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/*
* JBoss, Home of Professional Open Source
* Copyright 2010, 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.bean.attributes;
import java.lang.annotation.Annotation;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.util.HashSet;
import java.util.Set;
import javax.enterprise.context.Dependent;
import javax.enterprise.inject.spi.BeanAttributes;
import javax.enterprise.inject.spi.BeanManager;
import org.jboss.weld.logging.MetadataLogger;
/**
* Creates {@link BeanAttributes} based on BeanAttributes provided by an extension. This class handles creating a safe copy as
* well as basic validation of provided {@link BeanAttributes}.
*
* @author Jozef Hartinger
* @author Marko Luksa
*
*/
public class ExternalBeanAttributesFactory {
private ExternalBeanAttributesFactory() {
}
/**
* @param source source {@link BeanAttributes}.
* @return a safe copy of source {@link BeanAttributes}.
*/
public static BeanAttributes of(BeanAttributes source, BeanManager manager) {
validateBeanAttributes(source, manager);
BeanAttributes attributes = new ImmutableBeanAttributes(defensiveCopy(source.getStereotypes()), source.isAlternative(), source.getName(),
defensiveCopy(source.getQualifiers()), defensiveCopy(source.getTypes()), source.getScope());
return attributes;
}
private static Set defensiveCopy(Set set) {
return new HashSet(set);
}
/**
* Validates {@link BeanAttributes}.
* @param attributes {@link BeanAttributes} to validate
*/
public static void validateBeanAttributes(BeanAttributes attributes, BeanManager manager) {
validateStereotypes(attributes, manager);
validateQualifiers(attributes, manager);
validateTypes(attributes, manager);
validateScope(attributes, manager);
}
public static void validateStereotypes(BeanAttributes attributes, BeanManager manager) {
if(attributes.getStereotypes() == null) {
throw MetadataLogger.LOG.stereotypesNull(attributes);
}
for (Class annotation : attributes.getStereotypes()) {
if (!manager.isStereotype(annotation)) {
throw MetadataLogger.LOG.notAStereotype(annotation, attributes);
}
}
}
public static void validateQualifiers(BeanAttributes attributes, BeanManager manager) {
if(attributes.getQualifiers() == null) {
throw MetadataLogger.LOG.qualifiersNull(attributes);
}
for (Annotation annotation : attributes.getQualifiers()) {
if (!manager.isQualifier(annotation.annotationType())) {
throw MetadataLogger.LOG.notAQualifier(annotation.annotationType(), attributes);
}
}
}
public static void validateTypes(BeanAttributes attributes, BeanManager manager) {
if(attributes.getTypes() == null) {
throw MetadataLogger.LOG.typesNull(attributes);
}
if (attributes.getTypes().isEmpty()) {
throw MetadataLogger.LOG.typesEmpty(attributes);
}
for (Type type : attributes.getTypes()) {
validateBeanType(type, attributes);
}
}
private static void validateBeanType(Type type, BeanAttributes attributes) {
checkBeanTypeNotATypeVariable(type, type, attributes);
checkBeanTypeForWildcardsAndTypeVariables(type, type, attributes);
}
private static void checkBeanTypeNotATypeVariable(Type beanType, Type type, BeanAttributes attributes) {
if (type instanceof TypeVariable) {
throw MetadataLogger.LOG.typeVariableIsNotAValidBeanType(beanType, attributes);
} else if (type instanceof GenericArrayType) {
GenericArrayType arrayType = (GenericArrayType) type;
checkBeanTypeNotATypeVariable(beanType, arrayType.getGenericComponentType(), attributes);
}
}
private static void checkBeanTypeForWildcardsAndTypeVariables(Type beanType, Type type, BeanAttributes attributes) {
if (type instanceof TypeVariable) {
if (!attributes.getScope().equals(Dependent.class)) {
throw MetadataLogger.LOG.beanWithParameterizedTypeContainingTypeVariablesMustBeDependentScoped(beanType, attributes);
}
} else if (type instanceof WildcardType) {
throw MetadataLogger.LOG.parameterizedTypeContainingWildcardParameterIsNotAValidBeanType(beanType, attributes);
} else if (type instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) type;
for (Type typeArgument : parameterizedType.getActualTypeArguments()) {
checkBeanTypeForWildcardsAndTypeVariables(beanType, typeArgument, attributes);
}
} else if (type instanceof GenericArrayType) {
GenericArrayType arrayType = (GenericArrayType) type;
checkBeanTypeForWildcardsAndTypeVariables(beanType, arrayType.getGenericComponentType(), attributes);
}
}
public static void validateScope(BeanAttributes attributes, BeanManager manager) {
if(attributes.getScope() == null) {
throw MetadataLogger.LOG.scopeNull(attributes);
}
if (!manager.isScope(attributes.getScope())) {
throw MetadataLogger.LOG.notAScope(attributes.getScope(), attributes);
}
}
}
