> Hi Bob,
>
> In the end, I ended up with a much more brutal low-tech approach that
> involves updating the velocity model directly, it does one extra pass to
> try to resolve embedded symbols. Here is the code...
>
> ...
> protected String applyMapValuesToTemplate(String template,
> Map<String,Object> mapValues) {
> final String DELIMITER_PREFIX = "${";
> final String DELIMITER_SUFFIX = "}";
> for (String key : mapValues.keySet()) {
> String matchKey = DELIMITER_PREFIX + key + DELIMITER_SUFFIX;
> if (template.contains(matchKey)) {
> template = template.replace(matchKey, (String)
> mapValues.get(key));
> }
> }
> return template;
> }
>
> ....
> // various calls to addModel including my Strings with embedded variable
> ....
>
> for (String key : ((Map<String,Object>) getModel()).keySet()) {
> String value = getModel().get(key).toString();
> if (value.contains("${") &&
> value.contains("}") &&
> value.indexOf("${") <
> value.indexOf("}")) {
> value = applyMapValuesToTemplate(value, getModel());
> getModel().put(key, value);
> }
> }
>
> Cheers,
> -G
> __
> --- == __/ t.O ==--
>
http://stacktrace.org/>
>
> On Tue, Jul 21, 2009 at 6:12 PM, Bob Schellink <
[hidden email]
> <mailto:
[hidden email]>> wrote:
>
> Hi Garth,
>
> I've been wondering about this today. The most obvious solution is
> probably to use Java's MessageFormat and replace the property
> variables before adding them to the model. Off course MessageFormat
> doesn't support named parameters, only numeric ones. So you have to use:
>
> Intro=Hello {0}, welcome to the app
>
> Alternatively you might want to look at Velocity Renderable[1]
> interface. Its new in 1.6.
>
> Normally Velocity will invoke the toString() method of the variable
> it finds in the template. However if the variable implements
> Renderable, Velocity will invoke a callback method which allows you
> to manipulate the output as needed.
>
> I haven't used this Velocity feature yet but it seems quite powerful.
>
> Let us know what solution you end up using.
>
> kind regards
>
> bob
>
> [1]:
http://velocity.apache.org/engine/devel/apidocs/org/apache/velocity/runtime/Renderable.html>
>
> Garth Dahlstrom wrote:
>
> Hi
> I'm wondering if there is a recommended approach to replacing
> variables that occur within other variables.
>
> I have text which I add to the model that comes from a
> properties file that looks like:
> Intro=Hello ${Name}, welcome to the application
> Name=John
>
> I could break up intro into chunks in my template, but that will
> make things slightly more difficult to maintain, particularily
> when I send it for translation.
>
> So, is there a way to get model-variable subsitution to run a
> second time or a way for me to change the to-be-rendered output
> to acomplish something like this?
>
> Thanks,
> -G
>
>
>
