Add filter for replies with posts.

[Sone.git] / src / main / java / net / pterodactylus / sone / data / PostReply.java

diff --git a/src/main/java/net/pterodactylus/sone/data/PostReply.java b/src/main/java/net/pterodactylus/sone/data/PostReply.java
index 36921dd..1dc5f44 100644 (file)
--- a/src/main/java/net/pterodactylus/sone/data/PostReply.java
+++ b/src/main/java/net/pterodactylus/sone/data/PostReply.java
@@ -17,6 +17,9 @@
 
 package net.pterodactylus.sone.data;
 
+import com.google.common.base.Optional;
+import com.google.common.base.Predicate;
+
 /**
  * A reply is like a {@link Post} but can never be posted on its own, it always
  * refers to another {@link Post}.
@@ -26,6 +29,18 @@ package net.pterodactylus.sone.data;
 public interface PostReply extends Reply<PostReply> {
 
        /**
+        * Filter that selects {@link PostReply}s that have a
+        * {@link Optional#isPresent() present} {@link #getPost() post}.
+        */
+       public static final Predicate<PostReply> HAS_POST_FILTER = new Predicate<PostReply>() {
+
+               @Override
+               public boolean apply(PostReply postReply) {
+                       return postReply.getPost().isPresent();
+               }
+       };
+
+       /**
         * Returns the ID of the post this reply refers to.
         *
         * @return The ID of the post this reply refers to