CAMEL-11026 RestletProducer should allow multip...

...le values in HTTP Accept header

This adds support for converting from `String` to `MediaType[]` and adds
support for the multiple `MediaType`s for the `Accept` HTTP header.

components/camel-restlet/src/main/java/org/apache/camel/component/restlet/DefaultRestletBinding.java

@@ -55,6 +55,7 @@
 import org.restlet.data.ChallengeResponse;
 import org.restlet.data.ChallengeScheme;
 import org.restlet.data.CharacterSet;
+import org.restlet.data.ClientInfo;
 import org.restlet.data.Form;
 import org.restlet.data.Header;
 import org.restlet.data.MediaType;
@@ -278,15 +279,19 @@ public void populateRestletRequestFromExchange(Request request, Exchange exchang
 
         // accept
         String accept = exchange.getIn().getHeader("Accept", String.class);
+        final ClientInfo clientInfo = request.getClientInfo();
+        final List<Preference<MediaType>> acceptedMediaTypesList = clientInfo.getAcceptedMediaTypes();
         if (accept != null) {
-            MediaType acceptedMediaType = exchange.getContext().getTypeConverter().tryConvertTo(MediaType.class, exchange, accept);
-            if (acceptedMediaType != null) {
-                request.getClientInfo().getAcceptedMediaTypes().add(new Preference<MediaType>(acceptedMediaType));
+            final MediaType[] acceptedMediaTypes = exchange.getContext().getTypeConverter().tryConvertTo(MediaType[].class, exchange, accept);
+            for (final MediaType acceptedMediaType : acceptedMediaTypes) {
+                acceptedMediaTypesList.add(new Preference<MediaType>(acceptedMediaType));
             }
         }
-        MediaType acceptedMediaType = exchange.getIn().getHeader(Exchange.ACCEPT_CONTENT_TYPE, MediaType.class);
-        if (acceptedMediaType != null) {
-            request.getClientInfo().getAcceptedMediaTypes().add(new Preference<MediaType>(acceptedMediaType));
+        final MediaType[] acceptedMediaTypes = exchange.getIn().getHeader(Exchange.ACCEPT_CONTENT_TYPE, MediaType[].class);
+        if (acceptedMediaTypes != null) {
+            for (final MediaType acceptedMediaType : acceptedMediaTypes) {
+                acceptedMediaTypesList.add(new Preference<MediaType>(acceptedMediaType));
+            }
         }
 
     }

components/camel-restlet/src/main/java/org/apache/camel/component/restlet/converter/RestletConverter.java

@@ -18,8 +18,10 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.regex.Pattern;
 
 import org.apache.camel.Converter;
+import org.apache.camel.util.StringHelper;
 import org.restlet.data.MediaType;
 import org.restlet.data.Method;
 
@@ -54,4 +56,17 @@ public static MediaType toMediaType(String name) {
         return MediaType.valueOf(name);
     }
 
+    @Converter
+    public static MediaType[] toMediaTypes(final String name) {
+        final String[] strings = name.split(",");
+        final List<MediaType> answer = new ArrayList<>(strings.length);
+        for (int i = 0; i < strings.length; i++) {
+            final MediaType mediaType = toMediaType(strings[i]);
+            if (mediaType != null) {
+                answer.add(mediaType);
+            }
+        }
+
+        return answer.toArray(new MediaType[answer.size()]);
+    }
 }

components/camel-restlet/src/test/java/org/apache/camel/component/restlet/converter/RestletConverterTest.java

@@ -0,0 +1,41 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.component.restlet.converter;
+
+import org.junit.Test;
+import org.restlet.data.MediaType;
+
+import static org.junit.Assert.assertEquals;
+
+public class RestletConverterTest {
+
+    @Test
+    public void shouldConvertMediaTypes() {
+        final MediaType[] mediaTypes = RestletConverter.toMediaTypes("a/b, c/d");
+
+        assertEquals("Expecting two parsed media types", 2, mediaTypes.length);
+        assertEquals("Expecting first to be a/b", MediaType.valueOf("a/b"), mediaTypes[0]);
+        assertEquals("Expecting second to be c/d", MediaType.valueOf("c/d"), mediaTypes[1]);
+    }
+
+    @Test
+    public void shouldConvertNoMediaTypes() {
+        final MediaType[] mediaTypes = RestletConverter.toMediaTypes("");
+
+        assertEquals("Expecting no parsed media types", 0, mediaTypes.length);
+    }
+}