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#// Usage: jjs -scripting jsadapter_dom.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
// Uses XML DOM parser and DOM element wrapped by script
// "proxy" (JSAdapter constructor)
// Java classes used
var DocBuilderFac = Java.type("javax.xml.parsers.DocumentBuilderFactory");
var Node = Java.type("org.w3c.dom.Node");
var File = Java.type("java.io.File");
var FileWriter = Java.type("java.io.FileWriter");
var PrintWriter = Java.type("java.io.PrintWriter");
// constants from Node class
var ELEMENT_NODE = Node.ELEMENT_NODE;
var TEXT_NODE = Node.TEXT_NODE;
// parse XML from uri and return Document
function parseXML(uri) {
var docBuilder = DocBuilderFac.newInstance().newDocumentBuilder();
return docBuilder["parse(java.lang.String)"](uri);
}
// get child Elements of given name of the parent element given
function getChildElements(elem, name) {
var nodeList = elem.childNodes;
var childElems = [];
var len = nodeList.length;
for (var i = 0; i < len; i++) {
var node = nodeList.item(i);
if (node.nodeType == ELEMENT_NODE &&
node.tagName == name) {
childElems.push(wrapElement(node));
}
}
return childElems;
}
// get concatenated child text content of an Element
function getElemText(elem) {
var nodeList = elem.childNodes;
var len = nodeList.length;
var text = '';
for (var i = 0; i < len; i++) {
var node = nodeList.item(i);
if (node.nodeType == TEXT_NODE) {
text += node.nodeValue;
}
}
return text;
}
// Wrap DOM Element object as a convenient script object
// using JSAdapter. JSAdapter is like java.lang.reflect.Proxy
// in that it allows property access, method calls be trapped
// by 'magic' methods like __get__, __call__.
function wrapElement(elem) {
if (! elem) {
return elem;
}
return new JSAdapter() {
// getter to expose child elements and attributes by name
__get__: function(name) {
if (typeof name == 'string') {
if (name.startsWith('@')) {
var attr = elem.getAttributeNode(name.substring(1));
return !attr? undefined : attr.value;
}
var arr = getChildElements(elem, name);
if (arr.length == 1) {
// single child element, expose as single element
return arr[0];
} else {
// multiple children of given name, expose as array
return arr;
}
}
return undefined;
},
__call__: function(name) {
// toString override to get text content of this Element
if (name == 'toString' || name == 'valueOf') {
return getElemText(elem);
}
return undefined;
}
}
}
// generate HTML using here-doc and string interpolation
function getBooksHtml() {
var doc = parseXML("http://www.gutenberg.org/cache/epub/feeds/today.rss");
// wrap document root Element as script convenient object
var rss = wrapElement(doc.documentElement);
print("rss file version " + rss['@version']);
var str = <<HEAD
<html>
<title>${rss.channel.title}</title>
<body>
<h1>${rss.channel.description}</h1>
<p>
Published on ${rss.channel.pubDate}
</p>
HEAD
var items = rss.channel.item;
for each (var i in items) {
str += <<LIST
<dl>
<dt><a href="${i.link}">${i.title}</a></dt>
<dd>${i.description}</dd>
</dl>
LIST
}
str += <<END
</body>
</html>
END
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);
}
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