I wrote an implementation of FormDataAccessor for accessing Spring Web Flow. I posted it here if someone needs it.
Code:
package ro.theredpoint.util.xt;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.springframework.validation.Errors;
import org.springframework.webflow.action.FormObjectAccessor;
import org.springframework.webflow.context.ExternalContext;
import org.springframework.webflow.context.ExternalContextHolder;
import org.springframework.webflow.context.servlet.ServletExternalContext;
import org.springframework.webflow.execution.FlowExecution;
import org.springframework.webflow.execution.repository.FlowExecutionKey;
import org.springframework.webflow.execution.repository.FlowExecutionRepository;
import org.springframework.webflow.executor.FlowExecutorImpl;
import org.springframework.webflow.executor.mvc.FlowController;
import org.springframework.webflow.executor.support.FlowExecutorArgumentHandler;
import org.springmodules.xt.ajax.FormDataAccessor;
/**
*
* @author Elvis Ciocoiu
*
*/
public class SWFFormDataAccessor implements FormDataAccessor {
private static final Logger LOG = Logger.getLogger(SWFFormDataAccessor.class);
public Object getCommandObject(HttpServletRequest request,
HttpServletResponse response, Object handler, Map model) {
Object command = extract(request, response, (FlowController) handler, new SWFAccessorCallback() {
public Object extract(FlowExecution flowExecution) {
return flowExecution.getActiveSession().getScope().get(FormObjectAccessor.getCurrentFormObjectName());
}
});
return command;
}
public Errors getValidationErrors(HttpServletRequest request,
HttpServletResponse response, Object handler, Map model) {
Errors errors = (Errors) extract(request, response, (FlowController) handler, new SWFAccessorCallback() {
public Object extract(FlowExecution flowExecution) {
return (Errors) flowExecution.getActiveSession().getFlashMap().get(
FormObjectAccessor.getCurrentFormErrorsName(), Errors.class);
}
});
return errors;
}
private Object extract(HttpServletRequest request,
HttpServletResponse response, FlowController flowControllerflowControllertroller, SWFAccessorCallback callbak) {
FlowExecutionRepository repository = ((FlowExecutorImpl)flowControllerflowControllertroller.getFlowExecutor()).getExecutionRepository();
FlowExecutorArgumentHandler argumentHandler = flowControllerflowControllertroller.getArgumentHandler();
ExternalContext externalContext = new ServletExternalContext(request.getSession().getServletContext(), request, response);
if (argumentHandler.isFlowExecutionKeyPresent(externalContext)) {
try {
ExternalContextHolder.setExternalContext(externalContext);
FlowExecutionKey flowExecutionKey =
repository.parseFlowExecutionKey(argumentHandler.extractFlowExecutionKey(externalContext));
FlowExecution flowExecution = repository.getFlowExecution(flowExecutionKey);
return callbak.extract(flowExecution);
}
catch (Exception e) {
e.printStackTrace();
}
finally {
ExternalContextHolder.setExternalContext(null);
}
}
return null;
}
interface SWFAccessorCallback {
Object extract(FlowExecution flowExecution);
}
}
. The first solution for that is to make a servlet filter that wraps HttpServletRequest and respond for a parameter named "_eventId" with the value of "customEventId" (or json-params["_eventId"]). That's because the HttpServletFilter.getParameterMap() returns a readonly map. I've done that and it works but I think it's to much effort just for that. Another solution I think is to implement a custom FlowExecutorArgumentExtractor and configure the FlowController with it. This implementation will search for the event id also in other parameters (like "customEventId" or json-params["_eventId"]. I don't think that SWF team implemented the FlowExecutorArgumentExtractor hierarchy with this kind of customization in mind. Or I could use a custom FlowController implementation that adds this parameter in ServletExternalContext along with the request parameters. I think that the easiest and cleanest way to integrate xt and SWF is to let me send directly a parameter (in my case named "_eventId") to the server. What do you think?
.
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