Add method to check a post’s visibility.

diff --git a/src/main/java/net/pterodactylus/sone/notify/ListNotificationFilters.java b/src/main/java/net/pterodactylus/sone/notify/ListNotificationFilters.java
index f2bff09..7491e70 100644 (file)
--- a/src/main/java/net/pterodactylus/sone/notify/ListNotificationFilters.java
+++ b/src/main/java/net/pterodactylus/sone/notify/ListNotificationFilters.java
@@ -24,7 +24,10 @@ import java.util.List;
 import net.pterodactylus.sone.data.Post;
 import net.pterodactylus.sone.data.Reply;
 import net.pterodactylus.sone.data.Sone;
+import net.pterodactylus.sone.freenet.wot.OwnIdentity;
+import net.pterodactylus.sone.freenet.wot.Trust;
 import net.pterodactylus.util.notify.Notification;
+import net.pterodactylus.util.validation.Validation;
 
 /**
  * Filter for {@link ListNotification}s.
@@ -166,4 +169,50 @@ public class ListNotificationFilters {
                return null;
        }
 
+       /**
+        * Checks whether a post is visible to the given Sone. A post is not
+        * considered visible if one of the following statements is true:
+        * <ul>
+        * <li>The post does not have a Sone.</li>
+        * <li>The Sone of the post is not the given Sone, the given Sone does not
+        * follow the post’s Sone, and the given Sone is not the recipient of the
+        * post.</li>
+        * <li>The trust relationship between the two Sones can not be retrieved.</li>
+        * <li>The given Sone has explicitely assigned negative trust to the post’s
+        * Sone.</li>
+        * <li>The given Sone has not explicitely assigned negative trust to the
+        * post’s Sone but the implicit trust is negative.</li>
+        * </ul>
+        * If none of these statements is true the post is considered visible.
+        *
+        * @param sone
+        *            The Sone that checks for a post’s visibility
+        * @param post
+        *            The post to check for visibility
+        * @return {@code true} if the post is considered visible, {@code false}
+        *         otherwise
+        */
+       public static boolean isPostVisible(Sone sone, Post post) {
+               Validation.begin().isNotNull("Sone", sone).isNotNull("Post", post).check().isNotNull("Sone’s Identity", sone.getIdentity()).check().isInstanceOf("Sone’s Identity", sone.getIdentity(), OwnIdentity.class).check();
+               Sone postSone = post.getSone();
+               if (postSone == null) {
+                       return false;
+               }
+               Trust trust = postSone.getIdentity().getTrust((OwnIdentity) sone.getIdentity());
+               if (trust != null) {
+                       if ((trust.getExplicit() != null) && (trust.getExplicit() < 0)) {
+                               return false;
+                       }
+                       if ((trust.getExplicit() == null) && (trust.getImplicit() != null) && (trust.getImplicit() < 0)) {
+                               return false;
+                       }
+               } else {
+                       return false;
+               }
+               if ((!postSone.equals(sone)) && !sone.hasFriend(postSone.getId()) && !sone.equals(post.getRecipient())) {
+                       return false;
+               }
+               return true;
+       }
+
 }