Improve browser configuration error messages.

[online-glom:gwt-glom.git] / src / main / java / org / glom / web / client / activity / DocumentSelectionActivity.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.ui.DocumentSelectionView;
import org.glom.web.shared.Documents;

import com.google.gwt.activity.shared.AbstractActivity;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.place.shared.Place;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.AcceptsOneWidget;

public class DocumentSelectionActivity extends AbstractActivity implements DocumentSelectionView.Presenter {

        // TODO inject with GIN
        private final ClientFactory clientFactory;
        private final DocumentSelectionView documentSelectionView;

        public DocumentSelectionActivity(ClientFactory clientFactory) {
                this.clientFactory = clientFactory;
                this.documentSelectionView = clientFactory.getDocumentSelectionView();
        }

        @Override
        public void start(AcceptsOneWidget panel, EventBus eventBus) {
                Window.setTitle("Online Glom");

                documentSelectionView.setPresenter(this);

                AsyncCallback<Documents> callback = new AsyncCallback<Documents>() {
                        public void onFailure(Throwable caught) {
                                // Try to get an error message. Most likely this won't work but it's worth a try.
                                getAndSetErrorMessage();
                        }

                        public void onSuccess(Documents documents) {
                                documentSelectionView.clearHyperLinks();
                                if (documents.getCount() > 0) {
                                        for (int i = 0; i < documents.getCount(); i++) {
                                                documentSelectionView.addDocumentLink(documents.getDocumentID(i), documents.getTitle(i));
                                        }
                                } else {
                                        getAndSetErrorMessage();
                                }
                        }
                };
                OnlineGlomServiceAsync.Util.getInstance().getDocuments(callback);

                panel.setWidget(documentSelectionView.asWidget());
        }

        @Override
        public void goTo(Place place) {
                clientFactory.getPlaceController().goTo(place);
        }

        private void getAndSetErrorMessage() {

                AsyncCallback<String> callback = new AsyncCallback<String>() {
                        public void onFailure(Throwable caught) {
                                documentSelectionView
                                                .setErrorMessage("Unable to communicate with the servlet. Check the error log for more information.");
                        }

                        public void onSuccess(String errorMessage) {
                                documentSelectionView.setErrorMessage("Configuration Error: " + errorMessage);
                        }
                };
                OnlineGlomServiceAsync.Util.getInstance().getConfigurationErrorMessage(callback);

        }
}