JSType.java 文件源码

@Override
public JSType getInstantiatedTypeArgument(TypeI supertype) {
  RawNominalType rawType =
      ((JSType) supertype).getNominalTypeIfSingletonObj().getRawNominalType();
  List<String> typeParameters = rawType.getTypeParameters();
  checkState(typeParameters.size() == 1);

  String param = typeParameters.get(0);
  Map<String, JSType> typeMap = new LinkedHashMap<>();
  typeMap.put(param, JSType.fromTypeVar(this.commonTypes, param));

  JSType reinstantiated = rawType.getInstanceAsJSType().substituteGenerics(typeMap);
  Multimap<String, JSType> typeMultimap = LinkedHashMultimap.create();
  reinstantiated.unifyWith(this, typeParameters, typeMultimap);
  return joinManyTypes(this.commonTypes, typeMultimap.get(param));
}