private static PsiAnnotationMemberValue[] readFromClass(
@NonNls String attributeName, @NotNull PsiAnnotation magic, PsiType type) {
PsiAnnotationMemberValue fromClassAttr = magic.findAttributeValue(attributeName);
PsiType fromClassType =
fromClassAttr instanceof PsiClassObjectAccessExpression
? ((PsiClassObjectAccessExpression) fromClassAttr).getOperand().getType()
: null;
PsiClass fromClass =
fromClassType instanceof PsiClassType ? ((PsiClassType) fromClassType).resolve() : null;
if (fromClass == null) return null;
String fqn = fromClass.getQualifiedName();
if (fqn == null) return null;
List<PsiAnnotationMemberValue> constants = new ArrayList<PsiAnnotationMemberValue>();
for (PsiField field : fromClass.getFields()) {
if (!field.hasModifierProperty(PsiModifier.PUBLIC)
|| !field.hasModifierProperty(PsiModifier.STATIC)
|| !field.hasModifierProperty(PsiModifier.FINAL)) continue;
PsiType fieldType = field.getType();
if (!Comparing.equal(fieldType, type)) continue;
PsiAssignmentExpression e =
(PsiAssignmentExpression)
JavaPsiFacade.getElementFactory(field.getProject())
.createExpressionFromText("x=" + fqn + "." + field.getName(), field);
PsiReferenceExpression refToField = (PsiReferenceExpression) e.getRExpression();
constants.add(refToField);
}
if (constants.isEmpty()) return null;
return constants.toArray(new PsiAnnotationMemberValue[constants.size()]);
}
