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/*
* 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);
}
}
}
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