1 files changed, 114 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/1.1/modules/contribution-impl/src/main/java/org/apache/tuscany/sca/contribution/resolver/impl/ResourceReferenceModelResolver.java b/sca-java-1.x/tags/1.1/modules/contribution-impl/src/main/java/org/apache/tuscany/sca/contribution/resolver/impl/ResourceReferenceModelResolver.java
new file mode 100644
index 0000000000..b5df1cde37
--- /dev/null
+++ b/sca-java-1.x/tags/1.1/modules/contribution-impl/src/main/java/org/apache/tuscany/sca/contribution/resolver/impl/ResourceReferenceModelResolver.java
@@ -0,0 +1,114 @@
+/*
+ * 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.resolver.impl;
+
+import java.lang.ref.WeakReference;
+import java.lang.reflect.Constructor;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ResourceReference;
+
+/**
+ * A Model Resolver for ResourceReferences.
+ *
+ */
+public class ResourceReferenceModelResolver implements ModelResolver {
+    private Contribution contribution;
+    protected WeakReference<ClassLoader> classLoader;
+    private Map<String, ResourceReference> map = new HashMap<String, ResourceReference>();
+
+    private ModelResolver osgiResolver;
+
+    public ResourceReferenceModelResolver(Contribution contribution, ModelFactoryExtensionPoint modelFactories) {
+        this.contribution = contribution;
+        this.classLoader = new WeakReference<ClassLoader>(this.contribution.getClassLoader());
+
+        try {
+            Class osgiResolverClass =
+                Class.forName("org.apache.tuscany.sca.contribution.osgi.impl.OSGiResourceReferenceModelResolver");
+            if (osgiResolverClass != null) {
+                Constructor constructor =
+                    osgiResolverClass.getConstructor(Contribution.class, ModelFactoryExtensionPoint.class);
+                this.osgiResolver = (ModelResolver)constructor.newInstance(contribution, modelFactories);
+            }
+        } catch (Exception e) {
+        }
+    }
+
+    public void addModel(Object resolved) {
+        ResourceReference resourceRef = (ResourceReference)resolved;
+        map.put(resourceRef.getResourceName(), resourceRef);
+    }
+
+    public Object removeModel(Object resolved) {
+        return map.remove(((ResourceReference)resolved).getResourceName());
+    }
+
+    public <T> T resolveModel(Class<T> modelClass, T unresolved) {
+        Object resolved = map.get(unresolved);
+
+        if (resolved != null) {
+            return modelClass.cast(resolved);
+        }
+
+        //Get a resource
+        String resourceName = ((ResourceReference)unresolved).getResourceName();
+        URL resourceURL = null;
+
+        if (URI.create(resourceName).isAbsolute()) {
+            try {
+                resourceURL = URI.create(resourceName).toURL();
+            } catch (MalformedURLException e) {
+                // Ignore
+            }
+        }
+
+        if (resourceURL == null && osgiResolver != null) {
+            // Try OSGi
+            resolved = osgiResolver.resolveModel(modelClass, unresolved);
+            resourceURL = ((ResourceReference)resolved).getResource();
+        }
+
+        if (resourceURL == null) {
+            // Try class loader
+            resourceURL = classLoader.get().getResource(resourceName);
+        }
+
+        if (resourceURL != null) {
+            // Store a new ResourceReference wrappering the resource
+            ResourceReference resourceReference = new ResourceReference(resourceName, resourceURL);
+            map.put(resourceName, resourceReference);
+
+            // Return the resolved ResourceReference
+            return modelClass.cast(resourceReference);
+        } else {
+            return unresolved;
+        }
+
+    }
+
+}