contextmenuitemtaskrenderer.java

esri的ArcGIS Server超级学习模板程序（for java）

package com.esri.solutions.jitk.common.contextmenus;

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

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import com.esri.adf.web.faces.component.TocControl;
import com.esri.adf.web.faces.renderkit.xml.ajax.AJAXRenderer;
import com.esri.adf.web.util.XMLUtil;

/**
 * Provides necessary rendering to the browser for opening
 * a Task that is associated with a Context Menu Item in the
 * Table of Contents. This object will need a reference to 
 * the Context Menu Item Task Manager as it provides the logic
 * to open the Task UI. 
 */
public class ContextMenuItemTaskRenderer implements AJAXRenderer {

	/**
	 * Contains logic to generate XML so the Task UI can be
	 * opened in the browser.
	 */
	private ContextMenuItemTaskManager m_mgr;

	/*
	 * (non-Javadoc)
	 * @see com.esri.adf.web.faces.renderkit.xml.ajax.AJAXRenderer#getControlClass()
	 */
	@SuppressWarnings("unchecked")
	public Class getControlClass() {
		return TocControl.class;
	}

	/*
	 * (non-Javadoc)
	 * @see com.esri.adf.web.faces.renderkit.xml.ajax.AJAXRenderer#getOriginalState(javax.faces.component.UIComponent)
	 */
	public Object getOriginalState(UIComponent ctrl) {
		Document xmlDoc = XMLUtil.newDocument();
		renderOurOwnXML(XMLUtil.createElement(xmlDoc, "root", null, null), ctrl);
	    return XMLUtil.transform(xmlDoc, null);
	    
	}

	/*
	 * (non-Javadoc)
	 * @see com.esri.adf.web.faces.renderkit.xml.ajax.AJAXRenderer#renderAjaxResponse(javax.faces.context.FacesContext, javax.faces.component.UIComponent, java.lang.Object, boolean, org.w3c.dom.Element)
	 */
	public void renderAjaxResponse(FacesContext fc, 
								   UIComponent ctrl,
								   Object oldState, 
								   boolean b, 
								   Element parent) {
		
		Document xmlDoc = XMLUtil.newDocument();
	    renderOurOwnXML(XMLUtil.createElement(xmlDoc, "root", null, null), ctrl);
	    String newState = XMLUtil.transform(xmlDoc, null);

	    if( ! oldState.equals(newState)) {
	    	parent.appendChild(parent.getOwnerDocument().importNode(xmlDoc.getElementsByTagName("root").item(0).getFirstChild(), true));
	    }
		
	}
	
	/**
	 * Renders the necessary XML in order to open the Task UI in the browser.
	 * There will be Javascript code in the browser to interpret the XML
	 * and provide the logic to open the Task UI.  This method will delegate
	 * to the Context Menu Item Task Manager to implement the rendering
	 * logic.
	 * 
	 * @param parentElement		Parent XML element.  Rendered XML must be
	 * 							added as a child to this element.
	 * @param aComponent		UI Component that this rendering is associated
	 * 							with, typically {@link TocControl}.
	 */
	public void renderOurOwnXML(final Element parentElement, final UIComponent aComponent) {
		m_mgr.open(parentElement, aComponent);
	}
	
	/**
	 * Sets the reference to the Context Menu Item Task Manager object.
	 * This object is required in order for this renderer to function
	 * correctly.
	 * 
	 * @param mgr		Reference to Context Menu Item Task Manager.
	 */
	public void setContextMenuItemTaskManager (ContextMenuItemTaskManager mgr) {
		m_mgr = mgr;
	}

}