dom_linker_gutenberg.js revision 1565:c779bd47d648 
1#// Usage: jjs -cp dom_linker.jar -scripting dom_linker_gutenberg.js
2
3/*
4 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 *   - Redistributions of source code must retain the above copyright
11 *     notice, this list of conditions and the following disclaimer.
12 *
13 *   - Redistributions in binary form must reproduce the above copyright
14 *     notice, this list of conditions and the following disclaimer in the
15 *     documentation and/or other materials provided with the distribution.
16 *
17 *   - Neither the name of Oracle nor the names of its
18 *     contributors may be used to endorse or promote products derived
19 *     from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
22 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34// This script depends on DOM Element dynalink linker!
35// Without that linker, this script will fail to run!
36
37// Simple example that demonstrates reading XML Rss feed
38// to generate a HTML file from script and show it by browser.
39// Uses XML DOM parser along with DOM element pluggable dynalink linker
40// for ease of navigation of DOM (child) elements by name.
41
42// Java classes used
43var DocBuilderFac = Java.type("javax.xml.parsers.DocumentBuilderFactory");
44var Node = Java.type("org.w3c.dom.Node");
45var File = Java.type("java.io.File");
46var FileWriter = Java.type("java.io.FileWriter");
47var PrintWriter = Java.type("java.io.PrintWriter");
48
49// parse XML from uri and return Document
50function parseXML(uri) {
51    var docBuilder = DocBuilderFac.newInstance().newDocumentBuilder();
52    return docBuilder["parse(java.lang.String)"](uri);
53}
54
55// generate HTML using here-doc and string interpolation
56function getBooksHtml() {
57    var doc = parseXML("http://www.gutenberg.org/cache/epub/feeds/today.rss");
58    // wrap document root Element as script convenient object
59    var rss = doc.documentElement;
60
61    var str = <<HEAD
62
63<html>
64<title>${rss._channel._title._}</title>
65<body>
66<h1>${rss._channel._description._}</h1>
67<p>
68Published on ${rss._channel._pubDate._}
69</p>
70
71HEAD
72
73    var items = rss._channel._item;
74    for each (var i in items) {
75        str += <<LIST
76
77<dl>
78<dt><a href="${i._link._}">${i._title._}</a></dt>
79<dd>${i._description._}</dd>
80</dl>
81
82LIST
83    }
84    str += <<END
85
86</body>
87</html>
88
89END
90    return str;
91}
92
93// write the string to the given file
94function writeTo(file, str) {
95    var w = new PrintWriter(new FileWriter(file));
96    try {
97        w.print(str);
98    } finally {
99        w.close();
100    }
101}
102
103// generate books HTML
104var str = getBooksHtml();
105
106// write to file. __DIR__ is directory where
107// this script is stored.
108var file = new File(__DIR__ + "books.html");
109writeTo(file, str);
110
111// show it by desktop browser
112try {
113    var Desktop = Java.type("java.awt.Desktop");
114    Desktop.desktop.browse(file.toURI());
115} catch (e) {
116    print(e);
117}
118