Java tutorial
/* * Copyright 2009 Tsutomu YANO. * * 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. * under the License. */ package jp.gihyo.wicket.page.ajax; import jp.gihyo.wicket.page.*; import java.text.SimpleDateFormat; import java.util.Collections; import java.util.List; import jp.gihyo.wicket.AppSession; import jp.gihyo.wicket.component.PagingLink; //import org.apache.wicket.PageParameters; //import org.apache.wicket.RedirectToUrlException; import org.apache.wicket.ajax.AjaxRequestTarget; import org.apache.wicket.ajax.markup.html.AjaxLink; import org.apache.wicket.behavior.SimpleAttributeModifier; import org.apache.wicket.markup.html.WebMarkupContainer; import org.apache.wicket.markup.html.WebPage; import org.apache.wicket.markup.html.basic.Label; import org.apache.wicket.markup.html.form.Button; import org.apache.wicket.markup.html.form.Form; import org.apache.wicket.markup.html.form.TextArea; import org.apache.wicket.markup.html.link.ExternalLink; import org.apache.wicket.markup.html.list.ListItem; import org.apache.wicket.markup.html.list.ListView; import org.apache.wicket.markup.html.panel.FeedbackPanel; import org.apache.wicket.model.AbstractReadOnlyModel; import org.apache.wicket.model.IModel; import org.apache.wicket.model.LoadableDetachableModel; import org.apache.wicket.model.PropertyModel; import org.apache.wicket.request.flow.RedirectToUrlException; import org.apache.wicket.request.mapper.parameter.PageParameters; import org.apache.wicket.util.string.StringValue; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import twitter4j.Paging; import twitter4j.Status; import twitter4j.Twitter; import twitter4j.TwitterException; /** * * @author Tsutomu YANO */ public class AjaxTimeline extends WebPage { private static final long serialVersionUID = -1289967315883152057L; private static final Logger LOGGER = LoggerFactory.getLogger(AjaxTimeline.class); private static final int ITEMS_PER_PAGE = 20; private int currentPageNumber = 1; private FeedbackPanel feedback; public AjaxTimeline(PageParameters parameters) { super(parameters); if (!AppSession.get().isLoggedIn()) { throw new RedirectToUrlException(getRequestCycle().urlFor(Login.class, null).toString()); } //this.currentPageNumber = parameters.getAsInteger("page", 1); StringValue page = parameters.get("page"); if (!page.isEmpty()) { this.currentPageNumber = page.toInteger(); } constructPage(); } private void constructPage() { final TweetForm form = new TweetForm("tweetForm"); add(form); feedback = new FeedbackPanel("feedback"); feedback.setOutputMarkupId(true); add(feedback); IModel<List<Status>> statusModel = new LoadableDetachableModel<List<Status>>() { @Override protected List<Status> load() { try { Twitter twitter = AppSession.get().getTwitterSession(); return twitter.getFriendsTimeline(new Paging(currentPageNumber, ITEMS_PER_PAGE)); } catch (TwitterException ex) { AjaxTimeline.this.error(getString("canNotRetrieveFriendTimeline")); return Collections.emptyList(); } } }; ListView<Status> timeline = new ListView<Status>("statusView", statusModel) { @Override protected void populateItem(final ListItem<Status> item) { final Status status = item.getModelObject(); String userUrl = "http://twitter.com/" + status.getUser().getScreenName(); ExternalLink imageLink = new ExternalLink("imageLink", userUrl); //ImageR|?[lg?A<img>^Osrc??X`?X WebMarkupContainer userImage = new WebMarkupContainer("userImage"); userImage.add(new SimpleAttributeModifier("src", status.getUser().getProfileImageURL().toString())); imageLink.add(userImage); item.add(imageLink); ExternalLink screenNameLink = new ExternalLink("screenName", userUrl, status.getUser().getScreenName()); item.add(screenNameLink); Label content = new Label("tweetContent", status.getText()); item.add(content); ExternalLink tweetLink = new ExternalLink("tweetLink", userUrl + "/status/" + status.getId(), null); item.add(tweetLink); Label time = new Label("tweetTime", new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(status.getCreatedAt())); tweetLink.add(time); Label clientName = new Label("clientName", status.getSource()); item.add(clientName.setEscapeModelStrings(false)); /* * YXe?[^XCo^\xNX?B * ?\bh?A??