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Topic: nanoxml (Read 8634 times) |
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toxi
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nanoxml
« on: Dec 5th, 2003, 1:25pm » |
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just finished reading jon knudsen's J2ME book which has a nice list of lightweight xml parsers at the end. so i decided to give nanoXML a go (it's tiny: 6K) and mocked up a little example for public consumption.
a quick note, if you want to use nanoxml in your own sketches: the "nanoxml-lite-2.2.3.jar" file is not valid (missing manifest file), so i only got it to work with P5 after renaming it into a zip file and extracting the contents (2 classes) into a folder called "nanoxml" inside the code folder of your sketch...
so here's the "fake-weather" demo: http://www.toxi.co.uk/p5/nanoxmltest/
...using this static xml file: http://www.toxi.co.uk/p5/data/test.xml
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http://toxi.co.uk/
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Martin
    
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Re: nanoxml
« Reply #1 on: Dec 5th, 2003, 2:16pm » |
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hi toxi. this is a fantastic exploration.  perhaps you can also implement one that reads the world's weather data for a day or some other info encoded in xml. afterwhich, save the output into a pdf file. would have done it myself if i wasn't too busy. cheers!
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toxi
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Re: nanoxml
« Reply #2 on: Dec 5th, 2003, 2:27pm » |
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well yes, that could be ++interesting - but i really only needed xml for something else in P5 and this was more a proof of concept thingy. as for a global weather data source, the BBC weather site would probably be a good start though...
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http://toxi.co.uk/
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TomC
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Re: nanoxml
« Reply #3 on: Aug 25th, 2004, 4:50pm » |
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on Dec 5th, 2003, 1:25pm, toxi wrote:
a quick note, if you want to use nanoxml in your own sketches: the "nanoxml-lite-2.2.3.jar" file is not valid (missing manifest file), so i only got it to work with P5 after renaming it into a zip file and extracting the contents (2 classes) into a folder called "nanoxml" inside the code folder of your sketch...
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As an alternative to this, you can specify the package whenever you refer to an XMLElement, e.g.
Code:
// declare a new XMLElement:
nanoxml.XMLElement xml = new nanoxml.XMLElement();
// a function which returns some XML
nanoxml.XMLElement getXML() {
return xml;
}
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But Toxi's method makes for neater code
Incidentally, I am currently trying out Java 1.5.0, and my own XML code is broken with the new plug-in (only other noticable difference is a whizzy start-up screen). More compatibility problems! 
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toxi
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Re: nanoxml
« Reply #4 on: Sep 28th, 2004, 8:46pm » |
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i just wrote a little extension to nanoxml's XMLElement class to select childnodes in an XPATH style manner.
take the following XML tree as an example:
Code:<root>
<aaa>
<bbb>hello!</bbb>
<bbb>world</bbb>
<aaa>
<bbb>welcome earthling!</bbb>
</root> |
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now in order to get to a nested <bbb> tag's content you'd have to write:
Code:XMLElement xmldoc; // parsed somewhere else
XMLElement aaa=(XMLElement)(xmldoc.getChildren().elementAt(0));
XMLElement bbb=(XMLElement)(aaa.getChildren().elementAt(0));
println(bbb.getContent());
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with more nested tree structures the code to access deep nodes will become increasingly akward and prone to errors.
the new method lets you directly access a defined set of nodes which match the specified tree path, like this:
Code:// get all <bbb> tags inside <aaa>
Vector bbbVector=xmldoc.getChildrenForPath("aaa/bbb");
// turn into an iterator
Enumeration bbbEnum=bbbVector.elements();
while(bbbEnum.hasMoreElements()) {
XMLElement currBBB=(XMLElement)bbbEnum.nextElement();
println(currBBB.getContent());
}
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the above example will return both <bbb> childnodes of the <aaa> node, but not the <bbb> node which is a sibling of <aaa>...
also note, this is by no means a complete XPATH parser, but even this barebones syntax already makes working with XML in Processing a lot easier...
now simply download the nanoxml source code and add the code below to the existing XMLElement.java:
Code:/**
*
* @param path XPath style string to select childnodes at specified hierarchy
* @return Vector containing all matched childnodes
*/
public Vector getChildrenForPath(String path) {
Vector selection = new Vector();
StringTokenizer st = new StringTokenizer(path, "/");
String currPath = st.nextToken();
String subpath = st.hasMoreTokens() ? path.substring(currPath.length() + 1) : "";
if (this.countChildren() > 0) {
Enumeration nodeChildren = this.enumerateChildren();
while (nodeChildren.hasMoreElements()) {
XMLElement child = (XMLElement)nodeChildren.nextElement();
if (child.getName().equals(currPath)) {
if (subpath.length()>0) {
Enumeration subselection = child.getChildrenForPath(subpath).elements();
while (subselection.hasMoreElements())
selection.add(subselection.nextElement());
}
else
selection.add(child);
}
}
}
return selection;
} |
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http://toxi.co.uk/
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eskimoblood
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Re: nanoxml
« Reply #5 on: Oct 25th, 2004, 5:23pm » |
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I try do use the parser. In processing it works fine but when i create a applet the applet crashed in the Browser.
