Class StringTemplate.Aggregate

java.lang.Object
org.antlr.stringtemplate.StringTemplate.Aggregate
Enclosing class:
StringTemplate

public static final class StringTemplate.Aggregate extends Object
An automatically created aggregate of properties. I often have lists of things that need to be formatted, but the list items are actually pieces of data that are not already in an object. I need ST to do something like: Ter=3432 Tom=32234 .... using template: $items:{it.name$=$it.type$}$ This example will call getName() on the objects in items attribute, but what if they aren't objects? I have perhaps two parallel arrays instead of a single array of objects containing two fields. One solution is allow Maps to be handled like properties so that it.name would fail getName() but then see that it's a Map and do it.get("name") instead. This very clean approach is espoused by some, but the problem is that it's a hole in my separation rules. People can put the logic in the view because you could say: "go get bob's data" in the view: Bob's Phone: $db.bob.phone$ A view should not be part of the program and hence should never be able to go ask for a specific person's data. After much thought, I finally decided on a simple solution. I've added setAttribute variants that pass in multiple property values, with the property names specified as part of the name using a special attribute name syntax: "name.{propName1,propName2,...}". This object is a special kind of HashMap that hopefully prevents people from passing a subclass or other variant that they have created as it would be a loophole. Anyway, the ASTExpr.getObjectProperty() method looks for Aggregate as a special case and does a get() instead of getPropertyName.
  • Field Details

    • properties

      protected HashMap properties
  • Constructor Details

    • Aggregate

      public Aggregate()
  • Method Details

    • put

      protected void put(String propName, Object propValue)
      Allow StringTemplate to add values, but prevent the end user from doing so.
    • get

      public Object get(String propName)
    • toString

      public String toString()
      Overrides:
      toString in class Object