vaadin-framework/src/com/itmill/toolkit/terminal/gwt/client/ApplicationConnection.java

/* 
@ITMillApache2LicenseForJavaFiles@
 */

package com.itmill.toolkit.terminal.gwt.client;

import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Vector;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;
import com.google.gwt.json.client.JSONArray;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONString;
import com.google.gwt.json.client.JSONValue;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.DeferredCommand;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.WindowCloseListener;
import com.google.gwt.user.client.ui.FocusWidget;
import com.google.gwt.user.client.ui.HasFocus;
import com.google.gwt.user.client.ui.HasWidgets;
import com.google.gwt.user.client.ui.Widget;
import com.itmill.toolkit.terminal.gwt.client.ui.ContextMenu;
import com.itmill.toolkit.terminal.gwt.client.ui.Field;
import com.itmill.toolkit.terminal.gwt.client.ui.IView;
import com.itmill.toolkit.terminal.gwt.client.ui.Notification;
import com.itmill.toolkit.terminal.gwt.client.ui.Notification.HideEvent;

/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
public class ApplicationConnection {
    private static final String MODIFIED_CLASSNAME = "i-modified";

    private static final String REQUIRED_CLASSNAME_EXT = "-required";

    private static final String ERROR_CLASSNAME_EXT = "-error";

    public static final String VAR_RECORD_SEPARATOR = "\u001e";

    public static final String VAR_FIELD_SEPARATOR = "\u001f";

    private final HashMap resourcesMap = new HashMap();

    private static Console console;

    private static boolean testingMode;

    private final Vector pendingVariables = new Vector();

    private final HashMap idToPaintable = new HashMap();

    private final HashMap paintableToId = new HashMap();

    /** Contains ExtendedTitleInfo by paintable id */
    private final HashMap paintableToTitle = new HashMap();

    private final WidgetSet widgetSet;

    private ContextMenu contextMenu = null;

    private Timer loadTimer;
    private Timer loadTimer2;
    private Timer loadTimer3;
    private Element loadElement;

    private final IView view;

    private boolean applicationRunning = false;

    /**
     * True if each Paintable objects id is injected to DOM. Used for Testing
     * Tools.
     */
    private boolean usePaintableIdsInDOM = false;

    /**
     * Contains reference for client wrapper given to Testing Tools.
     * 
     * Used in JSNI functions
     * 
     * @SuppressWarnings
     */
    private final JavaScriptObject ttClientWrapper = null;

    private int activeRequests = 0;

    private final ApplicationConfiguration configuration;

    private final Vector pendingVariableBursts = new Vector();

    public ApplicationConnection(WidgetSet widgetSet,
            ApplicationConfiguration cnf) {
        this.widgetSet = widgetSet;
        configuration = cnf;

        if (isDebugMode()) {
            console = new DebugConsole(this, cnf);
        } else {
            console = new NullConsole();
        }

        if (checkTestingMode()) {
            usePaintableIdsInDOM = true;
            initializeTestingTools();
            Window.addWindowCloseListener(new WindowCloseListener() {
                public void onWindowClosed() {
                    uninitializeTestingTools();
                }

                public String onWindowClosing() {
                    return null;
                }
            });
        }

        initializeClientHooks();

        // TODO remove hard coded id name
        view = new IView(cnf.getRootPanelId());

        makeUidlRequest("", true);
        applicationRunning = true;
    }

    /**
     * Method to check if application is in testing mode. Can be used after
     * application init.
     * 
     * @return true if in testing mode
     */
    public static boolean isTestingMode() {
        return testingMode;
    }

    /**
     * Check is application is run in testing mode.
     * 
     * @return true if in testing mode
     */
    private native static boolean checkTestingMode()
    /*-{
        @com.itmill.toolkit.terminal.gwt.client.ApplicationConnection::testingMode = $wnd.top.itmill && $wnd.top.itmill.registerToTT ? true : false;
        return @com.itmill.toolkit.terminal.gwt.client.ApplicationConnection::testingMode;
    }-*/;

    private native void initializeTestingTools()
    /*-{
         var ap = this;
         var client = {};
         client.isActive = function() {
             return ap.@com.itmill.toolkit.terminal.gwt.client.ApplicationConnection::hasActiveRequest()();
         }
         var vi = ap.@com.itmill.toolkit.terminal.gwt.client.ApplicationConnection::getVersionInfo()();
         if (vi) {
             client.getVersionInfo = function() {
                 return vi;
             }
         }
         $wnd.top.itmill.registerToTT(client);
         this.@com.itmill.toolkit.terminal.gwt.client.ApplicationConnection::ttClientWrapper = client;
    }-*/;

