org.antlr.stringtemplate
Class StringTemplate.Aggregate

java.lang.Object
  org.antlr.stringtemplate.StringTemplate.Aggregate

Enclosing class:

StringTemplate

public static final class StringTemplate.Aggregate
extends java.lang.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 Summary

protected java.util.HashMap

properties

Constructor Summary

StringTemplate.Aggregate()

Method Summary

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

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

properties

protected java.util.HashMap properties

Constructor Detail

StringTemplate.Aggregate

public StringTemplate.Aggregate()

Method Detail

put

protected void put(java.lang.String propName,
                   java.lang.Object propValue)

Allow StringTemplate to add values, but prevent the end user from doing so.

get

public java.lang.Object get(java.lang.String propName)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object