Add start of a helper class to simplify using the implementation.web ComponentContext

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@748046 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 45 insertions, 0 deletions

diff --git a/java/sca/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/utils/ContextHelper.java b/java/sca/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/utils/ContextHelper.java
new file mode 100644
index 0000000000..9d904a0986
--- /dev/null
+++ b/java/sca/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/utils/ContextHelper.java
@@ -0,0 +1,45 @@
+/*

+ * 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.implementation.web.runtime.utils;

+

+import javax.servlet.ServletContext;

+

+import org.apache.tuscany.sca.runtime.RuntimeComponent;

+import org.oasisopen.sca.ComponentContext;

+import org.oasisopen.sca.ServiceReference;

+import org.oasisopen.sca.ServiceRuntimeException;

+

+public class ContextHelper {

+    

+    public static final String COMPONENT_ATTR = "org.apache.tuscany.sca.implementation.web.RuntimeComponent";

+    

+    public static ComponentContext getComponentContext(ServletContext sc) {

+        RuntimeComponent rc = (RuntimeComponent)sc.getAttribute(COMPONENT_ATTR);

+        return rc.getComponentContext();

+    }

+

+    public static <T> T getReference(String name, Class<T> type, ServletContext sc) {

+        ServiceReference<T> sr = getComponentContext(sc).getServiceReference(type, name);

+        if (sr == null) {

+            throw new ServiceRuntimeException("Reference '" + name + "' undefined");

+        }

+        return sr.getService();

+    }

+}