tablerenderer.java

esri的ArcGIS Server超级学习模板程序（for java）

package com.esri.solutions.jitk.web.faces.renderkit.xml.ajax;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import com.esri.adf.web.faces.renderkit.xml.ajax.AJAXRenderer;
import com.esri.adf.web.util.XMLUtil;
import com.esri.solutions.jitk.web.data.results.RenderControlledResults;
import com.esri.solutions.jitk.web.data.results.TableModel;
import com.esri.solutions.jitk.web.faces.component.TableControl;
import com.esri.solutions.jitk.web.faces.renderkit.xml.TableRendererUtil;
import com.esri.solutions.jitk.web.tasks.IRenderAware;

public class TableRenderer implements AJAXRenderer {
	private static Logger _logger = LogManager.getLogger(TableRenderer.class.getName());
    
    @SuppressWarnings("unchecked")
    public Class getControlClass() {
        return TableControl.class;
    }    

    public void renderAjaxResponse(FacesContext facesContext, UIComponent component, Object origState, boolean isEventSource, Element parentElement) {
        
        TableControl control = (TableControl) component;      
        if(!control.isVisible()) return;
        
        try {
            // create state xml to compare with original state
            Document doc = XMLUtil.newDocument();
            Element root = XMLUtil.createElement(doc, "table", null, null);
            XMLUtil.createElement(doc, "id", control.getId(), root);
            XMLUtil.createElement(doc, "map-id", control.getMapId(), root);
            XMLUtil.createElement(doc, "common-resources-registered", "true", root); //CHANGED FOR POSTBACK
            XMLUtil.createElement(doc, "first-time", "false", root); //CHANGED FOR POSTBACK
            TableRendererUtil.renderTableXml(control.getTableModel(), control.getId(), root);
            String xml = XMLUtil.transform(doc, null);
            
		    TableModel tableModel = control.getTableModel();
            
            if (isShouldRender(tableModel, xml, origState)) {             
                // return rendered html
                Element tableElement = XMLUtil.createElement("table", null, parentElement);
                XMLUtil.createElement("id", control.getId(), tableElement);
                XMLUtil.createElement("map-id", control.getMapId(), tableElement);
                XMLUtil.createElement("common-resources-registered", "true", tableElement); //CHANGED FOR POSTBACK
                XMLUtil.createElement("first-time", "false", tableElement); //CHANGED FOR POSTBACK
                XMLUtil.createElement("content", XMLUtil.transform(doc, control.getXslUrl()), tableElement);
            }

            _logger.debug(XMLUtil.transform(parentElement.getOwnerDocument(), null));
        
        } catch (Exception ex) {
        	_logger.error("Unable to encode the table control.", ex);
        }
    }
    
    public Object getOriginalState(UIComponent component) {        
        String state = "table";
        
    	TableControl control = (TableControl) component;      
    	TableModel tableModel = control.getTableModel();
    	
    	//If the table model is render controlled, then no need to return
    	//orignal state to compare with changed state to make the determination
    	//of whether rendering should take place or not. Render controlled
    	//table modles have a property exposed (isShouldRender()) that can
    	//be used to determine if rendering should take place. This reduces the
    	//need for intraspection and gives the application a performance boost
    	if(!(tableModel instanceof RenderControlledResults)) {
	    	Document doc = XMLUtil.newDocument();
	        Element root = XMLUtil.createElement(doc, "table", null, null);
	        XMLUtil.createElement(doc, "id", control.getId(), root);
	        XMLUtil.createElement(doc, "map-id", control.getMapId(), root);
	        XMLUtil.createElement(doc, "common-resources-registered", "true", root); //CHANGED FOR POSTBACK
	        XMLUtil.createElement(doc, "first-time", "false", root); //CHANGED FOR POSTBACK
	        TableRendererUtil.renderTableXml(tableModel, control.getId(), root);    
	        state = XMLUtil.transform(doc, null);
    	}
        
        return state;
    }
    
    protected boolean isShouldRender(TableModel tableModel, String xml, Object origState) {
        boolean isShouldRender = false;
    	
    	if (tableModel instanceof RenderControlledResults) {
	    	IRenderAware renderAware = (IRenderAware) tableModel;    
	    	isShouldRender = renderAware.isShouldRender();
	    	
	    	if (isShouldRender) {
	    		_logger.debug("Table Model requested results render, rendering will take place");
	    		renderAware.setShouldRender(false);
	    	}
        
    	} else {
    		isShouldRender = !xml.equals(origState);
    	}
    	
    	return isShouldRender;
    }
}