// - note: at this point, the URI is transformed into plural (added `s`) in a hardcoded way - this
// will change in the future
final void addLinkHeaderOnPagedResourceRetrieval(
final UriComponentsBuilder uriBuilder,
final HttpServletResponse response,
final Class clazz,
final int page,
final int totalPages,
final int pageSize) {
plural(uriBuilder, clazz);
final StringBuilder linkHeader = new StringBuilder();
if (hasNextPage(page, totalPages)) {
final String uriForNextPage = constructNextPageUri(uriBuilder, page, pageSize);
linkHeader.append(LinkUtil.createLinkHeader(uriForNextPage, LinkUtil.REL_NEXT));
}
if (hasPreviousPage(page)) {
final String uriForPrevPage = constructPrevPageUri(uriBuilder, page, pageSize);
appendCommaIfNecessary(linkHeader);
linkHeader.append(LinkUtil.createLinkHeader(uriForPrevPage, LinkUtil.REL_PREV));
}
if (hasFirstPage(page)) {
final String uriForFirstPage = constructFirstPageUri(uriBuilder, pageSize);
appendCommaIfNecessary(linkHeader);
linkHeader.append(LinkUtil.createLinkHeader(uriForFirstPage, LinkUtil.REL_FIRST));
}
if (hasLastPage(page, totalPages)) {
final String uriForLastPage = constructLastPageUri(uriBuilder, totalPages, pageSize);
appendCommaIfNecessary(linkHeader);
linkHeader.append(LinkUtil.createLinkHeader(uriForLastPage, LinkUtil.REL_LAST));
}
if (linkHeader.length() > 0) {
response.addHeader(HttpHeaders.LINK, linkHeader.toString());
}
}
void addLinkHeaderOnSingleResourceRetrieval(final HttpServletResponse response) {
final String requestURL =
ServletUriComponentsBuilder.fromCurrentRequestUri().build().toUri().toASCIIString();
final int positionOfLastSlash = requestURL.lastIndexOf("/");
final String uriForResourceCreation = requestURL.substring(0, positionOfLastSlash);
final String linkHeaderValue = LinkUtil.createLinkHeader(uriForResourceCreation, "collection");
response.addHeader(HttpHeaders.LINK, linkHeaderValue);
}
