in progress

src/main/java/org/gcube/portlets/user/geoportaldataentry/client/GeoPortalDataEntryApp.java

@@ -143,6 +143,8 @@ public class GeoPortalDataEntryApp implements EntryPoint {
 
 	private boolean dataEntryProjectCreated = false;
 
+	private TreeItemPanel treeItemPanel;
+
 	/**
 	 * This is the entry point method.
 	 */
@@ -417,18 +419,6 @@ public class GeoPortalDataEntryApp implements EntryPoint {
 								String theMetaType = metaDataProfileBean.getType().toLowerCase();
 								GWT.log("Building form card for type: " + theMetaType);
 
-//								// Managing Forms repeatability
-//								int minOccurs = gcubeProfiles.getMinOccurs();
-//								minOccurs = minOccurs <= 0 ? 0 : minOccurs;
-//								int maxOccurs = gcubeProfiles.getMaxOccurs();
-//								maxOccurs = maxOccurs <= 0 ? Integer.MAX_VALUE : maxOccurs;
-//
-//								// TODO MUST BE MANAGED MIN_OCCURS
-//								ProjectFormCard cct = new ProjectFormCard(gcubeProfiles.getSectionName(),
-//										gcubeProfiles.getSectionTitle(), order, maxOccurs > 1, minOccurs, maxOccurs);
-//								GeoNaFormCardModel geonaForm = new GeoNaFormCardModel(metaDataProfileBean, null, cct,
-//										gcubeProfiles);
-
 								GeoNaFormCardModel geonaForm = buildNewFormCardModelFromProfile(gcubeProfile, order,
 										metaDataProfileBean, OPERATION.UPDATE);
 
@@ -468,6 +458,7 @@ public class GeoPortalDataEntryApp implements EntryPoint {
 	 */
 	private GeoNaFormCardModel buildNewFormCardModelFromProfile(GcubeProfileDV gcubeProfile, int order,
 			MetaDataProfileBean metaDataProfileBean, OPERATION operation) {
+
 		// Managing Forms repeatability
 		int minOccurs = gcubeProfile.getMinOccurs();
 		minOccurs = minOccurs <= 0 ? 0 : minOccurs;
@@ -488,37 +479,16 @@ public class GeoPortalDataEntryApp implements EntryPoint {
 	}
 
 	private void buildNewCards(String profileID, String itemTypeTitle, Collection<GeoNaFormCardModel> orderedCards) {
+
 		projectSavedWithSuccess = false; // resetting state of saving
 		mainTabPanel.setLoaderVisible("Loading...", true);
 		geoNaMainForm.setVisibleFormActions(true);
 		resetUI();
-		// ordered values
-//		for (GeoNaFormCardModel geonaForm : orderedCards) {
-//
-//			// TODO TO TEST
-//			// if(geonaForm.getFormCardTitle().equals(ProjectFormCard.IMMAGINI_RAPPRESENTATIVE)){
-//
-//			GWT.log("Adding card: " + geonaForm.getFormCard());
-//			CreateMetadataForm baseForm = new CreateMetadataForm(Arrays.asList(geonaForm.getMetadataProfileBean()),
-//					appManagerBus, operation);
-//			geonaForm.setMetadataForm(baseForm);
-//			String key = geonaForm.getMetadataProfileBean().getType();
-//			if (geonaForm.getFormCard() != null) {
-//				key = geonaForm.getFormCard().getTitle();
-//			}
-//			// profileID is unique for all the cards/forms
-//			geoNaMainForm.addForm(profileID, key, geonaForm);
-//			mapForms.put(key, geonaForm);
-//
-//			// }
-//		}
-
 		geoNaMainForm.enableButtonSave(true);
 		mainTabPanel.setLoaderVisible("", false);
 
-		TreeItemPanel tip = new TreeItemPanel(profileID, itemTypeTitle, orderedCards, appManagerBus);
+		treeItemPanel = new TreeItemPanel(profileID, itemTypeTitle, orderedCards, appManagerBus);
-		geoNaMainForm.addTree(tip);
+		geoNaMainForm.addTree(treeItemPanel);
-		// RootPanel.get(GeoPortalDataEntryApp.DIV_PORTLET_ID).add(tip.getTree());
 	}
 
 	private void resetUI() {
@@ -1130,8 +1100,9 @@ public class GeoPortalDataEntryApp implements EntryPoint {
 //		geoNaMainForm.getTreeItemPanel().createAndAddChild(theRootNode.getParentTreeItem(), newNodeFormCard,
 //				canBeDuplicated, true, theRootNode.getJsonSectionFullPath());
 
