TypeVariableName.java 文件源码

/**
 * Make a TypeVariableName for the given TypeMirror. This form is used internally to avoid
 * infinite recursion in cases like {@code Enum<E extends Enum<E>>}. When we encounter such a
 * thing, we will make a TypeVariableName without bounds and add that to the {@code typeVariables}
 * map before looking up the bounds. Then if we encounter this TypeVariable again while
 * constructing the bounds, we can just return it from the map. And, the code that put the entry
 * in {@code variables} will make sure that the bounds are filled in before returning.
 */
static com.wrmsr.wava.java.poet.TypeVariableName get(
        TypeVariable mirror, Map<TypeParameterElement, com.wrmsr.wava.java.poet.TypeVariableName> typeVariables)
{
    TypeParameterElement element = (TypeParameterElement) mirror.asElement();
    com.wrmsr.wava.java.poet.TypeVariableName typeVariableName = typeVariables.get(element);
    if (typeVariableName == null) {
        // Since the bounds field is public, we need to make it an unmodifiableList. But we control
        // the List that that wraps, which means we can change it before returning.
        List<TypeName> bounds = new ArrayList<>();
        List<TypeName> visibleBounds = Collections.unmodifiableList(bounds);
        typeVariableName = new com.wrmsr.wava.java.poet.TypeVariableName(element.getSimpleName().toString(), visibleBounds);
        typeVariables.put(element, typeVariableName);
        for (TypeMirror typeMirror : element.getBounds()) {
            bounds.add(TypeName.get(typeMirror, typeVariables));
        }
        bounds.remove(OBJECT);
    }
    return typeVariableName;
}