- adapts providers to accept lower bounded wilcard callbacks

Author: baywet

src/main/java/com/microsoft/graph/http/BaseStreamRequest.java

@@ -95,7 +95,7 @@ protected InputStream send() throws ClientException {
      * @param callback     the callback when this request complements. The caller needs to close the stream
      */
     @SuppressWarnings("unchecked")
-    protected void send(final byte[] fileContents, final ICallback<T> callback) {
+    protected void send(final byte[] fileContents, final ICallback<? super T> callback) {
         baseRequest.setHttpMethod(HttpMethod.PUT);
         baseRequest.getClient().getHttpProvider().send(this, callback, (Class<T>) baseRequest.getResponseType(), fileContents);
     }

src/main/java/com/microsoft/graph/http/CoreHttpProvider.java

@@ -141,7 +141,7 @@ public ISerializer getSerializer() {
 	 */
 	@Override
 	public <Result, Body> void send(final IHttpRequest request,
-			final ICallback<Result> callback,
+			final ICallback<? super Result> callback,
 			final Class<Result> resultClass,
 			final Body serializable) {
 		final IProgressCallback<Result> progressCallback;

src/main/java/com/microsoft/graph/http/DefaultHttpProvider.java

@@ -157,7 +157,7 @@ public ISerializer getSerializer() {
      */
     @Override
     public <Result, Body> void send(final IHttpRequest request,
-                                    final ICallback<Result> callback,
+                                    final ICallback<? super Result> callback,
                                     final Class<Result> resultClass,
                                     final Body serializable) {
         final IProgressCallback<Result> progressCallback;

src/main/java/com/microsoft/graph/http/IHttpProvider.java

@@ -69,7 +69,7 @@ public interface IHttpProvider {
      * @param <BodyType>   the type of the object to send to the service in the body of the request
      */
     <Result, BodyType> void send(final IHttpRequest request,
-                                 final ICallback<Result> callback,
+                                 final ICallback<? super Result> callback,
                                  final Class<Result> resultClass,
                                  final BodyType serializable);