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ExpressionEvaluator (JoSQL 2.2 - SQL for Java Objects)
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org.josql.utils</FONT>
<BR>
Class ExpressionEvaluator</H2>
<PRE>
<A HREF="/usr/share/doc/default-jdk-doc/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>org.josql.utils.ExpressionEvaluator</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>ExpressionEvaluator</B><DT>extends <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
</PRE>
<P>
This class can be used as a convenient way of evaluating an expression
without having to use the Query object itself.
<p>
In this way you can easily evaluate JoSQL expressions against objects.
<p>
Usage:
<p>
Use the static methods to evaluate the expression in one call, for instance to
find out details about a file:
<p>
String exp = "path + ', size: ' + formatNumber(length) + ', last modified: ' + formatDate(lastModified)<br />
String details = ExpressionEvaluator.getValue (exp, new File ('/home/me/myfile.txt'));
<P>
<P>
<HR>
<P>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<A NAME="constructor_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<B>Constructor Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../org/josql/utils/ExpressionEvaluator.html#ExpressionEvaluator(java.lang.String, java.lang.Class)">ExpressionEvaluator</A></B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> exp,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A> cl)</CODE>
<BR>
Create a new expression evaluator.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../org/josql/utils/ExpressionEvaluator.html#ExpressionEvaluator(java.lang.String, java.lang.Class, java.util.List)">ExpressionEvaluator</A></B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> exp,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A> cl,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A> fhs)</CODE>
<BR>
Create a new expression evaluator.</TD>
</TR>
</TABLE>
<!-- ========== METHOD SUMMARY =========== -->
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<B>Method Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../org/josql/Query.html" title="class in org.josql">Query</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/josql/utils/ExpressionEvaluator.html#getQuery()">getQuery</A></B>()</CODE>
<BR>
Get the query associated with the expression, use this to setup
bind variables, function handlers and so on, which of course must
be setup prior to evaluating the expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="/usr/share/doc/default-jdk-doc/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/josql/utils/ExpressionEvaluator.html#getValue(java.lang.Object)">getValue</A></B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> o)</CODE>
<BR>
Evaluate the expression against the object passed in and return the
value.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="/usr/share/doc/default-jdk-doc/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/josql/utils/ExpressionEvaluator.html#getValue(java.lang.String, java.lang.Object)">getValue</A></B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> exp,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> o)</CODE>
<BR>
Evaluate the expression against the object passed in and return the
value.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="/usr/share/doc/default-jdk-doc/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/josql/utils/ExpressionEvaluator.html#getValues(java.util.List)">getValues</A></B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A> l)</CODE>
<BR>
Evaluate the expression against the list of objects passed in and
return the value.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="/usr/share/doc/default-jdk-doc/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/josql/utils/ExpressionEvaluator.html#getValues(java.lang.String, java.util.List)">getValues</A></B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> exp,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A> l)</CODE>
<BR>
Evaluate the expression against the list of objects passed in and
return the value.</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/josql/utils/ExpressionEvaluator.html#isTrue(java.lang.Object)">isTrue</A></B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> o)</CODE>
<BR>
Evaluate the expression against the object passed in.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/josql/utils/ExpressionEvaluator.html#isTrue(java.lang.String, java.lang.Object)">isTrue</A></B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> exp,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> o)</CODE>
<BR>
Evaluate the expression against the object passed in.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
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<TD><CODE><A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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<P>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="ExpressionEvaluator(java.lang.String, java.lang.Class)"><!-- --></A><H3>
ExpressionEvaluator</H3>
<PRE>
public <B>ExpressionEvaluator</B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> exp,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A> cl)
throws <A HREF="../../../org/josql/QueryParseException.html" title="class in org.josql">QueryParseException</A></PRE>
<DL>
<DD>Create a new expression evaluator.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>exp</CODE> - The expression to be evaluated.<DD><CODE>cl</CODE> - The class of the object(s) that the expression will be
evaluated against.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/josql/QueryParseException.html" title="class in org.josql">QueryParseException</A></CODE> - If the expression cannot be parsed.</DL>
</DL>
<HR>
<A NAME="ExpressionEvaluator(java.lang.String, java.lang.Class, java.util.List)"><!-- --></A><H3>
ExpressionEvaluator</H3>
<PRE>
public <B>ExpressionEvaluator</B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> exp,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A> cl,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A> fhs)
throws <A HREF="../../../org/josql/QueryParseException.html" title="class in org.josql">QueryParseException</A></PRE>
<DL>
<DD>Create a new expression evaluator.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>exp</CODE> - The expression to be evaluated.<DD><CODE>cl</CODE> - The class of the object(s) that the expression will be
evaluated against.<DD><CODE>fhs</CODE> - A list of function handlers that contain functions that will
be used by the expression, can be null.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/josql/QueryParseException.html" title="class in org.josql">QueryParseException</A></CODE> - If the expression cannot be parsed.</DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="getQuery()"><!-- --></A><H3>
getQuery</H3>
<PRE>
public <A HREF="../../../org/josql/Query.html" title="class in org.josql">Query</A> <B>getQuery</B>()</PRE>
<DL>
<DD>Get the query associated with the expression, use this to setup
bind variables, function handlers and so on, which of course must
be setup prior to evaluating the expression.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>The Query object.</DL>
</DD>
</DL>
<HR>
<A NAME="isTrue(java.lang.Object)"><!-- --></A><H3>
isTrue</H3>
<PRE>
public boolean <B>isTrue</B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> o)
throws <A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></PRE>
<DL>
<DD>Evaluate the expression against the object passed in.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>o</CODE> - The object to evaluate the expression against.