    /**
     * Helper for tt initialization
     */
    private JavaScriptObject getVersionInfo() {
        return configuration.getVersionInfoJSObject();
    }

    private native void uninitializeTestingTools()
    /*-{
         $wnd.top.itmill.unregisterFromTT(this.@com.itmill.toolkit.terminal.gwt.client.ApplicationConnection::ttClientWrapper);
    }-*/;

    /**
     * Publishes a JavaScript API for mash-up applications.
     * <ul>
     * <li><code>itmill.forceSync()</code> sends pending variable changes, in
     * effect synchronizing the server and client state. This is done for all
     * applications on host page.</li>
     * </ul>
     * 
     * TODO make this multi-app aware
     */
    private native void initializeClientHooks()
    /*-{
        var app = this;
        var oldSync;
        if($wnd.itmill.forceSync) {
            oldSync = $wnd.itmill.forceSync;
        }
        $wnd.itmill.forceSync = function() {
            if(oldSync) {
                oldSync();
            }
            app.@com.itmill.toolkit.terminal.gwt.client.ApplicationConnection::sendPendingVariableChanges()();
        }
    }-*/;

    public static Console getConsole() {
        return console;
    }

    private native static boolean isDebugMode()
    /*-{
     var uri = $wnd.location;
     var re = /debug[^\/]*$/;
     return re.test(uri);
     }-*/;

    public String getAppUri() {
        return configuration.getApplicationUri();
    };

    public boolean hasActiveRequest() {
        return (activeRequests > 0);
    }

    private void makeUidlRequest(String requestData, boolean repaintAll) {
        startRequest();

        console.log("Making UIDL Request with params: " + requestData);
        String uri = getAppUri() + "UIDL" + configuration.getPathInfo();
        if (repaintAll) {
            uri += "?repaintAll=1";
        }
        final RequestBuilder rb = new RequestBuilder(RequestBuilder.POST, uri);
        // rb.setHeader("Content-Type",
        // "application/x-www-form-urlencoded; charset=utf-8");
        rb.setHeader("Content-Type", "text/plain;charset=utf-8");
        try {
            rb.sendRequest(requestData, new RequestCallback() {
                public void onError(Request request, Throwable exception) {
                    // TODO Better reporting to user
                    console.error("Got error");
                    endRequest();
                }

                public void onResponseReceived(Request request,
                        Response response) {
                    handleReceivedJSONMessage(response);
                }

            });

        } catch (final RequestException e) {
            // TODO Better reporting to user
            console.error(e.getMessage());
            endRequest();
        }
    }

    private void startRequest() {
        activeRequests++;
        showLoadingIndicator();
    }

    private void endRequest() {

        checkForPendingVariableBursts();

        activeRequests--;
        // deferring to avoid flickering
        DeferredCommand.addCommand(new Command() {
            public void execute() {
                if (activeRequests == 0) {
                    hideLoadingIndicator();
                }
            }
        });
    }

    /**
     * This method is called after applying uidl change set to application.
     * 
     * It will clean current and queued variable change sets. And send next
     * change set if it exists.
     */
    private void checkForPendingVariableBursts() {
        cleanVariableBurst(pendingVariables);
        if (pendingVariableBursts.size() > 0) {
            for (Iterator iterator = pendingVariableBursts.iterator(); iterator
                    .hasNext();) {
                cleanVariableBurst((Vector) iterator.next());
            }
            Vector nextBurst = (Vector) pendingVariableBursts.firstElement();
            pendingVariableBursts.remove(0);
            buildAndSendVariableBurst(nextBurst);
        }
    }

