XML to Java SAX emitter compiler

[Henri Sivonen]

I am generating XML by emitting SAX events programmatically from Java.
However, there's a lot of boilerplate markup, so being able to generate
code from XML would be nice.

Is there a tool that would take an XML file like this

<?args org.xml.sax.ContentHandler ch, com.example.Foo foo ?>
<baz xmlns="http://example.com/fooml/">
<?code foo.bar(ch); ?>
</baz>

and would generate a Java class like this

public class GeneratedEmitter {
public static void emit(org.xml.sax.ContentHandler ch,
com.example.Foo foo) throws SAXException {
ch.startDocument();
ch.startElement("http://example.com/fooml/", "baz", "baz", new
AttributesImpl());
foo.bar(ch);
ch.endElement("http://example.com/fooml/", "baz", "baz");
ch.endDocument();
}
}

?

--
Henri Sivonen
hs******@iki.fi
http://iki.fi/hsivonen/

[Ira Baxter]

"Henri Sivonen" <hs******@iki.fi> wrote in message
news:hs****************************@news.dnaintern et.net...

I am generating XML by emitting SAX events programmatically from Java.
However, there's a lot of boilerplate markup, so being able to generate
code from XML would be nice.

Is there a tool that would take an XML file like this

<?args org.xml.sax.ContentHandler ch, com.example.Foo foo ?>
<baz xmlns="http://example.com/fooml/">
<?code foo.bar(ch); ?>
</baz>

and would generate a Java class like this

public class GeneratedEmitter {
public static void emit(org.xml.sax.ContentHandler ch,
com.example.Foo foo) throws SAXException {
ch.startDocument();
ch.startElement("http://example.com/fooml/", "baz", "baz", new
AttributesImpl());
foo.bar(ch);
ch.endElement("http://example.com/fooml/", "baz", "baz");
ch.endDocument();

Code generation from XML is a popular topic.

Since many XML documents represent trees,
doing a classic on-the-fly code generator by
tree walk is one way to do it. XSLT
can often be used to do this.

Other ways are to build ad-hoc code generators
in your favorite programming language by
making calls on a DOM to get at the XML data.

A tool that accepts source-to-source transformations,
that could do XML to Java generation directly
is the DMS Software Reengineering Toolkit.
See http://www.semanticdesigns.com/Produ...MSToolkit.html.
--
Ira D. Baxter, Ph.D., CTO 512-250-1018
Semantic Designs, Inc. www.semdesigns.com

[Henri Sivonen]

In article <cs********@enews4.newsguy.com>,
"Ira Baxter" <id******@semdesigns.com> wrote:

"Henri Sivonen" <hs******@iki.fi> wrote in message
news:hs****************************@news.dnaintern et.net...

I am generating XML by emitting SAX events programmatically from Java.
However, there's a lot of boilerplate markup, so being able to generate
code from XML would be nice.

Since many XML documents represent trees,
doing a classic on-the-fly code generator by
tree walk is one way to do it. XSLT
can often be used to do this.

Other ways are to build ad-hoc code generators
in your favorite programming language by
making calls on a DOM to get at the XML data.

A tool that accepts source-to-source transformations,
that could do XML to Java generation directly
is the DMS Software Reengineering Toolkit.
See http://www.semanticdesigns.com/Produ...MSToolkit.html.

Thanks. I already wrote a SAX compiler myself, but I have not gotten
around to releasing it yet. I think all those methods are overkills in
this case, because the mapping from SAX callback to generated code are
straightforward.

--
Henri Sivonen
hs******@iki.fi
http://iki.fi/hsivonen/

[Henri Sivonen]

In article <hs****************************@news.dnainternet.n et>,
Henri Sivonen <hs******@iki.fi> wrote:

Thanks. I already wrote a SAX compiler myself, but I have not gotten
around to releasing it yet.

Now released: http://hsivonen.iki.fi/saxcompiler/

--
Henri Sivonen
hs******@iki.fi
http://iki.fi/hsivonen/