From 871af6a15ec10c5df170955f5d65285a3f6982fb Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Wed, 27 Apr 2011 21:46:54 +0200
Subject: [PATCH] =?utf8?q?Add=20method=20to=20check=20a=20post=E2=80=99s?=
 =?utf8?q?=20visibility.?=
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---
 .../sone/notify/ListNotificationFilters.java       | 49 ++++++++++++++++++++++
 1 file changed, 49 insertions(+)

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
--- 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;
+	}
+
 }
-- 
2.7.4