Java tutorial
/* * Copyright (c) 2011 Lockheed Martin Corporation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.eurekastreams.web.client.ui.pages.settings; import java.util.ArrayList; import java.util.Comparator; import java.util.HashMap; import java.util.TreeSet; import org.eurekastreams.server.action.request.profile.GetFollowersFollowingRequest; import org.eurekastreams.server.domain.EntityType; import org.eurekastreams.server.domain.PagedSet; import org.eurekastreams.server.search.modelview.DomainGroupModelView; import org.eurekastreams.web.client.events.EventBus; import org.eurekastreams.web.client.events.Observer; import org.eurekastreams.web.client.events.data.GotGroupActivitySubscriptionsResponseEvent; import org.eurekastreams.web.client.events.data.GotPersonJoinedGroupsResponseEvent; import org.eurekastreams.web.client.events.data.StreamActivitySubscriptionChangedEvent; import org.eurekastreams.web.client.model.GroupActivitySubscriptionModel; import org.eurekastreams.web.client.model.PersonJoinedGroupsModel; import org.eurekastreams.web.client.ui.Session; import org.eurekastreams.web.client.ui.common.GroupPanel; import org.eurekastreams.web.client.ui.common.dialog.BaseDialogContent; import org.eurekastreams.web.client.ui.pages.master.StaticResourceBundle; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.user.client.ui.FlowPanel; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.SimplePanel; import com.google.gwt.user.client.ui.Widget; /** * Displays the list of groups a user has joined and allows the user to elect whether to receive notifications for them. */ public class GroupSubscriptionDialogContent extends BaseDialogContent { /** The main content panel. */ private FlowPanel mainPanel; /** The panel containing the list of groups. */ private FlowPanel listPanel; /** List of groups user is a member of. */ private PagedSet<DomainGroupModelView> groups; /** IDs of groups for which user chose to subscribe to notifications. */ private ArrayList<String> subscribedGroupIds; /** Subscribe buttons per group. */ private final HashMap<String, Widget> subscribeButtons = new HashMap<String, Widget>(); /** Unsubscribe buttons per group. */ private final HashMap<String, Widget> unsubscribeButtons = new HashMap<String, Widget>(); /** * {@inheritDoc} */ public String getTitle() { return "Groups you have joined"; } /** * {@inheritDoc} */ public Widget getBody() { if (mainPanel == null) { mainPanel = new FlowPanel(); Label label = new Label("Subscribe to the groups you wish to receive notifications from " + "and unsubscribe from those you don't."); label.addStyleName(StaticResourceBundle.INSTANCE.coreCss().groupNotifSubscriptionHelpText()); mainPanel.add(label); listPanel = new FlowPanel(); listPanel.addStyleName(StaticResourceBundle.INSTANCE.coreCss().groupNotifSubscriptionPanel()); mainPanel.add(listPanel); SimplePanel waitSpinner = new SimplePanel(); waitSpinner.addStyleName(StaticResourceBundle.INSTANCE.coreCss().waitSpinner()); listPanel.add(waitSpinner); } return mainPanel; } /** * {@inheritDoc} */ @Override public void show() { final EventBus eventBus = Session.getInstance().getEventBus(); if (groups == null) { eventBus.addObserver(GotPersonJoinedGroupsResponseEvent.class, new Observer<GotPersonJoinedGroupsResponseEvent>() { public void update(final GotPersonJoinedGroupsResponseEvent event) { eventBus.removeObserver(event, this); groups = event.getResponse(); if (subscribedGroupIds != null) { populate(); } } }); PersonJoinedGroupsModel.getInstance().fetch(new GetFollowersFollowingRequest(EntityType.GROUP, Session.getInstance().getCurrentPerson().getAccountId(), 0, Integer.MAX_VALUE), true); } if (subscribedGroupIds == null) { eventBus.addObserver(GotGroupActivitySubscriptionsResponseEvent.class, new Observer<GotGroupActivitySubscriptionsResponseEvent>() { public void update(final GotGroupActivitySubscriptionsResponseEvent event) { eventBus.removeObserver(event, this); subscribedGroupIds = event.getResponse(); if (groups != null) { populate(); } } }); GroupActivitySubscriptionModel.getInstance().fetch(false); } } /** * Builds the content from the two lists. */ private void populate() { Session.getInstance().getEventBus().addObserver(StreamActivitySubscriptionChangedEvent.class, new Observer<StreamActivitySubscriptionChangedEvent>() { public void update(final StreamActivitySubscriptionChangedEvent ev) { if (EntityType.GROUP == ev.getResponse().getEntityType()) { String groupName = ev.getResponse().getStreamEntityUniqueId(); boolean subscribed = ev.getResponse().getReceiveNewActivityNotifications(); Widget button; button = subscribeButtons.get(groupName); if (button != null) { button.setVisible(!subscribed); } button = unsubscribeButtons.get(groupName); if (button != null) { button.setVisible(subscribed); } } } }); // remove spinner listPanel.clear(); // display message if no groups if (groups.getPagedSet().isEmpty()) { Label label = new Label("You are not a member of any groups."); label.addStyleName(StaticResourceBundle.INSTANCE.coreCss().connectionItemEmpty()); listPanel.add(label); return; } // sort groups by name TreeSet<DomainGroupModelView> orderedGroups = new TreeSet<DomainGroupModelView>( new Comparator<DomainGroupModelView>() { public int compare(final DomainGroupModelView inO1, final DomainGroupModelView inO2) { return inO1.getName().compareToIgnoreCase(inO2.getName()); } }); orderedGroups.addAll(groups.getPagedSet()); // display groups for (final DomainGroupModelView group : orderedGroups) { GroupPanel groupWidget = new GroupPanel(group, false, true, false); final Label subscribeButton = new Label(); subscribeButtons.put(group.getUniqueId(), subscribeButton); final Label unsubscribeButton = new Label(); unsubscribeButtons.put(group.getUniqueId(), unsubscribeButton); subscribeButton.addStyleName(StaticResourceBundle.INSTANCE.coreCss().groupNotifSubscribeButton()); unsubscribeButton.addStyleName(StaticResourceBundle.INSTANCE.coreCss().groupNotifUnsubscribeButton()); subscribeButton.addClickHandler(new ClickHandler() { public void onClick(final ClickEvent inArg0) { GroupActivitySubscriptionModel.getInstance().insert(group.getUniqueId()); } }); unsubscribeButton.addClickHandler(new ClickHandler() { public void onClick(final ClickEvent inArg0) { GroupActivitySubscriptionModel.getInstance().delete(group.getUniqueId()); } }); boolean subscribed = subscribedGroupIds.contains(group.getUniqueId()); subscribeButton.setVisible(!subscribed); unsubscribeButton.setVisible(subscribed); groupWidget.insert(subscribeButton, 0); groupWidget.insert(unsubscribeButton, 1); listPanel.add(groupWidget); } } /** * {@inheritDoc} */ @Override public String getCssName() { return StaticResourceBundle.INSTANCE.coreCss().groupNotifSubscriptionDialog(); } }