/* Copyright 2010 ESRI
* 
* All rights reserved under the copyright laws of the United States
* and applicable international laws, treaties, and conventions.
* 
* You may freely redistribute and use this sample code, with or
* without modification, provided you include the original copyright
* notice and use restrictions.
* 
* See the use restrictions.
* 
*/
package com.esri.arcgis.sample.mapzoom;

import com.esri.adf.web.data.WebContext;
import com.esri.adf.web.data.WebMap;
import com.esri.adf.web.data.geometry.WebExtent;
import com.esri.adf.web.faces.component.MapControl;
import com.esri.adf.web.faces.renderkit.xml.ajax.AJAXResponseRenderer;
import com.esri.adf.web.faces.renderkit.xml.ajax.AJAXUtil;
import java.util.Map;
import java.util.Vector;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.component.UIComponent;
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;
import org.w3c.dom.Document;

public class MapZoomPhaseListener implements PhaseListener {
  private static Logger logger = Logger.getLogger(com.esri.arcgis.sample.mapzoom.MapZoomPhaseListener.class.getName());

  //parameter names expected in request
  static final String MAP_ZOOM = "mapZoom";
  static final String FORM_ID = "formId";
  static final String MAP_ID = "mapId";
  static final String FACTOR = "factor";

  //implementation: This PhaseListener must be executed in the JSF's Restore View phase
  public PhaseId getPhaseId() {
    return PhaseId.APPLY_REQUEST_VALUES;
  }

  //implementation: No processing
  public void beforePhase(PhaseEvent phaseEvent) {
    //do nothing
  }

  //implementation: Process functionality based on request parameters
  public void afterPhase(PhaseEvent phaseEvent) {
    FacesContext facesContext = phaseEvent.getFacesContext();
    ExternalContext externalContext = facesContext.getExternalContext();
    Map paramMap = externalContext.getRequestParameterMap();

    //verify if request is to be processed by this PhaseListener
    if (! MAP_ZOOM.equals((String) paramMap.get(MAP_ZOOM)))
      return;

    try {
      //get Form from view
      UIComponent form = facesContext.getViewRoot().findComponent((String) paramMap.get(FORM_ID));

      //get MapControl
      MapControl mapControl = (MapControl) form.findComponent((String) paramMap.get(MAP_ID));

      //get WebMap
      WebMap webMap = mapControl.getWebMap();

      //get WebContext
      WebContext webContext = webMap.getWebContext();

      //set event source as map, since operation is to be performed on the map
      Vector eventSources = new Vector();
      eventSources.add(mapControl.getId());
      AJAXResponseRenderer ajaxRenderer = new AJAXResponseRenderer(facesContext, eventSources, form);

      //get, expand and set map's extent
      WebExtent webExtent = webMap.getCurrentExtent();
      webExtent.expand(Double.parseDouble((String) paramMap.get(FACTOR)));
      webMap.setCurrentExtent(webExtent);

      //refresh context to update all controls
      webContext.refresh();

      //render and get AJAX response Document
      Document doc = ajaxRenderer.renderResponse(facesContext);

      //initialize response
      AJAXUtil.writeResponse(facesContext, doc);
    }
    catch (Exception e) {
      logger.log(Level.SEVERE, "Unable to render xml", e);
    }
    finally {
      //notify Faces Lifecycle
      facesContext.responseComplete();
    }
  }
}