26017 - How to Programatically Create a Filter in the Visual Data Explorer

Sample 26017: How to Programatically Create a Filter in 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

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";

Replace the code below with code to create filters that are valid for your data. The sample filters apply filters to two of the hierarchies in the query. A filter can be applied to any hierarchy that is part of the query.

String[] globalMemberNames = {
	"[Geography].[Global].[All Global].[Asia]",
	"[Geography].[Global].[All Global].[Europe]",
	"[Geography].[Global].[All Global].[North America]" };
DataItemMemberFilter globalFilter = new DataItemMemberFilter(globalMemberNames,
		DataItemMemberFilter.LIST_MEMBER_FILTER_TYPE);

String[] yearMemberNames = {
	"[Time].[YQM].[All YQM].[2002]"
};
DataItemMemberFilter yearFilter = new DataItemMemberFilter(yearMemberNames,
		DataItemMemberFilter.LIST_MEMBER_FILTER_TYPE);

// Add the filters to the filters hashtable, using the data item name you wish to filter on
// The initializeBusinessQuery method will use this to apply the filters
filters.put("Global", globalFilter);
filters.put("Year-quarter-month", yearFilter);

Edit the code below to add a measure filter to your query.

Note that the "name_of_your_filter_level" should be a level that is on the same axis as the measures. (This example assumes that the measures are on the column axis. If your table is set up such that the measures and the other level are both on the row axis, then change the line of code that includes "Role.ROW" in order to specify Role.COLUMN instead of Role.ROW.)

StringExpression hierarchyExpression = new StringExpression(); 
hierarchyExpression.setText("[Time].[YQM].[All YQM].[2002]" ); 
hierarchyExpression.setExpressionType(ExpressionTypes.EXP_TYPE_CHARACTER); 

StringExpression measureExpression = new StringExpression(); 
measureExpression.setText("[Measures].[QuantitySUM]" ); 				 

List measureFilterMembers = new Vector();
measureFilterMembers.add(hierarchyExpression);
measureFilterMembers.add(measureExpression);

ComparisonOperator operator = ComparisonOperator.COMPARE_GT;	//our filter operator
Object value = "40000";	//some desirable filter value
...
dataSelection.setSteps(filterSteps, Role.ROW);

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 java.util.ArrayList;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;

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.dataretrieval.QueryConnector;
import com.sas.iquery.metadata.MetadataException;
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.DataSelection;
import com.sas.iquery.metadata.business.InformationMap;
import com.sas.iquery.metadata.business.Role;
import com.sas.iquery.metadata.business.SelectedItem;
import com.sas.iquery.metadata.business.step.StepInterface;
import com.sas.iquery.metadata.business.step.olap.BusinessQueryDataBasedFilter;
import com.sas.iquery.metadata.business.step.olap.DataItemMemberFilter;
import com.sas.iquery.metadata.expr.ComparisonOperator;
import com.sas.iquery.metadata.expr.ExpressionTypes;
import com.sas.iquery.metadata.expr.StringExpression;
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.DataViewer;
import com.sas.servlet.tbeans.dataexplorer.html.VisualDataExplorer;
import com.sas.servlet.tbeans.olaptableview.html.OLAPTableView;
import com.sas.servlet.tbeans.olaptableview.html.OLAPTableViewComposite;
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);

					// Retrieve the VDE data model
					DataSelection dataSelection = (DataSelection) vde
							.getDataModel();

					// Define the data items that should exist on the query. The
					// value should match the item name in the information map
					List rows = new ArrayList();
					List columns = new ArrayList();
					List slicers = new ArrayList();
					Hashtable filters = new Hashtable();

					// Add items to row, column or slicer. Rows and columns must
					// have one or more items. Slicer can have zero or more
					// items
					rows.add("Global");
					rows.add("Demographics");
					columns.add("Year-quarter-month");
					columns.add("Sum of Quantity");
					columns.add("Sum of Total Cost");					
					
					// Create member filters
					String[] globalMemberNames = {
						"[Geography].[Global].[All Global].[Asia]",
						"[Geography].[Global].[All Global].[Europe]",
						"[Geography].[Global].[All Global].[North America]" };
					DataItemMemberFilter globalFilter = new DataItemMemberFilter(globalMemberNames,
							DataItemMemberFilter.LIST_MEMBER_FILTER_TYPE);
					
