catch integration

docs/reference/src/main/docbook/en-US/introduction.xml

@@ -6,8 +6,8 @@
    <para>
       The goal of the Seam Servlet module is to provide portable enhancements to the Servlet API. Features include
       producers for implicit Servlet objects and HTTP request state, propagating Servlet events to the CDI event bus,
-      forwarding uncaught exceptions to the Seam Catch handler chain (planned) and binding the BeanManager to a Servlet
-      context attribute for convenient access.
+      forwarding uncaught exceptions to the Seam Catch handler chain and binding the BeanManager to a Servlet context
+      attribute for convenient access.
    </para>
 
 <!--

impl/pom.xml

@@ -45,6 +45,20 @@
          <scope>compile</scope>
       </dependency>
 
+      <dependency>
+         <groupId>org.jboss.seam.catch</groupId>
+         <artifactId>seam-catch-api</artifactId>
+         <version>3.0.0.Alpha1</version>
+         <scope>compile</scope>
+         <exclusions>
+            <!-- workaround for seam catch marking this compile scope -->
+            <exclusion>
+               <groupId>javax.enterprise</groupId>
+               <artifactId>cdi-api</artifactId>
+            </exclusion>
+         </exclusions>
+      </dependency>
+
       <dependency>
          <groupId>org.jboss.logging</groupId>
          <artifactId>jboss-logging</artifactId>

impl/src/main/java/org/jboss/seam/servlet/filter/CatchExceptionFilter.java

@@ -0,0 +1,75 @@
+/*
+ * JBoss, Home of Professional Open Source
+ * Copyright 2010, Red Hat Middleware LLC, and individual contributors
+ * by the @authors tag. See the copyright.txt in the distribution for a
+ * full listing of individual contributors.
+ *
+ * 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.jboss.seam.servlet.filter;
+
+import java.io.IOException;
+
+import javax.enterprise.event.Event;
+import javax.inject.Inject;
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+
+import org.jboss.seam.exception.control.ExceptionToCatchEvent;
+import org.jboss.seam.servlet.http.literal.HttpRequestLiteral;
+
+/**
+ * A bridge that forwards unhandled exceptions to the Seam exception handling facility (Seam Catch).
+ *
+ * @author <a href="http://community.jboss.org/people/dan.j.allen">Dan Allen</a>
+ */
+public class CatchExceptionFilter implements Filter
+{
+   @Inject
+   private Event<ExceptionToCatchEvent> bridgeEvent;
+
+   public void init(FilterConfig config) throws ServletException
+   {
+   }
+
+   public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
+   {
+      try
+      {
+         chain.doFilter(request, response);
+      }
+      catch (Exception e)
+      {
+         ExceptionToCatchEvent catchEvent = new ExceptionToCatchEvent(e, HttpRequestLiteral.INSTANCE);
+         bridgeEvent.fire(catchEvent);
+         // QUESTION shouldn't catch handle rethrowing?
+         if (!catchEvent.isHandled())
+         {
+            if (e instanceof ServletException)
+            {
+               throw (ServletException) e;
+            }
+            else if (e instanceof IOException)
+            {
+               throw (IOException) e;
+            }
+         }
+      }
+   }
+
+   public void destroy()
+   {
+   }
+}

readme.md

@@ -4,7 +4,7 @@ Provides portable and convenient enhancements to the Servlet API. Features inclu
 
 + producers for implicit Servlet objects and HTTP request state
 + propogation of Servlet events to the CDI event bus (Servlet event bridge)
-+ forwarding uncaught exceptions to the Seam exception handling infrastructure (Seam Catch integration) (planned)
++ forwarding uncaught exceptions to the Seam exception handling infrastructure (Seam Catch integration)
 + binding the BeanManager to a Servlet context attribute
 + and more...