exceptions management on algorithm input parameters

git-svn-id: https://svn.d4science.research-infrastructures.eu/gcube/trunk/portlets/user/databases-manager-portlet@100094 82a268e6-3cf1-43bd-a215-b396298e98cf

src/main/java/org/gcube/portlets/user/databasesmanager/client/GWTdbManagerService.java

@@ -32,13 +32,13 @@ public interface GWTdbManagerService extends RemoteService {
 			boolean smartCorrectionQuery, String language, String UID)
 			throws Exception;
 
-	SamplingResultWithFileFromServlet sample(LinkedHashMap<String, String> dataInput)
+	SamplingResultWithFileFromServlet sample(LinkedHashMap<String, String> dataInput, String elementType)
 			throws Exception;
 
-	SamplingResultWithFileFromServlet smartSample(LinkedHashMap<String, String> dataInput)
+	SamplingResultWithFileFromServlet smartSample(LinkedHashMap<String, String> dataInput, String elementType)
 			throws Exception;
 
-	SamplingResultWithFileFromServlet randomSample(LinkedHashMap<String, String> dataInput)
+	SamplingResultWithFileFromServlet randomSample(LinkedHashMap<String, String> dataInput, String elementType)
 			throws Exception;
 
 	List<Row> parseCVSString(List<Result> result, List<String> attrNames)
@@ -48,7 +48,7 @@ public interface GWTdbManagerService extends RemoteService {
 			LinkedHashMap<String, String> dataInput) throws Exception;
 
 	PagingLoadResult<Result> LoadTables(PagingLoadConfig config,
-			LinkedHashMap<String, String> dataInput, boolean SearchTable,
+			LinkedHashMap<String, String> dataInput,  String elementType, boolean SearchTable,
 			String keyword) throws Exception;
 
 	PagingLoadResult<Row> loadSubmitResult(PagingLoadConfig config,

src/main/java/org/gcube/portlets/user/databasesmanager/client/GWTdbManagerServiceAsync.java

@@ -31,20 +31,20 @@ public interface GWTdbManagerServiceAsync {
 	void parseCVSString(List<Result> result, List<String> attrNames,
 			AsyncCallback<List<Row>> callback);
 
-	void sample(LinkedHashMap<String, String> dataInput,
+	void sample(LinkedHashMap<String, String> dataInput, String elementType,
 			AsyncCallback<SamplingResultWithFileFromServlet> callback);
 
 	void getTableDetails(LinkedHashMap<String, String> dataInput,
 			AsyncCallback<LinkedHashMap<String, FileModel>> callback);
 
-	void smartSample(LinkedHashMap<String, String> dataInput,
+	void smartSample(LinkedHashMap<String, String> dataInput, String elementType,
 			AsyncCallback<SamplingResultWithFileFromServlet> callback);
 
-	void randomSample(LinkedHashMap<String, String> dataInput,
+	void randomSample(LinkedHashMap<String, String> dataInput, String elementType,
 			AsyncCallback<SamplingResultWithFileFromServlet> callback);
 
 	void LoadTables(PagingLoadConfig config,
-			LinkedHashMap<String, String> dataInput, boolean SearchTable,
+			LinkedHashMap<String, String> dataInput,  String elementType, boolean SearchTable,
 			String keyword, AsyncCallback<PagingLoadResult<Result>> callback);
 
 	void removeComputation(String uidSubmitQuery,

src/main/java/org/gcube/portlets/user/databasesmanager/client/panels/GxtBorderLayoutPanel.java

@@ -102,7 +102,7 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 	private Dialog tablesLoaded = null;
 	// to keep track of selected table in the tables list
 	private String selectedTable = "";
-	private String currentselectedTable="";
+	private String currentselectedTable = "";
 	private FileModel table = new FileModel("");
 	// variables to perform the table search
 	private String keyword = "";
@@ -238,7 +238,7 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 
 						// clean variable
 						selectedTable = "";
-						currentselectedTable="";
+						currentselectedTable = "";
 
 						if (DepthSelectedItem != 3) {
 							centerUpper.removeAll();
@@ -334,10 +334,10 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 	// method to load the tables list
 	private void loadTables() {
 		// clean variable
-//		selectedTable = null;
+		// selectedTable = null;
 
 		// disable table details and sampling buttons
-//		toolbar.disableButtonsOperationsOnTable();
+		// toolbar.disableButtonsOperationsOnTable();
 		// clear the panel
 		// centerBottom.removeAll();
 		// centerBottom.layout(true);
@@ -353,6 +353,8 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 		String database = "";
 		String schema = "";
 
