26051 - How to Programatically Create a New Calculated Measure Using the Visual Data Explorer

Sample 26051: How to Programatically Create a New Calculated Measure Using the Visual Data Explorer

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";
Edit the value of the EXPRESSION_STRING field to contain a valid expression for your data. If you don't know what values to enter here, then run the Visual Data Explorer example by itself, and then use the calculated item dialog box in order to create a new calculation. Copy the expression in the dialog box and then enter it for this string.
private static final String EXPRESSION_STRING = "<<root.your_first_measure>> + <<root.your_second_measure>>";
If you did not use the default values during the generation of the project, 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. It 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.iquery.metadata.business.BusinessModel;
import com.sas.iquery.metadata.business.BusinessQuery;
import com.sas.iquery.metadata.business.DataItem;
import com.sas.iquery.metadata.business.DataItemReference;
import com.sas.iquery.metadata.business.Role;
import com.sas.iquery.metadata.expr.ExpressionInterface;
import com.sas.iquery.metadata.expr.ExpressionTypes;
import com.sas.iquery.metadata.expr.ResourceScope;
import com.sas.iquery.metadata.expr.StringExpressionUtil;
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";
	private static final String EXPRESSION_STRING = "<<root.your_first_measure>> + <<root.your_second_measure>>";
	/*
	 * 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);

					BusinessQuery data = (BusinessQuery) vde.getDataModel();
					BusinessModel busModel = data.getBusinessModel();
					DataItemReference dataItemRef;

					ExpressionInterface expr = StringExpressionUtil
							.getInstance().newExpression(busModel,
									EXPRESSION_STRING,
									ExpressionTypes.EXP_TYPE_NUMERIC,
									ResourceScope.BUSINESS_SCOPE);
					DataItem newMeasure = busModel.newDataItem();
					newMeasure.setExpression(expr);
					newMeasure.setLabel("MyTestMeasure");
					busModel.addBusinessItem((DataItem) newMeasure);
					dataItemRef = busModel
							.newDataItemReference((DataItem) newMeasure);
					busModel.addBusinessItem(dataItemRef);
					data.addResultItem((DataItem) dataItemRef, Role.COLUMN);

					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);

	}

}

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.

Date Modified:	2008-07-29 10:17:38
Date Created:	2006-04-20 15:56:24

Product Family	Product	Host	Product Release		SAS Release
Product Family	Product	Host	Starting	Ending	Starting	Ending
SAS System	SAS AppDev Studio	Microsoft Windows XP Professional	3.2		9.1 TS1M3 SP4
		Microsoft Windows Server 2003 Standard Edition	3.2		9.1 TS1M3 SP4
		Microsoft Windows Server 2003 Enterprise Edition	3.2		9.1 TS1M3 SP4
		Microsoft Windows Server 2003 Datacenter Edition	3.2		9.1 TS1M3 SP4
		Microsoft Windows NT Workstation	3.2		9.1 TS1M3 SP4
		Microsoft Windows 2000 Professional	3.2		9.1 TS1M3 SP4
		Microsoft Windows 2000 Server	3.2		9.1 TS1M3 SP4
		Microsoft Windows 2000 Datacenter Server	3.2		9.1 TS1M3 SP4
		Microsoft Windows 2000 Advanced Server	3.2		9.1 TS1M3 SP4
		Microsoft® Windows® for x64	3.2		9.1 TS1M3 SP4
		Windows Vista	3.2		9.1 TS1M3 SP4

Support

Sample 26051: How to Programatically Create a New Calculated Measure Using the Visual Data Explorer

Overview

Additional Documentation

Instructions

Code for InfoMapViewerExampleViewer.jsp

Code for InfoMapViewerExampleControllerServlet.java

Required changes

Operating System and Release Information