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<FONT SIZE="-1"> | |
org.apache.openjpa.kernel.exps</FONT> | |
<BR> | |
Interface AggregateListener</H2> | |
<DL> | |
<DT><B>All Superinterfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/io/Serializable.html" title="class or interface in java.io">Serializable</A></DD> | |
</DL> | |
<DL> | |
<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../../../org/apache/openjpa/jdbc/kernel/exps/JDBCAggregateListener.html" title="interface in org.apache.openjpa.jdbc.kernel.exps">JDBCAggregateListener</A></DD> | |
</DL> | |
<HR> | |
<DL> | |
<DT><PRE>public interface <B>AggregateListener</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/io/Serializable.html" title="class or interface in java.io">Serializable</A></DL> | |
</PRE> | |
<P> | |
An aggregate listener aggregates data produced by an ExpressionQuery. | |
<P> | |
<P> | |
<DL> | |
<DT><B>Author:</B></DT> | |
<DD>Abe White, Patrick Linskey</DD> | |
</DL> | |
<HR> | |
<P> | |
<!-- ========== METHOD SUMMARY =========== --> | |
<A NAME="method_summary"><!-- --></A> | |
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> | |
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> | |
<B>Method Summary</B></FONT></TH> | |
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<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/kernel/exps/AggregateListener.html#evaluate(java.util.Collection, java.lang.Class[], java.util.Collection, org.apache.openjpa.kernel.StoreContext)">evaluate</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> args, | |
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A>[] argClasses, | |
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> candidates, | |
<A HREF="../../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</A> ctx)</CODE> | |
<BR> | |
Return the value of this aggregate.</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="../../../../../org/apache/openjpa/kernel/exps/AggregateListener.html#expectsArguments()">expectsArguments</A></B>()</CODE> | |
<BR> | |
Return whether this function expects to act on arguments.</TD> | |
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<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A></CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/kernel/exps/AggregateListener.html#getTag()">getTag</A></B>()</CODE> | |
<BR> | |
Return the tag that this listener listens for.</TD> | |
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<TR BGCOLOR="white" CLASS="TableRowColor"> | |
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A></CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/kernel/exps/AggregateListener.html#getType(java.lang.Class[])">getType</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A>[] argClasses)</CODE> | |
<BR> | |
Return the expected type of the result of this listener.</TD> | |
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<A NAME="getTag()"><!-- --></A><H3> | |
getTag</H3> | |
<PRE> | |
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>getTag</B>()</PRE> | |
<DL> | |
<DD>Return the tag that this listener listens for. | |
<P> | |
<DD><DL> | |
</DL> | |
</DD> | |
<DD><DL> | |
</DL> | |
</DD> | |
</DL> | |
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<A NAME="expectsArguments()"><!-- --></A><H3> | |
expectsArguments</H3> | |
<PRE> | |
boolean <B>expectsArguments</B>()</PRE> | |
<DL> | |
<DD>Return whether this function expects to act on arguments. Some | |
function may not need arguments; for example, a function to count the | |
number of objects that match a given filter might be of the form: | |
<code>count()</code>. | |
<P> | |
<DD><DL> | |
</DL> | |
</DD> | |
<DD><DL> | |
</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="evaluate(java.util.Collection, java.lang.Class[], java.util.Collection, org.apache.openjpa.kernel.StoreContext)"><!-- --></A><H3> | |
evaluate</H3> | |
<PRE> | |
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <B>evaluate</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> args, | |
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A>[] argClasses, | |
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> candidates, | |
<A HREF="../../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</A> ctx)</PRE> | |
<DL> | |
<DD>Return the value of this aggregate. | |
<P> | |
<DD><DL> | |
</DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Parameters:</B><DD><CODE>args</CODE> - for each candidate, the value of the arguments to | |
the function; will be null if this aggregate does | |
not expect an argument; if this function has | |
multiple arguments, each element will be an array<DD><CODE>argClasses</CODE> - the expected class of each argument element<DD><CODE>candidates</CODE> - the candidate objects being evaluated<DD><CODE>ctx</CODE> - the persistence context | |
<DT><B>Returns:</B><DD>the value of the aggregate | |
<DT><B>Throws:</B> | |
<DD><CODE><A HREF="../../../../../org/apache/openjpa/util/UserException.html" title="class in org.apache.openjpa.util">UserException</A></CODE> - if this aggregate does not | |
support in-memory operation</DL> | |
</DD> | |
</DL> | |
<HR> | |
<A NAME="getType(java.lang.Class[])"><!-- --></A><H3> | |
getType</H3> | |
<PRE> | |
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A> <B>getType</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A>[] argClasses)</PRE> | |
<DL> | |
<DD>Return the expected type of the result of this listener. | |
<P> | |
<DD><DL> | |
</DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Parameters:</B><DD><CODE>argClasses</CODE> - the expected classes of the argument, or null if | |
no arguments</DL> | |
</DD> | |
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