1 files changed, 123 insertions, 0 deletions
diff --git a/tags/java/sca/2.0-M3-RC3a/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/impl/CompositeCloneBuilderImpl.java b/tags/java/sca/2.0-M3-RC3a/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/impl/CompositeCloneBuilderImpl.java
new file mode 100644
index 0000000000..21e5192ae8
--- /dev/null
+++ b/tags/java/sca/2.0-M3-RC3a/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/impl/CompositeCloneBuilderImpl.java
@@ -0,0 +1,123 @@
+/*
+ * 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.    
+ */
+
+package org.apache.tuscany.sca.assembly.builder.impl;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.Implementation;
+import org.apache.tuscany.sca.assembly.builder.CompositeBuilder;
+import org.apache.tuscany.sca.assembly.builder.CompositeBuilderException;
+import org.apache.tuscany.sca.definitions.Definitions;
+import org.apache.tuscany.sca.monitor.Monitor;
+
+/**
+ * A composite builder that clones nested composites.
+ *
+ * @version $Rev$ $Date$
+ */
+public class CompositeCloneBuilderImpl implements CompositeBuilder {
+    
+    public CompositeCloneBuilderImpl() {
+    }
+    
+    public void build(Composite composite, Definitions definitions, Monitor monitor) throws CompositeBuilderException {
+        expandCompositeImplementations(composite);
+    }
+
+    public String getID() {
+        return "org.apache.tuscany.sca.assembly.builder.CompositeCloneBuilder";
+    }
+
+    /**
+     * Expand composite component implementations.
+     * 
+     * @param composite
+     * @param problems
+     */
+    private void expandCompositeImplementations(Composite composite) {
+        for (Component component : composite.getComponents()) {
+            Implementation implementation = component.getImplementation();
+            if (implementation instanceof Composite) {
+    
+                Composite compositeImplementation = (Composite)implementation;
+                Composite clone;
+                try {
+                    clone = (Composite)compositeImplementation.clone();
+                } catch (CloneNotSupportedException e) {
+                    throw new RuntimeException(e);
+                }
+                component.setImplementation(clone);
+                expandCompositeImplementations(clone);
+            }
+        }
+    }
+
+    /**
+     * Collect all nested composite implementations in a graph of composites.
+     * 
+     * @param composite
+     * @param nested
+     */
+    private void collectNestedComposites(Composite composite, List<Composite> nested) {
+        for (Component component : composite.getComponents()) {
+            Implementation implementation = component.getImplementation();
+            if (implementation instanceof Composite) {
+                Composite nestedComposite = (Composite)implementation;
+                nested.add(nestedComposite);
+                collectNestedComposites(nestedComposite, nested);
+            }
+        }
+    }
+
+    /**
+     * Fuse nested composites into a top level composite.
+     * 
+     * @param composite
+     */
+    private void fuseCompositeImplementations(Composite composite) {
+    
+        // First collect all nested composites
+        List<Composite> nested = new ArrayList<Composite>();
+        collectNestedComposites(composite, nested);
+    
+        // Then add all the non-composite components they contain 
+        for (Composite nestedComposite : nested) {
+            for (Component component: nestedComposite.getComponents()) {
+                Implementation implementation = component.getImplementation();
+                if (!(implementation instanceof Composite)) {
+                    composite.getComponents().add(component);
+                }
+            }
+        }
+    
+        // Clear the initial list of composite components
+        for (Iterator<Component> i = composite.getComponents().iterator(); i.hasNext();) {
+            Component component = i.next();
+            if (component.getImplementation() instanceof Composite) {
+                i.remove();
+            }
+        }
+    }
+
+}