Minor Updated

git-svn-id: https://svn.d4science.research-infrastructures.eu/gcube/trunk/portlets/user/tabular-data-expression-widget@91831 82a268e6-3cf1-43bd-a215-b396298e98cf

src/main/java/org/gcube/portlets/user/td/expressionwidget/client/progress/ColumnFilterProgressBarUpdater.java

@@ -0,0 +1,67 @@
+/**
+ * 
+ */
+package org.gcube.portlets.user.td.expressionwidget.client.progress;
+
+
+
+
+import org.gcube.portlets.user.td.widgetcommonevent.shared.TRId;
+
+import com.allen_sauer.gwt.log.client.Log;
+import com.sencha.gxt.widget.core.client.ProgressBar;
+
+/**
+ * 
+ * @author "Giancarlo Panichi" 
+ * <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
+ *
+ */
+public class ColumnFilterProgressBarUpdater implements ColumnFilterProgressListener {
+	
+	protected ProgressBar progressBar;
+	
+	/**
+	 * Creates a new {@link ProgressBar} updater.
+	 * @param progressBar the {@link ProgressBar} to update.
+	 */
+	public ColumnFilterProgressBarUpdater(ProgressBar progressBar) {
+		this.progressBar = progressBar;
+	}
+
+	
+	/**
+	 * {@inheritDoc}
+	 */
+	public void operationComplete(TRId trId) {
+		Log.info("Completed");
+		progressBar.updateProgress(1, "Completed");	
+		
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public void operationFailed(Throwable caught, String reason, String failureDetails) {
+		Log.info("Failed");
+		progressBar.updateText("Failed");
+	}
+
+	public void operationInitializing() {
+		Log.info("Inizializing");
+		progressBar.updateProgress(0, "Initializing...");
+	}
+
+	public void operationUpdate(float elaborated) {
+		Log.info("Import elaborated: "+elaborated);
+		if (elaborated == 0) progressBar.updateProgress(0, "Initializing...");
+		if (elaborated>0 && elaborated<1) {
+			Log.trace("progress "+elaborated);
+			int elab=new Float(elaborated*100).intValue();
+			progressBar.updateProgress(elaborated,elab+"% Progress...");
+		}
+		if (elaborated == 1) progressBar.updateProgress(1, "Completing...");
+		
+	}
+
+}

src/main/java/org/gcube/portlets/user/td/expressionwidget/client/progress/ColumnFilterProgressDialog.java

