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AggregateListener (OpenJPA Parent POM 2.4.0 API)
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org.apache.openjpa.kernel.exps</FONT>
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Interface AggregateListener</H2>
<DL>
<DT><B>All Superinterfaces:</B> <DD><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" 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://download.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" 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>
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<B>Method Summary</B></FONT></TH>
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<CODE>&nbsp;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" 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://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A>&nbsp;args,
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>[]&nbsp;argClasses,
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<A HREF="../../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</A>&nbsp;ctx)</CODE>
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the value of this aggregate.</TD>
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<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/kernel/exps/AggregateListener.html#expectsArguments()">expectsArguments</A></B>()</CODE>
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return whether this function expects to act on arguments.</TD>
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<CODE>&nbsp;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" 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>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the tag that this listener listens for.</TD>
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<CODE>&nbsp;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" 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://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>[]&nbsp;argClasses)</CODE>
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the expected type of the result of this listener.</TD>
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<A NAME="getTag()"><!-- --></A><H3>
getTag</H3>
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<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>getTag</B>()</PRE>
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<DD>Return the tag that this listener listens for.
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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>.
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<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://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>evaluate</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A>&nbsp;args,
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>[]&nbsp;argClasses,
<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A>&nbsp;candidates,
<A HREF="../../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</A>&nbsp;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>
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getType</H3>
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<DL>
<DD>Return the expected type of the result of this listener.
<P>
<DD><DL>
</DL>
</DD>
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<DT><B>Parameters:</B><DD><CODE>argClasses</CODE> - the expected classes of the argument, or null if
no arguments</DL>
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