Java tutorial
/******************************************************************************* * Copyright (c) 2011, 2016 Eurotech and/or its affiliates * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Eurotech *******************************************************************************/ package org.eclipse.kura.web.client.ui.Settings; import java.util.ArrayList; import java.util.logging.Level; import java.util.logging.Logger; import org.eclipse.kura.web.client.messages.Messages; import org.eclipse.kura.web.client.ui.EntryClassUi; import org.eclipse.kura.web.client.ui.Tab; import org.eclipse.kura.web.client.util.FailureHandler; import org.eclipse.kura.web.shared.GwtKuraErrorCode; import org.eclipse.kura.web.shared.GwtKuraException; import org.eclipse.kura.web.shared.model.GwtSnapshot; import org.eclipse.kura.web.shared.model.GwtXSRFToken; import org.eclipse.kura.web.shared.service.GwtSecurityTokenService; import org.eclipse.kura.web.shared.service.GwtSecurityTokenServiceAsync; import org.eclipse.kura.web.shared.service.GwtSnapshotService; import org.eclipse.kura.web.shared.service.GwtSnapshotServiceAsync; import org.gwtbootstrap3.client.ui.Alert; import org.gwtbootstrap3.client.ui.Button; import org.gwtbootstrap3.client.ui.Modal; import org.gwtbootstrap3.client.ui.ModalBody; import org.gwtbootstrap3.client.ui.ModalFooter; import org.gwtbootstrap3.client.ui.gwt.CellTable; import org.gwtbootstrap3.client.ui.html.Span; import com.google.gwt.core.client.GWT; import com.google.gwt.dom.client.Element; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.http.client.URL; import com.google.gwt.uibinder.client.UiBinder; import com.google.gwt.uibinder.client.UiField; import com.google.gwt.user.cellview.client.TextColumn; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.FileUpload; import com.google.gwt.user.client.ui.FormPanel; import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteEvent; import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteHandler; import com.google.gwt.user.client.ui.Hidden; import com.google.gwt.user.client.ui.Widget; import com.google.gwt.view.client.ListDataProvider; import com.google.gwt.view.client.SingleSelectionModel; public class SnapshotsTabUi extends Composite implements Tab { private static SnapshotsTabUiUiBinder uiBinder = GWT.create(SnapshotsTabUiUiBinder.class); private static final Logger logger = Logger.getLogger(SnapshotsTabUi.class.getSimpleName()); interface SnapshotsTabUiUiBinder extends UiBinder<Widget, SnapshotsTabUi> { } private static final Messages MSGS = GWT.create(Messages.class); private final GwtSecurityTokenServiceAsync gwtXSRFService = GWT.create(GwtSecurityTokenService.class); private final GwtSnapshotServiceAsync gwtSnapshotService = GWT.create(GwtSnapshotService.class); private final static String SERVLET_URL = "/" + GWT.getModuleName() + "/file/configuration/snapshot"; @UiField Modal uploadModal; @UiField FormPanel snapshotsForm; @UiField Button uploadCancel, uploadUpload; @UiField Button refresh, download, rollback, upload; @UiField Alert notification; @UiField FileUpload filePath; @UiField Hidden xsrfTokenField; @UiField CellTable<GwtSnapshot> snapshotsGrid = new CellTable<GwtSnapshot>(); private Element downloadIframe; private final ListDataProvider<GwtSnapshot> snapshotsDataProvider = new ListDataProvider<GwtSnapshot>(); final SingleSelectionModel<GwtSnapshot> selectionModel = new SingleSelectionModel<GwtSnapshot>(); GwtSnapshot selected; public SnapshotsTabUi() { logger.log(Level.FINER, "Initiating