JavaPoet - ParameterizedTypeName with nested ParameterizedTypeName

Question

How can I create following:

HashMap<String, Pair<Boolean, Object>> mHashMap = new HashMap();

I have following:

ParameterizedTypeName subType = ParameterizedTypeName.get(Pair.class, Boolean.class, Object.class);
ParameterizedTypeName mainType = ParameterizedTypeName.get(HashMap.class, String.class, Pair.class);
 builder.addField(
            FieldSpec.builder(mainType, "mHashMap", Modifier.PRIVATE, Modifier.FINAL)
                    .initializer("new HashMap<>()")
                    .build()
    );

How can I now combine the subType with the mainType to get the correct mainType?

I need something like following:

ParameterizedTypeName mainType = ParameterizedTypeName.get(HashMap.class, String.class, subType);

Answer 1

Something like this should work:

ParameterizedTypeName subType = ParameterizedTypeName.get(Pair.class, 
                                                          Boolean.class,
                                                          Object.class);
ClassName string = ClassName.get("java.lang", 
                                 "String");
ClassName hashMap = ClassName.get("java.util", 
                                  "HashMap");
ParameterizedTypeName mainType = ParameterizedTypeName.get(hashMap, 
                                                           string,
                                                           subType);

FieldSpec.builder(mainType, 
                  "mHashMap",
                  Modifier.PRIVATE,
                  Modifier.FINAL)
         .initializer("new HashMap<>()")
         .build();

The code above should generate:

private final HashMap<String, Pair<Boolean, Object>> mHashMap = new HashMap<>();

Hope that helps.