DATACMNS-885 - Fixed implementation of canRead(…) for projecting HttpMessageConverters.

Changed the implementation of both the JSON Path and XPath based projecting HttpMessageConverters to make sure the cached decisions don't depend on the media type. Reuse the evaluation of the media type in AbstractHttpMessageConverter.

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

@@ -26,7 +26,9 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.data.web.ProjectingJackson2HttpMessageConverterUnitTests.UnannotatedInterface;
 import org.springframework.http.HttpInputMessage;
+import org.springframework.http.MediaType;
 import org.xmlbeam.annotation.XBRead;
 
 /**
@@ -70,10 +72,45 @@ public class XmlBeamHttpMessageConverterUnitTests {
 		assertThat(customer.getLastname(), is("Matthews"));
 	}
 
+	/**
+	 * @see DATACMNS-885
+	 */
+	@Test
+	public void supportsAnnotatedInterface() {
+		assertThat(converter.canRead(Customer.class, MediaType.APPLICATION_XML), is(true));
+	}
+
+	/**
+	 * @see DATACMNS-885
+	 */
+	@Test
+	public void supportsXmlBasedMediaType() {
+		assertThat(converter.canRead(Customer.class, MediaType.APPLICATION_ATOM_XML), is(true));
+	}
+
+	/**
+	 * @see DATACMNS-885
+	 */
+	@Test
+	public void doesNotSupportUnannotatedInterface() {
+		assertThat(converter.canRead(UnannotatedInterface.class, MediaType.APPLICATION_XML), is(false));
+	}
+
+	/**
+	 * @see DATACMNS-885
+	 */
+	@Test
+	public void supportsInterfaceAfterLookupForDifferrentMediaType() {
+
+		assertThat(converter.canRead(Customer.class, MediaType.APPLICATION_JSON), is(false));
+		assertThat(converter.canRead(Customer.class, MediaType.APPLICATION_XML), is(true));
+	}
+
 	private void preparePayload(String payload) throws IOException {
 		when(message.getBody()).thenReturn(new ByteArrayInputStream(payload.getBytes()));
 	}
 
+	@ProjectedPayload
 	public interface Customer {
 
 		@XBRead("//firstname")
@@ -82,4 +119,6 @@ public class XmlBeamHttpMessageConverterUnitTests {
 		@XBRead("//lastname")
 		String getLastname();
 	}
+
+	public interface UnnannotatedInterface {}
 }