<DT><B>Returns:</B><DD>The value of calling Expression.isTrue (Query, Object).
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></CODE> - If the expression cannot be executed.</DL>
</DD>
</DL>
<HR>
<A NAME="getValues(java.util.List)"><!-- --></A><H3>
getValues</H3>
<PRE>
public <A HREF="/usr/share/doc/default-jdk-doc/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A> <B>getValues</B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A> l)
throws <A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></PRE>
<DL>
<DD>Evaluate the expression against the list of objects passed in and
return the value.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>l</CODE> - The list of objects to evaluate the expression against.
<DT><B>Returns:</B><DD>The values gained when evaluating the expression against all
the objects in the list.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></CODE> - If the expression cannot be executed.</DL>
</DD>
</DL>
<HR>
<A NAME="getValue(java.lang.Object)"><!-- --></A><H3>
getValue</H3>
<PRE>
public <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>getValue</B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> o)
throws <A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></PRE>
<DL>
<DD>Evaluate the expression against the object passed in and return the
value.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>o</CODE> - The object to evaluate the expression against.
<DT><B>Returns:</B><DD>The value gained when evaluating the expression against
the object.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></CODE> - If the expression cannot be executed.</DL>
</DD>
</DL>
<HR>
<A NAME="isTrue(java.lang.String, java.lang.Object)"><!-- --></A><H3>
isTrue</H3>
<PRE>
public static boolean <B>isTrue</B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> exp,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> o)
throws <A HREF="../../../org/josql/QueryParseException.html" title="class in org.josql">QueryParseException</A>,
<A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></PRE>
<DL>
<DD>Evaluate the expression against the object passed in.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>exp</CODE> - A string representation of the expression to evaluate.<DD><CODE>o</CODE> - The object to evaluate the expression against.
<DT><B>Returns:</B><DD>The value of calling Expression.isTrue (Query, Object).
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/josql/QueryParseException.html" title="class in org.josql">QueryParseException</A></CODE> - If the expression cannot be parsed.
<DD><CODE><A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></CODE> - If the expression cannot be executed.</DL>
</DD>
</DL>
<HR>
<A NAME="getValues(java.lang.String, java.util.List)"><!-- --></A><H3>
getValues</H3>
<PRE>
public static <A HREF="/usr/share/doc/default-jdk-doc/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A> <B>getValues</B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> exp,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A> l)
throws <A HREF="../../../org/josql/QueryParseException.html" title="class in org.josql">QueryParseException</A>,
<A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></PRE>
<DL>
<DD>Evaluate the expression against the list of objects passed in and
return the value.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>exp</CODE> - A string representation of the expression to evaluate.<DD><CODE>l</CODE> - The list of objects to evaluate the expression against.
<DT><B>Returns:</B><DD>The values gained when evaluating the expression against all
the objects in the list.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/josql/QueryParseException.html" title="class in org.josql">QueryParseException</A></CODE> - If the expression cannot be parsed.
<DD><CODE><A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></CODE> - If the expression cannot be executed.</DL>
</DD>
</DL>
<HR>
<A NAME="getValue(java.lang.String, java.lang.Object)"><!-- --></A><H3>
getValue</H3>
<PRE>
public static <A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>getValue</B>(<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> exp,
<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> o)
throws <A HREF="../../../org/josql/QueryParseException.html" title="class in org.josql">QueryParseException</A>,
<A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></PRE>
<DL>
<DD>Evaluate the expression against the object passed in and return the
value.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>exp</CODE> - A string representation of the expression to evaluate.<DD><CODE>o</CODE> - The object to evaluate the expression against.
<DT><B>Returns:</B><DD>The value gained when evaluating the expression against
the object.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/josql/QueryParseException.html" title="class in org.josql">QueryParseException</A></CODE> - If the expression cannot be parsed.
<DD><CODE><A HREF="../../../org/josql/QueryExecutionException.html" title="class in org.josql">QueryExecutionException</A></CODE> - If the expression cannot be executed.</DL>
</DD>
</DL>
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