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TomC
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Re: nanoxml
« Reply #6 on: Oct 25th, 2004, 9:06pm » |
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I have this problem with the new Sun java 1.5 - is that what you're using?
I'm going to try modifying the nanoxml source and see if that helps - it looks like there are some naming collisions with the newest java API and nanoxml.
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| « Last Edit: Oct 25th, 2004, 9:07pm by TomC » |
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eskimoblood
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Re: nanoxml
« Reply #7 on: Oct 25th, 2004, 10:49pm » |
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No I use the following:
Java(TM) Plug-in: Version 1.4.1_07
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eskimoblood
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Re: nanoxml
« Reply #8 on: Oct 25th, 2004, 11:22pm » |
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I figured out that is a problem to acces my extern xml file (java.security.AccessControlException: access denied (java.net.SocketPermission www.eskimoblood.de resolve)). If the xml file is in the data folder everything works fine.
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katapulp
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Re: nanoxml
« Reply #9 on: Nov 14th, 2004, 3:35pm » |
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I tried to run the "fake-weather demo" with the source code but it doesn't work. I put nanoXML lite (extracted in a directory like toxi wrote in his quick note) in the sketch directory, and i can't run the program.
Error: "C:/processing-0068/lib/build/Temporary_8432_9911.java:8:1:8:10: Semantic Error: Type XMLElement was not found.C:/processing-0068/lib/build/Temporary_8432_9911.java:14:13:14:22: Semantic Error: A candidate for type "XMLElement" was found, but it is invalid and needs to be fixed before this type will successfully compile.C:/processing-0068/lib/build/Temporary_8432_9911.java:47:5:47:14 : Semantic Error: A candidate for type "XMLElement" was found, but it is invalid and needs to be fixed before this type will successfully compile.C:/processing-0068/lib/build/Temporary_8432_9911.java:47:22:47:3 1: Semantic Error: A candidate for type "XMLElement" was found, but it is invalid and needs to be fixed before this type will successfully compile."
Any idea?
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TomC
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Re: nanoxml
« Reply #10 on: Nov 14th, 2004, 9:53pm » |
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What version of Java do you have?
I think nanoxml has problems with the latest Java runtime (1.5). This is because some of the nanoxml class names are now used by the Java libraries. I seem to remember that it works if you use the fully-qualified class name (namoxml.XMLElement) in your code.
I've got a version which works, and when I work out what to do with the licensing issues, I'll post it here.
Until now, my advice is to install Java 1.4.2 (at least as your browser plug-in) unless you absolutely must have things that only Java 1.5 provides.
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katapulp
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Re: nanoxml
« Reply #11 on: Nov 15th, 2004, 6:00pm » |
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I have java 1.4.2_06 (build 03)... It seems processing has a problem to find "XMLElement" and i don't know why, i just c/p the source code and put nanoxml-lite in the sketch directory...
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mattgilbert
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Re: nanoxml
« Reply #12 on: Nov 18th, 2004, 6:47am » |
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Maybe it should be in your project's "code" folder? Is that where you have it?
i don't really know, i haven't tried to use nanoxml.
Matt
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fjen
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Re: nanoxml
« Reply #13 on: Nov 18th, 2004, 1:41pm » |
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i have the .classes in the code folder and it works fine. ..
sketch folder
+ sketch.pde
+ code
+ XMLElement.class
+ XMLException.class
+ data
+ blah.gif
does this work for you?
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| « Last Edit: Nov 18th, 2004, 1:41pm by fjen » |
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katapulp
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Re: nanoxml
« Reply #14 on: Nov 18th, 2004, 2:08pm » |
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on Nov 18th, 2004, 1:41pm, fjen wrote:
sketch folder
+ sketch.pde
+ code
+ XMLElement.class
+ XMLException.class
+ data
+ blah.gif
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I doesn't work with the fake weather script, still the same error. I don't understand, i must have a problem with the 2 .class files...
Could you please put a simple sketch online
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