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ViewRenderTool (VelocityTools 1.4 Documentation)
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org.apache.velocity.tools.view.tools</FONT>
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Class ViewRenderTool</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html" title="class in org.apache.velocity.tools.generic">org.apache.velocity.tools.generic.RenderTool</A>
<IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.velocity.tools.view.tools.ViewRenderTool</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>ViewRenderTool</B><DT>extends <A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html" title="class in org.apache.velocity.tools.generic">RenderTool</A></DL>
</PRE>
<P>
This tool expose methods to evaluate the given
strings as VTL (Velocity Template Language)
and automatically using the current context.
<br />
<pre>
Example of eval():
Input
-----
#set( $list = [1,2,3] )
#set( $object = '$list' )
#set( $method = 'size()' )
$render.eval("${object}.$method")
Output
------
3
Example of recurse():
Input
-----
#macro( say_hi )hello world!#end
#set( $foo = '#say_hi()' )
#set( $bar = '$foo' )
$render.recurse('$bar')
Output
------
hello world!
Toolbox configuration:
&lt;tool&gt;
&lt;key&gt;render&lt;/key&gt;
&lt;scope&gt;request&lt;/scope&gt;
&lt;class&gt;org.apache.velocity.tools.view.tools.ViewRenderTool&lt;/class&gt;
&lt;parameter name="parse.depth" value="10"/&gt;
&lt;/tool&gt;
</pre>
<p>Ok, so these examples are really lame. But, it seems like
someone out there is always asking how to do stuff like this
and we always tell them to write a tool. Now we can just tell
them to use this tool.</p>
<p>This tool is NOT meant to be used in either application or
session scopes of a servlet environment.</p>
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>$Revision: 479724 $ $Date: 2006-11-27 10:49:37 -0800 (Mon, 27 Nov 2006) $</DD>
<DT><B>Author:</B></DT>
<DD>Nathan Bubna</DD>
</DL>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private &nbsp;org.apache.velocity.context.Context</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/velocity/tools/view/tools/ViewRenderTool.html#context">context</A></B></CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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</TABLE>
&nbsp;<A NAME="fields_inherited_from_class_org.apache.velocity.tools.generic.RenderTool"><!-- --></A>
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<TH ALIGN="left"><B>Fields inherited from class org.apache.velocity.tools.generic.<A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html" title="class in org.apache.velocity.tools.generic">RenderTool</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#DEFAULT_PARSE_DEPTH">DEFAULT_PARSE_DEPTH</A>, <A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#KEY_CATCH_EXCEPTIONS">KEY_CATCH_EXCEPTIONS</A>, <A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#KEY_PARSE_DEPTH">KEY_PARSE_DEPTH</A></CODE></TD>
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<TD><CODE><B><A HREF="../../../../../../org/apache/velocity/tools/view/tools/ViewRenderTool.html#ViewRenderTool()">ViewRenderTool</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs a new instance</TD>
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<CODE>&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/velocity/tools/view/tools/ViewRenderTool.html#eval(java.lang.String)">eval</A></B>(java.lang.String&nbsp;vtl)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Evaluates a String containing VTL using the current context,
and returns the result as a String.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/velocity/tools/view/tools/ViewRenderTool.html#init(java.lang.Object)">init</A></B>(java.lang.Object&nbsp;obj)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initializes this instance.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/velocity/tools/view/tools/ViewRenderTool.html#recurse(java.lang.String)">recurse</A></B>(java.lang.String&nbsp;vtl)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Recursively evaluates a String containing VTL using the
current context, and returns the result as a String.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_org.apache.velocity.tools.generic.RenderTool"><!-- --></A>
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class org.apache.velocity.tools.generic.<A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html" title="class in org.apache.velocity.tools.generic">RenderTool</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#configure(java.util.Map)">configure</A>, <A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#eval(org.apache.velocity.context.Context, java.lang.String)">eval</A>, <A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#getCatchExceptions()">getCatchExceptions</A>, <A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#getParseDepth()">getParseDepth</A>, <A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#internalRecurse(org.apache.velocity.context.Context, java.lang.String, int)">internalRecurse</A>, <A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#recurse(org.apache.velocity.context.Context, java.lang.String)">recurse</A>, <A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#setCatchExceptions(boolean)">setCatchExceptions</A>, <A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#setParseDepth(int)">setParseDepth</A>, <A HREF="../../../../../../org/apache/velocity/tools/generic/RenderTool.html#setVelocityEngine(org.apache.velocity.app.VelocityEngine)">setVelocityEngine</A></CODE></TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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&nbsp;
<P>
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<A NAME="context"><!-- --></A><H3>
context</H3>
<PRE>
private org.apache.velocity.context.Context <B>context</B></PRE>
<DL>
<DL>
</DL>
</DL>
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<A NAME="ViewRenderTool()"><!-- --></A><H3>
ViewRenderTool</H3>
<PRE>
public <B>ViewRenderTool</B>()</PRE>
<DL>
<DD>Constructs a new instance
<P>
</DL>
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<A NAME="init(java.lang.Object)"><!-- --></A><H3>
init</H3>
<PRE>
public void <B>init</B>(java.lang.Object&nbsp;obj)</PRE>
<DL>
<DD>Initializes this instance.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>obj</CODE> - the current Context</DL>
</DD>
</DL>
<HR>
<A NAME="eval(java.lang.String)"><!-- --></A><H3>
eval</H3>
<PRE>
public java.lang.String <B>eval</B>(java.lang.String&nbsp;vtl)
throws java.lang.Exception</PRE>
<DL>
<DD><p>Evaluates a String containing VTL using the current context,
and returns the result as a String. If this fails, then
<code>null</code> will be returned. This evaluation is not
recursive.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>vtl</CODE> - the code to be evaluated
<DT><B>Returns:</B><DD>the evaluated code as a String
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="recurse(java.lang.String)"><!-- --></A><H3>
recurse</H3>
<PRE>
public java.lang.String <B>recurse</B>(java.lang.String&nbsp;vtl)
throws java.lang.Exception</PRE>
<DL>
<DD><p>Recursively evaluates a String containing VTL using the
current context, and returns the result as a String. It
will continue to re-evaluate the output of the last
evaluation until an evaluation returns the same code
that was fed into it.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>vtl</CODE> - the code to be evaluated
<DT><B>Returns:</B><DD>the evaluated code as a String
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE></DL>
</DD>
</DL>
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