[jboss-dev-forums] [Design the new POJO MicroContainer] - Using a CompositeMetaType for a Map with String keys?

[scott.stark@jboss.org]

Right now MetaTypeFactory.resolve(Map[String,?].class) returns a TableMetaType. It seems more natural for this to be a CompositeMetaType that does not restrict the item names when the Map has String keys, for example:


  |       MutableCompositeMetaType expected = new MutableCompositeMetaType(HashMap.class.getName(), "HashMap<String,String>");
  |       expected.addItem("key1", "key1", SimpleMetaType.STRING);
  |       expected.addItem("key2", "key2", SimpleMetaType.STRING);
  |       expected.addItem("key3", "key3", SimpleMetaType.STRING);
  |       expected.freeze();
  |       
  |       String[] itemNames = {"key1", "key2", "key3"};
  |       MetaValue[] itemValues = {SimpleValueSupport.wrap("value1"), SimpleValueSupport.wrap("value3"), SimpleValueSupport.wrap("value3")};
  |       CompositeValueSupport mapValue = new CompositeValueSupport(expected, itemNames, itemValues);
  |       MetaValue value1 = mapValue.get("key1");
  | 

A new MapValueSupport could implement this type of CompositeValue. The TableMetaType/TableValue seem very awkward for this type of map. Is there a reason not to support this and require all Maps to be TableMetaType/TableValue?


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