Java tutorial
/* * Copyright 2007, 2008, 2009 Electronic Business Systems Ltd. * * This file is part of GSS. * * GSS is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * GSS 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GSS. If not, see <http://www.gnu.org/licenses/>. */ package org.gss_project.gss.web.client; import org.gss_project.gss.web.client.MessagePanel.Images; import org.gss_project.gss.web.client.rest.DeleteCommand; import org.gss_project.gss.web.client.rest.MultipleDeleteCommand; import org.gss_project.gss.web.client.rest.RestException; import org.gss_project.gss.web.client.rest.resource.FileResource; import java.util.ArrayList; import java.util.List; import com.google.gwt.core.client.GWT; import com.google.gwt.dom.client.NativeEvent; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.dom.client.KeyCodes; import com.google.gwt.user.client.DeferredCommand; import com.google.gwt.user.client.Event.NativePreviewEvent; import com.google.gwt.user.client.ui.AbstractImagePrototype; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.DialogBox; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HasHorizontalAlignment; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.VerticalPanel; /** * The 'delete file' dialog box. */ public class DeleteFileDialog extends DialogBox { /** * The widget's constructor. * * @param images the supplied images */ public DeleteFileDialog(Images images) { // Set the dialog's caption. setText("Confirmation"); setAnimationEnabled(true); Object selection = GSS.get().getCurrentSelection(); // Create a VerticalPanel to contain the label and the buttons. VerticalPanel outer = new VerticalPanel(); HorizontalPanel buttons = new HorizontalPanel(); HTML text; if (selection instanceof FileResource) text = new HTML("<table><tr><td>" + AbstractImagePrototype.create(images.warn()).getHTML() + "</td><td>" + "Are you sure you want to <b>permanently</b> delete file '" + ((FileResource) selection).getName() + "'?</td></tr></table>"); else text = new HTML("<table><tr><td>" + AbstractImagePrototype.create(images.warn()).getHTML() + "</td><td>" + "Are you sure you want to <b>permanently</b> delete the selected files?</td></tr></table>"); text.setStyleName("gss-warnMessage"); outer.add(text); // Create the 'Delete' button, along with a listener that hides the dialog // when the button is clicked and deletes the file. Button ok = new Button("Delete", new ClickHandler() { @Override public void onClick(ClickEvent event) { deleteFile(); hide(); } }); ok.getElement().setId("confirmation.ok"); buttons.add(ok); buttons.setCellHorizontalAlignment(ok, HasHorizontalAlignment.ALIGN_CENTER); // Create the 'Cancel' button, along with a listener that hides the // dialog when the button is clicked. Button cancel = new Button("Cancel", new ClickHandler() { @Override public void onClick(ClickEvent event) { hide(); } }); cancel.getElement().setId("confirmation.cancel"); buttons.add(cancel); buttons.setCellHorizontalAlignment(cancel, HasHorizontalAlignment.ALIGN_CENTER); buttons.setSpacing(8); buttons.setStyleName("gss-warnMessage"); outer.setStyleName("gss-warnMessage"); outer.add(buttons); outer.setCellHorizontalAlignment(text, HasHorizontalAlignment.ALIGN_CENTER); outer.setCellHorizontalAlignment(buttons, HasHorizontalAlignment.ALIGN_CENTER); setWidget(outer); } /** * Generate an RPC request to delete a file. * * @param userId the ID of the current user */ private void deleteFile() { Object selection = GSS.get().getCurrentSelection(); if (selection == null) { GSS.get().displayError("No file was selected"); return; } if (selection instanceof FileResource) { FileResource file = (FileResource) selection; DeleteCommand df = new DeleteCommand(file.getUri()) { @Override public void onComplete() { GSS.get().getTreeView().updateNode(GSS.get().getTreeView().getSelection()); GSS.get().getStatusPanel().updateStats(); } @Override public void onError(Throwable t) { GWT.log("", t); if (t instanceof RestException) { int statusCode = ((RestException) t).getHttpStatusCode(); if (statusCode == 405) GSS.get().displayError("You don't have the necessary permissions"); else if (statusCode == 404) GSS.get().displayError("File not found"); else GSS.get().displayError( "Unable to delete file: " + ((RestException) t).getHttpStatusText()); } else GSS.get().displayError("System error unable to delete file: " + t.getMessage()); } }; DeferredCommand.addCommand(df); } else if (selection instanceof List) { List<FileResource> files = (List<FileResource>) selection; List<String> fileIds = new ArrayList<String>(); for (FileResource f : files) fileIds.add(f.getUri()); MultipleDeleteCommand ed = new MultipleDeleteCommand(fileIds.toArray(new String[0])) { @Override public void onComplete() { GSS.get().getTreeView().updateNode(GSS.get().getTreeView().getSelection()); } @Override public void onError(Throwable t) { GWT.log("", t); GSS.get().getTreeView().updateNode(GSS.get().getTreeView().getSelection()); } @Override public void onError(String path, Throwable t) { GWT.log("", t); if (t instanceof RestException) { int statusCode = ((RestException) t).getHttpStatusCode(); if (statusCode == 405) GSS.get().displayError("You don't have the necessary permissions"); else if (statusCode == 404) GSS.get().displayError("File not found"); else GSS.get().displayError( "Unable to delete file:" + ((RestException) t).getHttpStatusText()); } else GSS.get().displayError("System error unable to delete file:" + t.getMessage()); } }; DeferredCommand.addCommand(ed); } } @Override protected void onPreviewNativeEvent(NativePreviewEvent preview) { super.onPreviewNativeEvent(preview); NativeEvent evt = preview.getNativeEvent(); if (evt.getType().equals("keydown")) // Use the popup's key preview hooks to close the dialog when either // enter or escape is pressed. switch (evt.getKeyCode()) { case KeyCodes.KEY_ENTER: hide(); deleteFile(); break; case KeyCodes.KEY_ESCAPE: hide(); break; } } }