    /**
     * Cleans given queue of variable changes of such changes that came from
     * components that do not exist anymore.
     * 
     * @param variableBurst
     */
    private void cleanVariableBurst(Vector variableBurst) {
        for (int i = 1; i < variableBurst.size(); i += 2) {
            String id = (String) variableBurst.get(i);
            id = id.substring(0, id.indexOf(VAR_FIELD_SEPARATOR));
            if (!idToPaintable.containsKey(id)) {
                // variable owner does not exist anymore
                variableBurst.remove(i - 1);
                variableBurst.remove(i - 1);
                i -= 2;
                ApplicationConnection.getConsole().log(
                        "Removed variable from removed component: " + id);
            }
        }
    }

    private void showLoadingIndicator() {
        // show initial throbber
        if (loadTimer == null) {
            loadTimer = new Timer() {
                public void run() {
                    // show initial throbber
                    if (loadElement == null) {
                        loadElement = DOM.createDiv();
                        DOM.setStyleAttribute(loadElement, "position",
                                "absolute");
                        DOM.appendChild(view.getElement(), loadElement);
                        ApplicationConnection.getConsole().log(
                                "inserting load indicator");
                        // Position
                        DOM.setStyleAttribute(loadElement, "top", (view
                                .getAbsoluteTop() + 6)
                                + "px");
                    }
                    DOM.setElementProperty(loadElement, "className",
                            "i-loading-indicator");
                    DOM.setStyleAttribute(loadElement, "display", "block");
                    final int updatedX = Window.getScrollLeft()
                            + view.getAbsoluteLeft()
                            + view.getOffsetWidth()
                            - DOM.getElementPropertyInt(loadElement,
                                    "offsetWidth") - 5;
                    DOM.setStyleAttribute(loadElement, "left", updatedX + "px");
                    final int updatedY = Window.getScrollTop() + 6
                            + view.getAbsoluteTop();
                    DOM.setStyleAttribute(loadElement, "top", updatedY + "px");
                    // Initialize other timers
                    loadTimer2 = new Timer() {
                        public void run() {
                            DOM.setElementProperty(loadElement, "className",
                                    "i-loading-indicator-delay");
                        }
                    };
                    // Second one kicks in at 1500ms
                    loadTimer2.schedule(1200);

                    loadTimer3 = new Timer() {
                        public void run() {
                            DOM.setElementProperty(loadElement, "className",
                                    "i-loading-indicator-wait");
                        }
                    };
                    // Third one kicks in at 5000ms
                    loadTimer3.schedule(4700);
                }
            };
            // First one kicks in at 300ms
            loadTimer.schedule(300);
        }
    }

    private void hideLoadingIndicator() {
        if (loadTimer != null) {
            loadTimer.cancel();
            if (loadTimer2 != null) {
                loadTimer2.cancel();
                loadTimer3.cancel();
            }
            loadTimer = null;
        }
        if (loadElement != null) {
            DOM.removeChild(view.getElement(), loadElement);
            loadElement = null;
        }
    }

    private void handleReceivedJSONMessage(Response response) {
        final Date start = new Date();
        String jsonText = response.getText();
        // for(;;);[realjson]
        jsonText = jsonText.substring(9, jsonText.length() - 1);
        JSONValue json;
        try {
            json = JSONParser.parse(jsonText);
        } catch (final com.google.gwt.json.client.JSONException e) {
            endRequest();
            console.log(e.getMessage() + " - Original JSON-text:");
            console.log(jsonText);
            return;
        }
        // Handle redirect
        final JSONObject redirect = (JSONObject) ((JSONObject) json)
                .get("redirect");
        if (redirect != null) {
            final JSONString url = (JSONString) redirect.get("url");
            if (url != null) {
                console.log("redirecting to " + url.stringValue());
                redirect(url.stringValue());
                return;
            }
        }

        // Store resources
        final JSONObject resources = (JSONObject) ((JSONObject) json)
                .get("resources");
        for (final Iterator i = resources.keySet().iterator(); i.hasNext();) {
            final String key = (String) i.next();
            resourcesMap.put(key, ((JSONString) resources.get(key))
                    .stringValue());
        }

