X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Fsone%2Fnotify%2FReplyVisibilityFilter.java;fp=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Fsone%2Fnotify%2FReplyVisibilityFilter.java;h=a76ae2501533dbff5abddb3f64f2f7dac0ed95bf;hb=3da1daa6488c642430858a4baacc0aa986a6ebc1;hp=0000000000000000000000000000000000000000;hpb=9f562b1024a26cd8841447c6e29c3d89039d7a22;p=Sone.git

diff --git a/src/main/java/net/pterodactylus/sone/notify/ReplyVisibilityFilter.java b/src/main/java/net/pterodactylus/sone/notify/ReplyVisibilityFilter.java
new file mode 100644
index 0000000..a76ae25
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sone/notify/ReplyVisibilityFilter.java
@@ -0,0 +1,73 @@
+package net.pterodactylus.sone.notify;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import net.pterodactylus.sone.data.Post;
+import net.pterodactylus.sone.data.PostReply;
+import net.pterodactylus.sone.data.Sone;
+
+import com.google.common.base.Optional;
+import com.google.common.base.Predicate;
+
+/**
+ * Filter that checks a {@link PostReply} for visibility.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+@Singleton
+public class ReplyVisibilityFilter {
+
+	private final PostVisibilityFilter postVisibilityFilter;
+
+	@Inject
+	public ReplyVisibilityFilter(@Nonnull PostVisibilityFilter postVisibilityFilter) {
+		this.postVisibilityFilter = postVisibilityFilter;
+	}
+
+	/**
+	 * Checks whether a reply is visible to the given Sone. A reply is not
+	 * considered visible if one of the following statements is true:
+	 * <ul>
+	 * <li>The reply does not have a post.</li>
+	 * <li>The reply’s post {@link PostVisibilityFilter#isPostVisible(Sone, Post) is not visible}.</li>
+	 * <li>The reply’s {@link PostReply#getTime() time} is in the future.</li>
+	 * </ul>
+	 * If none of these statements is true the reply is considered visible.
+	 *
+	 * @param sone
+	 * 		The Sone that checks for a post’s visibility (may be
+	 * 		{@code null} to skip Sone-specific checks, such as trust)
+	 * @param reply
+	 * 		The reply to check for visibility
+	 * @return {@code true} if the reply is considered visible, {@code false}
+	 * otherwise
+	 */
+	boolean isReplyVisible(@Nullable Sone sone, @Nonnull PostReply reply) {
+		checkNotNull(reply, "reply must not be null");
+		Optional<Post> post = reply.getPost();
+		if (!post.isPresent()) {
+			return false;
+		}
+		if (!postVisibilityFilter.isPostVisible(sone, post.get())) {
+			return false;
+		}
+		return reply.getTime() <= System.currentTimeMillis();
+	}
+
+	@Nonnull
+	public Predicate<PostReply> isVisible(@Nullable final Sone currentSone) {
+		return new Predicate<PostReply>() {
+			@Nonnull
+			@Override
+			public boolean apply(@Nullable PostReply postReply) {
+				return isReplyVisible(currentSone, postReply);
+			}
+		};
+	}
+
+}