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/*
* JBoss, Home of Professional Open Source
* Copyright 2008, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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.jboss.weld.util;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
import javax.enterprise.inject.spi.Bean;
import org.jboss.weld.Container;
import org.jboss.weld.bean.RIBean;
import org.jboss.weld.exceptions.IllegalArgumentException;
import org.jboss.weld.exceptions.UnproxyableResolutionException;
import org.jboss.weld.util.reflection.Reflections;
import org.jboss.weld.util.reflection.SecureReflections;
import org.jboss.weld.util.reflection.instantiation.InstantiatorFactory;
import static org.jboss.weld.logging.messages.UtilMessage.CANNOT_PROXY_NON_CLASS_TYPE;
import static org.jboss.weld.logging.messages.ValidatorMessage.NOT_PROXYABLE_ARRAY_TYPE;
import static org.jboss.weld.logging.messages.ValidatorMessage.NOT_PROXYABLE_FINAL_TYPE_OR_METHOD;
import static org.jboss.weld.logging.messages.ValidatorMessage.NOT_PROXYABLE_NO_CONSTRUCTOR;
import static org.jboss.weld.logging.messages.ValidatorMessage.NOT_PROXYABLE_PRIMITIVE;
import static org.jboss.weld.logging.messages.ValidatorMessage.NOT_PROXYABLE_PRIVATE_CONSTRUCTOR;
import static org.jboss.weld.logging.messages.ValidatorMessage.NOT_PROXYABLE_UNKNOWN;
/**
* Utilties for working with Javassist proxies
*
* @author Nicklas Karlsson
* @author Pete Muir
* @author Tomaz Cerar
* @author Ales Justin
*/
@SuppressWarnings({"ThrowableResultOfMethodCallIgnored", "NullableProblems"})
public class Proxies {
public static class TypeInfo {
private final Set> interfaces;
private final Set> classes;
private TypeInfo() {
super();
this.interfaces = new LinkedHashSet>();
this.classes = new LinkedHashSet>();
}
public Class getSuperClass() {
if (classes.isEmpty()) {
return Object.class;
}
Iterator> it = classes.iterator();
Class superclass = it.next();
while (it.hasNext()) {
Class clazz = it.next();
if (superclass.isAssignableFrom(clazz)) {
superclass = clazz;
}
}
return superclass;
}
public Class getSuperInterface() {
if (interfaces.isEmpty()) {
return null;
}
Iterator> it = interfaces.iterator();
Class superclass = it.next();
while (it.hasNext()) {
Class clazz = it.next();
if (superclass.isAssignableFrom(clazz)) {
superclass = clazz;
}
}
return superclass;
}
private TypeInfo add(Type type) {
if (type instanceof Class) {
Class clazz = (Class) type;
if (clazz.isInterface()) {
interfaces.add(clazz);
} else {
classes.add(clazz);
}
} else if (type instanceof ParameterizedType) {
add(((ParameterizedType) type).getRawType());
} else {
throw new IllegalArgumentException(CANNOT_PROXY_NON_CLASS_TYPE, type);
}
return this;
}
public Set> getClasses() {
return Collections.unmodifiableSet(classes);
}
public Set> getInterfaces() {
return Collections.unmodifiableSet(interfaces);
}
public static TypeInfo of(Set types) {
TypeInfo typeInfo = new TypeInfo();
for (Type type : types) {
typeInfo.add(type);
}
return typeInfo;
}
}
/**
* Indicates if a class is proxyable
*
* @param type The class to test
* @return True if proxyable, false otherwise
*/
public static boolean isTypeProxyable(Type type) {
return getUnproxyableTypeException(type) == null;
}
public static UnproxyableResolutionException getUnproxyableTypeException(Type type) {
return getUnproxyableTypeException(type, null);
}
/**
* Indicates if a set of types are all proxyable
*
* @param declaringBean with types to test
* @return True if proxyable, false otherwise
*/
public static boolean isTypesProxyable(Bean declaringBean) {
return getUnproxyableTypesException(declaringBean) == null;
}
public static UnproxyableResolutionException getUnproxyableTypesException(Bean declaringBean) {