        // Store locale data
        if (((JSONObject) json).containsKey("locales")) {
            final JSONArray l = (JSONArray) ((JSONObject) json).get("locales");
            for (int i = 0; i < l.size(); i++) {
                LocaleService.addLocale((JSONObject) l.get(i));
            }
        }

        JSONObject meta = null;
        if (((JSONObject) json).containsKey("meta")) {
            meta = ((JSONObject) json).get("meta").isObject();
            if (meta.containsKey("repaintAll")) {
                view.clear();
                idToPaintable.clear();
                paintableToId.clear();
            }
        }

        // Process changes
        final JSONArray changes = (JSONArray) ((JSONObject) json)
                .get("changes");
        for (int i = 0; i < changes.size(); i++) {
            try {
                final UIDL change = new UIDL((JSONArray) changes.get(i));
                try {
                    console.dirUIDL(change);
                } catch (final Exception e) {
                    console.log(e.getMessage());
                    // TODO: dir doesn't work in any browser although it should
                    // work (works in hosted mode)
                    // it partially did at some part but now broken.
                }
                final UIDL uidl = change.getChildUIDL(0);
                final Paintable paintable = getPaintable(uidl.getId());
                if (paintable != null) {
                    paintable.updateFromUIDL(uidl, this);
                } else {
                    if (!uidl.getTag().equals("window")) {
                        System.out.println("Received update for "
                                + uidl.getTag()
                                + ", but there is no such paintable ("
                                + uidl.getId() + ") rendered.");
                    } else {
                        view.updateFromUIDL(uidl, this);
                    }
                }
            } catch (final Throwable e) {
                e.printStackTrace();
            }
        }

        if (meta != null) {
            if (meta.containsKey("focus")) {
                final String focusPid = meta.get("focus").isString()
                        .stringValue();
                final Paintable toBeFocused = getPaintable(focusPid);
                if (toBeFocused instanceof HasFocus) {
                    final HasFocus toBeFocusedWidget = (HasFocus) toBeFocused;
                    toBeFocusedWidget.setFocus(true);
                } else if (toBeFocused instanceof Focusable) {
                    ((Focusable) toBeFocused).focus();
                } else {
                    getConsole().log("Could not focus component");
                }

            }
            if (meta.containsKey("appError")) {
                JSONObject error = meta.get("appError").isObject();
                JSONValue val = error.get("caption");
                String html = "";
                if (val.isString() != null) {
                    html += "<h1>" + val.isString().stringValue() + "</h1>";
                }
                val = error.get("message");
                if (val.isString() != null) {
                    html += "<p>" + val.isString().stringValue() + "</p>";
                }
                val = error.get("url");
                String url = null;
                if (val.isString() != null) {
                    url = val.isString().stringValue();
                }

                if (html.length() != 0) {
                    Notification n = new Notification(1000 * 60 * 45); // 45min
                    n.addEventListener(new NotificationRedirect(url));
                    n.show(html, Notification.CENTERED_TOP, "system");
                } else {
                    redirect(url);
                }
                applicationRunning = false;
            }
        }

        final long prosessingTime = (new Date().getTime()) - start.getTime();
        console.log(" Processing time was " + String.valueOf(prosessingTime)
                + "ms for " + jsonText.length() + " characters of JSON");
        console.log("Referenced paintables: " + idToPaintable.size());

        endRequest();
    }

    // Redirect browser, null reloads current page
    private static native void redirect(String url)
    /*-{
      if (url) {
         $wnd.location = url;
      } else {
          $wnd.location = $wnd.location;
      }
     }-*/;

    public void registerPaintable(String id, Paintable paintable) {
        idToPaintable.put(id, paintable);
        paintableToId.put(paintable, id);
    }

    public void unregisterPaintable(Paintable p) {
        Object id = paintableToId.get(p);
        idToPaintable.remove(id);
        paintableToTitle.remove(id);
        paintableToId.remove(p);

        if (p instanceof HasWidgets) {
            unregisterChildPaintables((HasWidgets) p);
        }
    }

    public void unregisterChildPaintables(HasWidgets container) {
        final Iterator it = container.iterator();
        while (it.hasNext()) {
            final Widget w = (Widget) it.next();
            if (w instanceof Paintable) {
                unregisterPaintable((Paintable) w);
            } else if (w instanceof HasWidgets) {
                unregisterChildPaintables((HasWidgets) w);
            }
        }
    }