SnapshotsTabUI..."); initWidget(uiBinder.createAndBindUi(this)); initTable(); this.snapshotsGrid.setSelectionModel(this.selectionModel); initDownloadIframe(); initInterfaceButtons(); initUploadModalHandlers(); this.snapshotsForm.addSubmitCompleteHandler(new SubmitCompleteHandler() { @Override public void onSubmitComplete(SubmitCompleteEvent event) { String htmlResponse = event.getResults(); EntryClassUi.hideWaitModal(); if (htmlResponse == null || htmlResponse.isEmpty()) { logger.log(Level.FINER, MSGS.information() + ": " + MSGS.fileUploadSuccess()); refresh(); } else { logger.log(Level.SEVERE, MSGS.information() + ": " + MSGS.fileUploadFailure()); FailureHandler.handle(new GwtKuraException(GwtKuraErrorCode.INTERNAL_ERROR)); } } }); } @Override public void setDirty(boolean flag) { } @Override public boolean isDirty() { return false; } @Override public boolean isValid() { return true; } @Override public void refresh() { this.notification.setVisible(false); EntryClassUi.showWaitModal(); this.gwtXSRFService.generateSecurityToken(new AsyncCallback<GwtXSRFToken>() { @Override public void onFailure(Throwable ex) { EntryClassUi.hideWaitModal(); FailureHandler.handle(ex); } @Override public void onSuccess(GwtXSRFToken token) { SnapshotsTabUi.this.gwtSnapshotService.findDeviceSnapshots(token, new AsyncCallback<ArrayList<GwtSnapshot>>() { @Override public void onFailure(Throwable ex) { EntryClassUi.hideWaitModal(); FailureHandler.handle(ex); } @Override public void onSuccess(ArrayList<GwtSnapshot> result) { SnapshotsTabUi.this.snapshotsDataProvider.getList().clear(); for (GwtSnapshot pair : result) { SnapshotsTabUi.this.snapshotsDataProvider.getList().add(pair); } int snapshotsDataSize = SnapshotsTabUi.this.snapshotsDataProvider.getList().size(); if (snapshotsDataSize == 0) { SnapshotsTabUi.this.snapshotsGrid.setVisible(false); SnapshotsTabUi.this.notification.setVisible(true); SnapshotsTabUi.this.notification.setText("No Snapshots Available"); SnapshotsTabUi.this.download.setEnabled(false); SnapshotsTabUi.this.rollback.setEnabled(false); } else { SnapshotsTabUi.this.snapshotsGrid.setVisibleRange(0, snapshotsDataSize); SnapshotsTabUi.this.snapshotsGrid.setVisible(true); SnapshotsTabUi.this.notification.setVisible(false); SnapshotsTabUi.this.download.setEnabled(true); SnapshotsTabUi.this.rollback.setEnabled(true); } SnapshotsTabUi.this.snapshotsDataProvider.flush(); EntryClassUi.hideWaitModal(); } }); } }); } private void initTable() { TextColumn<GwtSnapshot> col1 = new TextColumn<GwtSnapshot>() { @Override public String getValue(GwtSnapshot object) { return String.valueOf(object.getSnapshotId()); } }; col1.setCellStyleNames("status-table-row"); this.snapshotsGrid.addColumn(col1, MSGS.deviceSnapshotId()); TextColumn<GwtSnapshot> col2 = new TextColumn<GwtSnapshot>() { @Override public String getValue(GwtSnapshot object) { return String.valueOf(object.get("createdOnFormatted")); } }; col2.setCellStyleNames("status-table-row"); this.snapshotsGrid.addColumn(col2, MSGS.deviceSnapshotCreatedOn()); this.snapshotsDataProvider.addDataDisplay(this.snapshotsGrid); } private void initUploadModalHandlers() { this.uploadCancel.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { SnapshotsTabUi.this.uploadModal.hide(); } }); this.uploadUpload.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { SnapshotsTabUi.this.gwtXSRFService.generateSecurityToken(new AsyncCallback<GwtXSRFToken>() { @Override public void onFailure(Throwable ex) { FailureHandler.handle(ex); } @Override public void onSuccess(GwtXSRFToken token) { SnapshotsTabUi.this.xsrfTokenField.setValue(token.getToken()); SnapshotsTabUi.this.snapshotsForm.submit(); SnapshotsTabUi.this.uploadModal.hide(); EntryClassUi.showWaitModal(); } }); } }); } private void initInterfaceButtons() { this.refresh.setText(MSGS.refresh()); this.refresh.