Added defaultViews property.

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/view/ContentNegotiatingViewResolver.java

@@ -37,9 +37,10 @@ import org.springframework.core.OrderComparator;
 import org.springframework.core.Ordered;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.Resource;
+import org.springframework.http.MediaType;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
-import org.springframework.http.MediaType;
+import org.springframework.util.CollectionUtils;
 import org.springframework.util.StringUtils;
 import org.springframework.web.context.request.RequestAttributes;
 import org.springframework.web.context.request.RequestContextHolder;
@@ -73,7 +74,11 @@ import org.springframework.web.util.WebUtils;
  * {@code text/html} content type (based on the {@code html} file extension). A request for {@code /view} with a {@code
  * text/html} request {@code Accept} header has the same result.
  *
+ * <p>Additionally, this view resolver exposes the {@link #setDefaultViews(List) defaultViews} property, allowing you to
+ * override the views provided by the view resolvers.
+ *
  * @author Arjen Poutsma
+ * @author Jeremy Grelle
  * @see ViewResolver
  * @see InternalResourceViewResolver
  * @see BeanNameViewResolver
@@ -94,6 +99,8 @@ public class ContentNegotiatingViewResolver extends WebApplicationObjectSupport
 
 	private ConcurrentMap<String, MediaType> mediaTypes = new ConcurrentHashMap<String, MediaType>();
 
+	private List<View> defaultViews;
+
 	private List<ViewResolver> viewResolvers;
 
 	public void setOrder(int order) {
@@ -131,6 +138,13 @@ public class ContentNegotiatingViewResolver extends WebApplicationObjectSupport
 		}
 	}
 
+	/**
+	 * Sets the default views to use when a more specific view can not be obtained from the {@link ViewResolver} chain.
+	 */
+	public void setDefaultViews(List<View> defaultViews) {
+		this.defaultViews = defaultViews;
+	}
+
 	/**
 	 * Sets the view resolvers to be wrapped by this view resolver.
 	 *
@@ -235,16 +249,23 @@ public class ContentNegotiatingViewResolver extends WebApplicationObjectSupport
 		Collections.sort(requestedMediaTypes);
 
 		SortedMap<MediaType, View> views = new TreeMap<MediaType, View>();
+		List<View> candidateViews = new ArrayList<View>();
 		for (ViewResolver viewResolver : viewResolvers) {
 			View view = viewResolver.resolveViewName(viewName, locale);
 			if (view != null) {
-				MediaType viewMediaType = MediaType.parseMediaType(view.getContentType());
+				candidateViews.add(view);
-				for (MediaType requestedMediaType : requestedMediaTypes) {
+			}
-					if (requestedMediaType.includes(viewMediaType)) {
+		}
-						if (!views.containsKey(requestedMediaType)) {
+		if (!CollectionUtils.isEmpty(defaultViews)) {
-							views.put(requestedMediaType, view);
+			candidateViews.addAll(defaultViews);
-							break;
+		}
-						}
+		for (View candidateView : candidateViews) {
+			MediaType viewMediaType = MediaType.parseMediaType(candidateView.getContentType());
+			for (MediaType requestedMediaType : requestedMediaTypes) {
+				if (requestedMediaType.includes(viewMediaType)) {
+					if (!views.containsKey(requestedMediaType)) {
+						views.put(requestedMediaType, candidateView);
+						break;
 					}
 				}
 			}

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/view/ContentNegotiatingViewResolverTests.java

@@ -18,23 +18,26 @@ package org.springframework.web.servlet.view;
 
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Locale;
+import java.util.Map;
 
 import static org.easymock.EasyMock.*;
-import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.*;
-import static org.junit.Assert.assertSame;
 import org.junit.Before;
 import org.junit.Test;
 
-import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.http.MediaType;
+import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.web.context.request.RequestContextHolder;
 import org.springframework.web.context.request.ServletRequestAttributes;
 import org.springframework.web.servlet.View;
 import org.springframework.web.servlet.ViewResolver;
 
