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-#// Usage: jjs -scripting gutenberg.js
-
-/*
- * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * - Neither the name of Oracle nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-// Simple example that demonstrates reading XML Rss feed
-// to generate a HTML file from script and show it by browser
-
-// Java classes used
-var Characters = Java.type("javax.xml.stream.events.Characters");
-var Factory = Java.type("javax.xml.stream.XMLInputFactory");
-var File = Java.type("java.io.File");
-var FileWriter = Java.type("java.io.FileWriter");
-var PrintWriter = Java.type("java.io.PrintWriter");
-var URL = Java.type("java.net.URL");
-
-// read Rss feed from a URL. Returns an array
-// of objects having only title and link properties
-function readRssFeed(url) {
- var fac = Factory.newInstance();
- var reader = fac.createXMLEventReader(url.openStream());
-
- // get text content from next event
- function getChars() {
- var result = "";
- var e = reader.nextEvent();
- if (e instanceof Characters) {
- result = e.getData();
- }
- return result;
- }
-
- var items = [];
- var title, link;
- var inItem = false;
- while (reader.hasNext()) {
- var evt = reader.nextEvent();
- if (evt.isStartElement()) {
- var local = evt.name.localPart;
- if (local == "item") {
- // capture title, description now
- inItem = true;
- }
-
- if (inItem) {
- switch (local) {
- case 'title':
- title = getChars();
- break;
- case 'link':
- link = getChars();
- break;
- }
- }
- } else if (evt.isEndElement()) {
- var local = evt.name.localPart;
- if (local == "item") {
- // one item done, save it in result array
- items.push({ title: title, link: link });
- inItem = false;
- }
- }
- }
-
- return items;
-}
-
-// generate simple HTML for an RSS feed
-function getBooksHtml() {
- var url = new URL("http://www.gutenberg.org/cache/epub/feeds/today.rss");
- var items = readRssFeed(url);
-
- var str = "<ul>";
-
- // Nashorn's string interpolation and heredoc
- // support is very handy in generating text content
- // that is filled with elements from runtime objects.
- // We insert title and link in <li> elements here.
- for each (i in items) {
- str += <<EOF
-<li>
- <a href="${i.link}">${i.title}</a>
-</li>
-EOF
- }
- str += "</ul>";
- return str;
-}
-
-// write the string to the given file
-function writeTo(file, str) {
- var w = new PrintWriter(new FileWriter(file));
- try {
- w.print(str);
- } finally {
- w.close();
- }
-}
-
-// generate books HTML
-var str = getBooksHtml();
-
-// write to file. __DIR__ is directory where
-// this script is stored.
-var file = new File(__DIR__ + "books.html");
-writeTo(file, str);
-
-// show it by desktop browser
-try {
- var Desktop = Java.type("java.awt.Desktop");
- Desktop.desktop.browse(file.toURI());
-} catch (e) {
- print(e);
-}