    /**
     * Returns Paintable element by its id
     * 
     * @param id
     *                Paintable ID
     */
    public Paintable getPaintable(String id) {
        return (Paintable) idToPaintable.get(id);
    }

    private void addVariableToQueue(String paintableId, String variableName,
            String encodedValue, boolean immediate, char type) {
        final String id = paintableId + VAR_FIELD_SEPARATOR + variableName
                + VAR_FIELD_SEPARATOR + type;
        for (int i = 1; i < pendingVariables.size(); i += 2) {
            if ((pendingVariables.get(i)).equals(id)) {
                pendingVariables.remove(i - 1);
                pendingVariables.remove(i - 1);
                break;
            }
        }
        pendingVariables.add(encodedValue);
        pendingVariables.add(id);
        if (immediate) {
            sendPendingVariableChanges();
        }
    }

    /**
     * This method sends currently queued variable changes to server. It is
     * called when immediate variable update must happen.
     * 
     * To ensure correct order for variable changes (due servers multithreading
     * or network), we always wait for active request to be handler before
     * sending a new one. If there is an active request, we will put varible
     * "burst" to queue that will be purged after current request is handled.
     * 
     */
    public void sendPendingVariableChanges() {
        if (applicationRunning) {
            if (hasActiveRequest()) {
                // skip empty queues if there are pending bursts to be sent
                if (pendingVariables.size() > 0
                        || pendingVariableBursts.size() == 0) {
                    Vector burst = (Vector) pendingVariables.clone();
                    pendingVariableBursts.add(burst);
                }
            } else {
                buildAndSendVariableBurst(pendingVariables);
            }
        }
    }

    private void buildAndSendVariableBurst(Vector pendingVariables) {
        final StringBuffer req = new StringBuffer();

        for (int i = 0; i < pendingVariables.size(); i++) {
            if (i > 0) {
                if (i % 2 == 0) {
                    req.append(VAR_RECORD_SEPARATOR);
                } else {
                    req.append(VAR_FIELD_SEPARATOR);
                }
            }
            req.append(pendingVariables.get(i));
        }

        pendingVariables.clear();
        makeUidlRequest(req.toString(), false);
    }

    public void updateVariable(String paintableId, String variableName,
            String newValue, boolean immediate) {
        addVariableToQueue(paintableId, variableName, newValue, immediate, 's');
    }

    public void updateVariable(String paintableId, String variableName,
            int newValue, boolean immediate) {
        addVariableToQueue(paintableId, variableName, "" + newValue, immediate,
                'i');
    }

    public void updateVariable(String paintableId, String variableName,
            long newValue, boolean immediate) {
        addVariableToQueue(paintableId, variableName, "" + newValue, immediate,
                'l');
    }

    public void updateVariable(String paintableId, String variableName,
            float newValue, boolean immediate) {
        addVariableToQueue(paintableId, variableName, "" + newValue, immediate,
                'f');
    }

    public void updateVariable(String paintableId, String variableName,
            double newValue, boolean immediate) {
        addVariableToQueue(paintableId, variableName, "" + newValue, immediate,
                'd');
    }

    public void updateVariable(String paintableId, String variableName,
            boolean newValue, boolean immediate) {
        addVariableToQueue(paintableId, variableName, newValue ? "true"
                : "false", immediate, 'b');
    }

    public void updateVariable(String paintableId, String variableName,
            Object[] values, boolean immediate) {
        final StringBuffer buf = new StringBuffer();
        for (int i = 0; i < values.length; i++) {
            if (i > 0) {
                buf.append(",");
            }
            buf.append(values[i].toString());
        }
        addVariableToQueue(paintableId, variableName, buf.toString(),
                immediate, 'a');
    }

