Java tutorial
/** * Copyright 2013 Tommi S.E. Laukkanen * * Licensed under the Apache 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.apache.org/licenses/LICENSE-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.hoot; import com.vaadin.ui.*; import org.hoot.model.Entry; import com.vaadin.data.util.BeanItem; import com.vaadin.data.util.filter.And; import com.vaadin.data.util.filter.Compare; import com.vaadin.ui.Button.ClickEvent; import com.vaadin.ui.Button.ClickListener; import org.vaadin.addons.lazyquerycontainer.LazyEntityContainer; import org.bubblecloud.ilves.component.flow.AbstractFlowlet; import org.bubblecloud.ilves.component.grid.FieldDescriptor; import org.bubblecloud.ilves.component.grid.FilterDescriptor; import org.bubblecloud.ilves.component.grid.FormattingTable; import org.bubblecloud.ilves.component.grid.Grid; import org.bubblecloud.ilves.component.grid.ValidatingEditor; import org.bubblecloud.ilves.component.grid.ValidatingEditorStateListener; import org.bubblecloud.ilves.util.ContainerUtil; import javax.persistence.EntityManager; import java.util.ArrayList; import java.util.Date; import java.util.List; /** * Entry edit flow. * * @author Tommi S.E. Laukkanen */ public final class EntryFlowlet extends AbstractFlowlet implements ValidatingEditorStateListener { /** Serial version UID. */ private static final long serialVersionUID = 1L; /** The entity manager. */ private EntityManager entityManager; /** The entry flow. */ private Entry entity; /** The entity form. */ private ValidatingEditor entryEditor; /** The save button. */ private Button saveButton; /** The discard button. */ private Button discardButton; /** The other language keys container. */ private LazyEntityContainer container; @Override public String getFlowletKey() { return "entry"; } @Override public boolean isDirty() { return entryEditor.isModified(); } @Override public boolean isValid() { return entryEditor.isValid(); } @Override public void initialize() { entityManager = getSite().getSiteContext().getObject(EntityManager.class); final GridLayout gridLayout = new GridLayout(1, 3); gridLayout.setSizeFull(); gridLayout.setMargin(false); gridLayout.setSpacing(true); gridLayout.setRowExpandRatio(2, 1f); setViewContent(gridLayout); entryEditor = new ValidatingEditor(HootFields.getFieldDescriptors(Entry.class)); entryEditor.setCaption("Entry"); entryEditor.addListener((ValidatingEditorStateListener) this); gridLayout.addComponent(entryEditor, 0, 0); final HorizontalLayout buttonLayout = new HorizontalLayout(); buttonLayout.setSpacing(true); gridLayout.addComponent(buttonLayout, 0, 1); saveButton = new Button("Save"); saveButton.setImmediate(true); buttonLayout.addComponent(saveButton); saveButton.addListener(new ClickListener() { /** Serial version UID. */ private static final long serialVersionUID = 1L; @Override public void buttonClick(final ClickEvent event) { entryEditor.commit(); entityManager.getTransaction().begin(); try { entity = entityManager.merge(entity); entity.setAuthor(getSite().getSecurityProvider().getUser()); entity.setModified(new Date()); entityManager.persist(entity); entityManager.getTransaction().commit(); entityManager.detach(entity); entryEditor.discard(); container.refresh(); } catch (final Throwable t) { if (entityManager.getTransaction().isActive()) { entityManager.getTransaction().rollback(); } throw new RuntimeException("Failed to save entity: " + entity, t); } } }); discardButton = new Button("Discard"); discardButton.setImmediate(true); buttonLayout.addComponent(discardButton); discardButton.addListener(new ClickListener() { /** Serial version UID. */ private static final long serialVersionUID = 1L; @Override public void buttonClick(final ClickEvent event) { entryEditor.discard(); } }); final List<FieldDescriptor> fieldDescriptors = HootFields.getFieldDescriptors(Entry.class); final List<FilterDescriptor> filterDefinitions = new ArrayList<FilterDescriptor>(); container = new LazyEntityContainer<Entry>(entityManager, true, true, false, Entry.class, 1000, new String[] { "basename", "key", "language", "country" }, new boolean[] { true, true, true, true }, "entryId"); container.getQueryView().getQueryDefinition().setMaxQuerySize(1); ContainerUtil.addContainerProperties(container, fieldDescriptors); final Table table = new FormattingTable(); final Grid grid = new Grid(table, container); grid.setCaption("All Translations"); grid.setSizeFull(); grid.setFields(fieldDescriptors); grid.setFilters(filterDefinitions); table.setColumnCollapsed("entryId", true); table.setColumnCollapsed("path", true); table.setColumnCollapsed("created", true); table.setColumnCollapsed("modified", true); gridLayout.addComponent(grid, 0, 2); } /** * Edit an existing entry. * @param entity entity to be edited. * @param newEntity true if entity to be edited is new. */ public void edit(final Entry entity, final boolean newEntity) { this.entity = entity; entryEditor.setItem(new BeanItem<Entry>(entity), newEntity); container.getQueryView().getQueryDefinition().setMaxQuerySize(20); container.removeAllContainerFilters(); container.getQueryView().addFilter(new And(new Compare.Equal("path", entity.getPath()), new Compare.Equal("basename", entity.getBasename()), new Compare.Equal("key", entity.getKey()))); container.refresh(); } @Override public void editorStateChanged(final ValidatingEditor source) { if (isDirty()) { if (isValid()) { saveButton.setEnabled(true); } else { saveButton.setEnabled(false); } discardButton.setEnabled(true); } else { saveButton.setEnabled(false); discardButton.setEnabled(false); } } @Override public void enter() { } }