Compatibility with org.springframework.web.servlet.view.ContentNegotiatingViewResolver

src/main/java/org/springframework/web/servlet/view/mustache/MustacheView.java

@@ -15,12 +15,13 @@
  */
 package org.springframework.web.servlet.view.mustache;
 
-import com.samskivert.mustache.Template;
 import org.springframework.web.servlet.view.AbstractTemplateView;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+
 import java.io.Writer;
+import java.util.Locale;
 import java.util.Map;
 
 /**
@@ -47,4 +48,16 @@ public void setTemplate(MustacheTemplate template) {
     public MustacheTemplate getTemplate() {
         return template;
     }
+
+	/**
+	 * Check whether the underlying resource that the configured URL points to
+	 * actually exists.
+	 * @param locale the desired Locale that we're looking for
+	 * @return {@code true} if the resource exists (or is assumed to exist);
+	 * {@code false} if we know that it does not exist
+	 * @throws Exception if the resource exists but is invalid (e.g. could not be parsed)
+	 */
+	public boolean checkResource(Locale locale) throws Exception {
+		return template != null;
+	}
 }

src/main/java/org/springframework/web/servlet/view/mustache/MustacheViewResolver.java

@@ -15,6 +15,11 @@
  */
 package org.springframework.web.servlet.view.mustache;
 
+import java.io.FileNotFoundException;
+import java.util.Locale;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.factory.annotation.Required;
 import org.springframework.web.servlet.ViewResolver;
 import org.springframework.web.servlet.view.AbstractTemplateViewResolver;
@@ -24,7 +29,7 @@
  * @author Sean Scanlon <[email protected]>
  */
 public class MustacheViewResolver extends AbstractTemplateViewResolver implements ViewResolver {
-
+	private static Log LOG = LogFactory.getLog(MustacheViewResolver.class);
     private MustacheTemplateFactory templateFactory;
 
     public MustacheViewResolver() {
@@ -39,14 +44,27 @@ protected Class<?> requiredViewClass() {
     @Override
     protected AbstractUrlBasedView buildView(String viewName) throws Exception {
 
-        final MustacheView view = (MustacheView) super.buildView(viewName);
-
-        final MustacheTemplate template = templateFactory.getTemplate(view.getUrl());
-        view.setTemplate(template);
+        MustacheView view = (MustacheView) super.buildView(viewName);
 
+        try {
+        	final MustacheTemplate template = templateFactory.getTemplate(view.getUrl());
+        	view.setTemplate(template);
+        }
+//        catch( FileNotFoundException ex ){
+//        	LOG.debug("Template [" + viewName + "] not found.");
+//        }
+        catch( MustacheTemplateException ex ){
+        	if( ex.getCause() != null && ex.getCause() instanceof FileNotFoundException ){
+        		LOG.debug("Template [" + viewName + "] not found.");
+        		// view = null;
+        	}
+        	else throw ex; // simply rethrow!
+        }
         return view;
     }
 
+
+
     @Required
     public void setTemplateFactory(MustacheTemplateFactory templateFactory) {
         this.templateFactory = templateFactory;

src/test/java/org/springframework/web/servlet/view/mustache/MustacheViewResolverTest.java

@@ -15,14 +15,21 @@
  */
 package org.springframework.web.servlet.view.mustache;
 
+import java.io.FileNotFoundException;
+
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.web.servlet.View;
 
 import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
 import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.verify;
 
 /**
@@ -57,4 +64,30 @@ public void testBuildView() throws Exception {
         verify(templateFactory).getTemplate(viewName);
     }
 
+    @Test
+	public void testBuildViewReturnsNullWhenFileNotFound() throws Exception {
+		/*
+		 * Test the exception is well trapped in the checkResource()
+		 * used by Spring.
+		 * 
+		 */
+		doThrow(new MustacheTemplateException(new FileNotFoundException()))
+				.when(templateFactory).getTemplate(viewName);
+		View view = viewResolver.buildView(viewName);
+
+		/*
+		 * Check the view is a Mustache View!
+		 */
+		assertTrue( view instanceof MustacheView);
+
+		/*
+		 * If the view does not exists, then the template
+		 * is "null" and the "checkResource" will return
+		 * false.
+		 * 
+		 */
+		MustacheView mustacheView = (MustacheView)view;
+		assertNull( mustacheView.getTemplate() );
+		assertFalse( mustacheView.checkResource(null) );
+	}
 }

src/test/java/org/springframework/web/servlet/view/mustache/MustacheViewTest.java

@@ -20,14 +20,19 @@
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.web.servlet.View;
 
 import javax.servlet.http.HttpServletResponse;
+
+import java.io.FileNotFoundException;
 import java.io.PrintWriter;
 import java.util.Collections;
 import java.util.Map;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
 import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.verify;
 
 /**
@@ -68,4 +73,7 @@ public void testRenderMergedTemplateModel() throws Exception {
 
         assertEquals(template, view.getTemplate());
     }
+
+
+
 }