Java tutorial
/** * Copyright (c) 2008-2012 The Sakai Foundation * * Licensed under the Educational Community 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.osedu.org/licenses/ECL-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.sakaiproject.profile2.tool.pages; import java.io.File; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.Iterator; import java.util.List; import org.apache.commons.io.FilenameUtils; import org.apache.log4j.Logger; import org.apache.wicket.ajax.AjaxRequestTarget; import org.apache.wicket.ajax.markup.html.AjaxLink; import org.apache.wicket.extensions.ajax.markup.html.IndicatingAjaxButton; import org.apache.wicket.markup.html.WebMarkupContainer; import org.apache.wicket.markup.html.basic.Label; import org.apache.wicket.markup.html.form.Form; import org.apache.wicket.markup.html.form.upload.FileUpload; import org.apache.wicket.markup.html.form.upload.MultiFileUploadField; import org.apache.wicket.markup.html.link.Link; import org.apache.wicket.markup.html.list.ListItem; import org.apache.wicket.markup.html.list.ListView; import org.apache.wicket.markup.html.navigation.paging.PagingNavigator; import org.apache.wicket.markup.html.panel.FeedbackPanel; import org.apache.wicket.markup.repeater.Item; import org.apache.wicket.markup.repeater.data.GridView; import org.apache.wicket.markup.repeater.data.IDataProvider; import org.apache.wicket.model.PropertyModel; import org.apache.wicket.model.ResourceModel; import org.apache.wicket.model.StringResourceModel; import org.apache.wicket.util.file.Files; import org.apache.wicket.util.file.Folder; import org.apache.wicket.util.lang.Bytes; import org.sakaiproject.profile2.model.GalleryImage; import org.sakaiproject.profile2.tool.components.GalleryImageRenderer; import org.sakaiproject.profile2.tool.components.IconWithClueTip; import org.sakaiproject.profile2.tool.dataproviders.GalleryImageDataProvider; import org.sakaiproject.profile2.util.ProfileConstants; import org.sakaiproject.profile2.util.ProfileUtils; /** * Main gallery component for viewing the current user's picture gallery. * * @author d.b.robinson@lancaster.ac.uk */ public class MyPictures extends BasePage { private static final Logger log = Logger.getLogger(MyPictures.class); private List<File> addPictureFiles = new ArrayList<File>(); private FileListView addPictureListView; private Folder addPictureUploadFolder; private GridView gridView; /** * Constructor for current user. */ public MyPictures() { renderMyPictures(0, sakaiProxy.getCurrentUserId()); } /** * Constructor for current user. * * @param pageToDisplay * gallery page index used to set the page the user is returned * to after making a change to the gallery. */ public MyPictures(long pageToDisplay) { renderMyPictures(pageToDisplay, sakaiProxy.getCurrentUserId()); } /** * Does the actual rendering of the page */ private void renderMyPictures(long pageToDisplay, String userUuid) { log.debug("MyPictures()"); disableLink(myPicturesLink); createGalleryForm(userUuid, pageToDisplay); createAddPictureForm(userUuid); } private void createAddPictureForm(final String userUuid) { addPictureUploadFolder = new Folder(System.getProperty("java.io.tmpdir"), "addPicturesUploadFolder"); addPictureUploadFolder.mkdirs(); //file feedback will be redirected here final FeedbackPanel fileFeedback = new FeedbackPanel("fileFeedback"); fileFeedback.setOutputMarkupId(true); Form addPictureForm = new FileUploadForm("form", userUuid, fileFeedback); addPictureForm.add(fileFeedback); addPictureForm.setOutputMarkupId(true); add(addPictureForm); Label invalidFileTypeMessageLabel = new Label("invalidFileTypeMessage", new ResourceModel("pictures.filetypewarning")); invalidFileTypeMessageLabel.setMarkupId("invalidFileTypeMessage"); invalidFileTypeMessageLabel.setOutputMarkupId(true); addPictureForm.add(invalidFileTypeMessageLabel); WebMarkupContainer addPictureContainer = new WebMarkupContainer("addPictureContainer"); addPictureContainer.add(new Label("addPictureLabel", new ResourceModel("pictures.addpicture"))); addPictureContainer.add(new MultiFileUploadField("choosePicture", new PropertyModel<Collection<FileUpload>>(addPictureForm, "uploads"), ProfileConstants.MAX_GALLERY_FILE_UPLOADS)); IndicatingAjaxButton submitButton = new IndicatingAjaxButton("submitPicture", new ResourceModel("button.gallery.upload")) { private static final long serialVersionUID = 1L; @Override protected void onSubmit(AjaxRequestTarget target, Form<?> form) { target.add(fileFeedback); } protected void onError(AjaxRequestTarget target, Form form) { log.debug("MyPictures.onSubmit validation failed."); target.add(fileFeedback); } }; addPictureContainer.add(submitButton); addPictureContainer.add(new IconWithClueTip("galleryImageUploadToolTip", ProfileConstants.INFO_IMAGE, new StringResourceModel("text.gallery.upload.tooltip", null, new Object[] { sakaiProxy.getMaxProfilePictureSize() * ProfileConstants.MAX_GALLERY_FILE_UPLOADS }))); addPictureForm.add(addPictureContainer); addPictureFiles.addAll(Arrays.asList(addPictureUploadFolder.listFiles())); addPictureListView = new FileListView("fileList", addPictureFiles); addPictureForm.add(addPictureListView); } private void createGalleryForm(final String userUuid, long pageToDisplay) { Label galleryHeading = new