diff --git a/app/src/main/java/com/keylesspalace/tusky/viewdata/ChatViewData.kt b/app/src/main/java/com/keylesspalace/tusky/viewdata/ChatViewData.kt
new file mode 100644
index 00000000..23dd38ba
--- /dev/null
+++ b/app/src/main/java/com/keylesspalace/tusky/viewdata/ChatViewData.kt
@@ -0,0 +1,84 @@
+package com.keylesspalace.tusky.viewdata
+
+import com.keylesspalace.tusky.entity.*
+import java.util.*
+
+
+abstract class ChatViewData {
+    abstract fun getViewDataId() : Int
+    abstract fun deepEquals(val o: ChatViewData) : Boolean
+
+    class Concrete(val account : Account,
+        val id: String,
+        val unread: Int,
+        val lastMessage: ChatMessageViewData.Concrete?,
+        val updatedAt: Date ) : ChatViewData() {
+        override fun getViewDataId(): Int {
+            return id.hashCode()
+        }
+
+        override fun deepEquals(o: ChatViewData): Boolean {
+            if (o !is Concrete) return false
+            return o.account == account && o.id == id &&
+                    o.unread == unread &&
+                    (lastMessage != null && o.lastMessage?.deepEquals(lastMessage) ?: false) &&
+                    o.updatedAt == updatedAt
+        }
+
+        override fun hashCode(): Int {
+            return Objects.hash(account, id, unread, lastMessage, updatedAt)
+        }
+    }
+
+    class Placeholder(val id: Int, val isLoading: Boolean) : ChatViewData() {
+        override fun getViewDataId(): Int {
+            return id
+        }
+
+        override fun deepEquals(val o: ChatViewData): Boolean {
+            if( o !is Placeholder ) return false
+            return o.isLoading == isLoading && o.id == id
+        }
+    }
+}
+
+abstract class ChatMessageViewData {
+    abstract fun getViewDataId() : Int
+    abstract fun deepEquals(val o: ChatMessageViewData) : Boolean
+
+    class Concrete(val id: String,
+        val content: String,
+        val chatId: String,
+        val accountId: String,
+        val createdAt: Date,
+        val attachment: Attachment?,
+        val emojis: List<Emoji>) : ChatMessageViewData()
+    {
+        override fun getViewDataId(): Int {
+            return id.hashCode()
+        }
+
+        override fun deepEquals(o: ChatMessageViewData): Boolean {
+            if( o !is Concrete ) return false
+
+            return o.id == id && o.content == content && o.chatId == chatId &&
+                    o.accountId == accountId && o.createdAt == createdAt &&
+                    o.attachment == attachment && o.emojis == emojis
+        }
+
+        override fun hashCode() : Int {
+            return Objects.hash(id, content, chatId, accountId, createdAt, attachment)
+        }
+    }
+
+    class Placeholder(val id: Int, private val isLoading: Boolean) : ChatMessageViewData() {
+        override fun getViewDataId(): Int {
+            return id
+        }
+
+        override fun deepEquals(val o: ChatMessageViewData): Boolean {
+            if( o !is Placeholder) return false
+            return o.isLoading == isLoading && o.id == id
+        }
+    }
+}
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