Use a custom PlaceController to go to the previous page after login.

[online-glom:gwt-glom.git] / src / main / java / org / glom / web / client / activity / DocumentLoginActivity.java

/*
 * Copyright (C) 2011 Openismus GmbH
 *
 * This file is part of GWT-Glom.
 *
 * GWT-Glom is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * GWT-Glom is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with GWT-Glom.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.glom.web.client.activity;

import org.glom.web.client.ClientFactory;
import org.glom.web.client.OnlineGlomServiceAsync;
import org.glom.web.client.PlaceControllerExt;
import org.glom.web.client.StringUtils;
import org.glom.web.client.event.TableChangeEvent;
import org.glom.web.client.place.HasDocumentPlace;
import org.glom.web.client.ui.DocumentLoginView;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.place.shared.PlaceController;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.AcceptsOneWidget;

public class DocumentLoginActivity extends HasDocumentActivity {

        private final DocumentLoginView view;

        public DocumentLoginActivity(final HasDocumentPlace place, final ClientFactory clientFactory) {
                super(place, clientFactory);
                this.view = clientFactory.getDocumentLoginView();
        }
        
        private void goToPrevious() {
                final PlaceController placeController = clientFactory.getPlaceController();
                if(placeController instanceof PlaceControllerExt) {
                        final PlaceControllerExt ext = (PlaceControllerExt)placeController;
                        ext.previous();
                } else {
                        GWT.log("The PlaceController was not a PlaceControllerExt.");
                }
        }
        
        private void goToDefault() {
                final PlaceController placeController = clientFactory.getPlaceController();
                if(placeController instanceof PlaceControllerExt) {
                        final PlaceControllerExt ext = (PlaceControllerExt)placeController;
                        goTo(ext.getDefaultPlace());
                } else {
                        GWT.log("The PlaceController was not a PlaceControllerExt.");
                }
        }

        @Override
        public void start(final AcceptsOneWidget panel, final EventBus eventBus) {
                if (StringUtils.isEmpty(documentID)) {
                        goToPrevious();
                }

                // register this class as the presenter
                view.setPresenter(this);

                //Find out if there is any need for authentication,
                //asking for the credentials if necessary:
                checkAuthentication(eventBus);

                // indicate that the view is ready to be displayed
                panel.setWidget(view.asWidget());
        }

        @Override
        protected void clearView() {
                super.clearView();
                view.clear();
        }

        /*
         * (non-Javadoc)
         * 
         * @see com.google.gwt.activity.shared.AbstractActivity#onCancel()
         */
        @Override
        public void onCancel() {
                clearView();
        }

        /*
         * (non-Javadoc)
         * 
         * @see com.google.gwt.activity.shared.AbstractActivity#onStop()
         */
        @Override
        public void onStop() {
                clearView();
        }
        
        //TODO: Remove or modify this in the base class.
        /**
         * @param eventBus
         */
        protected void checkAuthentication(final EventBus eventBus) {
                if(StringUtils.isEmpty(documentID)) {
                        //TODO: Show that no document was chosen?
                        return;
                }

                // Check if the authentication info has been set for the document
                final AsyncCallback<Boolean> isAuthCallback = new AsyncCallback<Boolean>() {
                        @Override
                        public void onFailure(final Throwable caught) {
                                // TODO: create a way to notify users of asynchronous callback failures
                                GWT.log("AsyncCallback Failed: OnlineGlomService.isAuthenticated(): " + caught.getMessage());
                        }
        
                        @Override
                        public void onSuccess(final Boolean result) {
                                if (!result) {
                                        //If the user is not already authenticated,
                                        //then attempt that:
                                        setUpAuthClickHandlers(eventBus);
                                } else {
                                        // The user was already authenticated, so go to the previous (or default) page:
                                        goToPrevious();
                                        eventBus.fireEvent(new TableChangeEvent(clientFactory.getTableSelectionView()
                                                        .getSelectedTableName()));
                                }
                        }
                };
                OnlineGlomServiceAsync.Util.getInstance().isAuthenticated(documentID, isAuthCallback);
        }

        private void setUpAuthClickHandlers(final EventBus eventBus) {
                
                //The login button:
                view.setClickLoginHandler(new ClickHandler() {
                        @Override
                        public void onClick(final ClickEvent event) {
                                view.setTextFieldsEnabled(false);
        
                                final AsyncCallback<Boolean> callback = new AsyncCallback<Boolean>() {
                                        @Override
                                        public void onFailure(final Throwable caught) {
                                                // TODO: create a way to notify users of asynchronous callback failures
                                                GWT.log("AsyncCallback Failed: OnlineGlomService.checkAuthentication(): " + caught.getMessage());
                                        }
        
                                        @Override
                                        public void onSuccess(final Boolean result) {
                                                if (result) {
                                                        // If authentication succeeded, take us to the requested table:
                                                        goToPrevious();
                                                        //eventBus.fireEvent(new TableChangeEvent(clientFactory.getTableSelectionView()
                                                        //              .getSelectedTableName()));
                                                } else {
                                                        // If authentication failed, tell the user:
                                                        view.setTextFieldsEnabled(true);
                                                        view.setError();
                                                }
                                        }
                                };
                                OnlineGlomServiceAsync.Util.getInstance().checkAuthentication(documentID,
                                                view.getUsername(), view.getPassword(), callback);
                        }
                });
                
                //The cancel button:
                view.setClickCancelHandler(new ClickHandler() {
                        @Override
                        public void onClick(final ClickEvent event) {
                                goToDefault();
                        }
                });
        }

}