1 files changed, 123 insertions, 0 deletions
diff --git a/sandbox/ant/container.python/src/main/java/org/apache/tuscany/container/python/PythonImplementationLoader.java b/sandbox/ant/container.python/src/main/java/org/apache/tuscany/container/python/PythonImplementationLoader.java
new file mode 100644
index 0000000000..61a6cbd4b6
--- /dev/null
+++ b/sandbox/ant/container.python/src/main/java/org/apache/tuscany/container/python/PythonImplementationLoader.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.container.python;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.net.URL;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+
+import org.apache.tuscany.spi.annotation.Autowire;
+import org.apache.tuscany.spi.component.CompositeComponent;
+import org.apache.tuscany.spi.deployer.DeploymentContext;
+import org.apache.tuscany.spi.extension.LoaderExtension;
+import org.apache.tuscany.spi.loader.LoaderException;
+import org.apache.tuscany.spi.loader.LoaderRegistry;
+import org.apache.tuscany.spi.loader.LoaderUtil;
+import org.apache.tuscany.spi.loader.MissingResourceException;
+import org.osoa.sca.annotations.Constructor;
+
+/**
+ * Loader for handling python elements.
+ * 
+ * <py:implementation.python module="path/foo.py" class="myclass">
+ *  
+ */
+public class PythonImplementationLoader extends LoaderExtension<PythonImplementation> {
+
+    private static final QName IMPLEMENTATION_PYTHON = new QName("http://tuscany.apache.org/xmlns/python/1.0", "implementation.python");
+
+    @Constructor( { "registry" })
+    public PythonImplementationLoader(@Autowire LoaderRegistry registry) {
+        super(registry);
+    }
+
+    public QName getXMLType() {
+        return IMPLEMENTATION_PYTHON;
+    }
+
+    public PythonImplementation load(CompositeComponent parent, XMLStreamReader reader, DeploymentContext deploymentContext)
+            throws XMLStreamException, LoaderException {
+
+        String moduleName = reader.getAttributeValue(null, "module");
+        if (moduleName == null) {
+            throw new MissingResourceException("implementation element has no module attribute");
+        }
+
+        String className = reader.getAttributeValue(null, "class");
+
+        LoaderUtil.skipToEndElement(reader);
+
+        PythonImplementation implementation = new PythonImplementation();
+
+        ClassLoader cl = deploymentContext.getClassLoader();
+        String pythonSource = loadSource(cl, moduleName);
+
+        PythonScript pythonScript = new PythonScript(moduleName, className, pythonSource, cl);
+        implementation.setPythonScript(pythonScript);
+        
+        registry.loadComponentType(parent, implementation, deploymentContext);
+
+        Class iface = implementation.getComponentType().getServices().values().iterator().next().getServiceContract().getInterfaceClass();
+        // TODO:  service interfaces should be on PythonScript constructor but loadComponentType requires the script name to work out the sidefile name
+        pythonScript.setServiceInterface(iface);
+
+        return implementation;
+    }
+
+    protected String loadSource(ClassLoader cl, String resource) throws LoaderException {
+        URL url = cl.getResource(resource);
+        if (url == null) {
+            throw new MissingResourceException(resource);
+        }
+        InputStream is;
+        try {
+            is = url.openStream();
+        } catch (IOException e) {
+            MissingResourceException mre = new MissingResourceException(resource, e);
+            mre.setIdentifier(resource);
+            throw mre;
+        }
+        try {
+            Reader reader = new InputStreamReader(is, "UTF-8");
+            char[] buffer = new char[1024];
+            StringBuilder source = new StringBuilder();
+            int count;
+            while ((count = reader.read(buffer)) > 0) {
+                source.append(buffer, 0, count);
+            }
+            return source.toString();
+        } catch (IOException e) {
+            LoaderException le = new LoaderException(e);
+            le.setIdentifier(resource);
+            throw le;
+        } finally {
+            try {
+                is.close();
+            } catch (IOException e) {
+                // ignore
+            }
+        }
+    }
+}