					String[] yearMemberNames = {
						"[Time].[YQM].[All YQM].[2002]"
					};
					DataItemMemberFilter yearFilter = new DataItemMemberFilter(yearMemberNames,
							DataItemMemberFilter.LIST_MEMBER_FILTER_TYPE);
					
					// Add the filters to the filters hashtable, using the data item name you wish to filter on
					// The initializeBusinessQuery method will use this to apply the filters
					filters.put("Global", globalFilter);
					filters.put("Year-quarter-month", yearFilter);

					// Initialize the model with the rows/column/slicer and member filter selections
					initializeBusinessQuery(dataSelection, true, rows, columns,
							slicers, filters);
					
					// Create and add measure filters						
					StringExpression hierarchyExpression = new StringExpression(); 
					hierarchyExpression.setText("[Time].[YQM].[All YQM].[2002]" ); 
					hierarchyExpression.setExpressionType(ExpressionTypes.EXP_TYPE_CHARACTER); 
					
					StringExpression measureExpression = new StringExpression(); 
					measureExpression.setText("[Measures].[QuantitySUM]" ); 				 
					
					List measureFilterMembers = new Vector();
					measureFilterMembers.add(hierarchyExpression);
					measureFilterMembers.add(measureExpression);
					
					ComparisonOperator operator = ComparisonOperator.COMPARE_GT;	//our filter operator
					Object value = "40000";	//some desirable filter value
					
					//create the new filter step
					BusinessQueryDataBasedFilter dataFilter = 
						new BusinessQueryDataBasedFilter(measureFilterMembers, operator, value);
					
					List filterSteps = new Vector();
					filterSteps.add( dataFilter );
					
					//attempt to apply the new list of steps to the DataSelection in a desired Role
					dataSelection.setSteps(filterSteps, Role.ROW);
					

					

					// Print the mdx query to the log
					printQuery(dataSelection);

					// Refresh the DataViewer, after the model is changed
					DataViewer dv = (DataViewer) vde
							.getComponent(VisualDataExplorer.VISUALDATAEXPLORER_DATAVIEWER);

					// Set the number of rows/columns
					if (null != dv.getOLAPBusinessQueryAdapter()) {
						OLAPTableViewComposite olapTableComposite = (OLAPTableViewComposite) dv
								.getTable();
						OLAPTableView olapTable = (OLAPTableView) olapTableComposite
								.getComponent(OLAPTableViewComposite.OLAPTABLEVIEW_TABLEDATA);
						olapTable.setColumnPageSize(10);
						olapTable.setRowPageSize(20);
					}
					dv.setDataModelNeedsRefreshed();
					dv.reinitialize(false);

					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);

	}

	/* Print the mdx equivalent of a BusinessQuery */
	private void printQuery(BusinessQuery ds) {
		QueryConnector qc = new QueryConnector();
		try {
			String mdxQuery = qc.getPhysicalQuery(ds);
			System.out.println(mdxQuery);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}
	
	private DataItem getDataItem(BusinessQuery businessQuery, String label) {
		DataItem retval = null;
		BusinessModel bmodel = businessQuery.getBusinessModel();
		while (!(bmodel instanceof InformationMap)) {
			bmodel = bmodel.getParentBusinessModel();
		}
		// get all items in this model
		List dataItemList = bmodel.getObjects(false, DataItem.class);
		Iterator iter = dataItemList.iterator();
		while (iter.hasNext() && retval == null) {
			DataItem dataItem = (DataItem) iter.next();
			if (dataItem.getLabel().equalsIgnoreCase(label)) {
				retval = dataItem;
			}
		}
		return retval;
	}

	/* Remove all items from a BusinessQuery */
	public void clearQuery(BusinessQuery businessQuery) {
		List initiallySelected = businessQuery.getSelectedItems();
		for (int i = 0; i < initiallySelected.size(); i++) {
			SelectedItem selected = (SelectedItem) initiallySelected.get(i);
			try {
				businessQuery.removeSelectedItem(selected);
			} catch (MetadataException e) {
				e.printStackTrace();
			}
		}

	}

	public void initializeBusinessQuery(BusinessQuery businessQuery,
			boolean clearQuery, List rows, List columns, List slicers,
			Hashtable filters) {
		if (clearQuery) {
			clearQuery(businessQuery);
		}
		BusinessModel bmodel = businessQuery.getBusinessModel();
		// make sure we are the root business model
		while (!(bmodel instanceof InformationMap)) {
			bmodel = bmodel.getParentBusinessModel();
		}
		// get all items in this model
		List dataItemList = bmodel.getObjects(false, DataItem.class);