-		TreeItem newTreeItem = new TreeItem(new NodeItem(root.getParentItem(), newNodeFormCard, canBeDuplicated, true,
+		TreeItem newTreeItem = new TreeItem(
-				theRootNode.getJsonSectionFullPath()));
+				new NodeItem(root.getParentItem(), nodeCard.getGcubeProfile().getSectionTitle(), newNodeFormCard,
+						canBeDuplicated, true, theRootNode.getJsonSectionFullPath()));
 		String parentText = root.getParentItem() != null ? root.getParentItem().getText() : null;
 		GWT.log("newTreeItem created: " + newTreeItem.getText() + ", parent is: " + parentText);
 

src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/form/GeonaDataEntryMainForm.java

@@ -9,8 +9,10 @@ import org.gcube.portlets.user.geoportaldataentry.client.events.TreeItemEvent;
 import org.gcube.portlets.user.geoportaldataentry.client.events.TreeItemEvent.ACTION;
 import org.gcube.portlets.user.geoportaldataentry.client.ui.card.GeoNaFormCardModel;
 import org.gcube.portlets.user.geoportaldataentry.client.ui.card.MetadataFormCard;
+import org.gcube.portlets.user.geoportaldataentry.client.ui.tree.NodeItem;
 import org.gcube.portlets.user.geoportaldataentry.client.ui.tree.TreeItemPanel;
 import org.gcube.portlets.user.geoportaldataentry.shared.GeoNaFormDataObject;
+import org.gcube.portlets.user.geoportaldataentry.shared.TNode;
 import org.gcube.portlets.widgets.mpformbuilder.client.form.generic.CreateMetadataForm;
 import org.gcube.portlets.widgets.mpformbuilder.shared.GenericDatasetBean;
 
@@ -32,6 +34,7 @@ import com.google.gwt.user.client.Timer;
 import com.google.gwt.user.client.ui.Composite;
 import com.google.gwt.user.client.ui.HTMLPanel;
 import com.google.gwt.user.client.ui.ScrollPanel;
+import com.google.gwt.user.client.ui.TreeItem;
 import com.google.gwt.user.client.ui.Widget;
 
 /**
@@ -55,7 +58,7 @@ public class GeonaDataEntryMainForm extends Composite {
 	interface GeonaDataEntryMainFormUiBinder extends UiBinder<Widget, GeonaDataEntryMainForm> {
 	}
 
-	private List<GeoNaFormCardModel> listCards = new ArrayList<GeoNaFormCardModel>();
+	private TNode<GeoNaFormCardModel> nodes = new TNode<GeoNaFormCardModel>();
 
 	@UiField
 	HTMLPanel mainHTMLPanel;
@@ -69,9 +72,6 @@ public class GeonaDataEntryMainForm extends Composite {
 	@UiField
 	ScrollPanel inputPanel;
 
-//	@UiField
-//	TabPanel mainTabPanel;
-
 	@UiField
 	AlertBlock alertFormAction;
 
@@ -89,14 +89,14 @@ public class GeonaDataEntryMainForm extends Composite {
 
 	private LinkedHashMap<String, MetadataFormCard> mapForms = new LinkedHashMap<String, MetadataFormCard>();
 
-	//private List<Tab> listTabs = new ArrayList<Tab>();
-
 	private HandlerManager appManagerBus;
 
 	private String profileID;
 
 	private TreeItemPanel treeItemPanel;
 
+	private boolean canSave = true;
+
 	/**
 	 * Instantiates a new geona data entry main form.
 	 *
@@ -155,54 +155,17 @@ public class GeonaDataEntryMainForm extends Composite {
 		inputPanel.add(form);
 	}
 
