26016 - How to Instantiate the Visual Data Explorer with an Information Map

SUPPORT / SAMPLES & SAS NOTES

Support

Sample 26016: How to Instantiate the Visual Data Explorer with an Information Map

Overview

This sample shows how to create a Visual Data Explorer project that connects to data via a Foundation Services connection. The VisualDataExplorer is a TransformationBean^TM that generates the appropriate HTML 4.0 and JavaScript for viewing either relational or OLAP information maps. The VisualDataExplorer can display the information map data using tables and graphs.

Here are the steps for creating a simple VisualDataExplorer:

Create a VisualDataExplorer.
Connect to your data.
Create a SessionContext for your model.
Set the model on the VisualDataExplorer.
Create an ActionProvider.
Set the ActionProvider on the VisualDataExplorer.
Render the VisualDataExplorer.

This sample is based on the Information Map Viewer Servlet (Uses SAS Visual Data Explorer) template that is available in SAS^® AppDev Studio. Click the Full Code tab in this sample for instructions on how to modify the template project.

Additional Documentation

For a list of samples for common tasks, see SAS Note 32218.
The SAS AppDev Studio Developer's Site contains detailed information that will assist you when developing Web applications with SAS AppDev Studio.

These sample files and code examples are provided by SAS Institute Inc. "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Recipients acknowledge and agree that SAS Institute shall not be liable for any damages whatsoever arising out of their use of this material. In addition, SAS Institute will provide no support for the materials contained herein.

Instructions

Build a new Web application project in SAS AppDev Studio by using the Information Map Viewer Servlet (Uses SAS Visual Data Explorer) template.
The template will generate a servlet and a JSP file, which, by default, are named InfoMapViewerExampleControllerServlet.java and InfoMapViewerExampleViewer.jsp. Replace the contents of these files with the code below.
Execute the servlet on the test Tomcat server.

Tip: For help with building a Web application project and testing a Web application, see SAS Note 32218.

Code for InfoMapViewerExampleViewer.jsp


<%@ taglib uri="http://www.sas.com/taglib/sas" prefix="sas" %>
<%@page import="com.sas.servlet.tbeans.dataexplorer.html.VisualDataExplorer"%>
<%@ page pageEncoding="UTF-8"%>
<html>
<head>
	<link href="styles/sasComponents.css" rel="STYLESHEET" type="text/css">
</head>
<body style="margin: 0px;">
	
<%
	VisualDataExplorer vde = (VisualDataExplorer)session.getAttribute("vde");
	if( null == vde ){
		throw new RuntimeException( "The Visual Data Explorer does not exist on the session.  " +
				"Be sure that you executed the servlet, and not the jsp directly " );
	}

	vde.setRequest(request);
	vde.setResponse(response);
	vde.write(out);
	 
%>

</body>
</html>

Code for InfoMapViewerExampleControllerServlet.java

Required changes

Edit the value of the MAP_NAME field to point to an information map. The code uses the following as an example:
private static final String MAP_NAME = "SBIP://Foundation/BIP Tree/ReportStudio/Maps/OrionStar Map";
If you did not use the default values during the generation of the project, then you might need to update the following values.
- The package for the servlet.
  package servlets;
- The servlet name.
  public class InfoMapViewerExampleControllerServlet ...
- The URL mapping for the action provider, which must match the servlet mapping for the servlet.
  sas_actionProvider.setControllerURL(request.getContextPath()+ "/InfoMapViewerExample");


package servlets;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import listeners.ExamplesSessionBindingListener;

import com.sas.actionprovider.HttpActionProvider;
import com.sas.services.discovery.DiscoveryService;
import com.sas.services.discovery.DiscoveryServiceInterface;
import com.sas.services.discovery.ServiceTemplate;
import com.sas.services.session.SessionContextInterface;
import com.sas.services.session.SessionServiceInterface;
import com.sas.services.user.UserContextInterface;
import com.sas.services.user.UserServiceInterface;
import com.sas.servlet.tbeans.dataexplorer.html.VisualDataExplorer;
import com.sas.servlet.util.BaseUtil;
import com.sas.web.keys.ComponentKeys;

public class InfoMapViewerExampleControllerServlet extends
		javax.servlet.http.HttpServlet {
	// Declare a default version ID since parent class implements
	// java.io.Serializable
	private static final long serialVersionUID = 1L;
	private static final String ACTION_PROVIDER = "sas_actionProvider_InfoMapViewerExample";
	private static final String VISUAL_DATA_EXPLORER = "vde";