@@ -0,0 +1,123 @@
+package org.gcube.portlets.user.td.expressionwidget.client.progress;
+
+import org.gcube.portlets.user.td.widgetcommonevent.client.event.ChangeTableRequestEvent;
+import org.gcube.portlets.user.td.widgetcommonevent.client.type.ChangeTableRequestType;
+import org.gcube.portlets.user.td.widgetcommonevent.shared.TRId;
+
+import com.allen_sauer.gwt.log.client.Log;
+import com.google.web.bindery.event.shared.EventBus;
+import com.sencha.gxt.core.client.util.Margins;
+import com.sencha.gxt.widget.core.client.FramedPanel;
+import com.sencha.gxt.widget.core.client.ProgressBar;
+import com.sencha.gxt.widget.core.client.Window;
+import com.sencha.gxt.widget.core.client.box.AlertMessageBox;
+import com.sencha.gxt.widget.core.client.button.TextButton;
+import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer.VerticalLayoutData;
+import com.sencha.gxt.widget.core.client.event.HideEvent;
+import com.sencha.gxt.widget.core.client.event.HideEvent.HideHandler;
+import com.sencha.gxt.widget.core.client.event.SelectEvent;
+import com.sencha.gxt.widget.core.client.event.SelectEvent.SelectHandler;
+
+
+
+/**
+ * ColumnFilterProgressDialog is a Dialog that show progress of change the column label 
+ * 
+ * @author "Giancarlo Panichi" 
+ * <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
+ *
+ */
+public class ColumnFilterProgressDialog extends Window implements ColumnFilterProgressListener {
+		public static final int STATUS_POLLING_DELAY = 1000;
+		protected String WIDTH = "400px";
+		protected String HEIGHT = "120px";
+		protected EventBus eventBus;
+		protected ColumnFilterProgressUpdater progressUpdater;
+		protected TextButton ok;
+		protected TRId trId;
+		
+		public ColumnFilterProgressDialog(EventBus eventBus) {
+			this.eventBus=eventBus;
+			setWidth(WIDTH);
+			setHeight(HEIGHT);
+			setBodyBorder(false);
+			setResizable(true);
+			setModal(true);
+			setHeadingText("Change The Column Label Progress");
+			
+			trId=null;
+			
+			FramedPanel panel=new FramedPanel();
+			panel.setHeaderVisible(false);
+			panel.setBodyBorder(false);
+			
+			VerticalLayoutContainer v = new VerticalLayoutContainer();
+			
+			
+			ProgressBar progressBar = new ProgressBar();
+			
+			ok=new TextButton("OK");
+			ok.addSelectHandler(new SelectHandler() {
+				
+				public void onSelect(SelectEvent event) {
+					updateInvocation();
+					
+				}
+			});
+			
+			v.add(progressBar, new VerticalLayoutData(1,
+					1, new Margins(5, 5, 5, 5)));
+			
+			panel.add(v);
+			panel.addButton(ok);
+			add(panel);
+			
+			
+			progressUpdater = new ColumnFilterProgressUpdater();
+			progressUpdater.addListener(new ColumnFilterProgressBarUpdater(progressBar));
+
+			progressUpdater.addListener(this);
+			progressUpdater.scheduleRepeating(STATUS_POLLING_DELAY);
+			show();
+			ok.setVisible(false);
+					
+		}
+
+		public void operationInitializing() {
+			// TODO Auto-generated method stub
+			
+		}
+
+		public void operationUpdate(float elaborated) {
+			// TODO Auto-generated method stub
+			
+		}
+
+		public void operationComplete(TRId trId) {
+			Log.debug("Operation Complete return: "+trId.toString());
+			ok.setVisible(true);
+			this.trId=trId;
+		}
+
+		public void operationFailed(Throwable caught, String reason,
+				String failureDetails) {
+			ok.setVisible(true);
+			this.trId=null;
+			AlertMessageBox d = new AlertMessageBox("Error Applying Column Filter", reason);
+			d.addHideHandler(new HideHandler() {
+				public void onHide(HideEvent event) {	
+				}
+			});
+			d.show();
+		}
+		
+		public void updateInvocation(){
+			if(trId!=null){
+				ChangeTableRequestEvent changeTableRequestEvent=
+						new ChangeTableRequestEvent(ChangeTableRequestType.COLUMNFILTER, trId);
+				eventBus.fireEvent(changeTableRequestEvent);
+			}
+			hide();
+		}
+}

src/main/java/org/gcube/portlets/user/td/expressionwidget/client/progress/ColumnFilterProgressListener.java

@@ -0,0 +1,42 @@
+/**
+ * 
+ */
+package org.gcube.portlets.user.td.expressionwidget.client.progress;
+
+import org.gcube.portlets.user.td.widgetcommonevent.shared.TRId;
+
+
+
+/**
+ * Defines a listener for operation progress.
+ *
+ * @author "Giancarlo Panichi" 
+ * <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
+ *
+ */
+public interface ColumnFilterProgressListener {
+	
+	/**
+	 * Called when the operation is starting.
+	 */
+	public void operationInitializing();
+	
+	/**
+	 * Called when there is a progress for the operation.
+	 * @param elaborated the elaborated part.
+	 */
+	public void operationUpdate(float elaborated);
+	
+	
+	/**
+	 * Called when the operation is complete.
+	 */
+	public void operationComplete(TRId trId);
+
+	/**
+	 * Called when the operation is failed.
+	 * @param caught the failure exception.
+	 * @param reason the failure reason.
+	 */
+	public void operationFailed(Throwable caught, String reason, String failureDetails);
+}

src/main/java/org/gcube/portlets/user/td/expressionwidget/client/progress/ColumnFilterProgressUpdater.java

