Merge the matrix-java-sdk due to it no longer maintained. Remove thirdparty repositories.

src/main/java/io/kamax/matrix/event/EventKey.java

@@ -0,0 +1,88 @@
+/*
+ * matrix-java-sdk - Matrix Client SDK for Java
+ * Copyright (C) 2018 Kamax Sarl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.matrix.event;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+
+import io.kamax.matrix.MalformedEventException;
+import io.kamax.matrix.json.GsonUtil;
+
+import java.util.Optional;
+
+public enum EventKey {
+
+    AuthEvents("auth_events"),
+    Content("content"),
+    Depth("depth"),
+    Hashes("hashes"),
+    Id("event_id"),
+    Origin("origin"),
+    Timestamp("origin_server_ts"),
+    PreviousEvents("prev_events"),
+    PreviousState("prev_state"),
+    RoomId("room_id"),
+    Sender("sender"),
+    Signatures("signatures"),
+    StateKey("state_key"),
+    Type("type"),
+    Membership("membership"),
+    Unsigned("unsigned");
+
+    private String key;
+
+    EventKey(String key) {
+        this.key = key;
+    }
+
+    public String get() {
+        return key;
+    }
+
+    public JsonObject getObj(JsonObject o) {
+        return findObj(o).orElseThrow(() -> new MalformedEventException(key));
+    }
+
+    public JsonElement getElement(JsonObject o) {
+        return GsonUtil.findElement(o, key).orElseThrow(() -> new MalformedEventException(key));
+    }
+
+    public Optional<JsonObject> findObj(JsonObject o) {
+        return GsonUtil.findObj(o, key);
+    }
+
+    public Optional<String> findString(JsonObject o) {
+        return GsonUtil.findString(o, key);
+    }
+
+    public String getString(JsonObject o) {
+        return findString(o).orElseThrow(() -> new MalformedEventException(key));
+    }
+
+    public String getStringOrNull(JsonObject o) {
+        return GsonUtil.getStringOrNull(o, key);
+    }
+
+    public long getLong(JsonObject o) {
+        return GsonUtil.getLong(o, key);
+    }
+
+}