-//	/**
-//	 * Adds the form.
-//	 *
-//	 * @param tabHeading    the tab heading
-//	 * @param key 
-//	 * @param geonFormModel the geon form model
-//	 */
-//	public void addForm(String profileID, String tabHeading, GeoNaFormCardModel geonFormModel) {
-//		this.profileID = profileID;
-//		listCards.add(geonFormModel);
-//		createNewCard(profileID, tabHeading, geonFormModel);
-//	}
-
-//	/**
-//	 * Creates the new card.
-//	 *
-//	 * @param profileID     the profile ID
-//	 * @param tabHeading    the tab heading
-//	 * @param geonFormModel the geon form model
-//	 */
-//	private void createNewCard(String profileID, String tabHeading, final GeoNaFormCardModel geonFormModel) {
-//		final Tab tab = new Tab();
-//		tab.setHeading(tabHeading);
-//		// MetadataFormCard mfc = new MetadataFormCard(tab, createMetadataForm,
-//		// repeatible);
-//		MetadataFormCard mfc = new MetadataFormCard(tab, geonFormModel, appManagerBus);
-//		listTabs.add(tab);
-//		mainTabPanel.add(tab);
-//
-//		if (listTabs.size() == 1) {
-//			tab.setActive(true);
-//			mainTabPanel.selectTab(0);
-//		}
-//
-//		mapForms.put(tabHeading, mfc);
-//	}
-
 	/**
 	 * Reset.
 	 */
 	public void resetUI() {
 		navbarTree.setVisible(false);
 		mapForms.clear();
-		//mainTabPanel.clear();
+		// mainTabPanel.clear();
 		inputPanel.clear();
-		//listTabs.clear();
+		// listTabs.clear();
 	}
-	
+
 	/**
 	 * Reset.
 	 */
@@ -210,20 +173,44 @@ public class GeonaDataEntryMainForm extends Composite {
 		inputPanel.clear();
 	}
 
-//	/**
+	public void validateFormsIntoTree(TreeItem root) {
-//	 * Select tab.
+		GWT.log("validateFormsIntoTree called");
-//	 *
+
-//	 * @param index the index
+		if (root == null) {
-//	 */
+			return;
-//	public void selectTab(int index) {
+		}
-//
+
-//		GWT.log("Selecting tab index: " + index + " of " + listTabs.size());
+		GWT.log("validateFormsIntoTree called for: " + root.getText());
-//
+		
-//		if (listTabs.size() < index) {
+		for (int i = 0; i < root.getChildCount(); i++) {
-//			mainTabPanel.selectTab(index);
+			TreeItem child = root.getChild(i);
-//
+			validateFormsIntoTree(child);
+		}
+		
+		NodeItem node = (NodeItem) root.getWidget();
+		GWT.log("validateFormsIntoTree called for: " + root.getText() + " node: " + node);
+
+		//Is root
+		if (node == null) {
+			return;
+		}
+
+//		try {
+//			node = (NodeItem) root.getWidget();
+//			boolean isRoot = node.isRoot();
+//			if(isRoot)
+//				return true;
+//		}catch (Exception e) {
+//			// TODO: handle exception
 //		}
-//	}
+
+		boolean isValid = node.validateForm();
+		GWT.log("validateFormsIntoTree called for: " + root.getText() + " is valid: " + isValid);
+
+		if (!isValid) {
+			canSave = false;
+		}
+	}
 
 	/**
 	 * Save data.
@@ -233,29 +220,46 @@ public class GeonaDataEntryMainForm extends Composite {
 	@UiHandler("buttonSave")
 	void saveData(ClickEvent e) {
 
-		boolean canSave = true;
+		canSave = true;
+		TreeItem root = treeItemPanel.getRoot();
+		validateFormsIntoTree(root);
 
-		for (String metadataType : mapForms.keySet()) {
+//		boolean canSave = true;
-			MetadataFormCard card = mapForms.get(metadataType);
+//		
-			boolean isValid = card.validateForm();
+//		TreeItem root = treeItemPanel.getRoot();
-			card.setValidCard(isValid);
+//		
-			if (isValid == false)
+//		for (int i=0; i<root.getChildCount(); i++) {
-				canSave = false;
+//			TreeItem child = root.getChild(i);
-		}
+//			NodeItem node = (NodeItem) child.getWidget();
+//			boolean isValid = node.validateForm();
+//			if (isValid == false)
+//				canSave = false;
+//		}
+//
+//		for (String metadataType : mapForms.keySet()) {
+//			MetadataFormCard card = mapForms.get(metadataType);
+//			boolean isValid = card.validateForm();
+//			card.setValidCard(isValid);
+//			if (isValid == false)
+//				canSave = false;
+//		}
 