+		final String elementType;
+
 		if (element.isDatabase()) { // the selected item is a database
 			rootLogger.log(Level.INFO, "selected element is a database ");
 			database = element.getName();
@@ -361,6 +363,7 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 			dataInput.put("ResourceName", resource);
 			dataInput.put("DatabaseName", database);
 			dataInput.put("SchemaName", "");
+			elementType = ConstantsPortlet.DATABASE;
 		} else { // the selected item is a schema
 			rootLogger.log(Level.INFO, "selected element is a schema ");
 			FileModel db = treePanel.getTreeStore().getParent(element);
@@ -371,6 +374,7 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 			dataInput.put("ResourceName", resource);
 			dataInput.put("DatabaseName", database);
 			dataInput.put("SchemaName", schema);
+			elementType = ConstantsPortlet.SCHEMA;
 		}
 
 		// print check
@@ -390,7 +394,7 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 						+ startSearchTable);
 				// remote rpc
 				RPCservice.LoadTables((PagingLoadConfig) loadConfig, dataInput,
-						startSearchTable, keyword,
+						elementType, startSearchTable, keyword,
 						new AsyncCallback<PagingLoadResult<Result>>() {
 							@Override
 							public void onFailure(Throwable caught) {
@@ -569,7 +573,6 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 			}
 		});
 
-		
 		// listener to manage the table selection in the grid
 		grid.addListener(Events.RowClick, new Listener<GridEvent<Result>>() {
 			@Override
@@ -582,7 +585,6 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 						grid.getSelectionModel().getSelectedItems().get(0),
 						true);
 
-				
 				// tablesLoaded.addListener(Events.Hide, new
 				// Listener<WindowEvent>() {
 				// @Override
@@ -594,7 +596,6 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 			}
 		});
 
-
 		grid.addListener(Events.BeforeEdit, new Listener<GridEvent<Result>>() {
 			@Override
 			public void handleEvent(final GridEvent<Result> be) {
@@ -684,7 +685,6 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 		Button canc = (Button) tablesLoaded.getButtonBar().getWidget(1);
 		rootLogger.log(Level.INFO, "button: " + canc.getText());
 
-		
 		// listener for buttons
 		ok.addSelectionListener(new SelectionListener<ButtonEvent>() {
 			@Override
@@ -692,8 +692,8 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 				keyword = null;
 				startSearchTable = false;
 
-//				if (selectedTable != null) {
+				// if (selectedTable != null) {
-				if (!currentselectedTable.equals(selectedTable)){
+				if (!currentselectedTable.equals(selectedTable)) {
 					currentselectedTable = selectedTable;
 					// refresh the content in the two panels
 					centerBottom.removeAll();
@@ -728,22 +728,21 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 			}
 		});
 
-		
+		// listener to manage the table selection in the grid
-				
+		grid.getSelectionModel().addSelectionChangedListener(
-				// listener to manage the table selection in the grid
+				new SelectionChangedListener<Result>() {
-				grid.getSelectionModel().addSelectionChangedListener(
+					@Override
-						new SelectionChangedListener<Result>() {
+					public void selectionChanged(
-							@Override
+							SelectionChangedEvent<Result> se) {
-							public void selectionChanged(
+						selectedTable = grid.getSelectionModel()
-									SelectionChangedEvent<Result> se) {
+								.getSelectedItems().get(0).getValue();
-								selectedTable = grid.getSelectionModel()
+						rootLogger.log(Level.INFO,
-										.getSelectedItems().get(0).getValue();
+								"SelectionChangedListener->table selected: "
-								rootLogger.log(Level.INFO, "SelectionChangedListener->table selected: "
 										+ selectedTable);
 
-								ok.enable();
+						ok.enable();
-							}
+					}
-						});
+				});
 		tablesLoaded.add(grid);
 		tablesLoaded.show();
 	}
@@ -877,11 +876,12 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 					}
 
 					@Override
-					public void onSuccess(SubmitQueryResultWithFileFromServlet obj) {
+					public void onSuccess(
+							SubmitQueryResultWithFileFromServlet obj) {
 						rootLogger.log(Level.SEVERE, "SUCCESS RPC submitQuery");
 
-						if (obj != null){
+						if (obj != null) {
-							//get list attributes
+							// get list attributes
 							List<String> listAttributes = obj.getListOutput();
 
 							if (form.getBody().isMasked())
@@ -919,7 +919,8 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 							// return;
 							// }
 
