Java tutorial
/******************************************************************************* * This file is part of OpenNMS(R). * * Copyright (C) 2012-2014 The OpenNMS Group, Inc. * OpenNMS(R) is Copyright (C) 1999-2014 The OpenNMS Group, Inc. * * OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc. * * OpenNMS(R) is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published * by the Free Software Foundation, either version 3 of the License, * or (at your option) any later version. * * OpenNMS(R) 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 Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with OpenNMS(R). If not, see: * http://www.gnu.org/licenses/ * * For more information contact: * OpenNMS(R) Licensing <license@opennms.org> * http://www.opennms.org/ * http://www.opennms.com/ *******************************************************************************/ package org.opennms.features.vaadin.config; import java.io.File; import java.io.FileWriter; import java.util.Iterator; import org.opennms.core.utils.ConfigFileConstants; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.vaadin.dialogs.ConfirmDialog; import org.opennms.core.xml.JaxbUtils; import org.opennms.features.vaadin.events.EventPanel; import org.opennms.netmgt.config.api.EventConfDao; import org.opennms.netmgt.events.api.EventConstants; import org.opennms.netmgt.events.api.EventProxy; import org.opennms.netmgt.model.events.EventBuilder; import org.opennms.netmgt.xml.eventconf.Events; import com.vaadin.annotations.Theme; import com.vaadin.annotations.Title; import com.vaadin.data.Property.ValueChangeEvent; import com.vaadin.data.util.FilesystemContainer; import com.vaadin.server.VaadinRequest; import com.vaadin.ui.Alignment; import com.vaadin.ui.Button; import com.vaadin.ui.ComboBox; import com.vaadin.ui.HorizontalLayout; import com.vaadin.ui.Label; import com.vaadin.ui.Notification; import com.vaadin.ui.UI; import com.vaadin.ui.VerticalLayout; import com.vaadin.ui.Button.ClickEvent; /** * The Class Event Administration Application. * * @author <a href="mailto:agalue@opennms.org">Alejandro Galue</a> */ @Theme("opennms") @Title("Events Administration") @SuppressWarnings("serial") public class EventAdminApplication extends UI { /** The Constant LOG. */ private static final Logger LOG = LoggerFactory.getLogger(EventAdminApplication.class); /** The OpenNMS Event Proxy. */ private EventProxy eventProxy; /** The OpenNMS Event Configuration DAO. */ private EventConfDao eventConfDao; /** * Sets the OpenNMS Event configuration DAO. * * @param eventConfDao the new OpenNMS Event configuration DAO */ public void setEventConfDao(EventConfDao eventConfDao) { this.eventConfDao = eventConfDao; } /** * Sets the OpenNMS Event Proxy. * * @param eventProxy the new event proxy */ public void setEventProxy(EventProxy eventProxy) { this.eventProxy = eventProxy; } /* (non-Javadoc) * @see com.vaadin.Application#init() */ @Override public void init(VaadinRequest request) { if (eventProxy == null) throw new RuntimeException("eventProxy cannot be null."); if (eventConfDao == null) throw new RuntimeException("eventConfDao cannot be null."); final VerticalLayout layout = new VerticalLayout(); final HorizontalLayout toolbar = new HorizontalLayout(); toolbar.setMargin(true); final Label comboLabel = new Label("Select Events Configuration File"); toolbar.addComponent(comboLabel); toolbar.setComponentAlignment(comboLabel, Alignment.MIDDLE_LEFT); final File eventsDir = new File(ConfigFileConstants.getFilePathString(), "events"); final XmlFileContainer container = new XmlFileContainer(eventsDir, true); container.addExcludeFile("default.events.xml"); // This is a protected file, should not be updated. final ComboBox eventSource = new ComboBox(); toolbar.addComponent(eventSource); eventSource.setImmediate(true); eventSource.setNullSelectionAllowed(false); eventSource.setContainerDataSource(container); eventSource.setItemCaptionPropertyId(FilesystemContainer.PROPERTY_NAME); eventSource.addValueChangeListener(new ComboBox.ValueChangeListener() { @Override public void valueChange(ValueChangeEvent event) { final File file = (File) event.getProperty().getValue(); if (file == null) return; try { LOG.info("Loading events from {}", file); final Events events = JaxbUtils.unmarshal(Events.class, file); addEventPanel(layout, file, events); } catch (Exception