author | iignatyev |
Thu, 18 May 2017 17:07:36 -0700 | |
changeset 45181 | a84c732c62c3 |
parent 26067 | b32ccc3a76c9 |
permissions | -rw-r--r-- |
24283 | 1 |
#// Usage: jjs -scripting gutenberg.js |
2 |
||
3 |
/* |
|
4 |
* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
|
26067
b32ccc3a76c9
8055199: Tidy up Nashorn codebase for code standards (August 2014)
attila
parents:
24283
diff
changeset
|
5 |
* |
24283 | 6 |
* Redistribution and use in source and binary forms, with or without |
7 |
* modification, are permitted provided that the following conditions |
|
8 |
* are met: |
|
26067
b32ccc3a76c9
8055199: Tidy up Nashorn codebase for code standards (August 2014)
attila
parents:
24283
diff
changeset
|
9 |
* |
24283 | 10 |
* - Redistributions of source code must retain the above copyright |
11 |
* notice, this list of conditions and the following disclaimer. |
|
26067
b32ccc3a76c9
8055199: Tidy up Nashorn codebase for code standards (August 2014)
attila
parents:
24283
diff
changeset
|
12 |
* |
24283 | 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. |
|
26067
b32ccc3a76c9
8055199: Tidy up Nashorn codebase for code standards (August 2014)
attila
parents:
24283
diff
changeset
|
16 |
* |
24283 | 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. |
|
26067
b32ccc3a76c9
8055199: Tidy up Nashorn codebase for code standards (August 2014)
attila
parents:
24283
diff
changeset
|
20 |
* |
24283 | 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 |
// Simple example that demonstrates reading XML Rss feed |
|
35 |
// to generate a HTML file from script and show it by browser |
|
36 |
||
37 |
// Java classes used |
|
38 |
var Characters = Java.type("javax.xml.stream.events.Characters"); |
|
39 |
var Factory = Java.type("javax.xml.stream.XMLInputFactory"); |
|
40 |
var File = Java.type("java.io.File"); |
|
41 |
var FileWriter = Java.type("java.io.FileWriter"); |
|
42 |
var PrintWriter = Java.type("java.io.PrintWriter"); |
|
43 |
var URL = Java.type("java.net.URL"); |
|
44 |
||
45 |
// read Rss feed from a URL. Returns an array |
|
46 |
// of objects having only title and link properties |
|
47 |
function readRssFeed(url) { |
|
48 |
var fac = Factory.newInstance(); |
|
49 |
var reader = fac.createXMLEventReader(url.openStream()); |
|
50 |
||
51 |
// get text content from next event |
|
52 |
function getChars() { |
|
53 |
var result = ""; |
|
54 |
var e = reader.nextEvent(); |
|
55 |
if (e instanceof Characters) { |
|
56 |
result = e.getData(); |
|
57 |
} |
|
58 |
return result; |
|
59 |
} |
|
60 |
||
61 |
var items = []; |
|
62 |
var title, link; |
|
63 |
var inItem = false; |
|
64 |
while (reader.hasNext()) { |
|
65 |
var evt = reader.nextEvent(); |
|
66 |
if (evt.isStartElement()) { |
|
67 |
var local = evt.name.localPart; |
|
68 |
if (local == "item") { |
|
69 |
// capture title, description now |
|
70 |
inItem = true; |
|
71 |
} |
|
26067
b32ccc3a76c9
8055199: Tidy up Nashorn codebase for code standards (August 2014)
attila
parents:
24283
diff
changeset
|
72 |
|
24283 | 73 |
if (inItem) { |
74 |
switch (local) { |
|
75 |
case 'title': |
|
76 |
title = getChars(); |
|
77 |
break; |
|
78 |
case 'link': |
|
79 |
link = getChars(); |
|
80 |
break; |
|
81 |
} |
|
82 |
} |
|
83 |
} else if (evt.isEndElement()) { |
|
84 |
var local = evt.name.localPart; |
|
85 |
if (local == "item") { |
|
86 |
// one item done, save it in result array |
|
87 |
items.push({ title: title, link: link }); |
|
88 |
inItem = false; |
|
89 |
} |
|
90 |
} |
|
91 |
} |
|
92 |
||
93 |
return items; |
|
94 |
} |
|
95 |
||
96 |
// generate simple HTML for an RSS feed |
|
97 |
function getBooksHtml() { |
|
98 |
var url = new URL("http://www.gutenberg.org/cache/epub/feeds/today.rss"); |
|
99 |
var items = readRssFeed(url); |
|
100 |
||
101 |
var str = "<ul>"; |
|
102 |
||
103 |
// Nashorn's string interpolation and heredoc |
|
104 |
// support is very handy in generating text content |
|
105 |
// that is filled with elements from runtime objects. |
|
106 |
// We insert title and link in <li> elements here. |
|
107 |
for each (i in items) { |
|
108 |
str += <<EOF |
|
109 |
<li> |
|
110 |
<a href="${i.link}">${i.title}</a> |
|
111 |
</li> |
|
112 |
EOF |
|
113 |
} |
|
114 |
str += "</ul>"; |
|
115 |
return str; |
|
116 |
} |
|
117 |
||
118 |
// write the string to the given file |
|
119 |
function writeTo(file, str) { |
|
120 |
var w = new PrintWriter(new FileWriter(file)); |
|
121 |
try { |
|
122 |
w.print(str); |
|
123 |
} finally { |
|
124 |
w.close(); |
|
125 |
} |
|
126 |
} |
|
127 |
||
128 |
// generate books HTML |
|
129 |
var str = getBooksHtml(); |
|
130 |
||
131 |
// write to file. __DIR__ is directory where |
|
132 |
// this script is stored. |
|
133 |
var file = new File(__DIR__ + "books.html"); |
|
134 |
writeTo(file, str); |
|
135 |
||
136 |
// show it by desktop browser |
|
137 |
try { |
|
138 |
var Desktop = Java.type("java.awt.Desktop"); |
|
139 |
Desktop.desktop.browse(file.toURI()); |
|
140 |
} catch (e) { |
|
141 |
print(e); |
|
142 |
} |