8178490: Usages of is_object_aligned with pointers are broken
Reviewed-by: tschatzl, kbarrett
#// 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);
}