 		List<GeoNaFormDataObject> listGeonaFormObjects = new ArrayList<GeoNaFormDataObject>();
 
 		if (canSave) {
-			for (String metadataType : mapForms.keySet()) {
+//			for (String metadataType : mapForms.keySet()) {
-				MetadataFormCard card = mapForms.get(metadataType);
+//				MetadataFormCard card = mapForms.get(metadataType);
-				List<GenericDatasetBean> listGDB = new ArrayList<GenericDatasetBean>(card.getListForms().size());
+//				List<GenericDatasetBean> listGDB = new ArrayList<GenericDatasetBean>(card.getListForms().size());
-				for (CreateMetadataForm form : card.getListForms()) {
+//				for (CreateMetadataForm form : card.getListForms()) {
-					listGDB.add(form.getFormDataBean());
+//					listGDB.add(form.getFormDataBean());
+//
+//				}
+//				listGeonaFormObjects.add(new GeoNaFormDataObject(listGDB, card.getGeonaFormModel().getGcubeProfile()));
+//			}
+//			appManagerBus.fireEvent(new SaveGeonaDataFormsEvent(profileID, listGeonaFormObjects));
+
+			showAlertOnSaveAction("Andiamo a salvare", AlertType.INFO, true);
 
-				}
-				listGeonaFormObjects.add(new GeoNaFormDataObject(listGDB, card.getGeonaFormModel().getGcubeProfile()));
-			}
-			appManagerBus.fireEvent(new SaveGeonaDataFormsEvent(profileID, listGeonaFormObjects));
 		} else {
 			showAlertOnSaveAction("Detected errors, please fix it/them", AlertType.ERROR, true);
 		}

src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/tree/NodeItem.java

@@ -1,8 +1,12 @@
 package org.gcube.portlets.user.geoportaldataentry.client.ui.tree;
 
 import org.gcube.portlets.user.geoportaldataentry.client.ui.card.GeoNaFormCardModel;
+import org.gcube.portlets.widgets.mpformbuilder.client.form.generic.CreateMetadataForm;
+import org.gcube.portlets.widgets.mpformbuilder.client.form.generic.GenericFormEvents.GenericFormEventsListener;
+import org.gcube.portlets.widgets.mpformbuilder.shared.GenericDatasetBean;
 
 import com.github.gwtbootstrap.client.ui.Button;
+import com.github.gwtbootstrap.client.ui.Icon;
 import com.github.gwtbootstrap.client.ui.constants.IconType;
 import com.google.gwt.core.client.GWT;
 import com.google.gwt.event.dom.client.ClickEvent;
@@ -21,6 +25,9 @@ public class NodeItem extends Composite {
 	interface NodeItemUiBinder extends UiBinder<Widget, NodeItem> {
 	}
 
+	@UiField
+	Icon iconField;
+
 	@UiField
 	HTML htmlNode;
 
@@ -40,7 +47,11 @@ public class NodeItem extends Composite {
 
 	private boolean canBeDeleted;
 
-	public NodeItem(TreeItem parent, GeoNaFormCardModel geoNaFormCardModel, boolean canBeDuplicated,
+	private boolean isRoot = false;
+
+	private MetadataFormCardEventHandler formCardEventHandler = new MetadataFormCardEventHandler();
+
+	public NodeItem(TreeItem parent, String nodeHTML, GeoNaFormCardModel geoNaFormCardModel, boolean canBeDuplicated,
 			boolean canBeDeleted, String jsonSectionFullPath) {
 		initWidget(uiBinder.createAndBindUi(this));
 		this.geoNaFormCardModel = geoNaFormCardModel;
@@ -48,13 +59,13 @@ public class NodeItem extends Composite {
 		this.jsonSectionFullPath = jsonSectionFullPath;
 		this.canBeDuplicated = canBeDuplicated;
 		this.canBeDeleted = canBeDeleted;
-		htmlNode.setHTML(geoNaFormCardModel.getGcubeProfile().getSectionTitle());
+		htmlNode.setHTML(nodeHTML);
 		buttonAdd.setVisible(false);
 		buttonRemove.setVisible(false);
 
