Stringtemplate compare strings does not work

Question

Can someone explain why this does not work ?

StringTemplate query = new StringTemplate(\"hello \" +  
                \"$if(param==\\\"val1\\\")$\" +  
              


        

Answer 1

ST doesn't allow computation in the templates. That would make it part of the model.

Answer 2

You can't compare strings inside stringtemplate, unfortunately, but you can send a result of such a comparison into template as a parameter:

StringTemplate query = new StringTemplate("hello " +  
                "$if(paramEquals)$" +  
                " it works! " +  
                "$endif$ " +  
                "world");  
        query.setAttribute("paramEquals", param.equals("val1"));  
        System.out.println("result: "+query.toString());

It might not be what you're looking for, since every time you need to add a comparison you have to pass an extra parameter, and for loops it's even worse. But this is one workaround that may work for simple cases.