Adding a validator at runtime

[Kamal Bhatt <kb...@tt.com.au>]

Hi
This is a follow on from my previous email. I have decided that would 
like to create a custom validator when a certain condition is met. In 
this case, the validation checks if a value in is equal to an existing 
field.

Here is a snippet of my flow script:

    var validator = new 
Packages.creative.validation.ParentRegionsValidation();

    /* Keep showing form until it is validated and saved correctly to 
the database */
    while (true)
    {
        try
        {
            form.showForm("call-display-pipeline.jx", screenData);

            var idx = 0;
            var parentregions = form.getChild("parentregions");

            while (parentregions != null && idx < parentregions.getSize())
            {
                cocoon.log.error("removing validator");
                
parentregions.getRow(idx).getChild("id").removeValidator(validator);
                idx = idx + 1;
            }
 
            if (!isTopMost)
            {
                idx = 0;
                while (parentregions != null && idx < 
parentregions.getSize())
                {
                    cocoon.log.error("adding validator");
                    
parentregions.getRow(idx).getChild("id").addValidator(validator);
                    if 
(parentregions.getRow(idx).getChild("id").removeValidator(validator))
                    {
                        cocoon.log.error("KamBha: Removed validator");
                    }
                    else
                    {  
                        cocoon.log.error("KamBha: Validator was never 
added");
                    }

                    
parentregions.getRow(idx).getChild("id").addValidator(validator);
                    idx = idx + 1;
                }
            }
        }
        catch(e)
        {
            return;
        }
I know that I have got the field I want to attach the validator to as I 
had code to check the value of the widget, and it was what I expected. I 
found that the validator does get added. If I move the showForm to after 
I add the validator I get the following error:

2059002 2006-07-20 16:48:08,919 [http-8080-Processor25] ERROR 
sitemap.handled-errors.prepareErrorHandler():165  - <map:call function> 
did not send a response, at 
file:/opt/lenya/jakarta-tomcat-5.0.28/webapps/cms/lenya/pubs/ch/usecase-region.xmap:138:35
org.apache.cocoon.ProcessingException: <map:call function> did not send 
a response.

The following is my validator.

package creative.validation;

import java.lang.String;

import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.context.ContextException;
import org.apache.avalon.framework.context.Contextualizable;
import org.apache.avalon.framework.logger.LogEnabled;
import org.apache.avalon.framework.logger.Logger;
import org.apache.cocoon.forms.formmodel.Widget;
import org.apache.cocoon.forms.validation.ValidationError;
import org.apache.cocoon.forms.validation.ValidationErrorAware;
import org.apache.cocoon.forms.validation.WidgetValidator;

public class ParentRegionsValidation implements WidgetValidator, 
LogEnabled, Contextualizable
{
    private Logger logger = null;
    private Context context = null;

    public boolean validate(Widget widget)
    {
        String regionId = (String) 
widget.getForm().getChild("region_id").getValue();
        System.out.println("In validate");
        logger.error("In validate");


        if (regionId.equals((String)widget.getValue()))
        {
            if (widget instanceof ValidationErrorAware)
            {
                System.out.println("validation error");
                logger.error("Validation error");
                ((ValidationErrorAware)widget).setValidationError(new 
ValidationError("Current region cannot be parent of itself"));
                return(false);
            }
        }
        System.out.println("No validation error");
        logger.error("No validation error");
        return(true);
    }

    public void enableLogging(Logger logger)
    {
        this.logger = logger;
    }

    public void contextualize(Context context) throws ContextException
    {
        this.context = context;
    }
}

None of the print statements in the validator gets called when it is 
working. I guess I understand why it wouldn't work when 
call-display-pipeline is called before adding the validator, but I don't 
understand why it would give me an error when I move it to the end. I am 
using cocoon 2.1.7. If you need further code, I will give it. Any help 
is appreciated.

Thanks

-- 
Kamal Bhatt


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