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.datacollection; import org.opennms.features.vaadin.api.OnmsBeanContainer; import org.opennms.netmgt.config.datacollection.Rrd; import org.vaadin.dialogs.ConfirmDialog; import com.vaadin.data.Container; import com.vaadin.data.util.converter.StringToDoubleConverter; import com.vaadin.data.util.converter.StringToIntegerConverter; import com.vaadin.ui.Alignment; import com.vaadin.ui.Button; import com.vaadin.ui.ComboBox; import com.vaadin.ui.Component; import com.vaadin.ui.CustomField; import com.vaadin.ui.DefaultFieldFactory; import com.vaadin.ui.Field; import com.vaadin.ui.HorizontalLayout; import com.vaadin.ui.Notification; import com.vaadin.ui.Table; import com.vaadin.ui.TextField; import com.vaadin.ui.VerticalLayout; /** * The RRD Field. * * @author <a href="mailto:agalue@opennms.org">Alejandro Galue</a> */ @SuppressWarnings("serial") public class RrdField extends CustomField<Rrd> implements Button.ClickListener { /** The Step. */ private final TextField step = new TextField("RRD Step (in seconds)"); /** The Container. */ private final OnmsBeanContainer<RRA> container = new OnmsBeanContainer<RRA>(RRA.class); /** The RRA Table. */ private final Table table = new Table("RRA List", container); /** The Toolbar. */ private final HorizontalLayout toolbar = new HorizontalLayout(); /** The add button. */ private final Button add = new Button("Add", this); /** The delete button. */ private final Button delete = new Button("Delete", this); /** * Instantiates a new RRD field. */ public RrdField() { step.setRequired(true); step.setImmediate(true); step.setValidationVisible(true); step.setNullSettingAllowed(false); step.setConverter(new StringToIntegerConverter()); table.addStyleName("light"); table.setVisibleColumns(new Object[] { "cf", "xff", "steps", "rows" }); table.setColumnHeaders(new String[] { "Consolidation Function", "XFF", "Steps", "Rows" }); table.setEditable(!isReadOnly()); table.setSelectable(true); table.setImmediate(true); table.setHeight("125px"); table.setWidth("100%"); table.setTableFieldFactory(new DefaultFieldFactory() { @Override public Field<?> createField(Container container, Object itemId, Object propertyId, Component uiContext) { if (propertyId.equals("cf")) { final ComboBox field = new ComboBox(); field.setImmediate(true); field.setRequired(true); field.setNullSelectionAllowed(false); field.addItem("AVERAGE"); field.addItem("MIN"); field.addItem("MAX"); field.addItem("LAST"); return field; } if (propertyId.equals("steps") || propertyId.equals("rows")) { final TextField field = new TextField(); field.setImmediate(true); field.setRequired(true); field.setNullSettingAllowed(false); field.setConverter(new StringToIntegerConverter()); return field; } if (propertyId.equals("xff")) { final TextField field = new TextField(); field.setImmediate(true); field.setRequired(true); field.setNullSettingAllowed(false); field.setConverter(new StringToDoubleConverter()); return field; } return null; } }); toolbar.addComponent(add); toolbar.addComponent(delete); toolbar.setVisible(table.isEditable()); } /* (non-Javadoc) * @see com.vaadin.ui.CustomField#initContent() */ @Override public Component initContent() { VerticalLayout layout = new VerticalLayout(); layout.addComponent(step); layout.addComponent(table); layout.addComponent(toolbar); layout.setComponentAlignment(toolbar, Alignment.MIDDLE_RIGHT); return layout; } /** * Instantiates a new RRD field. * * @param caption the caption * @Param caption the field's caption */ public RrdField(String caption) { this(); setCaption(caption); } /* (non-Javadoc) * @see com.vaadin.ui.AbstractField#getType() */ @Override public Class<Rrd> getType() { return Rrd.class; } /* (non-Javadoc) * @see com.vaadin.ui.AbstractField#setInternalValue(java.lang.Object) */ @Override protected void setInternalValue(Rrd rrd) { boolean stepState = step.isReadOnly(); step.setReadOnly(false); step.setValue(rrd.getStep().toString()); if (stepState) { step.setReadOnly(true); } container.removeAllItems(); for (String rra : rrd.getRras()) { container.addOnmsBean(new RRA(rra)); } } /* (non-Javadoc) * @see com.vaadin.ui.AbstractField#getInternalValue() */ @Override protected Rrd getInternalValue() { Rrd rrd = new Rrd(); try { rrd.setStep(Integer.valueOf((String) step.getValue())); } catch (NumberFormatException e) { rrd.setStep(null); } for (RRA rra : container.getOnmsBeans()) { rrd.addRra(rra.getRra()); } return rrd; } /* (non-Javadoc) * @see com.vaadin.ui.AbstractComponent#setReadOnly(boolean) */ @Override public void setReadOnly(boolean readOnly) { step.setReadOnly(readOnly); table.setEditable(!readOnly); toolbar.setVisible(!readOnly); super.setReadOnly(readOnly); } /* (non-Javadoc) * @see com.vaadin.ui.Button.ClickListener#buttonClick(com.vaadin.ui.Button.ClickEvent) */ @Override public void buttonClick(Button.ClickEvent event) { final Button btn = event.getButton(); if (btn == add) { addHandler(); } if (btn == delete) { deleteHandler(); } } /** * Adds the handler. */ private void addHandler() { RRA rra = new RRA(); rra.setCf("AVERAGE"); rra.setXff(0.5); rra.setSteps(0); rra.setRows(0); container.addOnmsBean(rra); } /** * Delete handler. */ private void deleteHandler() { final Object itemId = table.getValue(); if (itemId == null) { Notification.show("Please select a RRA from the table."); } else { ConfirmDialog.show(getUI(), "Are you sure?", "Do you really want to remove the selected RRA?\nThis action cannot be undone.", "Yes", "No", new ConfirmDialog.Listener() { public void onClose(ConfirmDialog dialog) { if (dialog.isConfirmed()) { table.removeItem(itemId); } } }); } } /** * Gets the step value. * * @return the step value */ public Integer getStepValue() { final String value = step.getValue(); return value == null ? null : Integer.valueOf(value); } }