    /**
     * Update generic component features.
     * 
     * <h2>Selecting correct implementation</h2>
     * 
     * <p>
     * The implementation of a component depends on many properties, including
     * styles, component features, etc. Sometimes the user changes those
     * properties after the component has been created. Calling this method in
     * the beginning of your updateFromUIDL -method automatically replaces your
     * component with more appropriate if the requested implementation changes.
     * </p>
     * 
     * <h2>Caption, icon, error messages and description</h2>
     * 
     * <p>
     * Component can delegate management of caption, icon, error messages and
     * description to parent layout. This is optional an should be decided by
     * component author
     * </p>
     * 
     * <h2>Component visibility and disabling</h2>
     * 
     * This method will manage component visibility automatically and if
     * component is an instanceof FocusWidget, also handle component disabling
     * when needed.
     * 
     * @param component
     *                Widget to be updated, expected to implement an instance of
     *                Paintable
     * @param uidl
     *                UIDL to be painted
     * @param manageCaption
     *                True if you want to delegate caption, icon, description
     *                and error message management to parent.
     * 
     * @return Returns true iff no further painting is needed by caller
     */
    public boolean updateComponent(Widget component, UIDL uidl,
            boolean manageCaption) {

        // If the server request that a cached instance should be used, do
        // nothing
        if (uidl.getBooleanAttribute("cached")) {
            return true;
        }

        // Visibility
        boolean visible = !uidl.getBooleanAttribute("invisible");
        component.setVisible(visible);
        if (!visible) {
            return true;
        }

        // Switch to correct implementation if needed
        if (!widgetSet.isCorrectImplementation(component, uidl)) {
            final Container parent = Util.getParentLayout(component);
            if (parent != null) {
                final Widget w = widgetSet.createWidget(uidl);
                parent.replaceChildComponent(component, w);
                registerPaintable(uidl.getId(), (Paintable) w);
                ((Paintable) w).updateFromUIDL(uidl, this);
                return true;
            }
        }

        updateComponentSize(component, uidl);

        boolean enabled = !uidl.getBooleanAttribute("disabled");
        if (component instanceof FocusWidget) {
            ((FocusWidget) component).setEnabled(enabled);
        }

        StringBuffer styleBuf = new StringBuffer();
        final String primaryName = component.getStylePrimaryName();
        styleBuf.append(primaryName);

        // first disabling and read-only status
        if (!enabled) {
            styleBuf.append(" ");
            styleBuf.append("i-disabled");
        }
        if (uidl.getBooleanAttribute("readonly")) {
            styleBuf.append(" ");
            styleBuf.append("i-readonly");
        }

        // add additional styles as css classes, prefixed with component default
        // stylename
        if (uidl.hasAttribute("style")) {
            final String[] styles = uidl.getStringAttribute("style").split(" ");
            for (int i = 0; i < styles.length; i++) {
                styleBuf.append(" ");
                styleBuf.append(primaryName);
                styleBuf.append("-");
                styleBuf.append(styles[i]);
            }
        }

        // add modified classname to Fields
        if (uidl.hasAttribute("modified") && component instanceof Field) {
            styleBuf.append(" ");
            styleBuf.append(MODIFIED_CLASSNAME);
        }

        TooltipInfo tooltipInfo = getTitleInfo((Paintable) component);
        if (uidl.hasAttribute("description")) {
            tooltipInfo.setTitle(uidl.getStringAttribute("description"));
        } else {
            tooltipInfo.setTitle(null);
        }

        // add error classname to components w/ error
        if (uidl.hasAttribute("error")) {
            styleBuf.append(" ");
            styleBuf.append(primaryName);
            styleBuf.append(ERROR_CLASSNAME_EXT);

            tooltipInfo.setErrorUidl(uidl.getErrors());
        } else {
            tooltipInfo.setErrorUidl(null);
        }

        // add required style to required components
        if (uidl.hasAttribute("required")) {
            styleBuf.append(" ");
            styleBuf.append(primaryName);
            styleBuf.append(REQUIRED_CLASSNAME_EXT);
        }

        // Styles + disabled & readonly
        component.setStyleName(styleBuf.toString());

        // Set captions
        if (manageCaption) {
            final Container parent = Util.getParentLayout(component);
            if (parent != null) {
                parent.updateCaption((Paintable) component, uidl);
            }
        }

        if (usePaintableIdsInDOM) {
            DOM.setElementProperty(component.getElement(), "id", uidl.getId());
        }

        return false;
    }

    private void updateComponentSize(Widget component, UIDL uidl) {
        String w = uidl.hasAttribute("width") ? uidl
                .getStringAttribute("width") : "";
        component.setWidth(w);
        String h = uidl.hasAttribute("height") ? uidl
                .getStringAttribute("height") : "";
        component.setHeight(h);
    }