@@ -0,0 +1,160 @@
+/**
+ * 
+ */
+package org.gcube.portlets.user.td.expressionwidget.client.progress;
+
+import java.util.ArrayList;
+
+import org.gcube.portlets.user.td.expressionwidget.client.rpc.ExpressionServiceAsync;
+import org.gcube.portlets.user.td.expressionwidget.shared.session.ColumnFilterMonitor;
+import org.gcube.portlets.user.td.widgetcommonevent.shared.TRId;
+
+import com.allen_sauer.gwt.log.client.Log;
+import com.google.gwt.user.client.Timer;
+import com.google.gwt.user.client.rpc.AsyncCallback;
+
+
+/**
+ * 
+ * @author "Giancarlo Panichi" 
+ * <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
+ *
+ */
+public class ColumnFilterProgressUpdater extends Timer {
+
+	protected ArrayList<ColumnFilterProgressListener> listeners = new ArrayList<ColumnFilterProgressListener>();
+
+	/**
+	 * {@inheritDoc}
+	 */ 
+	@Override
+	public void run() {
+		Log.debug("requesting operation progress");
+		ExpressionServiceAsync.INSTANCE
+				.getColumnFilterMonitor(new AsyncCallback<ColumnFilterMonitor>() {
+
+					
+					public void onFailure(Throwable caught) {
+						cancel();
+						Log.error("Error retrieving the operation state",
+								caught);
+						String message = getStack(caught);
+						fireOperationFailed(caught,
+								"Failed getting operation updates", message);
+					}
+
+					public void onSuccess(ColumnFilterMonitor result) {
+						Log.info("retrieved ColumnFilterMonitor: "
+								+ result.getStatus());
+						switch (result.getStatus()) {
+						case INITIALIZING:
+							Log.info("Column Filter Initializing...");
+							fireOperationInitializing();
+							break;
+						case ABORTED:
+							cancel();
+							Log.info("Column Filter Operation Aborted");
+							break;
+						case IN_PROGRESS:
+							fireOperationUpdate(result.getProgress());
+							break;
+						case VALIDATING_RULES:
+							fireOperationUpdate(result.getProgress());
+							break;	
+						case STOPPED:
+							cancel();
+							errorMessage(result);
+							break;		
+						case FAILED:
+							cancel();
+							errorMessage(result);
+							break;
+						case SUCCEDED:
+							cancel();
+							Log.info("Column Filter fisnish TableId :"
+									+ result.getTrId());
+							fireOperationComplete(result.getTrId());
+							break;
+						default:
+							Log.info("Unknow State");
+							break;
+						}
+
+					}
+
+					
+
+				});
+
+	}
+
+	protected void errorMessage(ColumnFilterMonitor result) {
+		Log.info("Apply column filter failed");
+		Throwable th = null;
+		String failure = null;
+		String details = null;
+		if (result.getError() != null) {
+			th = result.getError();
+			failure = "Failed Client Library applying column filter";
+			details = result.getError().getLocalizedMessage();
+		} else {
+			th = new Throwable("Failed");
+			failure = "Failed Client Library applying column filter";
+			details = "Apply column filter failed";
+		}
+		
+	
+		fireOperationFailed(th, failure, details);
+	}
+
+	protected String getStack(Throwable e) {
+		String message = e.getLocalizedMessage() + " -> <br>";
+		Throwable c = e.getCause();
+		if (c != null)
+			message += getStack(c);
+		return message;
+	}
+
+	protected void fireOperationInitializing() {
+		for (ColumnFilterProgressListener listener : listeners)
+			listener.operationInitializing();
+	}
+
+	protected void fireOperationUpdate(float elaborated) {
+		for (ColumnFilterProgressListener listener : listeners)
+			listener.operationUpdate(elaborated);
+	}
+
+	protected void fireOperationComplete(TRId trId) {
+		for (ColumnFilterProgressListener listener : listeners)
+			listener.operationComplete(trId);
+	}
+
+	protected void fireOperationFailed(Throwable caught, String failure,
+			String failureDetails) {
+		for (ColumnFilterProgressListener listener : listeners)
+			listener.operationFailed(caught, failure, failureDetails);
+	}
+
+	/**
+	 * Add a new {@link ColumnFilterProgressListener} to this
+	 * {@link ColumnFilterProgressUpdater}.
+	 * 
+	 * @param listener
+	 *            the listener to add.
+	 */
+	public void addListener(ColumnFilterProgressListener listener) {
+		listeners.add(listener);
+	}
+
+	/**
+	 * Removes the specified {@link ColumnFilterProgressListener} from this
+	 * {@link ColumnFilterProgressUpdater}.
+	 * 
+	 * @param listener
+	 *            the listener to remove.
+	 */
+	public void removeListener(ColumnFilterProgressListener listener) {
+		listeners.remove(listener);
+	}
+}