-/** @author Arjen Poutsma */
+/**
+ * @author Arjen Poutsma
+ */
 public class ContentNegotiatingViewResolverTests {
 
 	private ContentNegotiatingViewResolver viewResolver;
@@ -109,7 +112,45 @@ public class ContentNegotiatingViewResolverTests {
 
 		verify(viewResolverMock1, viewResolverMock2, viewMock1, viewMock2);
 	}
-	
+
+	@Test
+	public void resolveViewNameAcceptHeaderDefaultView() throws Exception {
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/test");
+		request.addHeader("Accept", "application/json");
+		RequestContextHolder.setRequestAttributes(new ServletRequestAttributes(request));
+
+		ViewResolver viewResolverMock1 = createMock(ViewResolver.class);
+		ViewResolver viewResolverMock2 = createMock(ViewResolver.class);
+		List<ViewResolver> viewResolverMocks = new ArrayList<ViewResolver>();
+		viewResolverMocks.add(viewResolverMock1);
+		viewResolverMocks.add(viewResolverMock2);
+		viewResolver.setViewResolvers(viewResolverMocks);
+
+		View viewMock1 = createMock("application_xml", View.class);
+		View viewMock2 = createMock("text_html", View.class);
+		View viewMock3 = createMock("application_json", View.class);
+
+		List<View> defaultViews = new ArrayList<View>();
+		defaultViews.add(viewMock3);
+		viewResolver.setDefaultViews(defaultViews);
+
+		String viewName = "view";
+		Locale locale = Locale.ENGLISH;
+
+		expect(viewResolverMock1.resolveViewName(viewName, locale)).andReturn(viewMock1);
+		expect(viewResolverMock2.resolveViewName(viewName, locale)).andReturn(viewMock2);
+		expect(viewMock1.getContentType()).andReturn("application/xml");
+		expect(viewMock2.getContentType()).andReturn("text/html;charset=ISO-8859-1");
+		expect(viewMock3.getContentType()).andReturn("application/json");
+
+		replay(viewResolverMock1, viewResolverMock2, viewMock1, viewMock2, viewMock3);
+
+		View result = viewResolver.resolveViewName(viewName, locale);
+		assertSame("Invalid view", viewMock3, result);
+
+		verify(viewResolverMock1, viewResolverMock2, viewMock1, viewMock2, viewMock3);
+	}
+
 	@Test
 	public void resolveViewNameFilename() throws Exception {
 		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/test.html");
@@ -141,4 +182,45 @@ public class ContentNegotiatingViewResolverTests {
 		verify(viewResolverMock1, viewResolverMock2, viewMock1, viewMock2);
 	}
 
+	@Test
+	public void resolveViewNameFilenameDefaultView() throws Exception {
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/test.json");
+		RequestContextHolder.setRequestAttributes(new ServletRequestAttributes(request));
+
+		Map<String, String> mediaTypes = new HashMap<String, String>();
+		mediaTypes.put("json", "application/json");
+		viewResolver.setMediaTypes(mediaTypes);
+
+		ViewResolver viewResolverMock1 = createMock(ViewResolver.class);
+		ViewResolver viewResolverMock2 = createMock(ViewResolver.class);
+		List<ViewResolver> viewResolverMocks = new ArrayList<ViewResolver>();
+		viewResolverMocks.add(viewResolverMock1);
+		viewResolverMocks.add(viewResolverMock2);
+		viewResolver.setViewResolvers(viewResolverMocks);
+
+		View viewMock1 = createMock("application_xml", View.class);
+		View viewMock2 = createMock("text_html", View.class);
+		View viewMock3 = createMock("application_json", View.class);
+
+		List<View> defaultViews = new ArrayList<View>();
+		defaultViews.add(viewMock3);
+		viewResolver.setDefaultViews(defaultViews);
+
+		String viewName = "view";
+		Locale locale = Locale.ENGLISH;
+
+		expect(viewResolverMock1.resolveViewName(viewName, locale)).andReturn(viewMock1);
+		expect(viewResolverMock2.resolveViewName(viewName, locale)).andReturn(viewMock2);
+		expect(viewMock1.getContentType()).andReturn("application/xml");
+		expect(viewMock2.getContentType()).andReturn("text/html;charset=ISO-8859-1");
+		expect(viewMock3.getContentType()).andReturn("application/json");
+
+		replay(viewResolverMock1, viewResolverMock2, viewMock1, viewMock2, viewMock3);
+
+		View result = viewResolver.resolveViewName(viewName, locale);
+		assertSame("Invalid view", viewMock3, result);
+
+		verify(viewResolverMock1, viewResolverMock2, viewMock1, viewMock2, viewMock3);
+	}
+
 }