private PsiMember getCause(final MemberInfo member) {
        PsiMember cause = myMember2CauseMap.get(member);

        if (cause != null) return cause;

        final BackpointerUsageVisitor visitor;
        if (member.isChecked()) {
          visitor = new BackpointerUsageVisitor(getFieldsToExtract(), getClassesToExtract(), getMethodsToExtract(), sourceClass);
        }
        else {
          visitor =
            new BackpointerUsageVisitor(getMembersToExtract(false, PsiField.class), getMembersToExtract(false, PsiClass.class),
                                        getMembersToExtract(false, PsiMethod.class), sourceClass, false);
        }

        member.getMember().accept(visitor);
        cause = visitor.getCause();
        myMember2CauseMap.put(member, cause);
        return cause;
      }
private PsiMember getCause(final MemberInfo member)