src/main/java/org/gcube/portlets/user/td/expressionwidget/client/rpc/ExpressionService.java

@@ -6,8 +6,9 @@ package org.gcube.portlets.user.td.expressionwidget.client.rpc;
 
 
 import org.gcube.portlets.user.td.expressionwidget.shared.expression.ExpressionServiceException;
-import org.gcube.portlets.user.td.gwtservice.shared.tr.ColumnData;
+import org.gcube.portlets.user.td.expressionwidget.shared.session.ColumnFilterMonitor;
-import org.gcube.portlets.user.td.widgetcommonevent.shared.expression.C_Expression;
+import org.gcube.portlets.user.td.expressionwidget.shared.session.ColumnFilterSession;
+import org.gcube.portlets.user.td.gwtservice.shared.exception.TDGWTServiceException;
 
 import com.google.gwt.user.client.rpc.RemoteService;
 import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
@@ -30,7 +31,23 @@ import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
 @RemoteServiceRelativePath("ExpressionService")
 public interface ExpressionService extends RemoteService {
 
-	public void submitColumnFilter(ColumnData column, C_Expression expression) throws ExpressionServiceException;
+	/**
+	 * Submit Column Filter Operation
+	 * 
+	 * @param columnFilterSession
+	 * @throws ExpressionServiceException
+	 */
+	public void submitColumnFilter(ColumnFilterSession columnFilterSession) throws ExpressionServiceException;
+	
+	/**
+	 * Get Operation Monitor during the applying Column Filter operation
+	 * 
+	 * 
+	 * @return
+	 * @throws ExpressionServiceException
+	 */
+	public ColumnFilterMonitor getColumnFilterMonitor()
+			throws ExpressionServiceException;
 
 	
 

src/main/java/org/gcube/portlets/user/td/expressionwidget/client/rpc/ExpressionServiceAsync.java

@@ -3,8 +3,8 @@
  */
 package org.gcube.portlets.user.td.expressionwidget.client.rpc;
 
-import org.gcube.portlets.user.td.gwtservice.shared.tr.ColumnData;
+import org.gcube.portlets.user.td.expressionwidget.shared.session.ColumnFilterMonitor;
-import org.gcube.portlets.user.td.widgetcommonevent.shared.expression.C_Expression;
+import org.gcube.portlets.user.td.expressionwidget.shared.session.ColumnFilterSession;
 
 import com.google.gwt.core.client.GWT;
 import com.google.gwt.user.client.rpc.AsyncCallback;
@@ -21,6 +21,7 @@ public interface ExpressionServiceAsync {
 	public static ExpressionServiceAsync INSTANCE = (ExpressionServiceAsync) GWT
 			.create(ExpressionService.class);
 
-	void submitColumnFilter(ColumnData column, C_Expression expression,AsyncCallback<Void> callback);
+	void submitColumnFilter(ColumnFilterSession columnFilterSession,AsyncCallback<Void> callback);
-			
+	void getColumnFilterMonitor(AsyncCallback<ColumnFilterMonitor> callback);
+		
 }

src/main/java/org/gcube/portlets/user/td/expressionwidget/server/ExpressionServiceImpl.java

