org.primefaces.application.resource.DynamicResourcesPhaseListener Maven / Gradle / Ivy

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There is a newer version: 14.0.0-RC3

package org.primefaces.application.resource;

import java.util.ArrayList;

import javax.faces.context.FacesContext;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import org.primefaces.util.ResourceUtils;

public class DynamicResourcesPhaseListener implements PhaseListener {

    private static final String INITIAL_RESOURCES = DynamicResourcesPhaseListener.class.getName() + ".INITIAL_RESOURCES";
   
    @Override
    public void beforePhase(PhaseEvent event) {

    }

    @Override
    public void afterPhase(PhaseEvent event) {
        FacesContext context = event.getFacesContext();

        // we only need to collect resources on ajax requests
        // for non ajax, the head will always be rendered again
        if (context.getViewRoot() == null || !context.getPartialViewContext().isAjaxRequest()) {
            return;
        }

        // collect all current resources before new components can be added to the view in later phases
        ArrayList initialResources = ResourceUtils.getComponentResources(context);

        putInitialResources(context, initialResources);
    }

    @Override
    public PhaseId getPhaseId() {
        return PhaseId.RESTORE_VIEW;
    }
    
    public static void putInitialResources(FacesContext context, ArrayList resources) {
        context.getAttributes().put(INITIAL_RESOURCES, resources);
    }
    
    public static ArrayList getInitialResources(FacesContext context) {
        return (ArrayList) context.getAttributes().get(INITIAL_RESOURCES);
    }
    
}