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { refresh(); } }); this.download.setText(MSGS.download()); this.download.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { SnapshotsTabUi.this.selected = SnapshotsTabUi.this.selectionModel.getSelectedObject(); if (SnapshotsTabUi.this.selected != null) { // please see // http://stackoverflow.com/questions/13277752/gwt-open-window-after-rpc-is-prevented-by-popup-blocker SnapshotsTabUi.this.gwtXSRFService.generateSecurityToken(new AsyncCallback<GwtXSRFToken>() { @Override public void onFailure(Throwable ex) { FailureHandler.handle(ex); } @Override public void onSuccess(GwtXSRFToken token) { downloadSnapshot(token.getToken()); } }); } } }); this.rollback.setText(MSGS.rollback()); this.rollback.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { rollback(); } }); this.upload.setText(MSGS.upload()); this.upload.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { uploadAndApply(); } }); } private native void initDownloadIframe() /*-{ var iframe = document.createElement('iframe'); iframe.style.display = 'none' document.getElementsByTagName('body')[0].appendChild(iframe); this.@org.eclipse.kura.web.client.ui.Settings.SnapshotsTabUi::downloadIframe = iframe; }-*/; private void rollback() { final GwtSnapshot snapshot = this.selectionModel.getSelectedObject(); if (snapshot != null) { final Modal rollbackModal = new Modal(); ModalBody rollbackModalBody = new ModalBody(); ModalFooter rollbackModalFooter = new ModalFooter(); rollbackModal.setTitle(MSGS.confirm()); rollbackModal.setClosable(true); rollbackModalBody.add(new Span(MSGS.deviceSnapshotRollbackConfirm())); rollbackModalFooter.add(new Button("Yes", new ClickHandler() { @Override public void onClick(ClickEvent event) { EntryClassUi.showWaitModal(); SnapshotsTabUi.this.gwtXSRFService.generateSecurityToken(new AsyncCallback<GwtXSRFToken>() { @Override public void onFailure(Throwable ex) { EntryClassUi.hideWaitModal(); FailureHandler.handle(ex); } @Override public void onSuccess(GwtXSRFToken token) { SnapshotsTabUi.this.gwtSnapshotService.rollbackDeviceSnapshot(token, snapshot, new AsyncCallback<Void>() { @Override public void onFailure(Throwable ex) { EntryClassUi.hideWaitModal(); FailureHandler.handle(ex); } @Override public void onSuccess(Void result) { EntryClassUi.hideWaitModal(); refresh(); } }); } }); rollbackModal.hide(); } })); rollbackModalFooter.add(new Button("No", new ClickHandler() { @Override public void onClick(ClickEvent event) { rollbackModal.hide(); } })); rollbackModal.add(rollbackModalBody); rollbackModal.add(rollbackModalFooter); rollbackModal.show(); } } private void downloadSnapshot(String tokenId) { final StringBuilder sbUrl = new StringBuilder(); Long snapshot = this.selected.getSnapshotId(); sbUrl.append("/" + GWT.getModuleName() + "/device_snapshots?").append("snapshotId=").append(snapshot) .append("&").append("xsrfToken=").append(URL.encodeQueryString(tokenId)); downloadFile(sbUrl.toString()); } private native void downloadFile(String url) /*-{ var downloadIframe = this.@org.eclipse.kura.web.client.ui.Settings.SnapshotsTabUi::downloadIframe; downloadIframe.setAttribute('src', url); }-*/; private void uploadAndApply() { this.uploadModal.show(); this.uploadModal.setTitle(MSGS.upload()); this.snapshotsForm.setEncoding(FormPanel.ENCODING_MULTIPART); this.snapshotsForm.setMethod(FormPanel.METHOD_POST); this.snapshotsForm.setAction(SERVLET_URL); this.filePath.setName("uploadedFile"); this.xsrfTokenField.setID("xsrfToken"); this.xsrfTokenField.setName("xsrfToken"); this.xsrfTokenField.setValue(""); } }