Label("galleryHeading", new ResourceModel("heading.pictures.my.pictures")); add(galleryHeading); Form galleryForm = new Form("galleryForm"); galleryForm.setOutputMarkupId(true); populateGallery(galleryForm, userUuid, pageToDisplay); add(galleryForm); Label addPictureHeading = new Label("addPictureHeading", new ResourceModel("heading.pictures.addpicture")); add(addPictureHeading); } /** * Populates gallery using GalleryImageDataProvider for given user. The * pageToDisplay allows us to return the user to the gallery page they were * previously viewing after removing an image from the gallery. */ private void populateGallery(Form galleryForm, final String userUuid, long pageToDisplay) { IDataProvider dataProvider = new GalleryImageDataProvider(userUuid); long numImages = dataProvider.size(); gridView = new GridView("rows", dataProvider) { private static final long serialVersionUID = 1L; @Override protected void populateItem(Item item) { final GalleryImage image = (GalleryImage) item.getModelObject(); final GalleryImageRenderer galleryImageThumbnailRenderer = new GalleryImageRenderer( "galleryImageThumbnailRenderer", image.getThumbnailResource()); AjaxLink galleryImageLink = new AjaxLink("galleryItem") { public void onClick(AjaxRequestTarget target) { setResponsePage(new MyPicture(userUuid, image, getCurrentPage())); } }; galleryImageLink.add(galleryImageThumbnailRenderer); item.add(galleryImageLink); } @Override protected void populateEmptyItem(Item item) { Link galleryImageLink = new Link("galleryItem") { @Override public void onClick() { } }; galleryImageLink.add(new Label("galleryImageThumbnailRenderer")); item.add(galleryImageLink); } }; gridView.setRows(3); gridView.setColumns(4); galleryForm.add(gridView); Label noPicturesLabel; //pager if (numImages == 0) { galleryForm.add(new PagingNavigator("navigator", gridView).setVisible(false)); noPicturesLabel = new Label("noPicturesLabel", new ResourceModel("text.gallery.pictures.num.none")); } else if (numImages <= ProfileConstants.MAX_GALLERY_IMAGES_PER_PAGE) { galleryForm.add(new PagingNavigator("navigator", gridView).setVisible(false)); noPicturesLabel = new Label("noPicturesLabel"); noPicturesLabel.setVisible(false); } else { galleryForm.add(new PagingNavigator("navigator", gridView)); noPicturesLabel = new Label("noPicturesLabel"); noPicturesLabel.setVisible(false); } galleryForm.add(noPicturesLabel); // set page to display if (pageToDisplay > 0) { if (pageToDisplay < gridView.getPageCount()) { gridView.setCurrentPage(pageToDisplay); } else { // default to last page for add/remove operations gridView.setCurrentPage(gridView.getPageCount() - 1); } } else { gridView.setCurrentPage(0); } } private class FileListView extends ListView<File> { private static final long serialVersionUID = 1L; public FileListView(String name, final List<File> files) { super(name, files); } protected void populateItem(ListItem<File> listItem) { final File file = (File) listItem.getModelObject(); listItem.add(new Label("file", file.getName())); listItem.add(new Link("delete") { public void onClick() { Files.remove(file); } }); } } private class FileUploadForm extends Form { private static final long serialVersionUID = 1L; private final Collection<FileUpload> uploads = new ArrayList<FileUpload>(); private final String userUuid; private FeedbackPanel fileFeedback; public FileUploadForm(String id, String userUuid, FeedbackPanel fileFeedback) { super(id); this.userUuid = userUuid; this.fileFeedback = fileFeedback; // set form to multipart mode setMultiPart(true); setMaxSize(Bytes .megabytes(sakaiProxy.getMaxProfilePictureSize() * ProfileConstants.MAX_GALLERY_FILE_UPLOADS)); } public Collection<FileUpload> getUploads() { return uploads; } protected void onSubmit() { if (uploads.size() == 0) { error(new StringResourceModel("error.gallery.upload.warning", this, null).getString()); return; } Iterator<FileUpload> filesToUpload = uploads.iterator(); while (filesToUpload.hasNext()) { final FileUpload upload = filesToUpload.next(); if (upload == null) { log.error("picture upload was null."); error(new StringResourceModel("error.no.file.uploaded", this, null).getString()); return; } else if (upload.getSize() == 0) { log.error("picture upload was empty."); error(new StringResourceModel("error.empty.file.uploaded", this, null).getString()); return; } else if (!ProfileUtils.checkContentTypeForProfileImage(upload.getContentType())) { log.error("attempted to upload invalid file type to gallery"); error(new StringResourceModel("error.invalid.image.type", this, null).getString()); return; } byte[] imageBytes = upload.getBytes(); if (!imageLogic.addGalleryImage(userUuid, imageBytes, upload.getContentType(), FilenameUtils.getName(upload.getClientFileName()))) { log.error("unable to save gallery image"); error(new StringResourceModel("error.file.save.failed", this, null).getString()); return; } // post upload event sakaiProxy.postEvent(ProfileConstants.EVENT_GALLERY_IMAGE_UPLOAD, "/profile/" + sakaiProxy.getCurrentUserId(), true); } // post to walls if wall enabled if (true == sakaiProxy.isWallEnabledGlobally()) { wallLogic.addNewEventToWall(ProfileConstants.EVENT_GALLERY_IMAGE_UPLOAD, sakaiProxy.getCurrentUserId()); } setResponsePage(new MyPictures(gridView.getPageCount())); } } }