@@ -9,17 +9,23 @@ import javax.servlet.http.HttpSession;
 import org.gcube.application.framework.core.session.ASLSession;
 import org.gcube.data.analysis.tabulardata.commons.utils.AuthorizationProvider;
 import org.gcube.data.analysis.tabulardata.commons.utils.AuthorizationToken;
+import org.gcube.data.analysis.tabulardata.commons.webservice.types.TaskStatus;
 import org.gcube.data.analysis.tabulardata.commons.webservice.types.operations.OperationDefinition;
 import org.gcube.data.analysis.tabulardata.commons.webservice.types.operations.OperationExecution;
+import org.gcube.data.analysis.tabulardata.model.table.Table;
 import org.gcube.data.analysis.tabulardata.service.TabularDataService;
 import org.gcube.data.analysis.tabulardata.service.impl.TabularDataServiceFactory;
+import org.gcube.data.analysis.tabulardata.service.operation.Task;
 import org.gcube.portlets.user.td.expressionwidget.client.rpc.ExpressionService;
 import org.gcube.portlets.user.td.expressionwidget.shared.expression.ExpressionServiceException;
+import org.gcube.portlets.user.td.expressionwidget.shared.session.ColumnFilterMonitor;
+import org.gcube.portlets.user.td.expressionwidget.shared.session.ColumnFilterSession;
 import org.gcube.portlets.user.td.gwtservice.server.SessionUtil;
 import org.gcube.portlets.user.td.gwtservice.server.trservice.OperationDefinitionMap;
 import org.gcube.portlets.user.td.gwtservice.server.trservice.OperationsId;
-import org.gcube.portlets.user.td.gwtservice.shared.tr.ColumnData;
+import org.gcube.portlets.user.td.gwtservice.server.trservice.TaskStateMap;
-import org.gcube.portlets.user.td.widgetcommonevent.shared.expression.C_Expression;
+import org.gcube.portlets.user.td.gwtservice.shared.tr.TabResource;
+import org.gcube.portlets.user.td.widgetcommonevent.shared.TRId;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -28,7 +34,9 @@ import com.google.gwt.user.server.rpc.RemoteServiceServlet;
 public class ExpressionServiceImpl extends RemoteServiceServlet implements
 		ExpressionService {
 
-	private static final long serialVersionUID = -5707400086333186368L;
+	
+	private static final long serialVersionUID = 4632292751581364137L;
+
 	protected static Logger logger = LoggerFactory
 			.getLogger(ExpressionServiceImpl.class);
 
@@ -41,7 +49,7 @@ public class ExpressionServiceImpl extends RemoteServiceServlet implements
 	 * {@inheritDoc}
 	 */
 	@Override
-	public void submitColumnFilter(ColumnData column, C_Expression expression)
+	public void submitColumnFilter(ColumnFilterSession columnFilterSession)
 			throws ExpressionServiceException {
 		
 		try {
@@ -78,7 +86,97 @@ public class ExpressionServiceImpl extends RemoteServiceServlet implements
 		}
 	}
 
