1 files changed, 124 insertions, 0 deletions
diff --git a/sandbox/slaws/modules/domain-rework/src/main/java/org/apache/tuscany/sca/binding/DefaultBindingURICalculatorExtensionPoint.java b/sandbox/slaws/modules/domain-rework/src/main/java/org/apache/tuscany/sca/binding/DefaultBindingURICalculatorExtensionPoint.java
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index 0000000000..ae8b33a006
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+++ b/sandbox/slaws/modules/domain-rework/src/main/java/org/apache/tuscany/sca/binding/DefaultBindingURICalculatorExtensionPoint.java
@@ -0,0 +1,124 @@
+/*
+ * 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.binding;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.contribution.service.ContributionException;
+import org.apache.tuscany.sca.contribution.service.ContributionReadException;
+import org.apache.tuscany.sca.contribution.util.ServiceDeclaration;
+import org.apache.tuscany.sca.contribution.util.ServiceDiscovery;
+
+/**
+ * Default implementation of a binding URI calculator extension point.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DefaultBindingURICalculatorExtensionPoint implements BindingURICalculatorExtensionPoint {
+
+    private Map<String, BindingURICalculator> bindingURICalculators = new HashMap<String, BindingURICalculator>();
+    private boolean loaded;
+
+    public DefaultBindingURICalculatorExtensionPoint() {
+    }
+
+    public void addBindingURICalculator(BindingURICalculator bindingURICalculator) {
+        bindingURICalculators.put(bindingURICalculator.getBindingType(), bindingURICalculator);
+    }
+
+    public void removeBindingURICalculator(BindingURICalculator bindingURICalculator) {
+        bindingURICalculators.remove(bindingURICalculator.getBindingType());
+    }
+
+    public BindingURICalculator getBindingURICalculator(Binding binding) {
+        loadbindingURICalculators();
+        return bindingURICalculators.get(binding.getClass().getName());
+    }
+
+    private void loadbindingURICalculators() {
+        if (loaded)
+            return;
+
+        // Get the bindingURICalculator service declarations
+        Set<ServiceDeclaration> bindingURICalculatorDeclarations; 
+        try {
+            bindingURICalculatorDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(BindingURICalculator.class);
+        } catch (IOException e) {
+            throw new IllegalStateException(e);
+        }
+        
+        for (ServiceDeclaration bindingURICalculatorDeclaration: bindingURICalculatorDeclarations) {
+            Map<String, String> attributes = bindingURICalculatorDeclaration.getAttributes();
+            
+            // Load a URL artifact bindingURICalculator
+            String bindingType = attributes.get("binding");
+            
+            // Create a bindingURICalculator wrapper and register it
+            BindingURICalculator bindingURICalculator = new LazyBindingURICalculator(bindingType, bindingURICalculatorDeclaration);
+            addBindingURICalculator(bindingURICalculator);
+        }
+        
+        loaded = true;
+    }
+
+    /**
+     * A facade for contribution bindingURICalculators.
+     */
+    private static class LazyBindingURICalculator implements BindingURICalculator {
+        
+        private ServiceDeclaration bindingURICalculatorDeclaration;
+        private String bindingType;
+        private BindingURICalculator bindingURICalculator;
+        
+        private LazyBindingURICalculator(String contributionType, ServiceDeclaration bindingURICalculatorDeclaration) {
+            this.bindingURICalculatorDeclaration = bindingURICalculatorDeclaration;
+            this.bindingType = contributionType;
+        }
+
+        public String getBindingType() {
+            return bindingType;
+        }
+        
+        public String getProtocol(Binding binding) {
+            return getbindingURICalculator().getProtocol(binding);
+        }
+        
+        private BindingURICalculator getbindingURICalculator() {
+            if (bindingURICalculator == null) {
+                try {
+                    Class<BindingURICalculator> bindingURICalculatorClass = (Class<BindingURICalculator>)bindingURICalculatorDeclaration.loadClass();
+                    Constructor<BindingURICalculator> constructor = bindingURICalculatorClass.getConstructor();
+                    bindingURICalculator = constructor.newInstance();
+                } catch (Exception e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+            return bindingURICalculator;
+        }
+    }
+}