PostbackPhaseListener.java :  » JBoss » richfaces-ui-3.3.2 » org » richfaces » treemodeladaptor » Java Open Source

package org.richfaces.treemodeladaptor;

import java.util.Map;

import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;

public class PostbackPhaseListener implements PhaseListener {

  public static final String POSTBACK_ATTRIBUTE_NAME = PostbackPhaseListener.class.getName();
  
  public void afterPhase(PhaseEvent event) {
  }

  public void beforePhase(PhaseEvent event) {
    FacesContext facesContext = event.getFacesContext();
    Map requestMap = facesContext.getExternalContext().getRequestMap();
    requestMap.put(POSTBACK_ATTRIBUTE_NAME, Boolean.TRUE);
  }

  public PhaseId getPhaseId() {
    return PhaseId.APPLY_REQUEST_VALUES;
  }

  public static boolean isPostback() {
    FacesContext facesContext = FacesContext.getCurrentInstance();
    if (facesContext != null) {
      ExternalContext externalContext = facesContext.getExternalContext();
      if (externalContext != null) {
        return Boolean.TRUE.equals(
            externalContext.getRequestMap().get(POSTBACK_ATTRIBUTE_NAME));
      }
    }
    
    return false;
  }
  
}