I understand the basics of parsing an XML document with handlers, and
the use of onStart() and onEnd().
However, I write to ask what kinds of information are available when
the onStart() method is triggered.
Background:
I'm processing potentially large XML files that have structures like
<foo feature="value">
<bar>...</bar>
<bar>...</bar>
...
</foo>
wherein I might do well to capture each <bar> element and then detach
it, to avoid keeping too much
XML structure in memory. But before processing (and detaching) all
the <bar> elements, I need
to get the value of the 'feature' attribute in the <foo> start tag.
If I have a handler like this
reader.addHandler("/foo", new ElementHandler() {
public void onStart(ElementPath path) {
// here I'd like to access the value of the 'feature' attribute,
// but WITHOUT retrieving the whole <foo> element
// this seems to work
String val = path.getCurrent().attribute("feature").getValue() ;
// but I worry about calling getCurrent()
}
public void onEnd(ElementPath path) {}
}
reader.addHandler("/foo/bar", new ElementHandler() {
public void onStart(ElementPath path) {}
public void onEnd(ElementPath path) {
Element elmt = path.getCurrent() ;
// do something with this <bar> element
elmt.detach() ;
}
}
Questions:
1. What kinds of information are available when onStart() is
invoked? Are the start-tag attributes accessible without calling
getCurrent()?
2. In the onStart() method, when I invoke
path.getCurrent().attribute("feature").getValue(), does the entire
<foo> element get parsed into memory?
That's what I want to avoid. When I encounter the <foo
feature="value"> start tag, I'd just like to have access to the
attributes.
Many thanks,
Ken
******************************
Kenneth R. Beesley, D.Phil.
P.O. Box 540475
North Salt Lake, UT
84054 USA
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