-							rootLogger.log(Level.SEVERE, "SUCCESS RPC submitQuery");
+							rootLogger.log(Level.SEVERE,
+									"SUCCESS RPC submitQuery");
 							rootLogger.log(Level.SEVERE, "output size: "
 									+ listAttributes.size());
 
@@ -952,8 +953,8 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 
 							// get path
 							String fileName = obj.getFileName();
-							parseSubmitQueryResult(form, dialogID, listAttributes, fileName,
+							parseSubmitQueryResult(form, dialogID,
-									UID);
+									listAttributes, fileName, UID);
 
 						}
 
@@ -1169,18 +1170,14 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 		});
 
 		// add the button to download the result
-		final String urlFile = Window.Location
+		final String urlFile = Window.Location.getProtocol() + "//"
-				.getProtocol()
-				+ "//"
 				+ Window.Location.getHost() + fileName;
 
 		Button download = new Button("Download",
 				new SelectionListener<ButtonEvent>() {
 					@Override
-					public void componentSelected(
+					public void componentSelected(ButtonEvent ce) {
-							ButtonEvent ce) {
+						Window.open(urlFile, "Result File", "_blank");
-						Window.open(urlFile, "Result File",
-								"_blank");
 					}
 				});
 		submitResult.addButton(download);
@@ -1205,6 +1202,8 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 		FileModel database;
 		FileModel resource;
 
+		String elementType;
+		
 		if (selectedItem.isDatabase()) {
 			// the table has not a schema because the selected item is a
 			// database
@@ -1220,6 +1219,8 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 			rootLogger.log(Level.INFO, "DatabaseName: " + database.getName());
 			rootLogger.log(Level.INFO, "SchemaName: " + "");
 			rootLogger.log(Level.INFO, "TableName: " + currentselectedTable);
+			
+			elementType = ConstantsPortlet.DATABASE;
 		} else {
 			// the table has a schema because the selected item is a schema
 			schema = selectedItem;
@@ -1235,13 +1236,15 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 			rootLogger.log(Level.INFO, "DatabaseName: " + database.getName());
 			rootLogger.log(Level.INFO, "SchemaName: " + schema.getName());
 			rootLogger.log(Level.INFO, "TableName: " + currentselectedTable);
+			
+			elementType = ConstantsPortlet.SCHEMA;
 		}
 
 		// to mask the entire content panel
 		obj.mask("Sampling the table", "x-mask-loading");
 
 		// call remote service
-		RPCservice.sample(dataInput,
+		RPCservice.sample(dataInput, elementType,
 				new AsyncCallback<SamplingResultWithFileFromServlet>() {
 					@Override
 					public void onFailure(Throwable caught) {
@@ -1341,6 +1344,8 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 		FileModel database;
 		FileModel resource;
 		
+		String elementType;
+		
 		if (selectedItem.isDatabase()) {
 			// the table has not a schema
 			database = selectedItem;
@@ -1355,6 +1360,7 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 			rootLogger.log(Level.INFO, "DatabaseName: " + database.getName());
 			rootLogger.log(Level.INFO, "SchemaName: " + "");
 			rootLogger.log(Level.INFO, "TableName: " + currentselectedTable);
+			elementType=ConstantsPortlet.DATABASE;
 		} else {
 			// the table has a schema
 			schema = selectedItem;
@@ -1370,12 +1376,13 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 			rootLogger.log(Level.INFO, "DatabaseName: " + database.getName());
 			rootLogger.log(Level.INFO, "SchemaName: " + schema.getName());
 			rootLogger.log(Level.INFO, "TableName: " + currentselectedTable);
+			elementType=ConstantsPortlet.SCHEMA;
 		}
 		// to mask the entire content panel
 		obj.mask("Sampling the table", "x-mask-loading");
 
 		// call remote service
-		RPCservice.smartSample(dataInput,
+		RPCservice.smartSample(dataInput, elementType,
 				new AsyncCallback<SamplingResultWithFileFromServlet>() {
 					@Override
 					public void onFailure(Throwable caught) {
@@ -1438,6 +1445,8 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 		FileModel database;
 		FileModel resource;
 
