I continue to find out new things (new for me) about Velocity.
I am trying to wrap my head around the StringResourceLoader concept,
which sounds like something I've been looking for. Up to now my usage
of Velocity (for this AOL-Instant Messager-based app I've talked about
before) has been to embed each bit of text I want to display in a little
xhtml file loaded by Velocity including merging dynamic text into the file.
It works great, but it has felt a bit like overkill sometimes,
especially with the smaller bits of text. The idea of string resource
loading was floating around the back of mind when I saw this post.
But I find I'm not quite getting the concept of StringResourceLoader as
it is laid out in the javadocs. The documentation there is all about
dynamically loading strings INTO the repository. This is not at all
what I am after. I am after statically loading a bunch of string
resources as opposed to file resources (i.e., multiple string resources
in a file) somewhere where Velocity can find them for later retrieval by
the application.
Is there some sample code or other documentation demonstrating in more
detail the uses of the StringResourceLoader?
Nathan Bubna wrote:
On Tue, Jan 6, 2009 at 3:54 PM, Caleb Jones <calebjo...@gmail.com> wrote:
Following the Javadoc for StringResourceLoader I have my velocity.properties
setup as follows:
-------------------------------
template.encoding = UTF8
input.encoding=UTF-8
output.encoding=UTF-8
velocimacro.library=VM_global_library.vm
resource.loader = string
string.resource.loader.description = Velocity StringResource loader
string.resource.loader.class =
org.apache.velocity.runtime.resource.loader.StringResourceLoader
looks good.
string.resource.loader.repository.class =
org.apache.velocity.runtime.resource.util.StringResourceRepositoryImpl
you don't need this property unless you are using your own repository impl.
--------------------------------
The problem I have is that Velocity cannot find my VM_global_library.vm. I
can see why the StringResourceLoader wouldn't know what to do with
"VM_global_library.vm", but I as per the velocimacro.library docs at
http://velocity.apache.org/engine/devel/developer-guide.html:
----------------------------------
velocimacro.library = VM_global_library.vm
Multi-valued key. Will accept CSV for value. Filename(s) of Velocimacro
library to be loaded when the Velocity Runtime engine starts. These
Velocimacros are accessable to all templates. The file is assumed to be
relative to the root of the file loader resource path.
-----------------------------------
...it doesn't mention how or if this can be configured when using a
StringResourceLoader.
What is the best way to load global macro files when using a
StringResourceLoader?
Depends on if you want to load it from the file system or as a String.
I haven't actually tried the latter, but i think you simply need to
put it into the repository before you init() Velocity. So, somewhere
before Velocity is initialized you should do:
StringResourceLoader.getRepository().putStringResource("VM_global_library.vm",
theMacrosAsAString);
for the former (which actually sounds more like what you want), you
simply need to have another resource loader configured. Note that the
resource.loader property takes a comma separated list of names of
loaders that should be initialized and used. Velocity will check the
resource loaders in the order listed until it finds the requested
file. So, you might do:
velocimacro.library=VM_global_library.vm
resource.loader = string,file
string.resource.loader.class =
org.apache.velocity.runtime.resource.loader.StringResourceLoader
file.resource.loader.class =
org.apache.velocity.runtime.resource.loader.FileResourceLoader
and you can, of course, add a file.resource.loader.path property or
use a different resource loader(s) entirely.
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