import java.util.Comparator;
+import com.google.common.base.Optional;
import com.google.common.base.Predicate;
/**
*
* @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
*/
-public interface Post {
+public interface Post extends Identified {
/** Comparator for posts, sorts descending by time. */
public static final Comparator<Post> TIME_COMPARATOR = new Comparator<Post>() {
@Override
public boolean apply(Post post) {
- return post.getTime() <= System.currentTimeMillis();
+ return (post != null) && (post.getTime() <= System.currentTimeMillis());
}
};
public Sone getSone();
/**
+ * Returns the ID of the recipient {@link Sone}, or
+ * {@link Optional#absent()} if this post does not have a recipient.
+ *
+ * @return The ID of the recipient, or {@link Optional#absent()}
+ */
+ public Optional<String> getRecipientId();
+
+ /**
* Returns the recipient of this post, if any.
*
- * @return The recipient of this post, or {@code null}
+ * @return The recipient of this post, or {@link Optional#absent()} if there
+ * is no recipient
*/
- public Sone getRecipient();
+ public Optional<Sone> getRecipient();
/**
* Returns the time of the post.