DATACMNS-885 - Added XML support for incoming projections based on XMLBeam.

Added an XML flavor of the support added in previous commits based on XML Beam [0].

[0] http://www.xmlbeam.org.

src/test/java/org/springframework/data/web/XmlBeamHttpMessageConverterUnitTests.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright 2016 the original author or authors.
+ *
+ * Licensed 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.springframework.data.web;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.http.HttpInputMessage;
+import org.xmlbeam.annotation.XBRead;
+
+/**
+ * Unit tests for {@link XmlBeamHttpMessageConverter}.
+ * 
+ * @author Oliver Gierke
+ * @soundtrack Dr. Kobayashi Maru & The Mothership Connection - Anthem (EPisode One)
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class XmlBeamHttpMessageConverterUnitTests {
+
+	XmlBeamHttpMessageConverter converter = new XmlBeamHttpMessageConverter();
+
+	@Mock HttpInputMessage message;
+
+	/**
+	 * @see DATACMNS-885
+	 */
+	@Test
+	public void findsTopLevelElements() throws Exception {
+
+		preparePayload("<user><firstname>Dave</firstname><lastname>Matthews</lastname></user>");
+
+		Customer customer = (Customer) converter.read(Customer.class, message);
+
+		assertThat(customer.getFirstname(), is("Dave"));
+		assertThat(customer.getLastname(), is("Matthews"));
+	}
+
+	/**
+	 * @see DATACMNS-885
+	 */
+	@Test
+	public void findsNestedElements() throws Exception {
+
+		preparePayload("<user><username><firstname>Dave</firstname><lastname>Matthews</lastname></username></user>");
+
+		Customer customer = (Customer) converter.read(Customer.class, message);
+
+		assertThat(customer.getFirstname(), is("Dave"));
+		assertThat(customer.getLastname(), is("Matthews"));
+	}
+
+	private void preparePayload(String payload) throws IOException {
+		when(message.getBody()).thenReturn(new ByteArrayInputStream(payload.getBytes()));
+	}
+
+	public interface Customer {
+
+		@XBRead("//firstname")
+		String getFirstname();
+
+		@XBRead("//lastname")
+		String getLastname();
+	}
+}