[JNX`?B * ??[JNX?ANXOstatus?ANZX?B */ class FavorateLabel extends Label { private static final long serialVersionUID = -2194580825236126312L; private Status targetStatus; private boolean needRefresh; public FavorateLabel(String id) { super(id); this.targetStatus = status; setDefaultModel(new AbstractReadOnlyModel<String>() { @Override public String getObject() { try { if (needRefresh) { targetStatus = getCurrentStatus(status.getId()); needRefresh = false; } return targetStatus == null ? "" : targetStatus.isFavorited() ? "unfav" : "fav"; } catch (TwitterException ex) { LOGGER.error("Can not fetch current status for status id = " + status.getId(), ex); return "error"; } } }); } public void setNeedRefresh(boolean needRefresh) { this.needRefresh = needRefresh; } } //CNx final FavorateLabel favName = new FavorateLabel("favName"); favName.setOutputMarkupId(true); /* * AjaxCN?B * Xe?[^XCo^o^?Ao^???s?B * o^???AAjaxg?Ay?[WS?ACo^Xe?[^X * Nx??B */ AjaxLink<Void> favLink = new AjaxLink<Void>("favLink") { @Override public void onClick(AjaxRequestTarget target) { try { Status currentStatus = getCurrentStatus(status.getId()); Twitter twitterSession = AppSession.get().getTwitterSession(); if (currentStatus.isFavorited()) { twitterSession.destroyFavorite(currentStatus.getId()); info(getString("favorateRemoved")); } else { twitterSession.createFavorite(currentStatus.getId()); info(getString("favorateRegistered")); } favName.setNeedRefresh(true); target.addComponent(feedback); //o^?bZ?[W\?AtB?[hobNpl?X?V?B target.addComponent(favName); } catch (TwitterException ex) { String message = getString("catNotCreateFavorite") + ": " + ex.getStatusCode(); error(message); LOGGER.error(message, ex); } } }; item.add(favLink); favLink.add(favName); //AJAX LINK item.add(new AjaxLink<Void>("replyLink") { @Override public void onClick(AjaxRequestTarget target) { String targetScreenName = status.getUser().getScreenName(); form.insertText(target, "@" + targetScreenName + " "); } }); //Q?l?AreplyLinkJavaScriptp // item.add(new Link<Void>("replyLink") { // @Override // public void onClick() { // } // // @Override // protected CharSequence getOnClickScript(CharSequence url) { // return "getElementById('" + form.getTextAreaId() + "').value = '@" + status.getUser().getScreenName() + " ';" + // "getElementById('" + form.getTextAreaId() + "').focus(); return false;"; // } // }); } }; //ListView\e?s????BreuseItemsv?peB??A //y?[W\?Ay?[WTu~bg?AXgeIuWFNg\??B //twitterey?[We?X??AXg????AXge? //Xe?[^Xu?A??dv?B timeline.setReuseItems(true); add(timeline); /* * y?[WO?EirQ?[^ */ add(new PagingLink("paging", AjaxTimeline.class, new AbstractReadOnlyModel<Integer>() { @Override public Integer getObject() { return getCurrentPage(); } })); } public int getCurrentPage() { return currentPageNumber; } protected Status getCurrentStatus(long statusId) throws TwitterException { Twitter twitterSession = AppSession.get().getTwitterSession(); Paging paging = new Paging(1, 1); paging.setMaxId(statusId); List<Status> statusList = twitterSession.getFriendsTimeline(paging); return statusList.size() > 0 ? statusList.get(0) : null; } static class TweetForm extends Form<AjaxTimeline> { private static final long serialVersionUID = -6873087998089286302L; private String tweet; private TextArea<String> updateText; public TweetForm(String id) { super(id); constructForm(); } private void constructForm() { updateText = new TextArea<String>("tweetText", new PropertyModel<String>(this, "tweet")); updateText.setOutputMarkupId(true); add(updateText); add(new Button("post") { @Override public void onSubmit() { if (tweet != null && tweet.length() > 0) { try { Twitter twitterSession = AppSession.get().getTwitterSession(); twitterSession.updateStatus(tweet); setResponsePage(AjaxTimeline.class); } catch (TwitterException ex) { String message = getString("updateFailed"); LOGGER.error(message, ex); error(message); } } } }); } public void insertText(String text) { updateText.setModelObject(text); } public void insertText(AjaxRequestTarget target, String text) { insertText(text); target.addComponent(updateText); target.focusComponent(updateText); } public String getTextAreaId() { return updateText.getMarkupId(); } } }