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From d...@multitask.com.au
Subject Re: Using XML to create Java objects
Date Thu, 31 Oct 2002 21:18:15 GMT
How does this compare to Jelly: 
http://jakarta.apache.org/commons/sandbox/jelly/ ?

There seems to be a lot of overlap there....
--
dIon Gillard, Multitask Consulting
Work:      http://www.multitask.com.au
Developers: http://adslgateway.multitask.com.au/developers


Russell White <russwyte@yahoo.com> wrote on 31/10/2002 11:47:56 PM:

> All of you intersted in using XML object mapping as well UI building 
with XML
> may be interested in the Swang project.
> 
> http://swang.sourceforge.net
> or
> http://sourceforge.net/projects/swang
> 
> Swang is reflective, and very powerful. It provides a plugguble modular
> TagHandler mechanism, and a very flexible schema. One example of 
themodularity
> of Swang is that the popular BeanShell scripting language is included as 
a
> TagHandler in the distribution. The beans shell script has access to the
> objects created with Swang, and vice versa. The means that you can use 
natural
> Java notation, and complex expressions.
> 
> My comany uses Swang to provided rich UIs to applications that used to 
be just
> HTML. Now thanks to JSP and XSL, we can provide any Java based UI along 
with
> the HTML version.
> 
> Swang also takes some of the worry out of handling things like threads, 
and
> thread safe changing of object properties by allowing you to mark 
> methods to be
> invoked using SwingUitilities.invokeLater() just by setting the 
attribute
> 'later' to true.
> 
> Check it out. I am really looking for advice on future versions, andam 
looking
> to other projects for synergy and community effort. 
> 
> 
> Forgive me that the example is not very full of features, but it does 
give a
> good idea of the power. Also there is some documentation, certainly 
enough to
> get started, but I am working on making it much better. The source code 
is not
> large, and pretty simple to follow.
> 
> WR
> 
> Russ White
> --- Qwerty Poiu <qwertypoi75@hotmail.com> wrote:
> 
> <HR>
> <html><div style='background-color:'><DIV>
> <P>Hey Matt and all,</P>
> <P>I think a xml to object mapper that doesn't need any config filoes 
like
> Digester is worthwile, and I would love to try it out.&nbsp; I like 
Digester
> and JAXB, JAXme, etc, but I still think these are not the end of the
> story.<BR>I want to use such an engine in conjuction with a few Schema 
and
> transformation languages to create forms in java and HTML, but what I
> really&nbsp;am interested in is the Design Patterns behind all this, and
> considering as many points of view as possible is really boradening my
> horizons.<BR></P>
> <P>Tim C.</P></DIV>
> <DIV></DIV>
> <DIV></DIV>&gt;From: Matt Pickering <MP_SK8R@YAHOO.COM>
> <DIV></DIV>&gt;Reply-To: general@xml.apache.org 
> <DIV></DIV>&gt;To: general@xml.apache.org 
> <DIV></DIV>&gt;Subject: Using XML to create Java objects 
> <DIV></DIV>&gt;Date: Tue, 29 Oct 2002 21:37:19 -0800 (PST) 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;Hello all, 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;I use XML on a daily basis in my day job and recently

> <DIV></DIV>&gt;I've started work on some gaming projects that use XML

> <DIV></DIV>&gt;to store configuration and game data. One of the most

> <DIV></DIV>&gt;tedious tasks I've had to deal with in both realms is

> <DIV></DIV>&gt;the parsing of XML in order to create Java objects, 
> <DIV></DIV>&gt;both simple and complex. 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;I know libraries and tools exist to do this, but they

> <DIV></DIV>&gt;all have one major drawback: they require me to write

> <DIV></DIV>&gt;code to describe the objects I want to create and map

> <DIV></DIV>&gt;the XML to them. 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;I've written an engine that allows me to express 
> <DIV></DIV>&gt;simple and composite Java objects as XML and have Java

> <DIV></DIV>&gt;objects come out without any work on my part other 
> <DIV></DIV>&gt;than providing a listener to capture the objects as 
> <DIV></DIV>&gt;they are created. 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;The engine uses Java Reflection to construct objects 
> <DIV></DIV>&gt;and call methods. Methods can accept simple 
> <DIV></DIV>&gt;parameters or other objects, which can also be 
> <DIV></DIV>&gt;expressed as nested XML. 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;The XML markup has to follow a few simple rules and a

> <DIV></DIV>&gt;mechanism is provided to allow the user to define 
> <DIV></DIV>&gt;constants that can substitute one value for another as

> <DIV></DIV>&gt;well as define the tags that map to various objects. 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;Here is a simple example of some XML markup that 
> <DIV></DIV>&gt;creates a Java Properties object: 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;<PROPERTIES> 
> <DIV></DIV>&gt; <?xml:namespace prefix = twgp /><twgp:alchemy
DIV
> <>&gt;xmlns:twgp="http://www.wargameproject.org/transmuteml"&gt; 
> <DIV></DIV>&gt; <twgp:mapping DIV < tag="myprops"
> parentTag="*">&gt;class="java.util.Properties"/&gt; 
> <DIV></DIV>&gt; </twgp:alchemy>
> <DIV></DIV>&gt; <MYPROPS>
> <DIV></DIV>&gt; <property value="value1" key="prop1"></property>
> <DIV></DIV>&gt; <property value="value2" key="prop2"></property>
> <DIV></DIV>&gt; <!-- Since Properties is a subclass of

> </DIV>>Hashtable, the following shows
</DIV>>         we can also 
> call put() instead of
</DIV>>setProperty(). -->
> <DIV></DIV>&gt; <put value="value3" key="prop3"></put>
> <DIV></DIV>&gt; </MYPROPS>
> <DIV></DIV>&gt;</PROPERTIES> 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;I've been using this engine to built game 
> <DIV></DIV>&gt;configuration files as well as to build config files 
> <DIV></DIV>&gt;for some rules-based code I use in my day job. 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;My question to the list is this: Would there be any 
> <DIV></DIV>&gt;interest to the community at large in such an engine?

> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;I was planning to release the engine along with the 
> <DIV></DIV>&gt;gaming code, but it is being maintained as a separate

> <DIV></DIV>&gt;codebase. I am willing to break the engine out and 
> <DIV></DIV>&gt;maintain it as a separate project if there is 
> <DIV></DIV>&gt;sufficient interest. 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;The engine is general purpose but is scoped for 
> <DIV></DIV>&gt;applications that use XML as configuration data but 
> <DIV></DIV>&gt;don't want the hassle of having to parse the XML to 
> <DIV></DIV>&gt;suit differing requirements. It is not a 
> <DIV></DIV>&gt;serialization mechanism (although I plan to add a 
> <DIV></DIV>&gt;converter to take instantiated objects and dump out 
> <DIV></DIV>&gt;compatible XML markup). It certainly isn't a "be-all,

> <DIV></DIV>&gt;end-all" solution to the problem of XML-Java 
> <DIV></DIV>&gt;conversion, but can address a decent amount of the 
> <DIV></DIV>&gt;problems that an average developer may face in using 
> <DIV></DIV>&gt;XML and Java. 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;If anyone would like to know more, please reply to the

> <DIV></DIV>&gt;list or me directly. If this ins't the appropriate 
> <DIV></DIV>&gt;forum for this, I do apologize and I will repost this

> <DIV></DIV>&gt;to the Jakarta list and take my chances there. 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;Matt Pickering 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt; 
> <DIV></DIV>&gt;__________________________________________________ 
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