e) { LOG.error("an error ocurred while saving the event configuration {}: {}", file, e.getMessage(), e); Notification.show("Can't parse file " + file + " because " + e.getMessage()); } } }); final Button add = new Button("Add New Events File"); toolbar.addComponent(add); add.addClickListener(new Button.ClickListener() { @Override public void buttonClick(ClickEvent event) { PromptWindow w = new PromptWindow("New Events Configuration", "Events File Name") { @Override public void textFieldChanged(String fieldValue) { final File file = new File(eventsDir, normalizeFilename(fieldValue)); LOG.info("Adding new events file {}", file); final Events events = new Events(); addEventPanel(layout, file, events); } }; addWindow(w); } }); final Button remove = new Button("Remove Selected Events File"); toolbar.addComponent(remove); remove.addClickListener(new Button.ClickListener() { @Override public void buttonClick(ClickEvent event) { if (eventSource.getValue() == null) { Notification.show("Please select an event configuration file."); return; } final File file = (File) eventSource.getValue(); ConfirmDialog.show(getUI(), "Are you sure?", "Do you really want to remove the file " + file.getName() + "?\nThis cannot be undone and OpenNMS won't be able to handle the events configured on this file.", "Yes", "No", new ConfirmDialog.Listener() { public void onClose(ConfirmDialog dialog) { if (dialog.isConfirmed()) { LOG.info("deleting file {}", file); if (file.delete()) { try { // Updating eventconf.xml boolean modified = false; File configFile = ConfigFileConstants .getFile(ConfigFileConstants.EVENT_CONF_FILE_NAME); Events config = JaxbUtils.unmarshal(Events.class, configFile); for (Iterator<String> it = config.getEventFileCollection() .iterator(); it.hasNext();) { String fileName = it.next(); if (file.getAbsolutePath().contains(fileName)) { it.remove(); modified = true; } } if (modified) { JaxbUtils.marshal(config, new FileWriter(configFile)); EventBuilder eb = new EventBuilder( EventConstants.EVENTSCONFIG_CHANGED_EVENT_UEI, "WebUI"); eventProxy.send(eb.getEvent()); } // Updating UI Components eventSource.select(null); if (layout.getComponentCount() > 1) layout.removeComponent(layout.getComponent(1)); } catch (Exception e) { LOG.error("an error ocurred while saving the event configuration: {}", e.getMessage(), e); Notification.show("Can't save event configuration. " + e.getMessage(), Notification.Type.ERROR_MESSAGE); } } else { Notification.show("Cannot delete file " + file, Notification.Type.WARNING_MESSAGE); } } } }); } }); layout.addComponent(toolbar); layout.addComponent(new Label("")); layout.setComponentAlignment(toolbar, Alignment.MIDDLE_RIGHT); setContent(layout); } /** * Normalize filename. * * @param currentFileName the current file name * @return the string */ protected String normalizeFilename(String currentFileName) { String fileName = currentFileName.replaceFirst("\\.$", ""); if (fileName.toLowerCase().endsWith(".xml")) { if (fileName.toLowerCase().endsWith(".events.xml")) { fileName = fileName.replaceFirst("\\.[Xx][Mm][Ll]", ".xml"); } else { fileName = fileName.replaceFirst("\\.[Xx][Mm][Ll]", ".events.xml"); } } else { if (fileName.toLowerCase().endsWith(".events")) { fileName += ".xml"; } else { fileName += ".events.xml"; } } return fileName; } /** * Adds a new Events Panel. * * @param layout the layout * @param file the Events File Name * @param events the Events Object * @return a new Events Panel Object */ private void addEventPanel(final VerticalLayout layout, final File file, final Events events) { EventPanel eventPanel = new EventPanel(eventConfDao, eventProxy, file, events, new SimpleLogger()) { @Override public void cancel() { this.setVisible(false); } @Override public void success() { Notification.show("Event file " + file + " has been successfuly saved."); this.setVisible(false); } @Override public void failure(String reason) { Notification.show( "Event file " + file + " cannot be saved" + (reason == null ? "." : ", because: " + reason), Notification.Type.ERROR_MESSAGE); } }; eventPanel.setCaption("Events from " + file); removeEventPanel(layout); layout.addComponent(eventPanel); } /** * Removes the event panel. * * @param layout the layout */ private void removeEventPanel(final VerticalLayout layout) { if (layout.getComponentCount() > 1) layout.removeComponent(layout.getComponent(1)); } }