 		if (canBeDuplicated) {
 			buttonAdd.setIcon(IconType.COPY);
-			//buttonAdd.getElement().getStyle().setProperty("pointerEvents", "none");
+			// buttonAdd.getElement().getStyle().setProperty("pointerEvents", "none");
 			buttonAdd.getElement().getStyle().setProperty("textDecoration", "none");
 			buttonAdd.getElement().getStyle().setColor("#555");
 			buttonAdd.setVisible(true);
@@ -63,7 +74,7 @@ public class NodeItem extends Composite {
 
 		if (canBeDeleted) {
 			buttonRemove.setIcon(IconType.TRASH);
-			//buttonRemove.getElement().getStyle().setProperty("pointerEvents", "none");
+			// buttonRemove.getElement().getStyle().setProperty("pointerEvents", "none");
 			buttonRemove.getElement().getStyle().setProperty("textDecoration", "none");
 			buttonRemove.getElement().getStyle().setColor("#555");
 			buttonRemove.setVisible(true);
@@ -78,6 +89,128 @@ public class NodeItem extends Composite {
 			}
 		});
 
+		//Is not the root node
+		if(geoNaFormCardModel!=null) {
+			geoNaFormCardModel.getMetadataForm().addListener(formCardEventHandler);
+			resetNodeStatus();
+		}
+	}
+
+	/**
+	 * The Class MetadataFormCardEventHandler.
+	 *
+	 * @author Francesco Mangiacrapa at ISTI-CNR (francesco.mangiacrapa@isti.cnr.it)
+	 * 
+	 *         Oct 12, 2020
+	 */
+	private class MetadataFormCardEventHandler implements GenericFormEventsListener {
+
+		/**
+		 * On form data valid.
+		 *
+		 * @param genericDatasetBean the generic dataset bean
+		 */
+		@Override
+		public void onFormDataValid(GenericDatasetBean genericDatasetBean) {
+			setNodeStatus();
+
+		}
+
+		/**
+		 * On form data edit.
+		 */
+		@Override
+		public void onFormDataEdit() {
+			resetNodeStatus();
+
+		}
+
+		/**
+		 * On form aborted.
+		 */
+		@Override
+		public void onFormAborted() {
+			// TODO Auto-generated method stub
+
+		}
+
+		/**
+		 * On validation error.
+		 *
+		 * @param throwable the throwable
+		 * @param errorMsg  the error msg
+		 */
+		@Override
+		public void onValidationError(Throwable throwable, String errorMsg) {
+			// TODO Auto-generated method stub
+
+		}
+	}
+
+	/**
+	 * Validate form.
+	 *
+	 * @return true, if successful
+	 */
+	public boolean validateForm() {
+		
+		if(isRoot)
+			return true;
+		
+		CreateMetadataForm createMetadataForm = geoNaFormCardModel.getMetadataForm();
+		boolean isFormDataValid = createMetadataForm.isFormDataValid();
+		GWT.log("Is form data valid: " + isFormDataValid);
+		if (!isFormDataValid) {
+			return false;
+		}
+
+		return true;
+	}
+
+	/**
+	 * Sets the valid card.
+	 *
+	 * @param bool the new valid card
+	 */
+	public void setValidCard(boolean bool) {
+		if (bool) {
+			iconField.setIcon(IconType.OK_SIGN);
+			htmlNode.asWidget().getElement().removeClassName("red-text");
+			htmlNode.asWidget().getElement().addClassName("green-text");
+		} else {
+			iconField.setIcon(IconType.MINUS_SIGN);
+			htmlNode.asWidget().getElement().removeClassName("green-text");
+			htmlNode.asWidget().getElement().addClassName("red-text");
+		}
+
+	}
+
+	/**
+	 * Sets the tab status.
+	 */
+	private void setNodeStatus() {
+		boolean isValid = validateForm();
+		if (isValid) {
+			iconField.setIcon(IconType.OK_SIGN);
+			htmlNode.asWidget().getElement().removeClassName("red-text");
+			htmlNode.asWidget().getElement().addClassName("green-text");
+		} else {
+			iconField.setIcon(IconType.MINUS_SIGN);
+			htmlNode.asWidget().getElement().removeClassName("red-text");
+			htmlNode.asWidget().getElement().addClassName("red-text");
+		}
+	}
+
+	public boolean isRoot() {
+		return isRoot;
+	}
+
+	public void setRoot(boolean isRoot) {
+		this.isRoot = isRoot;
+	}
+
+	private void resetNodeStatus() {
+		iconField.setIcon(null);
 	}
 
