for XIncludeHandler.handleIncludeElement included, was Re: xinclude 2003-08-27 - By Peter McCracken
Hi Neil,
Thanks for the patch. I've integrated it with my local copy -- I'll be
submitting a bunch of patches soon. I'll be sure to include credit to you
for the change. I've made a couple changes, foremost being that the
XMLResourceIdentifier is now used only if there is an fEntityResolver. The
relevant section (sorry, not in patch form) look like:
if (fEntityResolver != null) {
try {
XMLResourceIdentifier resourceIdentifier =
new XMLResourceIdentifierImpl(
null,
href,
fDocLocation.getExpandedSystemId(),
XMLEntityManager.expandSystemId(
href,
fDocLocation.getExpandedSystemId(),
false));
includedSource =
fEntityResolver.resolveEntity(resourceIdentifier);
}
catch (IOException e) {
reportResourceError(
"XMLResourceError",
new Object[] { href, e.getMessage()});
return false;
}
}
Cheers,
Peter McCracken/Toronto/IBM
"Neil Pitman"
<neil.pitman@(protected) To: <xerces-j-user@(protected)
.apache.org>
atico.ca> cc:
Subject: [PATCH] for
XIncludeHandler.handleIncludeElement included, was Re: xinclude funnies
08/27/2003 01:15
PM
Please respond to
xerces-j-user
Hi Bob,
Thanks for you counsel. Indeed, it was my shortcuts are correct URI's that
lay at the root of my problem. Everything fell in place with a "memory:"
in front of the URI's.
The org.apache.xerces.xinclude.XIncludeHandler.handleIncludeElement is
still a problem though. Here is the patch that I implemented to make it
work. What is the protocol for submitting it for due consideration? This
is definately not production quality (I don't know how to handle the
possible exception), but it illustrates the issue.
1009,1015c1009,1021
< XMLResourceIdentifier resourceIdentifier =
< new XMLResourceIdentifierImpl(
< null,
< href,
< fDocLocation.getBaseSystemId(),
< null);
<
---
> // XMLResourceIdentifier resourceIdentifier=
> XMLResourceIdentifier resourceIdentifier;
> try {
> resourceIdentifier =
> new XMLResourceIdentifierImpl(
> null,
> href,
> fDocLocation.getBaseSystemId(),
> XMLEntityManager.expandSystemId(href, fDocLocation.getBaseSystemId(),
false));
> } catch (MalformedURIException e1) {
> throw new XIncludeFatalError ("who knows",new Object[0]);
> }
> // null);
1044a1051
> fChildConfig.setEntityResolver(fEntityResolver);
_________________________________________
Neil Pitman
neil.pitman@(protected)
+1.514.863.5465
ICQ#: 21101052
_________________________________________
----- Original Message -----
From: Bob Foster
To: xerces-j-user@(protected) ; Neil Pitman
Sent: Saturday, August 23, 2003 3:10 PM
Subject: Re: xinclude funnies
Hi Neil,
I can't give you any answers about handleIncludeElement and the null ids,
though it sounds odd.
Your other troubles seem to be not using URIs properly. Unless Xerces is
misbehaving (and it's been broken before in this way, so it is a
possibility) it will construct an absolute URI from the base URI of the
document being parsed and the relative paths you are using in your
XInclude directory. (If you don't like what it does with relative paths,
use absolute paths. An absolute URI always has a scheme. But I'll go on
with the relative URI example.) If Xerces has a null base URI, it picks
some pseudo-random directory to be relative to - never one you might like
- so the moral of this story is make sure it knows the document location.
If you supply the EntityResolver, then you can make the base URI any
well-formed thing you want. In particular, you can invent your own scheme
for your EntityResolver to interpret. For example, if you give it
"memory:docname" as a base URI and a relative URI in the XInclude of
part1/subpart1/abc.xml, your resolver should get
"memory:part1/subpart1/abc.xml" as the URI to resolve, and so on.
Bob Foster
----- Original Message -----
From: Neil Pitman
To: xerces-j-user@(protected)
Sent: Saturday, August 23, 2003 8:35 AM
Subject: xinclude funnies
I'll preface this with "I'm a bit new to digging around in Xerces and
XInclude". (Xerces always worked, but then I wasn't using new, beta
features.)
I'm trying to make Saxon 7.6.5 (XSLT) work with Xerces 2.5.0 (tarball not
recent cvs) using XInclude and SAX with my own
XMLEntityResolvers/EntityResolvers. Saxon has it's own issues but that's
for another mailinglist. Once upon a time, I would preprocess my files
with Elliot Rusty Harold's Xincluder from SourceForge into a separate
XML. Now I'd like to stream it in situ. (that means that the input
files are understandable by elharo's implementation so they are less
suspect). The trick is to change the OS based file references into
arbitrary key references.
Here is what I understand. My questions follow.
Soon after hitting the include element,
org.apache.xerces.xinclude.XIncludeHandler.handleIncludeElement(
XMLAttributes attributes) is called. He creates a XMLResourceIdentifier
with an explicit null public id and an explicit null expanded system id
(the literal system id is retrieved from the href and represents a
relative "file". This is what I used to use with XIncluder). When he
determines that there is, indeed, a resolver, he calls
EntityResolverWrapper holding my resolver. First the wrapper checks that
the public id and system id (the expanded one) are not null. They are so
he exits immediately.
I "fixed" this using XMLEntityManager.expandSystemId() to produce the
expanded system id in handleIncludeElement where the
XMLResourceIdentifier is first created.
Now with the EntityResolverWrapper getting a reasonable system id, my
resolver gets a reasonable id and it attempts to load the first xinclude.
The system id's are now a mixture of my keys and file bases. My entity
resolver is completely memory based so the file based URI's are
confusing. For example:
In the old system running from the file system there were three files
file:///c:/work/proj/main.xml
file:///c:/work/proj/part1/subpart1/abc.xml
file:///c:/work/proj/part1/subpart1/helper.xml
With the elharo xincluder, main.xml had <xi:include
href="part1/subpart1/abc.xml"/> and abc.xml contained <xi:include
href="methods.xml"/>. My Resolver receives
file:///c:/home/npitman/part1/subpart1/abc.xml. It gets the "
file:///c:/home/npitman/" part from the running location of the
application. XMLEntityManager noticed that the base system id of
"main.xml" was null so he assumed that he would need a real URI and that
should be based on the current working directory. In the memory-based
situation, the hrefs are not so much URI's as keys. I'm expecting just
"part1/subpart1/abc.xml".
This is what I find in the literal system id. Unfortunately, this helps
little because the first include xincludes a second. This has an href of
"helper.xml". In my key system, I'd expect to see
"part1/subpart1/helper.xml".
Questions:
1) What is going on in
org.apache.xerces.xinclude.XIncludeHandler.handleIncludeElement? Setting
the id's to null can't be right.
2) Is there a way to accept a blank base system id?
I'd like href="part1/subpart1/abc.xml" within "main.xml" to try to
resolve "part1/subpart1/abc.xml" and href="helper.xml" within
"part1/subpart1/abc.xml" to try to resolve "part1/subpart1/help.xml".
3) Alternately, is the there an extension mechanism, like the
EntityResolver, to externalize expandSystemId()?
I suppose that the fallback would be to set the base system id of
main.xml to an abitrary scheme like "npitman://" and the look up
"npitman://part1/subpart1/abc.xml" and
"npitman://part1/subpart1/helper.xml"
Thanks for your patience in reading.
_________________________________________
Neil Pitman
neil.pitman@(protected)
+1.514.863.5465
ICQ#: 21101052
_________________________________________
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