Bugfix/issue 152 2 (#154)

* get enum from int

* add webrtc bin test

Author: PertsevRoman

.gitignore

@@ -13,4 +13,6 @@
 
 # NetBeans Files #
 /nbproject/
-nb-configuration.xml
+nb-configuration.xml
+
+.idea

src/org/freedesktop/gstreamer/glib/NativeEnum.java

@@ -1,6 +1,6 @@
-/* 
+/*
  * Copyright (c) 2019 Neil C Smith
- * 
+ *
  * This file is part of gstreamer-java.
  *
  * This code is free software: you can redistribute it and/or modify it under
@@ -23,7 +23,18 @@
  * @param <T> Java enum type
  */
 public interface NativeEnum<T extends Enum<T>> {
-    
+
     public int intValue();
 
+    public static <T extends Enum<T> & NativeEnum<T>> T fromInt(Class<T> type, int intValue) {
+        for (T value : type.getEnumConstants()) {
+            if (value.intValue() == intValue) {
+                return value;
+            }
+        }
+
+        throw new IllegalArgumentException("Value " + intValue + " is unacceptable for " +
+                type.getSimpleName() + " enum");
+    }
+
 }

src/org/freedesktop/gstreamer/webrtc/WebRTCBin.java

@@ -24,6 +24,7 @@
 import org.freedesktop.gstreamer.Promise;
 import org.freedesktop.gstreamer.Structure;
 
+import org.freedesktop.gstreamer.glib.NativeEnum;
 import org.freedesktop.gstreamer.lowlevel.GstAPI.GstCallback;
 
 /**
@@ -262,7 +263,7 @@ public String getTurnServer() {
      * state
      */
     public WebRTCPeerConnectionState getConnectionState() {
-        return (WebRTCPeerConnectionState) get("connection-state");
+        return NativeEnum.fromInt(WebRTCPeerConnectionState.class, (Integer) get("connection-state"));
     }
 
     /**

test/org/freedesktop/gstreamer/WebRTCBinTest.java

@@ -0,0 +1,19 @@
+package org.freedesktop.gstreamer;
+
+import org.freedesktop.gstreamer.glib.NativeEnum;
+import org.freedesktop.gstreamer.webrtc.WebRTCPeerConnectionState;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class WebRTCBinTest {
+    @Test
+    public void connectionStateTest() {
+        assertEquals(NativeEnum.fromInt(WebRTCPeerConnectionState.class, 0), WebRTCPeerConnectionState.NEW);
+        assertEquals(NativeEnum.fromInt(WebRTCPeerConnectionState.class, 1), WebRTCPeerConnectionState.CONNECTING);
+        assertEquals(NativeEnum.fromInt(WebRTCPeerConnectionState.class, 2), WebRTCPeerConnectionState.CONNECTED);
+        assertEquals(NativeEnum.fromInt(WebRTCPeerConnectionState.class, 3), WebRTCPeerConnectionState.DISCONNECTED);
+        assertEquals(NativeEnum.fromInt(WebRTCPeerConnectionState.class, 4), WebRTCPeerConnectionState.FAILED);
+        assertEquals(NativeEnum.fromInt(WebRTCPeerConnectionState.class, 5), WebRTCPeerConnectionState.CLOSED);
+    }
+}