    /**
     * Get either existing or new Paintable for given UIDL.
     * 
     * If corresponding Paintable has been previously painted, return it.
     * Otherwise create and register a new Paintable from UIDL. Caller must
     * update the returned Paintable from UIDL after it has been connected to
     * parent.
     * 
     * @param uidl
     *                UIDL to create Paintable from.
     * @return Either existing or new Paintable corresponding to UIDL.
     */
    public Paintable getPaintable(UIDL uidl) {
        final String id = uidl.getId();
        Paintable w = getPaintable(id);
        if (w != null) {
            return w;
        }
        w = (Paintable) widgetSet.createWidget(uidl);
        registerPaintable(id, w);
        return w;
    }

    public String getResource(String name) {
        return (String) resourcesMap.get(name);
    }

    /**
     * Singleton method to get instance of app's context menu.
     * 
     * @return IContextMenu object
     */
    public ContextMenu getContextMenu() {
        if (contextMenu == null) {
            contextMenu = new ContextMenu();
            if (usePaintableIdsInDOM) {
                DOM.setElementProperty(contextMenu.getElement(), "id",
                        "PID_TOOLKIT_CM");
            }
        }
        return contextMenu;
    }

    /**
     * Translates custom protocols in UIRL URI's to be recognizable by browser.
     * All uri's from UIDL should be routed via this method before giving them
     * to browser due URI's in UIDL may contain custom protocols like theme://.
     * 
     * @param toolkitUri
     *                toolkit URI from uidl
     * @return translated URI ready for browser
     */
    public String translateToolkitUri(String toolkitUri) {
        if (toolkitUri == null) {
            return null;
        }
        if (toolkitUri.startsWith("theme://")) {
            final String themeUri = configuration.getThemeUri();
            if (themeUri == null) {
                console
                        .error("Theme not set: ThemeResource will not be found. ("
                                + toolkitUri + ")");
            }
            toolkitUri = themeUri + toolkitUri.substring(7);
        }
        return toolkitUri;
    }

    public String getThemeUri() {
        return configuration.getThemeUri();
    }

    /**
     * Listens for Notification hide event, and redirects. Used for system
     * messages, such as session expired.
     * 
     */
    private class NotificationRedirect implements Notification.EventListener {
        String url;

        NotificationRedirect(String url) {
            this.url = url;
        }

        public void notificationHidden(HideEvent event) {
            redirect(url);
        }

    }

    /* Extended title handling */

    /**
     * Data showed in tooltips are stored centrilized as it may be needed in
     * varios place: caption, layouts, and in owner components themselves.
     * 
     * Updating TooltipInfo is done in updateComponent method.
     * 
     */
    public TooltipInfo getTitleInfo(Paintable titleOwner) {
        TooltipInfo info = (TooltipInfo) paintableToTitle.get(titleOwner);
        if (info == null) {
            info = new TooltipInfo();
            paintableToTitle.put(titleOwner, info);
        }
        return info;
    }

    private final Tooltip tooltip = new Tooltip(this);

    /**
     * Component may want to delegate Tooltip handling to client. Layouts add
     * Tooltip (description, errors) to caption, but some components may want
     * them to appear one other elements too.
     * 
     * Events wanted by this handler are same as in Tooltip.TOOLTIP_EVENTS
     * 
     * @param event
     * @param owner
     */
    public void handleTooltipEvent(Event event, Paintable owner) {
        tooltip.handleTooltipEvent(event, owner);

    }

    /**
     * Adds PNG-fix conditionally (only for IE6) to the specified IMG -element.
     * 
     * @param el
     *                the IMG element to fix
     */
    public void addPngFix(Element el) {
        BrowserInfo b = BrowserInfo.get();
        if (b.isIE6()) {
            Util.addPngFix(el, getThemeUri()
                    + "/../default/common/img/blank.gif");
        }
    }

}