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Diffstat (limited to '')
-rw-r--r-- | sca-java-2.x/tags/2.0-Beta1-RC2/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/runtime/utils/ContextHelper.java | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0-Beta1-RC2/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-Beta1-RC2/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-Beta1-RC2/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); + } + } + +} |