Allow templates to be added as resolved Views

Also as fully-formed ModelAndView, or (as before) as view name String
to be resolved later.

README.md

@@ -158,6 +158,20 @@ public HtmxResponse getMainAndPartial(Model model){
         }
 ```
 
+An `HtmxResponse` can be formed from view names, as above, or fully resolved `View` instances, if the controller knows how
+to do that, or from `ModelAndView` instances (resolved or unresolved). For example:
+
+```java
+@GetMapping("/partials/main-and-partial")
+public HtmxResponse getMainAndPartial(Model model){
+        return new HtmxResponse()
+        .addTemplate(new ModelAndView("users :: list")
+        .addTemplate(new ModelAndView("users :: count", Map.of("userCount",5));
+        }
+```
+
+Using `ModelAndView` means that each fragment can have its own model (which is merged with the controller model before rendering).
+
 ### Spring Security
 
 The library has an `HxRefreshHeaderAuthenticationEntryPoint` that you can use to have htmx force a full page browser

src/main/java/io/github/wimdeblauwe/hsbt/mvc/HtmxMvcConfiguration.java

@@ -7,7 +7,6 @@
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
 import org.springframework.boot.autoconfigure.web.servlet.WebMvcRegistrations;
-import org.springframework.context.ApplicationContext;
 import org.springframework.util.Assert;
 import org.springframework.web.method.support.HandlerMethodArgumentResolver;
 import org.springframework.web.servlet.LocaleResolver;

src/main/java/io/github/wimdeblauwe/hsbt/mvc/HtmxResponse.java

@@ -1,10 +1,17 @@
 package io.github.wimdeblauwe.hsbt.mvc;
 
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashSet;
+import java.util.Map;
+import java.util.Set;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.util.Assert;
-
-import java.util.*;
+import org.springframework.web.servlet.ModelAndView;
+import org.springframework.web.servlet.View;
 
 /**
  * Representation of HTMX partials.
@@ -15,7 +22,7 @@
 final public class HtmxResponse {
     private static final Logger LOG = LoggerFactory.getLogger(HtmxResponse.class);
 
-	private final Set<String> templates;
+	private final Set<ModelAndView> templates;
 	private final Map<String, String> triggers;
 	private final Map<String, String> triggersAfterSettle;
 	private final Map<String, String> triggersAfterSwap;
@@ -39,6 +46,34 @@ public HtmxResponse() {
 	 */
 	public HtmxResponse addTemplate(String template) {
         Assert.hasText(template, "template should not be blank");
+        if (!templates.stream().anyMatch(mav -> template.equals(mav.getViewName()))) {
+            templates.add(new ModelAndView(template));
+        }
+        return this;
+	}
+
+	/**
+	 * Append the rendered template or fragment as a resolved {@link View}.
+	 *
+	 * @param template must not be {@literal null}.
+	 * @return same HtmxResponse for chaining
+	 */
+	public HtmxResponse addTemplate(View template) {
+        Assert.notNull(template, "template should not be null");
+        if (!templates.stream().anyMatch(mav -> template.equals(mav.getView()))) {
+            templates.add(new ModelAndView(template));
+        }
+        return this;
+	}
+
+	/**
+	 * Append the rendered template or fragment as a {@link ModelAndView}.
+	 *
+	 * @param template must not be {@literal null}.
+	 * @return same HtmxResponse for chaining
+	 */
+	public HtmxResponse addTemplate(ModelAndView template) {
+        Assert.notNull(template, "template should not be null");
         templates.add(template);
         return this;
 	}
@@ -142,8 +177,10 @@ public HtmxResponse retarget(String cssSelector) {
      */
     public HtmxResponse and(HtmxResponse otherResponse){
         otherResponse.templates.forEach(otherTemplate -> {
-            if(!this.templates.add(otherTemplate)) {
+            if(this.templates.stream().anyMatch(mav -> same(otherTemplate, mav))) {
                 LOG.info("Duplicate template '{}' found while merging HtmxResponse", otherTemplate);
+            } else {
+                templates.add(otherTemplate);
             }
         });
         mergeMapAndLog(HxTriggerLifecycle.RECEIVE, this.triggers, otherResponse.triggers);
@@ -166,6 +203,22 @@ public HtmxResponse and(HtmxResponse otherResponse){
         return this;
     }
 
+    private boolean same(ModelAndView one, ModelAndView two) {
+        if (one == two) {
+            return true;
+        }
+        if (one == null || two == null) {
+            return false;
+        }
+        if (one.getViewName() !=null && one.getViewName().equals(two.getViewName())) {
+            return true;
+        }
+        if (one.getView() !=null && one.getView().equals(two.getView())) {
+            return true;
+        }
+        return false;
+    }
+
     private void mergeMapAndLog(HxTriggerLifecycle receive, Map<String, String> triggers, Map<String, String> otherTriggers) {
