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/*
* Copyright 2013 eXo Platform SAS
*
* 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 juzu.impl.inject;
import juzu.Scope;
import juzu.impl.common.Tools;
import juzu.impl.inject.spi.Injector;
import javax.inject.Provider;
import javax.inject.Qualifier;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
/**
* Describes a bean registered in an IOC container.
*
* The {@link #declaredType} type is the mandatory type exposed by the bean. The {@link #implementationType} type can be
* optionally provided to specify the implementation type of the bean. When the implementation type implements the
* {@link javax.inject.Provider} interface, the implementation....
*
* @author Julien Viet
*/
public abstract class BeanDescriptor {
/** The bean declared type. */
private final Class declaredType;
/** The bean scope. */
private final Scope scope;
/** The bean qualifiers. */
private final List qualifiers;
/** The bean implementation type. */
private final Class implementationType;
private BeanDescriptor(
Class declaredType,
Scope scope,
List qualifiers,
Class implementationType) throws NullPointerException, IllegalArgumentException {
if (declaredType == null) {
throw new NullPointerException("No null declared type accepted");
}
if (qualifiers != null) {
for (Annotation qualifier : qualifiers) {
if (qualifier.annotationType().getAnnotation(Qualifier.class) == null) {
throw new IllegalArgumentException("Qualifier annotation " + qualifier + " is not annotated with @Qualifier");
}
}
}
//
this.declaredType = declaredType;
this.scope = scope;
this.qualifiers = qualifiers;
this.implementationType = implementationType;
}
public static BeanDescriptor createFromProviderType(
final Class declaredType,
Scope scope,
List qualifiers,
final Class> implementationType) throws NullPointerException, IllegalArgumentException {
return new BeanDescriptor(declaredType, scope, qualifiers, implementationType) {
@Override
public void bind(Injector builder) {
// Bind provider
builder.declareProvider(
declaredType,
getScope(),
getQualifiers(),
implementationType);
}
};
}
public static BeanDescriptor createFromProvider(
final Class declaredType,
Scope scope,
List qualifiers,
final Provider implementationType) throws NullPointerException, IllegalArgumentException {
return new BeanDescriptor(declaredType, scope, qualifiers, null) {
@Override
public void bind(Injector builder) {
// Bind provider
builder.bindProvider(
declaredType,
getScope(),
getQualifiers(),
implementationType);
}
};
}
public static BeanDescriptor createFromImpl(
final Class declaredType,
Scope scope,
List qualifiers,
final Class implementationType) throws NullPointerException, IllegalArgumentException {
return new BeanDescriptor(declaredType, scope, qualifiers, implementationType) {
@Override
public void bind(Injector builder) {
// Bean implementation declaration
builder.declareBean(
declaredType,
getScope(),
getQualifiers(),
implementationType);
}
};
}
public static BeanDescriptor createFromBean(
final Class declaredType,
Scope scope,
List qualifiers) throws NullPointerException, IllegalArgumentException {
// Direct declaration
return new BeanDescriptor(declaredType, scope, qualifiers, null) {
@Override
public void bind(Injector builder) {
builder.declareBean(declaredType, getScope(), getQualifiers(), null);
}
};
}
public Class getDeclaredType() {
return declaredType;
}
public Scope getScope() {
return scope;
}
public List getQualifiers() {
return qualifiers;
}
public Class getImplementationType() {
return implementationType;
}
public abstract void bind(Injector builder);
/**
* Utils method that happens the qualifiers provided by the {@link javax.inject.Provider} get method to the list
* of existing qualifiers
*
* @param qualifiers the original qualifiers
* @param providerClass the provided class
* @return the annotations
*/
public static Iterable appendProvidedQualifiers(Iterable qualifiers, Class providerClass) {
try {
Method getMethod = providerClass.getMethod("get");
Annotation[] annotations = getMethod.getAnnotations();
return appendQualifiers(qualifiers, annotations);
}
catch (NoSuchMethodException e) {
// ?
return qualifiers;
}
}
/**
* Utils method that happens the qualifiers of the bean class to the list
* of existing qualifiers
*
* @param qualifiers the original qualifiers
* @param beanClass the bean class
* @return the annotations
*/
public static Iterable appendQualifiers(Iterable qualifiers, Class beanClass) {
return appendQualifiers(qualifiers, beanClass.getAnnotations());
}
/**
* Utils method that happens the qualifiers of the bean class to the list
* of existing qualifiers
*
* @param qualifiers the original qualifiers
* @param annotations the the annotations
* @return the annotations
*/
private static Iterable appendQualifiers(Iterable qualifiers, Annotation[] annotations) {
List next = null;
for (Annotation annotation : annotations) {
if (annotation.annotationType().isAnnotationPresent(Qualifier.class)) {
if (next == null) {
next = new ArrayList();
if (qualifiers != null) {
Tools.addAll(next, qualifiers);
}
}
next.add(annotation);
}
}
return next != null ? next : qualifiers;
}
}
