o Refactored model building listener to use problem collector

git-svn-id: https://svn.apache.org/repos/asf/maven/components/trunk@800418 13f79535-47bb-0310-9956-ffa450edef68

maven-core/src/main/java/org/apache/maven/project/DefaultModelBuildingListener.java

@@ -21,7 +21,9 @@ package org.apache.maven.project;
 
 import java.util.List;
 
+import org.apache.maven.artifact.InvalidRepositoryException;
 import org.apache.maven.artifact.repository.ArtifactRepository;
+import org.apache.maven.artifact.resolver.ArtifactResolutionException;
 import org.apache.maven.model.Model;
 import org.apache.maven.model.building.AbstractModelBuildingListener;
 import org.apache.maven.model.building.ModelBuildingEvent;
@@ -104,21 +106,41 @@ class DefaultModelBuildingListener
 
     @Override
     public void buildExtensionsAssembled( ModelBuildingEvent event )
-        throws Exception
     {
         Model model = event.getModel();
 
+        try
+        {
             remoteRepositories =
                 projectBuildingHelper.createArtifactRepositories( model.getRepositories(), remoteRepositories );
+        }
+        catch ( InvalidRepositoryException e )
+        {
+            event.getProblems().addError( "Invalid artifact repository: " + e.getMessage(), e );
+        }
 
+        try
+        {
             pluginRepositories =
                 projectBuildingHelper.createArtifactRepositories( model.getPluginRepositories(), pluginRepositories );
+        }
+        catch ( InvalidRepositoryException e )
+        {
+            event.getProblems().addError( "Invalid plugin repository: " + e.getMessage(), e );
+        }
 
         if ( event.getRequest().isProcessPlugins() )
+        {
+            try
             {
                 projectRealm =
                     projectBuildingHelper.createProjectRealm( model, projectBuildingRequest.getLocalRepository(),
                                                               pluginRepositories );
+            }
+            catch ( ArtifactResolutionException e )
+            {
+                event.getProblems().addError( "Unresolveable build extensions: " + e.getMessage(), e );
+            }
 
             if ( projectRealm != null )
             {

maven-model-builder/src/main/java/org/apache/maven/model/building/AbstractModelBuildingListener.java

@@ -29,7 +29,6 @@ public class AbstractModelBuildingListener
 {
 
     public void buildExtensionsAssembled( ModelBuildingEvent event )
-        throws Exception
     {
         // default does nothing
     }

maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuilder.java

@@ -718,19 +718,12 @@ public class DefaultModelBuilder
             return;
         }
 
-        ModelBuildingEvent event = new DefaultModelBuildingEvent( model, request );
+        ModelBuildingEvent event = new DefaultModelBuildingEvent( model, request, problems );
 
         for ( ModelBuildingListener listener : request.getModelBuildingListeners() )
-        {
-            try
         {
             listener.buildExtensionsAssembled( event );
         }
-            catch ( Exception e )
-            {
-                problems.addError( "Invalid build extensions: " + e.getMessage(), e );
-            }
-        }
     }
 
 }

maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuildingEvent.java

@@ -34,10 +34,13 @@ class DefaultModelBuildingEvent
 
     private final ModelBuildingRequest request;
 
-    public DefaultModelBuildingEvent( Model model, ModelBuildingRequest request )
+    private final ModelProblemCollector problems;
+
+    public DefaultModelBuildingEvent( Model model, ModelBuildingRequest request, ModelProblemCollector problems )
     {
         this.model = model;
         this.request = request;
+        this.problems = problems;
     }
 
     public Model getModel()
@@ -50,4 +53,9 @@ class DefaultModelBuildingEvent
         return request;
     }
 
+    public ModelProblemCollector getProblems()
+    {
+        return problems;
+    }
+
 }

maven-model-builder/src/main/java/org/apache/maven/model/building/ModelBuildingEvent.java

@@ -30,17 +30,24 @@ public interface ModelBuildingEvent
 {
 
     /**
-     * The model being built. The precise state of this model depends on the event being fired.
+     * Gets the model being built. The precise state of this model depends on the event being fired.
      * 
      * @return The model being built, never {@code null}.
      */
     Model getModel();
 
     /**
-     * The model building request being processed.
+     * Gets the model building request being processed.
      * 
      * @return The model building request being processed, never {@code null}.
      */
     ModelBuildingRequest getRequest();
 
+    /**
+     * Gets the container used to collect problems that were encountered while processing the event.
+     * 
+     * @return The container used to collect problems that were encountered, never {@code null}.
+     */
+    ModelProblemCollector getProblems();
+
 }

maven-model-builder/src/main/java/org/apache/maven/model/building/ModelBuildingListener.java

@@ -20,9 +20,8 @@ package org.apache.maven.model.building;
  */
 
 /**
- * Defines events that the model builder fires during construction of the effective model. Unless otherwise noted, an
+ * Defines events that the model builder fires during construction of the effective model. When a listener encounteres
- * exception thrown by the listener during processing of the event will be treated as a fatal error and aborts building
+ * errors while processing the event, it can report these problems via {@link ModelBuildingEvent#getProblems()}.
- * of the corresponding model.
  * 
  * @author Benjamin Bentmann
  */
@@ -33,9 +32,7 @@ public interface ModelBuildingListener
      * Notifies the listener that the model has been constructed to the extent where build extensions can be processed.
      * 
      * @param event The details about the event.
-     * @throws Exception If the listener encountered an error.
      */
-    void buildExtensionsAssembled( ModelBuildingEvent event )
+    void buildExtensionsAssembled( ModelBuildingEvent event );
-        throws Exception;
 
 }