         otherTriggers.forEach((key, value) -> {
             if(LOG.isInfoEnabled()) {
@@ -179,7 +232,7 @@ private void mergeMapAndLog(HxTriggerLifecycle receive, Map<String, String> trig
     }
 
 
-	Collection<String> getTemplates() {
+	Collection<ModelAndView> getTemplates() {
 		return Collections.unmodifiableCollection(templates);
 	}
 

src/main/java/io/github/wimdeblauwe/hsbt/mvc/HtmxViewHandlerInterceptor.java

@@ -15,22 +15,29 @@
  */
 package io.github.wimdeblauwe.hsbt.mvc;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
-import jakarta.servlet.http.HttpServletRequest;
-import jakarta.servlet.http.HttpServletResponse;
+import java.util.Locale;
+import java.util.Map;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.ObjectFactory;
 import org.springframework.util.Assert;
 import org.springframework.web.method.HandlerMethod;
-import org.springframework.web.servlet.*;
+import org.springframework.web.servlet.HandlerInterceptor;
+import org.springframework.web.servlet.LocaleResolver;
+import org.springframework.web.servlet.ModelAndView;
+import org.springframework.web.servlet.View;
+import org.springframework.web.servlet.ViewResolver;
 import org.springframework.web.util.ContentCachingResponseWrapper;
 
-import java.util.Locale;
-import java.util.Map;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
 
 /**
- * A {@link HandlerInterceptor} that turns {@link HtmxResponse} instances returned from controller methods into a
+ * A {@link HandlerInterceptor} that turns {@link HtmxResponse} instances
+ * returned from controller methods into a
  *
  * @author Oliver Drotbohm
  */
@@ -41,19 +48,24 @@ class HtmxViewHandlerInterceptor implements HandlerInterceptor {
     private final ObjectFactory<LocaleResolver> locales;
     private final ObjectMapper objectMapper;
 
-    public HtmxViewHandlerInterceptor(ViewResolver views, ObjectFactory<LocaleResolver> locales, ObjectMapper objectMapper) {
+    public HtmxViewHandlerInterceptor(ViewResolver views, ObjectFactory<LocaleResolver> locales,
+            ObjectMapper objectMapper) {
         this.views = views;
         this.locales = locales;
         this.objectMapper = objectMapper;
     }
 
     /*
      * (non-Javadoc)
-     * @see org.springframework.web.servlet.HandlerInterceptor#postHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, org.springframework.web.servlet.ModelAndView)
+     * 
+     * @see
+     * org.springframework.web.servlet.HandlerInterceptor#postHandle(javax.servlet.
+     * http.HttpServletRequest, javax.servlet.http.HttpServletResponse,
+     * java.lang.Object, org.springframework.web.servlet.ModelAndView)
      */
     @Override
     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
-                           ModelAndView modelAndView) throws Exception {
+            ModelAndView modelAndView) throws Exception {
 
         if (modelAndView == null || !HandlerMethod.class.isInstance(handler)) {
             return;
@@ -101,7 +113,8 @@ private void addHxHeaders(HtmxResponse htmxResponse, HttpServletResponse respons
         }
     }
 
-    private void setTriggerHeader(HxTriggerLifecycle triggerHeader, Map<String, String> triggers, HttpServletResponse response) {
+    private void setTriggerHeader(HxTriggerLifecycle triggerHeader, Map<String, String> triggers,
+            HttpServletResponse response) {
         if (triggers.isEmpty()) {
             return;
         }
@@ -132,10 +145,18 @@ private View toView(HtmxResponse partials) {
         return (model, request, response) -> {
             Locale locale = locales.getObject().resolveLocale(request);
             ContentCachingResponseWrapper wrapper = new ContentCachingResponseWrapper(response);
-            for (String template : partials.getTemplates()) {
-                View view = views.resolveViewName(template, locale);
+            for (ModelAndView template : partials.getTemplates()) {
+                View view = template.getView();
+                if (view == null) {
+                    view = views.resolveViewName(template.getViewName(), locale);
+                }
+                for (String key: model.keySet()) {
+                    if(!template.getModel().containsKey(key)) {
+                        template.getModel().put(key, model.get(key));
+                    }
+                }
                 Assert.notNull(view, "Template '" + template + "' could not be resolved");
-                view.render(model, request, wrapper);
+                view.render(template.getModel(), request, wrapper);
             }
             wrapper.copyBodyToResponse();
         };

src/test/java/io/github/wimdeblauwe/hsbt/mvc/HtmxPartialHandlerInterceptorTest.java

@@ -1,5 +1,16 @@
 package io.github.wimdeblauwe.hsbt.mvc;
 
+import static io.github.wimdeblauwe.hsbt.mvc.support.PartialXpathResultMatchers.partialXpath;