		// add items to rows, columns, and filters
		addItemsToRole(businessQuery, dataItemList, rows, Role.ROW, filters);
		addItemsToRole(businessQuery, dataItemList, columns, Role.COLUMN,
				filters);
		addItemsToRole(businessQuery, dataItemList, slicers, Role.BACKGROUND,
				filters);
	}

	/*
	 * Iterate through a list of items. If the item is found in the business
	 * model, add it to the query, on the role specified
	 */
	private void addItemsToRole(BusinessQuery businessQuery, List dataItemList,
			List items, Role role, Hashtable filters) {
		BusinessModel businessModel = businessQuery.getBusinessModel();
		Iterator i = items.iterator();
		for (; i.hasNext();) {
			String itemName = (String) i.next();
			for (Iterator iter = dataItemList.iterator(); iter.hasNext();) {
				DataItem dataItem = (DataItem) iter.next();
				if (dataItem.getLabel().equalsIgnoreCase(itemName)) {
					try {
						// See if the item already exists in the query
						DataItem newDataItem = lookForDataItemInExistingQuery(
								dataItem, businessQuery);
						// If it does not exist in query, check for an existing
						// reference
						if (null == newDataItem) {
							newDataItem = lookForExistingDataItemReference(
									businessModel, dataItem);
							// if a reference doesn't exist, create it, and add
							// it to the model
							if (null == newDataItem) {
								newDataItem = businessModel
										.newDataItemReference(dataItem);
								businessModel.addBusinessItem(newDataItem);
							}
						}
						// Finally, add the item to the query on the proper role
						businessQuery.addResultItem(newDataItem, role);

						// If the filters HashTable contains a value that
						// matches the item name, apply the filter
						if (filters.keySet().contains(itemName)) {
							StepInterface filter = (StepInterface) filters
									.get(itemName);
							for (; newDataItem.getSteps().size() > 0;) {
								newDataItem.removeStep(0);
							}
							newDataItem.addStep(filter);
						}

					} catch (MetadataException e) {
						e.printStackTrace();
					}
				}
			}
		}

	}

	/*
	 * Search through a BusinessQuery, to see if a data item already exists in
	 * that query
	 */
	private DataItem lookForDataItemInExistingQuery(DataItem dataItem,
			BusinessQuery businessQuery) throws MetadataException {
		DataItem retval = null;
		java.util.List queryItems = businessQuery.getResultItems();
		Iterator qi = queryItems.iterator();
		boolean foundItemInQueryItems = false;
		while (qi.hasNext() && !foundItemInQueryItems) {
			DataItem queryItem = (DataItem) qi.next();
			if (queryItem.getLabel().equalsIgnoreCase(dataItem.getLabel())) {
				retval = queryItem;
				foundItemInQueryItems = true;
			}
		}
		return retval;
	}

	/*
	 * Search through a BusinessQuery, to see if a DataItemReference already
	 * exists in that query
	 */
	private DataItemReference lookForExistingDataItemReference(
			BusinessModel businessModel, DataItem dataItem) {
		DataItemReference retval = null;
		List dataItemList = businessModel.getObjects(false,
				DataItemReference.class);
		String label = dataItem.getLabel();
		for (Iterator iter = dataItemList.iterator(); iter.hasNext();) {
			DataItemReference dataItemRef = (DataItemReference) iter.next();
			if (dataItemRef.getLabel().equalsIgnoreCase(label)) {
				retval = dataItemRef;
				break;
			}
		}
		return retval;
	}

	private void turnOnAllTotals(BusinessQuery ds) {
		try {
			ds.setTotalType(BusinessQuery.ALLTOTAL, Role.ROW);
			ds.setTotalType(BusinessQuery.GRANDTOTAL, Role.ROW);
			ds.setTotalType(BusinessQuery.GRANDTOTAL, Role.COLUMN);
			ds.setTotalType(BusinessQuery.ALLTOTAL, Role.COLUMN);
		} catch (MetadataException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

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:	2008-08-06 14:41:18
Date Created:	2006-01-31 13:55:16

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

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Knowledge Base

Sample 26017: How to Programatically Create a Filter in the Visual Data Explorer

Overview

Additional Documentation

Instructions

Code for InfoMapViewerExampleViewer.jsp

Code for InfoMapViewerExampleControllerServlet

Required changes

Operating System and Release Information

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