[stringtemplate-interest] Maps vs aggregates vs beans

[Robert Rowland]

If you only have one hashmap and your template was as follows it would
work fine.

StringTemplate t = new StringTemplate("<b>$name.a$ - $name.b$</b>");

So something is behaveing differently depending depending on whether
you a single hashmap or multiple hashmaps set for a given attribute.
I'm guessing this is intended behaviour but others will know the
answer to that better than me.

In situations where you may have 1 or more hashmaps then this is the
work around I've used.

StringTemplate t = new StringTemplate("$name:{n|$if(n)$<b>$it.a$ -
$it.b$</b>$endif$}$");

Then after I've set my 1 or more hashmaps, I go and set an empty one
as well, which is ignored because of the $if(n)$

while(myloopmaybe_0_1_or_many_items) {

Hashmap name = new Hashmap();
name.put("a", "first value");
name.put("b", "second value");
template.setAttribute("name", name);

Hashmap name = new Hashmap();
template.setAttribute("name", name);


On 7/27/06, Steven Byrnes <erewhon at flatland.org> wrote:
> Hi,
>
> I'm running into a problem with aggregates and multi-valued attributes.  Not sure if it's lack of
> understanding on my part or something else... I'm running String Template 2.3b7.
>
> For the following template:
>
>  StringTemplate t = new StringTemplate("$name:{ <b>$it.a$ - $it.b$</b> }$");
>
> if I use 1 or more aggregate attribute calls, it works, e.g.:
>
>  t.setAttribute("name.{a,b}", "foo", "blah");
>  t.setAttribute("name.{a,b}", "bar", "brap");
>
> same thing for a simple bean.  One or more setAttributes() will work.
>
>  t.setAttribute("name", new data("foo", "bar"));  // where data() has getA() and getB() methods
>
> If I use setAttribute() for multiple Hashmaps, it works.  But if I only use one, I get an error, e.g.:
>
>  HashMap<String,String> m = new HashMap<String,String>();
>  m.put("a", "foo"); m.put("b", "blah");
>  t.setAttribute("name", m);
>  System.out.println(t.toString());
>
>  =>
>
>  Class java.lang.String has no such attribute: a in template context [anonymous anonymous]
>  java.lang.NoSuchFieldException: a
>        at java.lang.Class.getField(Class.java:1507)
>        at org.antlr.stringtemplate.language.ASTExpr.rawGetObjectProperty(ASTExpr.java:410)
>        at org.antlr.stringtemplate.language.ASTExpr.getObjectProperty(ASTExpr.java:314)
>  ....
>
> Any ideas?
>
> Thanks,
> Steven
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