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Bridje Inversion of Control API
/*
* Copyright 2015 Bridje Framework.
*
* Licensed 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.bridje.ioc.impl;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.PostConstruct;
import org.bridje.ioc.ContextListener;
import org.bridje.ioc.Inject;
import org.bridje.ioc.IocContext;
import org.bridje.ioc.InjectNext;
class Instanciator
{
private static final Logger LOG = Logger.getLogger(Instanciator.class.getName());
private final IocContext context;
private final ServiceMap serviceMap;
private ContextListener[] contextListeners;
public Instanciator(IocContext context, ServiceMap serviceMap)
{
this.context = context;
this.serviceMap = serviceMap;
}
@SuppressWarnings("UseSpecificCatch")
public T instantiate(Class cls)
{
try
{
Constructor constructor = findDefaultConstructor(cls);
if(constructor == null)
{
return null;
}
constructor.setAccessible(true);
return (T)constructor.newInstance();
}
catch (InstantiationException | IllegalArgumentException | InvocationTargetException | IllegalAccessException ex)
{
LOG.warning(ex.getMessage());
}
return null;
}
public void callPostConstruct(Class cls, Object obj)
{
Class currentClass = cls;
while(!currentClass.equals(Object.class))
{
Method[] declaredMethods = currentClass.getDeclaredMethods();
for (Method declaredMethod : declaredMethods)
{
PostConstruct annotation = declaredMethod.getAnnotation(PostConstruct.class);
if(annotation != null)
{
try
{
declaredMethod.setAccessible(true);
declaredMethod.invoke(obj);
}
catch(SecurityException | IllegalAccessException | IllegalArgumentException | InvocationTargetException ex)
{
LOG.log(Level.SEVERE, ex.getMessage(), ex);
}
}
}
currentClass = currentClass.getSuperclass();
}
}
public void injectDependencies(Class cls, Object obj)
{
Field[] declaredFields = cls.getDeclaredFields();
for (Field declaredField : declaredFields)
{
Inject annotation = declaredField.getAnnotation(Inject.class);
if(annotation != null)
{
injectDependency(cls, obj, declaredField, null);
}
InjectNext annotationNext = declaredField.getAnnotation(InjectNext.class);
if(annotationNext != null)
{
injectDependency(cls, obj, declaredField, ClassUtils.findPriority(cls));
}
}
Class supClass = cls.getSuperclass();
if(supClass != null && supClass != Object.class)
{
injectDependencies(supClass, obj);
}
}
public void injectDependency(Class cls, Object obj, Field field, Integer priority)
{
try
{
Type service = field.getGenericType();
Object componentObj;
if(priority == null)
{
componentObj = context.findGeneric(service);
}
else
{
componentObj = context.findNextGeneric(service, priority);
}
field.setAccessible(true);
field.set(obj, componentObj);
}
catch(IllegalArgumentException | IllegalAccessException ex)
{
LOG.log(Level.SEVERE, ex.getMessage(), ex);
}
}
private Constructor findDefaultConstructor(Class cls)
{
for (Constructor constructor : cls.getDeclaredConstructors())
{
if (constructor.getParameterTypes().length == 0)
{
return constructor;
}
}
return null;
}
private void initContextListeners()
{
if(null == contextListeners)
{
contextListeners = context.findAll(ContextListener.class);
}
}
protected void invokePreCreateListener(Class cls)
{
if(ContextListener.class.isAssignableFrom(cls))
{
return;
}
initContextListeners();
if(null != contextListeners)
{
for (ContextListener contextListener : contextListeners)
{
//find the generic parameter type of ContextListener,
//example ContexListener -> type = java.lang.Integer
Type type = findGenericType(contextListener.getClass());
if(type.equals(Object.class))
{
contextListener.preCreateComponent(cls);
}
else
{
List services = serviceMap.getServices(cls);
if(services != null)
{
for (Type service : services)
{
if(type.equals(service))
{
contextListener.preCreateComponent(cls);
break;
}
}
}
}
}
}
}
public void invokePreInitListener(Class cls, Object instance)
{
if(ContextListener.class.isAssignableFrom(cls))
{
return;
}
initContextListeners();
if(null != contextListeners)
{
for (ContextListener contextListener : contextListeners)
{
//find the generic parameter type of ContextListener,
//example ContexListener -> type = java.lang.Integer
Type type = findGenericType(contextListener.getClass());
if(type.equals(Object.class))
{
contextListener.preInitComponent(cls, instance);
}
else
{
List services = serviceMap.getServices(cls);
if(services != null)
{
for (Type service : services)
{
if(type.equals(service))
{
contextListener.preInitComponent(cls, instance);
break;
}
}
}
}
}
}
}
public void invokePostInitListener(Class cls, Object instance)
{
if(ContextListener.class.isAssignableFrom(cls))
{
return;
}
initContextListeners();
if(null != contextListeners)
{
for (ContextListener contextListener : contextListeners)
{
//find the generic parameter type of ContextListener,
//example ContexListener -> type = java.lang.Integer
Type type = findGenericType(contextListener.getClass());
if(type.equals(Object.class))
{
contextListener.postInitComponent(cls, instance);
}
else
{
List services = serviceMap.getServices(cls);
if(services != null)
{
for (Type service : services)
{
if(type.equals(service))
{
contextListener.postInitComponent(cls, instance);
break;
}
}
}
}
}
}
}
private Type findGenericType(Class clazz)
{
Type[] ifcs = clazz.getGenericInterfaces();
for (Type ifc : ifcs)
{
if(ifc instanceof ParameterizedType
&& ClassUtils.rawClass(ifc).equals(ContextListener.class))
{
return (((ParameterizedType)ifc).getActualTypeArguments())[0];
}
}
return Object.class;
}
}