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From schu...@apache.org
Subject maven-aether git commit: Feature: Addition of JavaDependencyMediator. Blocks MNG-5988.
Date Fri, 01 Jul 2016 17:24:30 GMT
Repository: maven-aether
Updated Branches:
  refs/heads/master 1ee92862c -> 1b4370b1a


Feature: Addition of JavaDependencyMediator. Blocks MNG-5988.


Project: http://git-wip-us.apache.org/repos/asf/maven-aether/repo
Commit: http://git-wip-us.apache.org/repos/asf/maven-aether/commit/1b4370b1
Tree: http://git-wip-us.apache.org/repos/asf/maven-aether/tree/1b4370b1
Diff: http://git-wip-us.apache.org/repos/asf/maven-aether/diff/1b4370b1

Branch: refs/heads/master
Commit: 1b4370b1a4e82ce5dfaaea133b40a7fce801fc52
Parents: 1ee9286
Author: Christian Schulte <schulte@apache.org>
Authored: Fri Jul 1 16:35:43 2016 +0200
Committer: Christian Schulte <schulte@apache.org>
Committed: Fri Jul 1 18:18:00 2016 +0200

----------------------------------------------------------------------
 .../transformer/JavaDependencyMediator.java     | 124 +++++++++++++++++++
 1 file changed, 124 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/maven-aether/blob/1b4370b1/aether-util/src/main/java/org/eclipse/aether/util/graph/transformer/JavaDependencyMediator.java
----------------------------------------------------------------------
diff --git a/aether-util/src/main/java/org/eclipse/aether/util/graph/transformer/JavaDependencyMediator.java
b/aether-util/src/main/java/org/eclipse/aether/util/graph/transformer/JavaDependencyMediator.java
new file mode 100644
index 0000000..ae385e6
--- /dev/null
+++ b/aether-util/src/main/java/org/eclipse/aether/util/graph/transformer/JavaDependencyMediator.java
@@ -0,0 +1,124 @@
+package org.eclipse.aether.util.graph.transformer;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+import java.util.Iterator;
+
+import org.eclipse.aether.RepositoryException;
+import org.eclipse.aether.collection.DependencyGraphTransformationContext;
+import org.eclipse.aether.collection.DependencyGraphTransformer;
+import org.eclipse.aether.graph.DependencyNode;
+import org.eclipse.aether.util.artifact.JavaScopes;
+
+/**
+ * A {@code DependencyGraphTransformer} applying the Maven dependency mediation mechanism.
+ *
+ * @author Christian Schulte
+ * @since 1.2
+ * @see <a href="http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#Dependency_Scope">Introduction
to the Dependency Mechanism</a>
+ */
+public final class JavaDependencyMediator
+    implements DependencyGraphTransformer
+{
+
+    @Override
+    public DependencyNode transformGraph( final DependencyNode node,
+                                          final DependencyGraphTransformationContext context
)
+        throws RepositoryException
+    {
+        return this.recurse( node );
+    }
+
+    private DependencyNode recurse( final DependencyNode parent )
+    {
+        final String parentScope = parent.getDependency() != null
+                                       ? parent.getDependency().getScope() != null
+                                             && parent.getDependency().getScope().length()
>= 0
+                                             ? parent.getDependency().getScope()
+                                             : JavaScopes.COMPILE
+                                       : null;
+
+        for ( final Iterator<DependencyNode> it = parent.getChildren().iterator();
it.hasNext(); )
+        {
+            final DependencyNode child = it.next();
+            boolean removed = false;
+
+            if ( parentScope != null )
+            {
+                String childScope = child.getDependency().getScope() != null
+                                        && child.getDependency().getScope().length()
>= 0
+                                        ? child.getDependency().getScope()
+                                        : JavaScopes.COMPILE;
+
+                if ( ( child.getManagedBits() & DependencyNode.MANAGED_SCOPE ) == 0 )
+                {
+                    // Non-managed child scopes are updated according to the table in the
"Dependency Scope" section
+                    // of the "Introduction to the Dependency Mechanism" document.
+
+                    if ( JavaScopes.PROVIDED.equals( parentScope ) )
+                    {
+                        // Compile and runtime become provided.
+                        if ( JavaScopes.COMPILE.equals( childScope )
+                                 || JavaScopes.RUNTIME.equals( childScope ) )
+                        {
+                            childScope = JavaScopes.PROVIDED;
+                            child.getDependency().setScope( childScope );
+                        }
+                    }
+                    else if ( JavaScopes.RUNTIME.equals( parentScope ) )
+                    {
+                        // Compile becomes runtime.
+                        if ( JavaScopes.COMPILE.equals( childScope ) )
+                        {
+                            childScope = JavaScopes.RUNTIME;
+                            child.getDependency().setScope( childScope );
+                        }
+                    }
+                    else if ( JavaScopes.TEST.equals( parentScope ) )
+                    {
+                        // Compile and runtime become test.
+                        if ( JavaScopes.COMPILE.equals( childScope )
+                                 || JavaScopes.RUNTIME.equals( childScope ) )
+                        {
+                            childScope = JavaScopes.TEST;
+                            child.getDependency().setScope( childScope );
+                        }
+                    }
+                }
+
+                // Provided and test scopes are non-transitive.
+                if ( JavaScopes.PROVIDED.equals( childScope )
+                         || JavaScopes.TEST.equals( childScope ) )
+                {
+                    it.remove();
+                    removed = true;
+                }
+            }
+
+            if ( !removed )
+            {
+                this.recurse( child );
+            }
+        }
+
+        return parent;
+    }
+
+}


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