Converted three classes to kotlin (#1552)

app/src/main/java/org/thoughtcrime/securesms/components/emoji/CompositeEmojiPageModel.kt

@@ -0,0 +1,39 @@
+package org.thoughtcrime.securesms.components.emoji
+
+import android.net.Uri
+import androidx.annotation.AttrRes
+import java.util.LinkedList
+
+class CompositeEmojiPageModel(
+    @field:AttrRes @param:AttrRes private val iconAttr: Int,
+    private val models: List<EmojiPageModel>
+) : EmojiPageModel {
+
+    override fun getKey(): String {
+        return if (models.isEmpty()) "" else models[0].key
+    }
+
+    override fun getIconAttr(): Int { return iconAttr }
+
+    override fun getEmoji(): List<String> {
+        val emojis: MutableList<String> = LinkedList()
+        for (model in models) {
+            emojis.addAll(model.emoji)
+        }
+        return emojis
+    }
+
+    override fun getDisplayEmoji(): List<Emoji> {
+        val emojis: MutableList<Emoji> = LinkedList()
+        for (model in models) {
+            emojis.addAll(model.displayEmoji)
+        }
+        return emojis
+    }
+
+    override fun hasSpriteMap(): Boolean { return false }
+
+    override fun getSpriteUri(): Uri? { return null }
+
+    override fun isDynamic(): Boolean { return false }
+}