+		String elementType;
+		
 		if (selectedItem.isDatabase()) {
 			// the table has not a schema
 			database = selectedItem;
@@ -1452,6 +1461,7 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 			rootLogger.log(Level.INFO, "DatabaseName: " + database.getName());
 			rootLogger.log(Level.INFO, "SchemaName: " + "");
 			rootLogger.log(Level.INFO, "TableName: " + currentselectedTable);
+			elementType = ConstantsPortlet.DATABASE;
 		} else {
 			// the table has a schema
 			schema = selectedItem;
@@ -1467,13 +1477,14 @@ public class GxtBorderLayoutPanel extends ContentPanel {
 			rootLogger.log(Level.INFO, "DatabaseName: " + database.getName());
 			rootLogger.log(Level.INFO, "SchemaName: " + schema.getName());
 			rootLogger.log(Level.INFO, "TableName: " + currentselectedTable);
+			elementType = ConstantsPortlet.SCHEMA;
 		}
 
 		// to mask the entire content panel
 		obj.mask("Sampling the table", "x-mask-loading");
 
 		// call remote service
-		RPCservice.randomSample(dataInput,
+		RPCservice.randomSample(dataInput, elementType,
 				new AsyncCallback<SamplingResultWithFileFromServlet>() {
 					@Override
 					public void onFailure(Throwable caught) {

src/main/java/org/gcube/portlets/user/databasesmanager/client/utils/ConstantsPortlet.java

@@ -20,6 +20,9 @@ public class ConstantsPortlet {
 	public static final String MYSQL = "MYSQL";
 	public static final String NONE = "NONE";
 	
+	//element types
+	public static final String DATABASE="Database";
+	public static final String SCHEMA="Schema";
 	
 	
 	

src/main/java/org/gcube/portlets/user/databasesmanager/server/GWTdbManagerServiceImpl.java

@@ -300,6 +300,10 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 		// print check
 		logger.info("dbmanager-> ResourceName: " + resourceName);
 
+		if ((resourceName == null) || (resourceName.equals(""))) {
+			throw new Exception("Unable to load data");
+		}
+
 		Parameter resource = new Parameter("ResourceName", "", "String", "");
 		inputParameters.add(resource);
 		inputParameters.get(0).setValue(resourceName);
@@ -398,6 +402,13 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 		logger.info("dbmanager-> ResourceName: " + rs);
 		logger.info("dbmanager-> DatabaseName: " + db);
 
+		if ((rs == null) || (rs.equals(""))) {
+			throw new Exception("Unable to load data");
+		}
+		if ((db == null) || (db.equals(""))) {
+			throw new Exception("Unable to load data");
+		}
+
 		// set input parameters
 		Parameter resource = new Parameter("ResourceName", "", "String", "");
 		Parameter database = new Parameter("DatabaseName", "", "String", "");
@@ -484,8 +495,8 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 	}
 
 	// to get tables
-	private List<Result> getTables(LinkedHashMap<String, String> dataInput)
+	private List<Result> getTables(LinkedHashMap<String, String> dataInput,
-			throws Exception {
+			String elementType) throws Exception {
 		// data input
 		List<Parameter> inputParameters = new ArrayList<Parameter>();
 		// data output
@@ -502,6 +513,26 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 		logger.info("dbmanager-> DatabaseName: " + db);
 		logger.info("dbmanager-> SchemaName: " + scm);
 
+		if ((elementType!=null)&&(elementType.equals(ConstantsPortlet.SCHEMA))) {
+			if ((rs==null)||(rs.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((db==null)||(db.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((scm==null)||(scm.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+		}
+		if ((elementType!=null)&&(elementType.equals(ConstantsPortlet.DATABASE))) {
+			if ((rs==null)||(rs.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((db==null)||(db.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+		}
+
 		// set input parameters
 		Parameter resource = new Parameter("ResourceName", "", "String", "");
 		Parameter database = new Parameter("DatabaseName", "", "String", "");
@@ -611,8 +642,8 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 	// to load tables
 	@Override
 	public PagingLoadResult<Result> LoadTables(PagingLoadConfig config,
-			LinkedHashMap<String, String> dataInput, boolean SearchTable,
+			LinkedHashMap<String, String> dataInput, String elementType,
-			String keyword) throws Exception {
+			boolean SearchTable, String keyword) throws Exception {
 
 		// tables' list stored for a user session
 		// ASLSession session =
@@ -654,7 +685,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 		// if (result == null)
 		// result = getTables(dataInput);
 		if (result.size() == 0)
-			result = getTables(dataInput);
+			result = getTables(dataInput, elementType);
 
 		// Create a sublist and add data to list according
 		// to the limit and offset value of the config
@@ -744,6 +775,16 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 		logger.info("dbmanager-> SmartCorrections check: "
 				+ smartCorrectionQuery);
 		
