https://issues.apache.org/bugzilla/show_bug.cgi?id=47720
Summary: Find Catalogs using Service Provider Interface
Product: XmlCommons
Version: 1.x
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: Resolver
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Martin von Gagern <[email protected]> 2009-08-21
03:00:04 PDT ---
Developing apps would be greatly simplified if you could simply add some JAR to
the classpath, and a Catalog as generated by the default CatalogManager would
find the catalog within that JAR as well as the documents it references.
To achieve this, I believe a slightly modified version of the Service Provider
Interface would be most suitable.
http://java.sun.com/j2se/1.5.0/docs/guide/jar/jar.html#Service%20Provider
describes that a file under META-INF/services/package.interface.Name should
list qualified names of classes providing said interface.
To work with XML catalogs, you would specify a class name, but instead the name
of a resource. So I think that you should have a file called
"META-INF/services/org.apache.xml.resolver.catalog" which would contain lines
like "my/company/catalog.xml". That catalog could then be located as a
resource, auto-appended to the list of catalogs and parsed along with the
system catalogs.
One could consider placing the catalog itself in the META-INF directory. That,
however, would probably prevent it from being uniquely identified by its name
alone, which might be useful if you want to deal with the catalog yourself,
without using the full CatalogManager framework.
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