Java tutorial
/* * Copyright 2013~2014 Dan Haywood * * 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 todoapp.app.services.export; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.util.List; import com.google.common.base.Function; import com.google.common.io.Resources; import org.docx4j.openpackaging.packages.WordprocessingMLPackage; import org.jdom2.Document; import org.jdom2.Element; import org.jdom2.JDOMException; import org.jdom2.output.DOMOutputter; import org.apache.isis.applib.DomainObjectContainer; import org.apache.isis.applib.annotation.Action; import org.apache.isis.applib.annotation.ActionLayout; import org.apache.isis.applib.annotation.DomainService; import org.apache.isis.applib.annotation.DomainServiceLayout; import org.apache.isis.applib.annotation.MemberOrder; import org.apache.isis.applib.annotation.Programmatic; import org.apache.isis.applib.annotation.SemanticsOf; import org.apache.isis.applib.services.clock.ClockService; import org.apache.isis.applib.value.Blob; import org.isisaddons.module.docx.dom.DocxService; import org.isisaddons.module.docx.dom.LoadTemplateException; import org.isisaddons.module.docx.dom.MergeException; import todoapp.dom.todoitem.ToDoItem; import todoapp.dom.todoitem.ToDoItems; @DomainService @DomainServiceLayout(named = "ToDos", menuOrder = "30") public class ExportToWordService { //region > exportToWordDoc (action) @Action(semantics = SemanticsOf.SAFE) @ActionLayout(cssClassFa = "fa-download") @MemberOrder(sequence = "10") public Blob exportToWordDoc() throws IOException, JDOMException, MergeException { final List<ToDoItem> notYetComplete = toDoItems.notYetComplete(); return exportToWordDoc(notYetComplete); } //endregion //region > exportToWordDoc (programmatic) @Programmatic public Blob exportToWordDoc(final List<ToDoItem> items) { return exportToWordDocCatchExceptions(items); } private Blob exportToWordDocCatchExceptions(final List<ToDoItem> items) { final org.w3c.dom.Document w3cDocument; try { w3cDocument = asInputW3cDocument(items); final ByteArrayOutputStream docxTarget = new ByteArrayOutputStream(); docxService.merge(w3cDocument, getWordprocessingMLPackage(), docxTarget, DocxService.MatchingPolicy.LAX); final String blobName = "todoItems-" + timestamp() + ".docx"; final String blobMimeType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document"; final byte[] blobBytes = docxTarget.toByteArray(); return new Blob(blobName, blobMimeType, blobBytes); } catch (JDOMException | MergeException e) { throw new RuntimeException(e); } } private String timestamp() { return clockService.nowAsLocalDateTime().toString("yyyyMMdd'_'HHmmss"); } private org.w3c.dom.Document asInputW3cDocument(final List<ToDoItem> items) throws JDOMException { final Document jdomDoc = asInputDocument(items); final DOMOutputter domOutputter = new DOMOutputter(); return domOutputter.output(jdomDoc); } private Document asInputDocument(final List<ToDoItem> items) { final Element html = new Element("html"); final Document document = new Document(html); final Element body = new Element("body"); html.addContent(body); addPara(body, "ExportedOn", "date", clockService.nowAsLocalDateTime().toString("dd-MMM-yyyy")); final Element table = addTable(body, "ToDoItems"); for (final ToDoItem item : items) { addTableRow(table, new String[] { item.getDescription(), item.getCost() != null ? item.getCost().toString() : "", item.getDueBy() != null ? item.getDueBy().toString("dd-MMM") : "" }); } return document; } //endregion ( //region > helper: getWordprocessingMLPackage private WordprocessingMLPackage wordprocessingMLPackage; // lazily initialized to speed up bootstrapping (at cost of not failing fast). private WordprocessingMLPackage getWordprocessingMLPackage() { initializeIfNecessary(); return wordprocessingMLPackage; } private void initializeIfNecessary() { if (wordprocessingMLPackage == null) { try { final byte[] bytes = Resources .toByteArray(Resources.getResource(this.getClass(), "ToDoItemsExport.docx")); wordprocessingMLPackage = docxService.loadPackage(new ByteArrayInputStream(bytes)); } catch (IOException | LoadTemplateException e) { throw new RuntimeException(e); } } } //endregion //region > helpers private static final Function<String, String> TRIM = new Function<String, String>() { @Override public String apply(final String input) { return input.trim(); } }; private static void addPara(final Element body, final String id, final String clazz, final String text) { final Element p = new Element("p"); body.addContent(p); p.setAttribute("id", id); p.setAttribute("class", clazz); p.setText(text); } private static Element addList(final Element body, final String id) { final Element ul = new Element("ul"); body.addContent(ul); ul.setAttribute("id", id); return ul; } private static Element addListItem(final Element ul, final String... paras) { final Element li = new Element("li"); ul.addContent(li); for (final String para : paras) { addPara(li, para); } return ul; } private static void addPara(final Element li, final String text) { if (text == null) { return; } final Element p = new Element("p"); li.addContent(p); p.setText(text); } private static Element addTable(final Element body, final String id) { final Element table = new Element("table"); body.addContent(table); table.setAttribute("id", id); return table; } private static void addTableRow(final Element table, final String[] cells) { final Element tr = new Element("tr"); table.addContent(tr); for (final String columnName : cells) { final Element td = new Element("td"); tr.addContent(td); td.setText(columnName); } } //endregion //region > injected services @javax.inject.Inject DomainObjectContainer container; @javax.inject.Inject private DocxService docxService; @javax.inject.Inject private ToDoItems toDoItems; @javax.inject.Inject private ClockService clockService; //endregion }