Implement first prototype of GroupMessageValidator

briar-api/src/org/briarproject/api/privategroup/MessageType.java

@@ -0,0 +1,30 @@
+package org.briarproject.api.privategroup;
+
+public enum MessageType {
+	NEW_MEMBER(0),
+	JOIN(1),
+	POST(2);
+
+	int value;
+
+	MessageType(int value) {
+		this.value = value;
+	}
+
+	public static MessageType valueOf(int value) {
+		switch (value) {
+			case 0:
+				return NEW_MEMBER;
+			case 1:
+				return JOIN;
+			case 2:
+				return POST;
+			default:
+				throw new IllegalArgumentException();
+		}
+	}
+
+	public int getInt() {
+		return value;
+	}
+}