Re: [WebMacro-user] A WM brain bender

[Alex Twisleton-Wykeham-F. <al...@fi...>]

Last message (promise) :-)

Here is a more efficient implementation:-

package org.cord.node;

import org.webmacro.*;
import org.webmacro.engine.*;
import org.webmacro.resource.*;

public class EvaluatingTemplateLoader
  extends AbstractTemplateLoader 
{
  public final static String PROTOCOL = "evaluate:";

  public void setConfig(String config) 
  {
  }

  public Template load(String query,
                       CacheElement ce) 
    throws ResourceException
  {
    if (! query.startsWith(PROTOCOL)) {
      return null;
    }
    return new StringTemplate(broker,
                              query.substring(PROTOCOL.length()));
  }
}

TemplateLoaderPath.1=evaluate:
TemplateLoader.evaluate=org.cord.node.EvaluatingTemplateLoader

#include as template "evaluate:<p>Hello, \$name</p>"

This will now get invoked first of all out of the chain of TemplateLoaders and 
will rapidly discard any request that doesn't start with "evaluate:" thereby 
grabbing any requests as possible.  The advantage with this is that the 
contents of the string that you are going to evaluate are going to change 
across a wide range of values.  If the EvaluatingTemplateLoader is the last 
in the chain then all your default template loaders are going to have to scan 
their sources for each of your dynamic templates which will end up being very 
expensive.

Hope this helps

Alex