if (declaringBean == null) {
throw new java.lang.IllegalArgumentException("Null declaring bean!");
}
if (declaringBean instanceof RIBean) {
RIBean riBean = (RIBean) declaringBean;
UnproxyableResolutionException constructorException = getUnproxyableClassException(riBean.getType(), declaringBean, true);
if (constructorException != null) {
return constructorException;
}
}
return getUnproxyableTypesExceptionInt(declaringBean.getTypes(), declaringBean);
}
public static UnproxyableResolutionException getUnproxyableTypesException(Iterable types) {
return getUnproxyableTypesExceptionInt(types, null);
}
// --- private
private static UnproxyableResolutionException getUnproxyableTypeException(Type type, Bean declaringBean) {
if (type instanceof Class) {
return getUnproxyableClassException((Class) type, declaringBean);
} else if (type instanceof ParameterizedType) {
Type rawType = ((ParameterizedType) type).getRawType();
if (rawType instanceof Class) {
return getUnproxyableClassException((Class) rawType, declaringBean);
}
}
return new UnproxyableResolutionException(NOT_PROXYABLE_UNKNOWN, type, getDeclaringBeanInfo(declaringBean));
}
private static UnproxyableResolutionException getUnproxyableTypesExceptionInt(Iterable types, Bean declaringBean) {
for (Type apiType : types) {
if (Object.class.equals(apiType)) {
continue;
}
UnproxyableResolutionException e = getUnproxyableTypeException(apiType, declaringBean);
if (e != null) {
return e;
}
}
return null;
}
private static UnproxyableResolutionException getUnproxyableClassException(Class clazz, Bean declaringBean) {
return getUnproxyableClassException(clazz, declaringBean, !(declaringBean instanceof RIBean));
}
private static UnproxyableResolutionException getUnproxyableClassException(Class clazz, Bean declaringBean, boolean strict) {
if (clazz.isInterface()) {
return null;
}
if (strict) {
UnproxyableResolutionException constructorException = checkConstructor(clazz, declaringBean);
if (constructorException != null) {
return constructorException;
}
}
if (Reflections.isTypeOrAnyMethodFinal(clazz)) {
return new UnproxyableResolutionException(NOT_PROXYABLE_FINAL_TYPE_OR_METHOD, clazz, Reflections.getNonPrivateFinalMethodOrType(clazz), getDeclaringBeanInfo(declaringBean));
} else if (clazz.isPrimitive()) {
return new UnproxyableResolutionException(NOT_PROXYABLE_PRIMITIVE, clazz, getDeclaringBeanInfo(declaringBean));
} else if (Reflections.isArrayType(clazz)) {
return new UnproxyableResolutionException(NOT_PROXYABLE_ARRAY_TYPE, clazz, getDeclaringBeanInfo(declaringBean));
} else {
return null;
}
}
private static UnproxyableResolutionException checkConstructor(Class clazz, Bean declaringBean) {
Constructor constructor;
try {
constructor = SecureReflections.getDeclaredConstructor(clazz);
} catch (NoSuchMethodException e) {
InstantiatorFactory factory = Container.instance().services().get(InstantiatorFactory.class);
if (factory == null || factory.useInstantiators() == false) {
return new UnproxyableResolutionException(NOT_PROXYABLE_NO_CONSTRUCTOR, clazz, getDeclaringBeanInfo(declaringBean));
} else {
return null;
}
}
if (constructor == null) {
return new UnproxyableResolutionException(NOT_PROXYABLE_NO_CONSTRUCTOR, clazz, getDeclaringBeanInfo(declaringBean));
} else if (Modifier.isPrivate(constructor.getModifiers())) {
InstantiatorFactory factory = Container.instance().services().get(InstantiatorFactory.class);
if (factory == null || factory.useInstantiators() == false) {
return new UnproxyableResolutionException(NOT_PROXYABLE_PRIVATE_CONSTRUCTOR, clazz, constructor, getDeclaringBeanInfo(declaringBean));
} else {
return null;
}
}
return null;
}
private static Object getDeclaringBeanInfo(Bean bean) {
return (bean != null) ? bean : "";
}
}