public WildcardType getWildcardType(TypeMirror extendsBound, TypeMirror superBound) { BoundKind bkind; Type bound; if (extendsBound == null && superBound == null) { bkind = BoundKind.UNBOUND; bound = syms.objectType; } else if (superBound == null) { bkind = BoundKind.EXTENDS; bound = (Type) extendsBound; } else if (extendsBound == null) { bkind = BoundKind.SUPER; bound = (Type) superBound; } else { throw new IllegalArgumentException("Extends and super bounds cannot both be provided"); } switch (bound.getKind()) { case ARRAY: case DECLARED: case ERROR: case TYPEVAR: return new Type.WildcardType(bound, bkind, syms.boundClass); default: throw new IllegalArgumentException(bound.toString()); } }