	// Edit this path to point to an information map
	private static final String MAP_NAME = "SBIP://Foundation/BIP Tree/ReportStudio/Maps/OrionStar Map";

	/*
	 * doPost() Respond to the Post message.
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// Note: Calling doGet to provide same behavior to POST and GET HTTP
		// methods.
		doGet(request, response);
	}

	/*
	 * doGet() Respond to the Get message.
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// Note: Add User DO_GET code here
		HttpSession session = request.getSession();

		// Ensure character set is specified before calling
		// response.getWriter().
		String charset = BaseUtil.getOutputCharacterEncoding(request);
		response.setContentType("text/html; charset=" + charset);
		// Setup the ActionProvider
		HttpActionProvider sas_actionProvider = null;
		synchronized (session) {
			if (session != null) {
				sas_actionProvider = (HttpActionProvider) session
						.getAttribute(ACTION_PROVIDER);
			}
			// if ActionProvider is null, create one and put it on the session
			if (sas_actionProvider == null) {
				sas_actionProvider = new HttpActionProvider();
				sas_actionProvider.setLocale(request.getLocale());
				sas_actionProvider.setControllerURL(request.getContextPath()
						+ "/InfoMapViewerExample");
				sas_actionProvider.setName(ACTION_PROVIDER);
				// store object in its scope
				if (session != null)
					session.setAttribute(ACTION_PROVIDER, sas_actionProvider);
			}
			// else execute the ActionProvider command
			else {
				sas_actionProvider.executeCommand(request, response, response
						.getWriter());
			}
		}

		synchronized (session) {
			// Setup the InformationServicesSelector
			VisualDataExplorer vde = null;
			if (session != null) {
				vde = (VisualDataExplorer) session
						.getAttribute(VISUAL_DATA_EXPLORER);
			}
			if (vde == null) {
				try {
					// Obtain the local discovery service
					DiscoveryServiceInterface discoveryService = DiscoveryService
							.defaultInstance();

					// Use the discovery services to find a user service.
					UserServiceInterface userService = (UserServiceInterface) discoveryService
							.findService(new ServiceTemplate(
									new Class[] { UserServiceInterface.class }));

					// Get a user context from the user service by logging in.
					// The initial parameters are obtained from the web.xml
					// file.
					// Note: A password must be set in the web.xml file.
					ServletConfig sc = getServletConfig();
					String domain = sc.getInitParameter("metadata-domain");
					String username = sc.getInitParameter("metadata-userid");
					String password = sc.getInitParameter("metadata-password");
					UserContextInterface userContext = userService.newUser(
							username, password, domain);
					if (session != null) {
						ExamplesSessionBindingListener.getInstance(session)
								.addUserContext(userContext);
					}

					// Use the discovery services to find a session service.
					SessionServiceInterface sessionService = (SessionServiceInterface) discoveryService
							.findService(new ServiceTemplate(
									new Class[] { SessionServiceInterface.class }));

					// Create a session for this user and bind it to the user
					// context.
					SessionContextInterface sessionContext = sessionService
							.newSessionContext(userContext);
					userContext.setSessionContext(sessionContext);
					if (session != null) {
						ExamplesSessionBindingListener.getInstance(session)
								.addSessionContext(sessionContext,
										"InfoMapViewerExample_lock");
					}

					// Create the Visual Data Explorer, and add it to the
					// session
					// Change the value of the MAP_NAME constant to instantiate
					// the Visual Data Explorer
					// With data
					vde = new VisualDataExplorer(sessionContext, MAP_NAME);

					vde.setActionProvider(sas_actionProvider);
					vde.setId(VISUAL_DATA_EXPLORER);
					if (session != null) {
						session.setAttribute(VISUAL_DATA_EXPLORER, vde);
					}

				} catch (Exception e) {
					throw new ServletException(e);
				}
			}
		}

		// Forward the request to the JSP for display
		String sas_forwardLocation = request
				.getParameter(ComponentKeys.FORWARD_LOCATION);
		if (sas_forwardLocation == null) {
			sas_forwardLocation = "/InfoMapViewerExampleViewer.jsp";
		}
		RequestDispatcher rd = getServletContext().getRequestDispatcher(
				sas_forwardLocation);
		rd.forward(request, response);

	}

}