private void ifMatch(DavRequest request, DavResponse response, DavResource resource)
throws DavException, IOException {
EntityTag[] requestEtags = request.getIfMatch();
if (requestEtags.length == 0) return;
EntityTag resourceEtag = etag(resource);
if (resourceEtag == null) return;
if (EntityTag.matchesAny(resourceEtag, requestEtags)) return;
if (resourceEtag != null) response.setHeader("ETag", resourceEtag.toString());
throw new PreconditionFailedException("If-Match disallows conditional request");
}
private void ifNoneMatch(DavRequest request, DavResponse response, DavResource resource)
throws DavException, IOException {
EntityTag[] requestEtags = request.getIfNoneMatch();
if (requestEtags.length == 0) return;
EntityTag resourceEtag = etag(resource);
if (resourceEtag == null) return;
if (!EntityTag.matchesAny(resourceEtag, requestEtags)) return;
if (resourceEtag != null) response.addHeader("ETag", resourceEtag.toString());
if (deservesNotModified(request)) throw new NotModifiedException();
else throw new PreconditionFailedException("If-None-Match disallows conditional request");
}