-		
+	/**
+	 * {@inheritDoc}
+	 */
+	public ColumnFilterMonitor getColumnFilterMonitor()
+			throws ExpressionServiceException {
+		try {
+			HttpSession session = this.getThreadLocalRequest().getSession();
+			ColumnFilterSession columnFilterSession = ExpressionSession
+					.getColumnFilterSession(session);
+
+			Task task = ExpressionSession.getColumnFilterTask(session);
+			ColumnFilterMonitor columnFilterMonitor = new ColumnFilterMonitor();
+
+			if (task == null) {
+				logger.debug("Task null");
+				throw new ExpressionServiceException(
+						"Error in ColumnFilter task null");
+			} else {
+				TaskStatus status = task.getStatus();
+				if (status == null) {
+					logger.debug("Services TaskStatus : null");
+					throw new ExpressionServiceException(
+							"Error in ColumnFilter Status null");
+				} else {
+					logger.debug("Services TaskStatus: " + task.getStatus());
+
+					columnFilterMonitor.setStatus(TaskStateMap.map(task
+							.getStatus()));
+					switch (columnFilterMonitor.getStatus()) {
+					case FAILED:
+						if (task.getResult() != null) {
+							logger.debug("Task exception:"
+									+ task.getErrorCause());
+							columnFilterMonitor.setError(new Throwable(task
+									.getErrorCause()));
+						} else {
+							logger.debug("Task exception: Error In Column Filter");
+							columnFilterMonitor.setError(new Throwable(
+									"Error In Column Filter"));
+						}
+						columnFilterMonitor.setProgress(task.getProgress());
+						break;
+					case SUCCEDED:
+						logger.debug("Task Result:" + task.getResult());
+						columnFilterMonitor.setProgress(task.getProgress());
+						Table table = task.getResult().getPrimaryTable();
+						logger.debug("Table retrived: " + table.toString());
+						TRId trId = new TRId();
+						trId.setId(columnFilterSession.getColumn()
+								.getTrId().getId());
+						trId.setTableId(String
+								.valueOf(table.getId().getValue()));
+						trId.setTableType(table.getTableType().getName());
+						columnFilterMonitor.setTrId(trId);
+						TabResource tabResource = SessionUtil
+								.getTabResource(session);
+						tabResource.setTrId(trId);
+						SessionUtil.setTabResource(session, tabResource);
+						SessionUtil.setTRId(session, trId);
+						break;
+					case IN_PROGRESS:
+						columnFilterMonitor.setProgress(task.getProgress());
+						break;
+					case VALIDATING_RULES:
+						columnFilterMonitor.setProgress(task.getProgress());
+						break;
+					case ABORTED:
+						break;
+					case STOPPED:
+						columnFilterMonitor.setError(new Throwable(
+								"Operation Stopped on service"));
+						break;
+					case INITIALIZING:
+						break;
+					default:
+						break;
+					}
+				}
+				ExpressionSession.setColumnFilterTask(session, task);
+			}
+
+			logger.info("ColumnFilterMonitor(): " + columnFilterMonitor);
+			return columnFilterMonitor;
+		} catch (Exception e) {
+			e.printStackTrace();
+			throw new ExpressionServiceException("Error applying column filter: "
+					+ e.getLocalizedMessage());
+
+		}
+
+	}	
 		
 	
 

src/main/java/org/gcube/portlets/user/td/expressionwidget/server/ExpressionSession.java

