1 files changed, 133 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/utils/ContextHelper.java b/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/utils/ContextHelper.java
new file mode 100644
index 0000000000..423e906d6b
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/utils/ContextHelper.java
@@ -0,0 +1,133 @@
+/*
+ * 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 java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+import javax.servlet.ServletContext;
+
+import org.apache.tuscany.sca.assembly.ComponentProperty;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+import org.oasisopen.sca.ComponentContext;
+import org.oasisopen.sca.ServiceReference;
+import org.oasisopen.sca.ServiceRuntimeException;
+import org.oasisopen.sca.annotation.ComponentName;
+import org.oasisopen.sca.annotation.Context;
+import org.oasisopen.sca.annotation.Property;
+import org.oasisopen.sca.annotation.Reference;
+
+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();
+    }
+
+    public static Object getProperty(String name, ServletContext sc) {
+        RuntimeComponent rc = (RuntimeComponent)sc.getAttribute(COMPONENT_ATTR);
+        for (ComponentProperty p : rc.getProperties()) {
+            if (name.equals(p.getName())) {
+                return p.getValue();
+            }
+        }
+        return null;
+    }
+
+    public static void inject(Object instance, ServletContext sc) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
+
+        Class<?> clazz = instance.getClass();
+        for (Field field : clazz.getDeclaredFields()) {
+            if (field.isAnnotationPresent(Reference.class)) {
+                Reference ref = field.getAnnotation(Reference.class);
+                String name = ref.name() != null && !ref.name().equals("") ? ref.name() : field.getName();
+                Object value = getReference(name, field.getType(), sc);
+                setField(instance, field, value);
+            } else if (field.isAnnotationPresent(Property.class)) {
+                Property prop = field.getAnnotation(Property.class);
+                String name = prop.name() != null && !prop.name().equals("") ? prop.name() : field.getName();
+                Object value = getProperty(name, sc);
+                setField(instance, field, value);
+            } else if (field.isAnnotationPresent(ComponentName.class)) {
+                RuntimeComponent rc = (RuntimeComponent)sc.getAttribute(COMPONENT_ATTR);
+                setField(instance, field, rc.getName());
+            } else if (field.isAnnotationPresent(Context.class)) {
+                setField(instance, field, getComponentContext(sc));
+            }
+        }
+
+        for (Method method : clazz.getDeclaredMethods()) {
+            if (!method.getName().startsWith("set") || method.getParameterTypes().length != 1) {
+                continue;
+            }
+            String targetName = method.getName().substring(3);
+            Class<?> type = method.getParameterTypes()[0];
+
+            if (method.isAnnotationPresent(Reference.class)) {
+                Reference ref = method.getAnnotation(Reference.class);
+                String name = ref.name() != null && !ref.name().equals("") ? ref.name() : targetName;
+                Object value = getReference(name, type, sc);
+                setMethod(instance, method, value);
+            } else if (method.isAnnotationPresent(Property.class)) {
+                Property prop = method.getAnnotation(Property.class);
+                String name = prop.name() != null && !prop.name().equals("") ? prop.name() : targetName;
+                Object value = getProperty(name, sc);
+                setMethod(instance, method, value);
+            } else if (method.isAnnotationPresent(ComponentName.class)) {
+                RuntimeComponent rc = (RuntimeComponent)sc.getAttribute(COMPONENT_ATTR);
+                setMethod(instance, method, rc.getName());
+            } else if (method.isAnnotationPresent(Context.class)) {
+                setMethod(instance, method, getComponentContext(sc));
+            }
+        }
+    }
+
+    private static void setMethod(Object instance, Method method, Object value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
+        if (method.isAccessible()) {
+            method.invoke(instance, new Object[] {value});
+        } else {
+            method.setAccessible(true);
+            method.invoke(instance, new Object[] {value});
+            method.setAccessible(false);
+        }
+    }
+
+    private static void setField(Object instance, Field field, Object value) throws IllegalArgumentException, IllegalAccessException {
+        if (field.isAccessible()) {
+            field.set(instance, value);
+        } else {
+            field.setAccessible(true);
+            field.set(instance, value);
+            field.setAccessible(false);
+        }
+    }
+
+}