Redirect implementation

Question

I am trying to move redirect functionality from scriptlet to Sightly class. What I have done so far:

package apps.myproject.components.page.generic;

import java.io.IOException;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.day.cq.wcm.foundation.ELEvaluator;
import com.adobe.cq.sightly.WCMUse;

public class PageComponent extends WCMUse {

    private static final Logger log = LoggerFactory.getLogger(PageComponent.class);

    public void activate() throws Exception {

    }

    public void redirect() throws IOException{
        String location = getProperties().get("redirectTarget", "");

        // resolve variables in path
        //where I can find PageContext Object?
        //location = ELEvaluator.evaluate(location, getRequest(), new PageContext());

        boolean wcmModeIsDisabled = getWcmMode().isDisabled();
        boolean wcmModeIsPreview = getWcmMode().isPreview();
        if ( (location.length() > 0) && ((wcmModeIsDisabled) || (wcmModeIsPreview)) ) {
            // check for recursion
            if (getCurrentPage() != null && !location.equals(getCurrentPage().getPath()) && location.length() > 0) {
                // check for absolute path
                final int protocolIndex = location.indexOf(":/");
                final int queryIndex = location.indexOf('?');
                final String redirectPath;
                if ( protocolIndex > -1 && (queryIndex == -1 || queryIndex > protocolIndex) ) {
                    redirectPath = location;
                } else {
                    redirectPath = getResourceResolver().map(getRequest(), location) + ".html";
                }
                getResponse().sendRedirect(redirectPath);
            } else {
                getResponse().sendError(HttpServletResponse.SC_NOT_FOUND);
            }
        }
    }
}

The problem is that I do not know where should I get the PageContext object for ELEvaluator.evaluate() method from. Passing null throws me NullPointerException, passing new PageContext() throws

java.lang.Error: Unresolved compilation problem: 
    Cannot instantiate the type PageContext

How to use ELEvaluator or something similar in Sightly class? Any ideas?

possible duplicate of [What is a Null Pointer Exception, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception-and-how-do-i-fix-it) — Ashley Medway, Feb 26 '15 at 16:37
@AshleyMedway No it is definitely not a duplicate. My question is how can I use ELEvaluator.evaluate() into Sightly class while I have no pageContext object over there? Optionally: is there something similar to ELEvaluator in Sightly that avoids using pageContext? Take a look at the last sentence of my question. — kmb, Feb 26 '15 at 20:47
@AshleyMedway The question is not about the NullPointerException but about the usage of the particular method in a different way. — kmb, Feb 27 '15 at 10:15

score 0 · Answer 1 · answered Feb 27 '15 at 11:00

0

Not really sure if it answers your question, but to me ELEvaluator.evaluate is to evaluate a potential expression stored in your redirectTarget property. If you're not looking for an edge case you can just ignore the whole line and focus on your redirect.

read the property
validate and externalize
response.sendRedirect(link)

answered Feb 27 '15 at 11:00

cwoeltge

201
1
4

Yes, the presented code works fine, it redirects me to a required location, but I'm still worried about the missing functionality of ELEvaluator. Thanks for your response. – kmb Feb 27 '15 at 12:39

Redirect implementation

1 Answers1