1 files changed, 130 insertions, 0 deletions
diff --git a/tags/java/sca/1.5.1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultModelFactoryExtensionPoint.java b/tags/java/sca/1.5.1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultModelFactoryExtensionPoint.java
new file mode 100644
index 0000000000..b69c58a0ff
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+++ b/tags/java/sca/1.5.1/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultModelFactoryExtensionPoint.java
@@ -0,0 +1,130 @@
+/*
+ * 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.contribution;
+
+import java.lang.reflect.Constructor;
+import java.util.HashMap;
+
+import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+
+
+/**
+ * Default implementation of a model factory extension point.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultModelFactoryExtensionPoint implements ModelFactoryExtensionPoint {
+    
+    private HashMap<Class<?>, Object> factories = new HashMap<Class<?>, Object>();
+    
+    /**
+     * Constructs a new DefaultModelFactoryExtensionPoint.
+     */
+    public DefaultModelFactoryExtensionPoint() {
+    }
+
+    /**
+     * Add a model factory extension.
+     * 
+     * @param factory The factory to add
+     */
+    public void addFactory(Object factory) {
+        Class<?>[] interfaces = factory.getClass().getInterfaces();
+        if (interfaces.length == 0) {
+            Class<?> sc = factory.getClass().getSuperclass();
+            if (sc != Object.class) {
+                factories.put(sc, factory);
+            }
+        } else {
+            for (int i = 0; i<interfaces.length; i++) {
+                factories.put(interfaces[i], factory);
+            }
+        }
+    }
+
+    /**
+     * Remove a model factory.
+     *  
+     * @param factory The factory to remove
+     */
+    public void removeFactory(Object factory) {
+        Class<?>[] interfaces = factory.getClass().getInterfaces();
+        if (interfaces.length == 0) {
+            Class<?> sc = factory.getClass().getSuperclass();
+            if (sc != Object.class) {
+                factories.remove(sc);
+            }
+        } else {
+            for (int i = 0; i<interfaces.length; i++) {
+                factories.remove(interfaces[i]);
+            }
+        }
+    }
+    
+    /**
+     * Get a factory implementing the given interface.
+     * @param factoryInterface The lookup key (factory interface)
+     * @return The factory
+     */    
+    public <T> T getFactory(Class<T> factoryInterface) {
+        Object factory = factories.get(factoryInterface);
+        if (factory == null) {
+            
+            if (factoryInterface.isInterface()) {
+                
+                // Dynamically load a factory class declared under META-INF/services 
+                try {
+                	Class<?> factoryClass = ServiceDiscovery.getInstance().loadFirstServiceClass(factoryInterface);
+                    if (factoryClass != null) {
+                    	
+                        try {
+                            // Default empty constructor
+                            Constructor<?> constructor = factoryClass.getConstructor();
+                            factory = constructor.newInstance();
+                        } catch (NoSuchMethodException e) {
+                            
+                            // Constructor taking the model factory extension point
+                            Constructor<?> constructor = factoryClass.getConstructor(ModelFactoryExtensionPoint.class);
+                            factory = constructor.newInstance(this);
+                        }
+                        
+                        // Cache the loaded factory
+                        addFactory(factory);
+                    }
+                } catch (Exception e) {
+                    throw new IllegalArgumentException(e);
+                }
+            } else {
+
+                // Call the newInstance static method on the factory abstract class
+                try {
+                    factory = ServiceDiscovery.getInstance().newFactoryClassInstance(factoryInterface);
+                } catch (Exception e) {
+                    throw new IllegalArgumentException(e);
+                }
+                
+                // Cache the factory
+                addFactory(factory);
+            }
+        }
+        return factoryInterface.cast(factory);
+    }
+
+}