 	public TreeItem getParentTreeItem() {
@@ -104,7 +237,7 @@ public class NodeItem extends Composite {
 	public boolean isCanBeDuplicated() {
 		return canBeDuplicated;
 	}
-	
+
 	public HTML getHtmlNode() {
 		return htmlNode;
 	}

src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/tree/NodeItem.ui.xml

@@ -8,11 +8,18 @@
 		margin-left: 20px;
 	}
 	
+	.margin-left-10 {
+		margin-left: 10px;
+	}
+	
 	.margin-left-10 {
 		margin-left: 10px;
 	}
 	</ui:style>
 	<g:HorizontalPanel>
+		<g:HTMLPanel addStyleNames="margin-left-10">
+			<b:Icon type="OK_SIGN" ui:field="iconField"></b:Icon>
+		</g:HTMLPanel>
 		<g:HTML ui:field="htmlNode">Node</g:HTML>
 		<b:Button title="This section can be duplicated"
 			styleName="{style.margin-left-10}" ui:field="buttonAdd"></b:Button>

src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/tree/TreeItemPanel.java

@@ -22,7 +22,7 @@ public class TreeItemPanel {
 
 	private static final String JSON_ROOT_PATH = "$.";
 	private Tree tree = new Tree();
-	private TreeItem root = new TreeItem();
+	private TreeItem root;
 	private HandlerManager appManagerBus;
 	private HashMap<String, List<TreeItem>> treeItemParents = new HashMap<String, List<TreeItem>>();
 	private String itemTypeTitle;
@@ -35,7 +35,12 @@ public class TreeItemPanel {
 		this.itemTypeTitle = itemTypeTitle;
 		this.profileID = profileID;
 		tree.setAnimationEnabled(true);
+		
+		NodeItem rootNode = new NodeItem(null, "root", null, false, false, JSON_ROOT_PATH);
+		rootNode.setRoot(true);
+		root = new TreeItem(rootNode);
 		root.setHTML(itemTypeTitle);
+		
 
 		// TreeMap<String, List<TreeItem>> mapParentSections = new TreeMap<String,
 		// List<TreeItem>>();
@@ -80,7 +85,7 @@ public class TreeItemPanel {
 					+ profile.getSectionName() + " title: " + profile.getSectionTitle());
 
 			boolean canBeDuplicated = geoNaFormCardModel.getFormCard().isInternalRepeatibleForm();
-			TreeItem child = createAndAddChild(listParent.get(0), geoNaFormCardModel, canBeDuplicated, false,
+			TreeItem child = createAndAddChild(listParent.get(0), profile.getSectionTitle(), geoNaFormCardModel, canBeDuplicated, false,
 					jsonSectionFullPath);
 
 		}
@@ -124,10 +129,10 @@ public class TreeItemPanel {
 		return jsonSectionFullPath;
 	}
 
-	public TreeItem createAndAddChild(TreeItem parent, GeoNaFormCardModel geoNaFormCardModel, boolean canBeDuplicated,
+	public TreeItem createAndAddChild(TreeItem parent, String nodeHTML, GeoNaFormCardModel geoNaFormCardModel, boolean canBeDuplicated,
 			boolean canBeDeleted, String jsonSectionFullPath) {
 		GWT.log("Creating and adding child to parent: " + parent.getText());
-		TreeItem newChild = new TreeItem(new NodeItem(parent, geoNaFormCardModel, canBeDuplicated, canBeDeleted, jsonSectionFullPath));
+		TreeItem newChild = new TreeItem(new NodeItem(parent, nodeHTML, geoNaFormCardModel, canBeDuplicated, canBeDeleted, jsonSectionFullPath));
 		parent.addItem(newChild);
 
 		fillItemParents(jsonSectionFullPath, newChild);

src/main/java/org/gcube/portlets/user/geoportaldataentry/shared/TNode.java

@@ -1,5 +1,6 @@
 package org.gcube.portlets.user.geoportaldataentry.shared;
 
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -11,11 +12,19 @@ import java.util.List;
  *         Jul 6, 2022
  * @param <T> the generic type
  */
-public class TNode<T> {
+public class TNode<T> implements Serializable {
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = -7319055031988865761L;
 	private T data;
 	private List<TNode<T>> children;
 	private TNode<T> parent;
 
+	public TNode() {
+
+	}
+
 	/**
 	 * Instantiates a new node.
 	 *