#include <atompub/atom.h>
+#include <glib.h>
+
+#include <string.h>
+
struct _atom_backend
{
- Atom * (*retrieve_resource) (AtomCtx *, IRI *);
+ AtomEntry * (*retrieve_entry) (AtomCtx *, AtomID *);
+ void (*enumerate_entries) (AtomCtx *, AtomEntry ***, size_t *);
+ int (*is_feed) (AtomCtx *, AtomID *);
};
+AtomBackend *
+atom_backend_new ()
+{
+ AtomBackend *backend;
+ backend = g_slice_new (AtomBackend);
+ backend->retrieve_entry = NULL;
+ backend->enumerate_entries = NULL;
+ return backend;
+}
+
+void
+atom_backend_delete (AtomBackend *backend)
+{
+ g_slice_free (AtomBackend, backend);
+}
+
+void
+atom_backend_retrieve_entry_set (AtomBackend *backend,
+ AtomEntry *retrieve_entry (AtomCtx *,
+ AtomID *))
+{
+ backend->retrieve_entry = retrieve_entry;
+}
+
+void
+atom_backend_enumerate_entries_set (AtomBackend *backend,
+ void enumerate_entries (AtomCtx *,
+ AtomEntry ***, size_t*))
+{
+ backend->enumerate_entries = enumerate_entries;
+}
+
+void
+atom_backend_is_feed_set (AtomBackend *backend,
+ int is_feed (AtomCtx *, AtomID *))
+{
+ backend->is_feed = is_feed;
+}
-Atom *
-atom_retrieve_resource (AtomCtx *ctx, IRI *iri)
+AtomEntry *
+atom_retrieve_entry (AtomCtx *ctx, AtomID *id)
{
AtomBackend *backend;
backend = atom_backend (ctx);
- if (backend && backend->retrieve_resource)
- return backend->retrieve_resource (ctx, iri);
+ if (backend && backend->retrieve_entry)
+ return backend->retrieve_entry (ctx, id);
return NULL;
}
+
+void
+atom_backend_enumerate_entries (AtomCtx *ctx, AtomEntry *** entries, size_t *len)
+{
+ AtomBackend *backend;
+ backend = atom_backend (ctx);
+ if (backend && backend->enumerate_entries)
+ {
+ backend->enumerate_entries (ctx, entries, len);
+ return;
+ }
+ if (entries)
+ *entries = NULL;
+ if (len)
+ *len = 0;
+}
+
+int
+atom_is_feed (AtomCtx *ctx, AtomID *id)
+{
+ AtomBackend *backend;
+ AtomError *aerr;
+ backend = atom_backend (ctx);
+ if (backend && backend->is_feed)
+ {
+ return backend->is_feed (ctx, id);
+ }
+ /* Frontend may make the decision of whether the requested resource is
+ * a feed or not. If it is not able to do so and backend isn't either,
+ * it is an error.
+ */
+ aerr = atom_error_new ();
+ atom_error_code_set (aerr, 404);
+ atom_error_message_set (aerr, "Not Found");
+ atom_error_set (ctx, aerr);
+ return 0;
+}
+
+AtomFeed *
+atom_retrieve_feed (AtomCtx *ctx)
+{
+ AtomFeed *feed;
+ AtomEntry **entries;
+ size_t len;
+ atom_backend_enumerate_entries (ctx, &entries, &len);
+ if (atom_error_get (ctx) != NULL)
+ return NULL;
+ feed = atom_feed_new ();
+ atom_feed_entry_append_array (feed, entries, len);
+ return feed;
+}
+
+AtomResource *
+atom_retrieve_resource (AtomCtx *ctx, AtomID *id)
+{
+ AtomResource *res;
+ res = NULL;
+ if (atom_is_feed (ctx, id))
+ {
+ AtomFeed *feed;
+ feed = atom_retrieve_feed (ctx);
+ if (feed == NULL)
+ return NULL;
+ res = atom_resource_new_from_feed (feed);
+ atom_feed_delete (feed);
+ }
+ else if (atom_error_get (ctx) != NULL)
+ {
+ AtomEntry *entry;
+ entry = atom_retrieve_entry (ctx, id);
+ if (entry == NULL)
+ return NULL;
+ res = atom_resource_new_from_entry (entry);
+ atom_entry_delete (entry);
+ }
+ return res;
+}