1 files changed, 35 insertions, 0 deletions
diff --git a/app/src/main/java/net/lacolaco/smileessence/view/adapter/OrderedCustomListAdapter.kt b/app/src/main/java/net/lacolaco/smileessence/view/adapter/OrderedCustomListAdapter.kt
new file mode 100644
index 00000000..53b1c824
--- /dev/null
+++ b/app/src/main/java/net/lacolaco/smileessence/view/adapter/OrderedCustomListAdapter.kt
@@ -0,0 +1,35 @@
+package net.lacolaco.smileessence.view.adapter
+
+import net.lacolaco.smileessence.entity.IdObject
+
+import java.util.*
+
+abstract class OrderedCustomListAdapter<T : IdObject>
+constructor(comparator: Comparator<Long> = Comparator { x, y -> java.lang.Long.compare(x, y) }) : CustomListAdapter<T>() {
+    private val treeMap: MutableMap<Long, T> = TreeMap(Collections.reverseOrder(comparator))
+
+    override val list: List<T>
+        @Synchronized get() = ArrayList(treeMap.values)
+
+    @Synchronized
+    fun add(item: T) {
+        treeMap.put(item.id, item)
+    }
+
+    @Synchronized
+    fun addAll(items: Collection<T>) {
+        for (item in items) {
+            treeMap.put(item.id, item)
+        }
+    }
+
+    @Synchronized
+    fun clear() {
+        treeMap.clear()
+    }
+
+    @Synchronized
+    fun remove(item: T): T {
+        return treeMap.remove(item.id)!!
+    }
+}