/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, 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.builtin.ee;

import static org.jboss.weld.util.reflection.Reflections.cast;

import java.lang.reflect.Field;
import java.security.AccessController;

import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.BeanAttributes;

import org.jboss.weld.annotated.enhanced.EnhancedAnnotatedField;
import org.jboss.weld.bean.AbstractClassBean;
import org.jboss.weld.bean.DisposalMethod;
import org.jboss.weld.bootstrap.api.ServiceRegistry;
import org.jboss.weld.exceptions.WeldException;
import org.jboss.weld.injection.FieldInjectionPoint;
import org.jboss.weld.injection.InjectionContextImpl;
import org.jboss.weld.injection.InjectionPointFactory;
import org.jboss.weld.injection.ResourceInjection;
import org.jboss.weld.injection.ResourceInjectionFactory;
import org.jboss.weld.manager.BeanManagerImpl;
import org.jboss.weld.security.GetAccessibleCopyOfMember;
import org.jboss.weld.util.reflection.Reflections;

/**
 * A resource producer field that is static (not injected).
 *
 * @author Jozef Hartinger
 *
 * @param <X>
 * @param <T>
 */
public class StaticEEResourceProducerField<X, T> extends EEResourceProducerField<X, T> {

    public static <X, T> StaticEEResourceProducerField<X, T> of(BeanAttributes<T> attributes,
            EnhancedAnnotatedField<T, ? super X> field, AbstractClassBean<X> declaringBean,
            DisposalMethod<X, ?> disposalMethod, BeanManagerImpl manager, ServiceRegistry services) {
        return new StaticEEResourceProducerField<X, T>(attributes, field, declaringBean, disposalMethod, manager, services);
    }

    private final ResourceInjection<T> resourceInjection;
    private final Field accessibleField;
    private final InjectionContextImpl<X> injectionContext; // injection context is shared since it does not use instance state

    protected StaticEEResourceProducerField(BeanAttributes<T> attributes, EnhancedAnnotatedField<T, ? super X> field,
            AbstractClassBean<X> declaringBean, DisposalMethod<X, ?> disposalMethod, BeanManagerImpl manager,
            ServiceRegistry services) {
        super(attributes, field, declaringBean, disposalMethod, manager, services);
        this.resourceInjection = getResourceInjection(field, declaringBean, manager);
        this.accessibleField = AccessController.doPrivileged(new GetAccessibleCopyOfMember<Field>(field.getJavaMember()));
        this.injectionContext = new InjectionContextImpl<X>(manager, declaringBean.getInjectionTarget(), declaringBean.getAnnotated(), null) {
            @Override
            public void proceed() {
            }
        };
    }

    protected ResourceInjection<T> getResourceInjection(EnhancedAnnotatedField<T, ? super X> field,
            AbstractClassBean<X> declaringBean, BeanManagerImpl manager) {
        FieldInjectionPoint<T, X> injectionPoint = cast(InjectionPointFactory.silentInstance().createFieldInjectionPoint(field, declaringBean, declaringBean.getBeanClass(), manager));
        return manager.getServices().get(ResourceInjectionFactory.class).getStaticProducerFieldResourceInjection(injectionPoint, beanManager);
    }

    @Override
    public T create(CreationalContext<T> creationalContext) {
        if (resourceInjection != null) {
            return resourceInjection.getResourceReference(creationalContext);
        } else {
            injectionContext.run();
            try {
                return Reflections.cast(accessibleField.get(null));
            } catch (IllegalAccessException e) {
                throw new WeldException(e);
            }
        }
    }
}