1 files changed, 135 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/definitions/xml/DefaultDefinitionsExtensionPoint.java b/sca-java-2.x/tags/2.0.1-RC1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/definitions/xml/DefaultDefinitionsExtensionPoint.java
new file mode 100644
index 0000000000..dfbc2e2cbf
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/assembly-xml/src/main/java/org/apache/tuscany/sca/definitions/xml/DefaultDefinitionsExtensionPoint.java
@@ -0,0 +1,135 @@
+/*
+ * 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.definitions.xml;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessorExtensionPoint;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.UtilityExtensionPoint;
+import org.apache.tuscany.sca.definitions.Definitions;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+import org.apache.tuscany.sca.monitor.MonitorFactory;
+
+/**
+ * Default implementation of an extension point for XML definitionss.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultDefinitionsExtensionPoint implements DefinitionsExtensionPoint {
+    private static final Logger logger = Logger.getLogger(DefaultDefinitionsExtensionPoint.class.getName());
+    private static final URI DEFINITIONS_URI = URI.create("META-INF/definitions.xml");
+    private ExtensionPointRegistry registry;
+    private MonitorFactory monitorFactory;
+    private Set<URL> documents = new HashSet<URL>();
+    private List<Definitions> definitions = new ArrayList<Definitions>();
+    private boolean documentsLoaded;
+    private boolean loaded;
+
+    public DefaultDefinitionsExtensionPoint(ExtensionPointRegistry registry) {
+        this.registry = registry;
+        this.monitorFactory = registry.getExtensionPoint(UtilityExtensionPoint.class).getUtility(MonitorFactory.class);
+    }
+
+    public void addDefinitionsDocument(URL url) {
+        documents.add(url);
+    }
+
+    public void removeDefinitionsDocument(URL url) {
+        documents.remove(url);
+    }
+
+    /**
+     * Load definitions declarations from META-INF/services/
+     * org.apache.tuscany.sca.contribution.processor.Definitions files
+     */
+    private synchronized void loadDefinitionsDocuments() {
+        if (documentsLoaded)
+            return;
+
+        // Get the definitions declarations
+        Collection<ServiceDeclaration> definitionsDeclarations;
+        try {
+            // Get definitions declarations in ranking order.
+            definitionsDeclarations = registry.getServiceDiscovery().getServiceDeclarations(DEFINITIONS_FILE, true);
+        } catch (IOException e) {
+            throw new IllegalStateException(e);
+        }
+
+        // Find each definitions
+        Set<String> definitionResources = new HashSet<String>();
+        for (ServiceDeclaration definitionsDeclaration : definitionsDeclarations) {
+            // Only process the first instance of a given resource name.
+            // This allows definitions files to be overridden by an embedder. 
+            String resourceName = definitionsDeclaration.getClassName();
+            if (!definitionResources.contains(resourceName)) {
+                definitionResources.add(resourceName);
+                URL url = definitionsDeclaration.getResource(resourceName);
+                if (url == null) {
+                    throw new IllegalArgumentException(definitionsDeclaration.getClassName() + " cannot be found");
+                }
+                documents.add(url);
+            }
+        }
+
+        documentsLoaded = true;
+    }
+
+    public synchronized List<Definitions> getDefinitions() {
+        if (!loaded) {
+            loadDefinitionsDocuments();
+            URLArtifactProcessorExtensionPoint processors =
+                registry.getExtensionPoint(URLArtifactProcessorExtensionPoint.class);
+            URLArtifactProcessor<Definitions> processor = processors.getProcessor(Definitions.class);
+            ProcessorContext context = new ProcessorContext(monitorFactory.createMonitor());
+            for (URL url : documents) {
+                Definitions def;
+                try {
+                    def = processor.read(null, DEFINITIONS_URI, url, context);
+                    definitions.add(def);
+                } catch (ContributionReadException e) {
+                    logger.log(Level.SEVERE, e.getMessage(), e);
+                }
+            }
+            loaded = true;
+        }
+        return definitions;
+    }
+
+    public void addDefinitions(Definitions def) {
+        this.definitions.add(def);
+    }
+
+    public void removeDefinitions(Definitions def) {
+        this.definitions.remove(def);
+    }
+}