+		if ((rs==null)||(rs.equals(""))){
+			throw new Exception("Unable to load data");
+		}
+		if ((db==null)||(db.equals(""))){
+			throw new Exception("Unable to load data");
+		}
+		if ((query==null)||(query.equals(""))){
+			throw new Exception("Unable to load data");
+		}
+
 		// set input parameters
 		Parameter resource = new Parameter("ResourceName", "", "String", "");
 		Parameter database = new Parameter("DatabaseName", "", "String", "");
@@ -919,7 +960,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 
 	@Override
 	public SamplingResultWithFileFromServlet sample(
-			LinkedHashMap<String, String> dataInput) throws Exception {
+			LinkedHashMap<String, String> dataInput, String elementType) throws Exception {
 		// data input
 		List<Parameter> inputParameters = new ArrayList<Parameter>();
 		// output sample result
@@ -939,6 +980,32 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 		logger.info("dbmanager-> SchemaName: " + scm);
 		logger.info("dbmanager-> TableName: " + tab);
 		
+		if ((elementType!=null)&&(elementType.equals(ConstantsPortlet.SCHEMA))) {
+			if ((rs==null)||(rs.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((db==null)||(db.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((scm==null)||(scm.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((tab==null)||(tab.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+		}
+		if ((elementType!=null)&&(elementType.equals(ConstantsPortlet.DATABASE))) {
+			if ((rs==null)||(rs.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((db==null)||(db.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((tab==null)||(tab.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+		}
+
 		// set input parameters
 		Parameter resource = new Parameter("ResourceName", "", "String", "");
 		Parameter database = new Parameter("DatabaseName", "", "String", "");
@@ -993,7 +1060,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 
 	@Override
 	public SamplingResultWithFileFromServlet smartSample(
-			LinkedHashMap<String, String> dataInput) throws Exception {
+			LinkedHashMap<String, String> dataInput, String elementType) throws Exception {
 		// data input
 		List<Parameter> inputParameters = new ArrayList<Parameter>();
 		// output sample result
@@ -1013,6 +1080,32 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 		logger.info("dbmanager-> SchemaName: " + scm);
 		logger.info("dbmanager-> TableName: " + tab);
 		
+		if ((elementType!=null)&&(elementType.equals(ConstantsPortlet.SCHEMA))) {
+			if ((rs==null)||(rs.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((db==null)||(db.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((scm==null)||(scm.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((tab==null)||(tab.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+		}
+		if ((elementType!=null)&&(elementType.equals(ConstantsPortlet.DATABASE))) {
+			if ((rs==null)||(rs.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((db==null)||(db.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((tab==null)||(tab.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+		}
+
 		// set input parameters
 		Parameter resource = new Parameter("ResourceName", "", "String", "");
 		Parameter database = new Parameter("DatabaseName", "", "String", "");
@@ -1067,7 +1160,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 
 	@Override
 	public SamplingResultWithFileFromServlet randomSample(
-			LinkedHashMap<String, String> dataInput) throws Exception {
+			LinkedHashMap<String, String> dataInput, String elementType) throws Exception {
 
 		// data input
 		List<Parameter> inputParameters = new ArrayList<Parameter>();
@@ -1088,6 +1181,32 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 		logger.info("dbmanager-> SchemaName: " + scm);
 		logger.info("dbmanager-> TableName: " + tab);
 		
+		if ((elementType!=null)&&(elementType.equals(ConstantsPortlet.SCHEMA))) {
+			if ((rs==null)||(rs.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((db==null)||(db.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((scm==null)||(scm.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((tab==null)||(tab.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+		}
+		if ((elementType!=null)&&(elementType.equals(ConstantsPortlet.DATABASE))) {
+			if ((rs==null)||(rs.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((db==null)||(db.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+			if ((tab==null)||(tab.equals(""))){
+				throw new Exception("Unable to load data");
+			}
+		}
+
 		// set input parameters
 		Parameter resource = new Parameter("ResourceName", "", "String", "");
 		Parameter database = new Parameter("DatabaseName", "", "String", "");
@@ -1928,7 +2047,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 										ConstantsPortlet.MYSQL)) { // refresh
 																	// table
 																	// list
-							getTables(inputData);
+							getTables(inputData, ConstantsPortlet.DATABASE);
 
 						}
 						// resourceName = inputData.get("ResourceName");
@@ -1937,7 +2056,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 						break;
 
 					case "schema":
-						getTables(inputData);
+						getTables(inputData, ConstantsPortlet.SCHEMA);
 						break;
 					}
 				}