Examples of com.vaadin.ui.UI

com.vaadin.ui.UI
The topmost component in any component hierarchy. There is one UI for every Vaadin instance in a browser window. A UI may either represent an entire browser window (or tab) or some part of a html page where a Vaadin application is embedded.
The UI is the server side entry point for various client side features that are not represented as components added to a layout, e.g notifications, sub windows, and executing javascript in the browser.

When a new UI instance is needed, typically because the user opens a URL in a browser window which points to e.g. {@link VaadinServlet}, all {@link UIProvider}s registered to the current {@link VaadinSession} arequeried for the UI class that should be used. The selection is by default based on the UI init parameter from web.xml.

After a UI has been created by the application, it is initialized using {@link #init(VaadinRequest)}. This method is intended to be overridden by the developer to add components to the user interface and initialize non-component functionality. The component hierarchy must be initialized by passing a {@link Component} with the main layout or other content of the viewto {@link #setContent(Component)} or to the constructor of the UI.
@see #init(VaadinRequest) @see UIProvider @since 7.0

        String uiId = matcher.group(1);
        String cid = matcher.group(2);
        String key = matcher.group(3);


        session.lock();
        UI ui;
        ClientConnector connector;
        try {
            ui = session.getUIById(Integer.parseInt(uiId));
            if (ui == null) {
                return error(request, response,
                        "Ignoring connector request for no-existent root "
                                + uiId);
            }


            connector = ui.getConnectorTracker().getConnector(cid);
            if (connector == null) {
                return error(request, response,
                        "Ignoring connector request for no-existent connector "
                                + cid + " in root " + uiId);
            }

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                .getPortletRequest();
        PortletResponse portletResponse = ((VaadinPortletResponse) response)
                .getPortletResponse();


        // Finds the right UI
        UI uI = null;
        if (ServletPortletHelper.isUIDLRequest(request)) {
            uI = session.getService().findUI(request);
        }


        if (portletRequest instanceof RenderRequest) {

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        ClientConnector source;
        StreamVariable streamVariable;


        session.lock();
        try {
            UI uI = session.getUIById(Integer.parseInt(uiId));
            UI.setCurrent(uI);


            streamVariable = uI.getConnectorTracker().getStreamVariable(
                    connectorId, variableName);
            String secKey = uI.getConnectorTracker().getSeckey(streamVariable);
            if (!secKey.equals(parts[3])) {
                // TODO Should rethink error handling
                return true;
            }

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     * @deprecated As of 7.1. See #11411.
     */
    @Deprecated
    public static JSONObject encodeState(ClientConnector connector,
            SharedState state) throws JSONException {
        UI uI = connector.getUI();
        ConnectorTracker connectorTracker = uI.getConnectorTracker();
        Class<? extends SharedState> stateType = connector.getStateType();
        Object diffState = connectorTracker.getDiffState(connector);
        boolean supportsDiffState = !JavaScriptConnectorState.class
                .isAssignableFrom(stateType);
        if (diffState == null && supportsDiffState) {
            // Use an empty state object as reference for full
            // repaints


            try {
                SharedState referenceState = stateType.newInstance();
                EncodeResult encodeResult = JsonCodec.encode(referenceState,
                        null, stateType, uI.getConnectorTracker());
                diffState = encodeResult.getEncodedValue();
            } catch (Exception e) {
                getLogger()
                        .log(Level.WARNING,
                                "Error creating reference object for state of type {0}",
                                stateType.getName());
            }
        }
        EncodeResult encodeResult = JsonCodec.encode(state, diffState,
                stateType, uI.getConnectorTracker());
        if (supportsDiffState) {
            connectorTracker.setDiffState(connector,
                    (JSONObject) encodeResult.getEncodedValue());
        }
        return (JSONObject) encodeResult.getDiff();

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         * 
         * NAME and PID from URI forms a key to fetch StreamVariable when
         * handling post
         */
        String paintableId = owner.getConnectorId();
        UI ui = owner.getUI();
        int uiId = ui.getUIId();
        String key = uiId + "/" + paintableId + "/" + name;


        ConnectorTracker connectorTracker = ui.getConnectorTracker();
        connectorTracker.addStreamVariable(paintableId, name, value);
        String seckey = connectorTracker.getSeckey(value);


        return ApplicationConstants.APP_PROTOCOL_PREFIX
                + ServletPortletHelper.UPLOAD_URL_PREFIX + key + "/" + seckey;

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    public boolean synchronizedHandleRequest(VaadinSession session,
            VaadinRequest request, VaadinResponse response) throws IOException {
        if (!ServletPortletHelper.isUIDLRequest(request)) {
            return false;
        }
        UI uI = session.getService().findUI(request);
        if (uI == null) {
            // This should not happen but it will if the UI has been closed. We
            // really don't want to see it in the server logs though
            response.getWriter().write(
                    getUINotFoundErrorJSON(session.getService(), request));

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     * 
     * @return the current page instance if available, otherwise
     *         <code>null</code>
     */
    public static Page getCurrent() {
        UI currentUI = UI.getCurrent();
        if (currentUI == null) {
            return null;
        }
        return currentUI.getPage();
    }

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        }
    }


    public static JSONObject encodeState(ClientConnector connector,
            SharedState state) throws JSONException {
        UI uI = connector.getUI();
        ConnectorTracker connectorTracker = uI.getConnectorTracker();
        Class<? extends SharedState> stateType = connector.getStateType();
        Object diffState = connectorTracker.getDiffState(connector);
        boolean supportsDiffState = !JavaScriptConnectorState.class
                .isAssignableFrom(stateType);
        if (diffState == null && supportsDiffState) {
            // Use an empty state object as reference for full
            // repaints


            try {
                SharedState referenceState = stateType.newInstance();
                EncodeResult encodeResult = JsonCodec.encode(referenceState,
                        null, stateType, uI.getConnectorTracker());
                diffState = encodeResult.getEncodedValue();
            } catch (Exception e) {
                getLogger()
                        .log(Level.WARNING,
                                "Error creating reference object for state of type {0}",
                                stateType.getName());
            }
        }
        EncodeResult encodeResult = JsonCodec.encode(state, diffState,
                stateType, uI.getConnectorTracker());
        if (supportsDiffState) {
            connectorTracker.setDiffState(connector,
                    (JSONObject) encodeResult.getEncodedValue());
        }
        return (JSONObject) encodeResult.getDiff();

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         * 
         * NAME and PID from URI forms a key to fetch StreamVariable when
         * handling post
         */
        String paintableId = owner.getConnectorId();
        UI ui = owner.getUI();
        int uiId = ui.getUIId();
        String key = uiId + "/" + paintableId + "/" + name;


        ConnectorTracker connectorTracker = ui.getConnectorTracker();
        connectorTracker.addStreamVariable(paintableId, name, value);
        String seckey = connectorTracker.getSeckey(value);


        return ApplicationConstants.APP_PROTOCOL_PREFIX
                + ServletPortletHelper.UPLOAD_URL_PREFIX + key + "/" + seckey;

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        try {
            assert UI.getCurrent() == null;


            response.setContentType("application/json; charset=UTF-8");


            UI uI = getBrowserDetailsUI(request, session);


            JSONObject params = new JSONObject();
            params.put(UIConstants.UI_ID_PARAMETER, uI.getUIId());
            String initialUIDL = getInitialUIDL(request, uI);
            params.put("uidl", initialUIDL);


            // NOTE! GateIn requires, for some weird reason, getOutputStream
            // to be used instead of getWriter() (it seems to interpret

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