@@ -0,0 +1,101 @@
+/**
+ * 
+ */
+package org.gcube.portlets.user.td.expressionwidget.server;
+
+import javax.servlet.http.HttpSession;
+
+import org.gcube.data.analysis.tabulardata.service.operation.Task;
+import org.gcube.portlets.user.td.expressionwidget.shared.session.ColumnFilterMonitor;
+import org.gcube.portlets.user.td.expressionwidget.shared.session.ColumnFilterSession;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * 
+ * @author "Giancarlo Panichi" <a
+ *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
+ * 
+ */
+public class ExpressionSession {
+
+	
+	protected static final String COLUMN_FILTER_SESSION = "COLUMN_FILTER_SESSION";
+	protected static final String COLUMN_FILTER_SESSION_TASK = "COLUMN_FILTER_SESSION_TASK";
+	protected static final String COLUMN_FILTER_SESSION_MONITOR = "COLUMN_FILTER_SESSION_MONITOR";
+
+	
+	protected static Logger logger = LoggerFactory.getLogger(ExpressionSession.class);
+
+
+	public static ColumnFilterSession getColumnFilterSession(
+			HttpSession httpSession) {
+		ColumnFilterSession columnFilterSession = (ColumnFilterSession) httpSession
+				.getAttribute(COLUMN_FILTER_SESSION);
+		if (columnFilterSession != null) {
+			return columnFilterSession;
+		} else {
+			columnFilterSession = new ColumnFilterSession();
+			httpSession.setAttribute(COLUMN_FILTER_SESSION,
+					columnFilterSession);
+			return columnFilterSession;
+		}
+	}
+
+	public static void setColumnFilterSession(HttpSession httpSession,
+			ColumnFilterSession columnFilterSession) {
+		ColumnFilterSession cf = (ColumnFilterSession) httpSession
+				.getAttribute(COLUMN_FILTER_SESSION);
+		if (cf != null) {
+			httpSession.removeAttribute(COLUMN_FILTER_SESSION);
+		}
+		httpSession.setAttribute(COLUMN_FILTER_SESSION,
+				columnFilterSession);
+
+	}
+
+	public static ColumnFilterMonitor getColumnFilterMonitor(
+			HttpSession httpSession) {
+		ColumnFilterMonitor columnFilterMonitor = (ColumnFilterMonitor) httpSession
+				.getAttribute(COLUMN_FILTER_SESSION_MONITOR);
+		if (columnFilterMonitor != null) {
+			return columnFilterMonitor;
+		} else {
+			columnFilterMonitor = new ColumnFilterMonitor();
+			httpSession.setAttribute(COLUMN_FILTER_SESSION_MONITOR,
+					columnFilterMonitor);
+			return columnFilterMonitor;
+		}
+	}
+
+	public static void setColumnFilterMonitor(HttpSession httpSession,
+			ColumnFilterMonitor columnFilterMonitor) {
+		ColumnFilterMonitor cf = (ColumnFilterMonitor) httpSession
+				.getAttribute(COLUMN_FILTER_SESSION_MONITOR);
+		if (cf != null) {
+			httpSession.removeAttribute(COLUMN_FILTER_SESSION_MONITOR);
+		}
+		httpSession.setAttribute(COLUMN_FILTER_SESSION_MONITOR,
+				columnFilterMonitor);
+
+	}
+
+	public static Task getColumnFilterTask(HttpSession httpSession) {
+		Task monitor = (Task) httpSession.getAttribute(COLUMN_FILTER_SESSION_TASK);
+		if (monitor == null) {
+			logger.error("CHANGE_THE_COLUMN_LABEL_TASK was not acquired");
+		}
+		return monitor;
+	}
+
+	public static void setColumnFilterTask(HttpSession httpSession,
+			Task task) {
+		Task monitor = (Task) httpSession.getAttribute(COLUMN_FILTER_SESSION_TASK);
+		if (monitor != null)
+			httpSession.removeAttribute(COLUMN_FILTER_SESSION_TASK);
+		httpSession.setAttribute(COLUMN_FILTER_SESSION_TASK, task);
+	}
+	
+	
+
+}

src/main/java/org/gcube/portlets/user/td/expressionwidget/shared/session/ColumnFilterMonitor.java

@@ -0,0 +1,22 @@
+/**
+ * 
+ */
+package org.gcube.portlets.user.td.expressionwidget.shared.session;
+
+import java.io.Serializable;
+
+import org.gcube.portlets.user.td.gwtservice.shared.OperationMonitor;
+
+/**
+ * 
+ * @author "Giancarlo Panichi" 
+ * <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
+ *
+ */
+public class ColumnFilterMonitor extends OperationMonitor implements Serializable {
+
+	
+	private static final long serialVersionUID = 4722919347946633238L;
+
+			
+}

src/main/java/org/gcube/portlets/user/td/expressionwidget/shared/session/ColumnFilterSession.java

@@ -0,0 +1,33 @@
+package org.gcube.portlets.user.td.expressionwidget.shared.session;
+
+import java.io.Serializable;
+
+import org.gcube.portlets.user.td.gwtservice.shared.tr.ColumnData;
+import org.gcube.portlets.user.td.widgetcommonevent.shared.expression.C_Expression;
+
+public class ColumnFilterSession implements Serializable{
+	
+	private static final long serialVersionUID = -5362632291599472352L;
+	protected ColumnData column;
+	protected C_Expression cexpression;
+	
+	public ColumnData getColumn() {
+		return column;
+	}
+	public void setColumn(ColumnData column) {
+		this.column = column;
+	}
+	public C_Expression getCexpression() {
+		return cexpression;
+	}
+	public void setCexpression(C_Expression cexpression) {
+		this.cexpression = cexpression;
+	}
+	
+	@Override
+	public String toString() {
+		return "ColumnFilterSession [column=" + column + ", cexpression="
+				+ cexpression + "]";
+	}
+	
+}