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package com.sun.faces.vendor;
import com.sun.faces.spi.InjectionProvider;
import com.sun.faces.spi.InjectionProviderException;
import com.sun.faces.util.FacesLogger;
import javax.annotation.PreDestroy;
import javax.annotation.PostConstruct;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;
import java.util.logging.Level;
/**
* <p>This <code>InjectionProvider</code> will be used if the
* <code>PostConstruct</code> and <code>PreDestroy</code> annotations
* are present, but no specific <code>InjectionProvider</code> has
* been configured.</p>.
*
* <p>It's important to note that this will not provide resource injection.</p>
*/
public class WebContainerInjectionProvider implements InjectionProvider {
private static final Logger LOGGER = FacesLogger.APPLICATION.getLogger();
// ------------------------------------------ Methods from InjectionProvider
@Override
public void inject(Object managedBean) throws InjectionProviderException {
// no-op
}
@Override
public void invokePreDestroy(Object managedBean)
throws InjectionProviderException {
if (managedBean != null) {
invokeAnnotatedMethod(getAnnotatedMethod(managedBean,
PreDestroy.class),
managedBean);
}
}
@Override
public void invokePostConstruct(Object managedBean)
throws InjectionProviderException {
if (managedBean != null) {
invokeAnnotatedMethod(getAnnotatedMethod(managedBean,
PostConstruct.class),
managedBean);
}
}
// --------------------------------------------------------- Private Methods
private static void invokeAnnotatedMethod(Method method, Object managedBean)
throws InjectionProviderException {
if (method != null) {
boolean accessible = method.isAccessible();
method.setAccessible(true);
try {
method.invoke(managedBean);
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
throw new InjectionProviderException(e.getMessage(), e);
} finally {
method.setAccessible(accessible);
}
}
}
private static class MethodHolder {
private final Method method;
public MethodHolder(Method method){
this.method = method;
}
public Method getMethod() {
return method;
}
}
private static ConcurrentHashMap<Class, ConcurrentHashMap<Class<? extends Annotation>, MethodHolder>> methodsPerClazz =
new ConcurrentHashMap<>();
private static Method getAnnotatedMethod(Object managedBean,
Class<? extends Annotation> annotation) {
Class<?> clazz = managedBean.getClass();
while (!Object.class.equals(clazz)) {
ConcurrentHashMap<Class<? extends Annotation>, MethodHolder> methodsMap = methodsPerClazz.get(clazz);
if(methodsMap==null) {
ConcurrentHashMap<Class<? extends Annotation>, MethodHolder> newMethodsMap =
new ConcurrentHashMap<>();
methodsMap = methodsPerClazz.putIfAbsent(clazz, newMethodsMap);
if(methodsMap==null) {
methodsMap = newMethodsMap;
}
}
MethodHolder methodHolder = methodsMap.get(annotation);
if(methodHolder==null) {
Method[] methods = clazz.getDeclaredMethods();
Method method = getAnnotatedMethodForMethodArr(methods, annotation);
MethodHolder newMethodHolder = new MethodHolder(method);
methodHolder = methodsMap.putIfAbsent(annotation, newMethodHolder);
if(methodHolder==null) {
methodHolder = newMethodHolder;
}
}
if(methodHolder.getMethod()!=null) {
return methodHolder.getMethod();
}
clazz = clazz.getSuperclass();
}
return null;
}
private static Method getAnnotatedMethodForMethodArr(Method[] methods, Class<? extends Annotation> annotation) {
for (Method method : methods) {
if (method.isAnnotationPresent(annotation)) {
// validate method
if (Modifier.isStatic(method.getModifiers())) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING,
"jsf.core.web.injection.method_not_static",
new Object[] { method.toString(),
annotation.getName() });
}
continue;
}
if (!Void.TYPE.equals(method.getReturnType())) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING,
"jsf.core.web.injection.method_return_not_void",
new Object[] { method.toString(),
annotation.getName() });
}
continue;
}
if (method.getParameterTypes().length != 0) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING,
"jsf.core.web.injection.method_no_params",
new Object[] { method.toString(),
annotation.getName() });
}
continue;
}
Class<?>[] exceptions = method.getExceptionTypes();
if (method.getExceptionTypes().length != 0) {
boolean hasChecked = false;
for (Class<?> excClass : exceptions) {
if (!RuntimeException.class.isAssignableFrom(excClass)) {
hasChecked = true;
break;
}
}
if (hasChecked) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING,
"jsf.core.web.injection.method_no_checked_exceptions",
new Object[]{method.toString(),
annotation.getName()});
}
continue;
}
}
// we found a match.
return method;
}
}
return null;
}
}