+import static org.hamcrest.core.StringContains.containsString;
+import static org.mockito.Mockito.when;
+import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.csrf;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.header;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.xpath;
+
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
@@ -8,13 +19,6 @@
 import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.test.web.servlet.result.MockMvcResultHandlers;
 
-import static io.github.wimdeblauwe.hsbt.mvc.support.PartialXpathResultMatchers.partialXpath;
-import static org.mockito.Mockito.when;
-import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.csrf;
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
-
 @WebMvcTest(PartialsController.class)
 @WithMockUser
 class HtmxPartialHandlerInterceptorTest {
@@ -34,6 +38,23 @@ public void testASinglePartialCanBeReturned() throws Exception {
                .andExpect(xpath("/ul[@hx-swap-oob='true']").doesNotExist());
     }
 
+    @Test
+    public void testASingleViewCanBeReturned() throws Exception {
+        mockMvc.perform(get("/partials/view"))
+                .andDo(MockMvcResultHandlers.print())
+               .andExpect(status().isOk())
+               .andExpect(xpath("/ul").exists());
+    }
+
+    @Test
+    public void testASingleModelAndViewCanBeReturned() throws Exception {
+        mockMvc.perform(get("/partials/mav"))
+                .andDo(MockMvcResultHandlers.print())
+               .andExpect(status().isOk())
+               .andExpect(partialXpath("/span[@id='item']").exists())
+               .andExpect(content().string(containsString("Foo")));
+    }
+
     @Test
     public void testAMainChange() throws Exception {
         mockMvc.perform(get("/partials/main-and-partial"))

src/test/java/io/github/wimdeblauwe/hsbt/mvc/HtmxResponseTest.java

@@ -27,7 +27,7 @@ public void addingATemplateShouldWork() {
         String myTemplate = "myTemplate";
         sut.addTemplate(myTemplate);
 
-        assertThat(sut.getTemplates()).containsExactly(myTemplate);
+        assertThat(sut.getTemplates()).extracting(mav -> mav.getViewName()).containsExactly(myTemplate);
     }
 
     @Test
@@ -38,7 +38,7 @@ public void addingTheSameTemplateASecondTimeShouldIgnoreDuplicates() {
         sut.addTemplate(myTemplateAndFragment);
         sut.addTemplate(myTemplate);
 
-        assertThat(sut.getTemplates()).containsExactly(myTemplate, myTemplateAndFragment);
+        assertThat(sut.getTemplates()).extracting(mav -> mav.getViewName()).containsExactly(myTemplate, myTemplateAndFragment);
     }
 
     @Test
@@ -91,7 +91,7 @@ public void addedTemplatesPreserveTheirOrder() {
         sut.addTemplate(template1);
         sut.addTemplate(template2);
 
-        assertThat(sut.getTemplates()).containsExactly(template1, template2);
+        assertThat(sut.getTemplates()).extracting(mav -> mav.getViewName()).containsExactly(template1, template2);
     }
 
     @Test
@@ -103,7 +103,7 @@ public void mergingResponsesPreserveTemplateOrder() {
 
         response1.and(response2);
 
-        assertThat(response1.getTemplates())
+        assertThat(response1.getTemplates()).extracting(mav -> mav.getViewName())
                 .hasSize(4)
                 .containsExactly("response1 :: template 11",
                                  "response1 :: template 12",

src/test/java/io/github/wimdeblauwe/hsbt/mvc/PartialsController.java

@@ -1,11 +1,18 @@
 package io.github.wimdeblauwe.hsbt.mvc;
 
+import static io.github.wimdeblauwe.hsbt.mvc.CommonHtmxResponses.sendAlertPartial;
+
+import java.util.Map;
+
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.servlet.ModelAndView;
+import org.springframework.web.servlet.view.AbstractView;
 
-import static io.github.wimdeblauwe.hsbt.mvc.CommonHtmxResponses.sendAlertPartial;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
 
 @Controller
 public class PartialsController {
@@ -41,6 +48,23 @@ public HtmxResponse getFirstPartials() {
         return new HtmxResponse().addTemplate("users :: list");
     }
 
+    @GetMapping("/partials/view")
+    public HtmxResponse getFirstView() {
+        return new HtmxResponse().addTemplate(new AbstractView() {
+            @Override
+            protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request,
+                    HttpServletResponse response) throws Exception {
+                        response.getWriter().write("<ul><li>A list</li></ul>");
+            }
+
+        });
+    }
+
+    @GetMapping("/partials/mav")
+    public HtmxResponse getFirstModelAndView() {
+        return new HtmxResponse().addTemplate(new ModelAndView("fragments :: todoItem", Map.of("item", new TodoItem("Foo"))));
+    }
+
     @GetMapping("/partials/main-and-partial")
     public HtmxResponse getMainAndPartial(Model model) {
         model.addAttribute("userCountOob", true);