Add post reply provider interface.

diff --git a/src/main/java/net/pterodactylus/sone/core/PostReplyProvider.java b/src/main/java/net/pterodactylus/sone/core/PostReplyProvider.java
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+++ b/src/main/java/net/pterodactylus/sone/core/PostReplyProvider.java
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+/*
+ * Sone - PostReplyProvider.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.core;
+
+import java.util.List;
+
+import net.pterodactylus.sone.data.Post;
+import net.pterodactylus.sone.data.PostReply;
+
+/**
+ * Interface for objects that can provide {@link PostReply}s.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public interface PostReplyProvider {
+
+       /**
+        * Returns the reply with the given ID.
+        *
+        * @param id
+        *            The ID of the reply to get
+        * @return The reply, or {@code null} if there is no such reply
+        */
+       public PostReply getPostReply(String id);
+
+       /**
+        * Returns all replies for the given post, order ascending by time.
+        *
+        * @param post
+        *            The post to get all replies for
+        * @return All replies for the given post
+        */
+       public List<PostReply> getReplies(Post post);
+
+}