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| org.apache.openjpa.kernel.exps</FONT> |
| <BR> |
| Interface FilterListener</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/JDBCFilterListener.html" title="interface in org.apache.openjpa.jdbc.kernel.exps">JDBCFilterListener</A></DD> |
| </DL> |
| <DL> |
| <DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../org/apache/openjpa/jdbc/kernel/exps/GetColumn.html" title="class in org.apache.openjpa.jdbc.kernel.exps">GetColumn</A>, <A HREF="../../../../../org/apache/openjpa/jdbc/kernel/exps/JDBCStringContains.html" title="class in org.apache.openjpa.jdbc.kernel.exps">JDBCStringContains</A>, <A HREF="../../../../../org/apache/openjpa/jdbc/kernel/exps/JDBCWildcardMatch.html" title="class in org.apache.openjpa.jdbc.kernel.exps">JDBCWildcardMatch</A>, <A HREF="../../../../../org/apache/openjpa/jdbc/kernel/exps/SQLEmbed.html" title="class in org.apache.openjpa.jdbc.kernel.exps">SQLEmbed</A>, <A HREF="../../../../../org/apache/openjpa/jdbc/kernel/exps/SQLExpression.html" title="class in org.apache.openjpa.jdbc.kernel.exps">SQLExpression</A>, <A HREF="../../../../../org/apache/openjpa/jdbc/kernel/exps/SQLValue.html" title="class in org.apache.openjpa.jdbc.kernel.exps">SQLValue</A>, <A HREF="../../../../../org/apache/openjpa/kernel/exps/StringContains.html" title="class in org.apache.openjpa.kernel.exps">StringContains</A>, <A HREF="../../../../../org/apache/openjpa/kernel/exps/WildcardMatch.html" title="class in org.apache.openjpa.kernel.exps">WildcardMatch</A></DD> |
| </DL> |
| <HR> |
| <DL> |
| <DT><PRE>public interface <B>FilterListener</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> |
| A filter listener extends expression filters with custom functionality. |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>Author:</B></DT> |
| <DD>Steve Kim, Abe White</DD> |
| </DL> |
| <HR> |
| |
| <P> |
| |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <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/FilterListener.html#evaluate(java.lang.Object, java.lang.Class, java.lang.Object[], java.lang.Class[], java.lang.Object, org.apache.openjpa.kernel.StoreContext)">evaluate</A></B>(<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> target, |
| <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> targetClass, |
| <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>[] 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/lang/Object.html" title="class or interface in java.lang">Object</A> candidate, |
| <A HREF="../../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</A> ctx)</CODE> |
| |
| <BR> |
| Evaluate the given expression.</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/FilterListener.html#expectsArguments()">expectsArguments</A></B>()</CODE> |
| |
| <BR> |
| Return true if this extension expects arguments to act on.</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/FilterListener.html#expectsTarget()">expectsTarget</A></B>()</CODE> |
| |
| <BR> |
| Return true if this extension expects a target to act on.</TD> |
| </TR> |
| <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/FilterListener.html#getTag()">getTag</A></B>()</CODE> |
| |
| <BR> |
| Return the tag that this extension listens for.</TD> |
| </TR> |
| <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/FilterListener.html#getType(java.lang.Class, 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> targetClass, |
| <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> |
| </TR> |
| </TABLE> |
| |
| <P> |
| |
| <!-- ============ METHOD DETAIL ========== --> |
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| <A NAME="method_detail"><!-- --></A> |
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| <B>Method Detail</B></FONT></TH> |
| </TR> |
| </TABLE> |
| |
| <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 extension listens for. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="expectsArguments()"><!-- --></A><H3> |
| expectsArguments</H3> |
| <PRE> |
| boolean <B>expectsArguments</B>()</PRE> |
| <DL> |
| <DD>Return true if this extension expects arguments to act on. Some |
| extensions may not need arguments; for example, an extension to |
| switch a string to upper case might be of the form: |
| <code>field.ext:toUpperCase ()</code>. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="expectsTarget()"><!-- --></A><H3> |
| expectsTarget</H3> |
| <PRE> |
| boolean <B>expectsTarget</B>()</PRE> |
| <DL> |
| <DD>Return true if this extension expects a target to act on. Some |
| extensions act on a field or object value; others stand alone. |
| <code>field.ext:toUpperCase ()</code> acts on the target |
| <code>field</code> but has no arguments, while another possible form, |
| <code>ext:toUpperCase (field)</code> has no target but does have an |
| argument. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="evaluate(java.lang.Object, java.lang.Class, java.lang.Object[], java.lang.Class[], java.lang.Object, 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/lang/Object.html" title="class or interface in java.lang">Object</A> target, |
| <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> targetClass, |
| <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>[] 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/lang/Object.html" title="class or interface in java.lang">Object</A> candidate, |
| <A HREF="../../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</A> ctx)</PRE> |
| <DL> |
| <DD>Evaluate the given expression. This method is used when |
| evaluating in-memory expressions. The method used when evaluating |
| data store expressions will change depending on the data store in use. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>target</CODE> - the target object / field value to act on; will be |
| null if this extension does not expect a target<DD><CODE>targetClass</CODE> - the expected class of the target; given in case |
| the target evaluates to null and typing is needed<DD><CODE>args</CODE> - the values of the arguments given in the filter; |
| will be null if this extension does not expect an argument<DD><CODE>argClasses</CODE> - the expected classes of the arguments; given in case |
| an argument evaluates to null and typing is needed<DD><CODE>candidate</CODE> - the candidate object being evaluated<DD><CODE>ctx</CODE> - the persistence context |
| <DT><B>Returns:</B><DD>the value of the extension for this candidate; if |
| this extension is an expression, this method should |
| return <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Boolean.html#TRUE" title="class or interface in java.lang"><CODE>Boolean.TRUE</CODE></A> or <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Boolean.html#FALSE" title="class or interface in java.lang"><CODE>Boolean.FALSE</CODE></A> |
| <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 extension does not |
| support in-memory operation</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="getType(java.lang.Class, 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> targetClass, |
| <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>targetClass</CODE> - the expected class of the target, or null if no target<DD><CODE>argClasses</CODE> - the expected classes of the arguments, or null if |
| no arguments</DL> |
| </DD> |
| </DL> |
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