AnnotationsHighlightUtil.java 文件源码

@Nullable
private static RetentionPolicy getRetentionPolicy(PsiClass annotation) {
  PsiModifierList modifierList = annotation.getModifierList();
  if (modifierList != null) {
    PsiAnnotation retentionAnno = modifierList.findAnnotation(CommonClassNames.JAVA_LANG_ANNOTATION_RETENTION);
    if (retentionAnno == null) return RetentionPolicy.CLASS;

    PsiAnnotationMemberValue policyRef = PsiImplUtil.findAttributeValue(retentionAnno, null);
    if (policyRef instanceof PsiReference) {
      PsiElement field = ((PsiReference)policyRef).resolve();
      if (field instanceof PsiEnumConstant) {
        String name = ((PsiEnumConstant)field).getName();
        try {
          return RetentionPolicy.valueOf(name);
        }
        catch (Exception e) {
          LOG.warn("Unknown policy: " + name);
        }
      }
    }
  }

  return null;
}