o Extended repo system to grab artifacts without resolving them

git-svn-id: https://svn.apache.org/repos/asf/maven/components/trunk@800086 13f79535-47bb-0310-9956-ffa450edef68

maven-compat/src/main/java/org/apache/maven/artifact/resolver/ArtifactResolver.java

@@ -35,6 +35,8 @@ import org.apache.maven.wagon.events.TransferListener;
 // Just hide the one method we want behind the RepositorySystem interface.
 public interface ArtifactResolver
 {
+    ArtifactResolutionResult collect( ArtifactResolutionRequest request );
+
     ArtifactResolutionResult resolve( ArtifactResolutionRequest request );
 
     // The rest is deprecated

maven-compat/src/main/java/org/apache/maven/artifact/resolver/DefaultArtifactResolver.java

@@ -339,8 +339,18 @@ public class DefaultArtifactResolver
     // ------------------------------------------------------------------------
     //
     // ------------------------------------------------------------------------
-    
+
+    public ArtifactResolutionResult collect( ArtifactResolutionRequest request )
+    {
+        return resolve( request, true );
+    }
+
     public ArtifactResolutionResult resolve( ArtifactResolutionRequest request )
+    {
+        return resolve( request, false );
+    }
+
+    private ArtifactResolutionResult resolve( ArtifactResolutionRequest request, boolean collectOnly )
     {
         Artifact rootArtifact = request.getArtifact();
         Set<Artifact> artifacts = request.getArtifactDependencies();
@@ -382,7 +392,7 @@ public class DefaultArtifactResolver
         // file reference. But this may be a Maven Plugin that we need to resolve from a remote repository
         // as well as its dependencies.
                         
-        if ( request.isResolveRoot() /* && rootArtifact.getFile() == null */ )
+        if ( !collectOnly && request.isResolveRoot() /* && rootArtifact.getFile() == null */ )
         {            
             try
             {
@@ -457,7 +467,7 @@ public class DefaultArtifactResolver
             return result;
         }
                 
-        if ( result.getArtifacts() != null )
+        if ( !collectOnly && result.getArtifacts() != null )
         {
             for ( Artifact artifact : result.getArtifacts() )
             {

maven-compat/src/main/java/org/apache/maven/repository/LegacyRepositorySystem.java

@@ -260,6 +260,57 @@ public class LegacyRepositorySystem
         return url;
     }
 
+    public ArtifactResolutionResult collect( ArtifactResolutionRequest request )
+    {
+        /*
+         * Probably is not worth it, but here I make sure I restore request
+         * to its original state. 
+         */
+        try
+        {
+            LocalArtifactRepository ideWorkspace = plexus.lookup( LocalArtifactRepository.class, LocalArtifactRepository.IDE_WORKSPACE );
+
+            if ( request.getLocalRepository() instanceof DelegatingLocalArtifactRepository )
+            {
+                DelegatingLocalArtifactRepository delegatingLocalRepository = (DelegatingLocalArtifactRepository) request.getLocalRepository();
+
+                LocalArtifactRepository orig = delegatingLocalRepository.getIdeWorspace();
+
+                delegatingLocalRepository.setIdeWorkspace( ideWorkspace );
+
+                try
+                {
+                    return artifactResolver.collect( request );
+                }
+                finally
+                {
+                    delegatingLocalRepository.setIdeWorkspace( orig );
+                }
+            }
+            else
+            {
+                ArtifactRepository localRepository = request.getLocalRepository();
+                DelegatingLocalArtifactRepository delegatingLocalRepository = new DelegatingLocalArtifactRepository( localRepository );
+                delegatingLocalRepository.setIdeWorkspace( ideWorkspace );
+                request.setLocalRepository( delegatingLocalRepository );
+                try
+                {
+                    return artifactResolver.collect( request );
+                }
+                finally
+                {
+                    request.setLocalRepository( localRepository );
+                }
+            }
+        }
+        catch ( ComponentLookupException e )
+        {
+            // no ide workspace artifact resolution
+        }
+
+        return artifactResolver.resolve( request );
+    }
+
     public ArtifactResolutionResult resolve( ArtifactResolutionRequest request )
     {
         /*

maven-compat/src/main/java/org/apache/maven/repository/RepositorySystem.java

@@ -90,6 +90,8 @@ public interface RepositorySystem
      */
     List<ArtifactRepository> getEffectiveRepositories( List<ArtifactRepository> repositories );    
 
+    ArtifactResolutionResult collect( ArtifactResolutionRequest request );
+
     ArtifactResolutionResult resolve( ArtifactResolutionRequest request );
 
     MetadataResolutionResult resolveMetadata( MetadataResolutionRequest request );