/*
 * GNU Lesser General Public License
 *
 * Beanlet - JSE Application Container.
 * Copyright (C) 2006  Leon van Zantvoort
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
 * 
 * Leon van Zantvoort
 * 243 Acalanes Drive #11
 * Sunnyvale, CA 94086
 * USA
 *
 * zantvoort@users.sourceforge.net
 * http://beanlet.org
 */
package org.beanlet.web.impl;

import org.beanlet.BeanletStateException;
import org.beanlet.Inject;
import org.beanlet.annotation.Element;
import org.beanlet.annotation.ElementAnnotation;
import org.beanlet.common.AbstractDependencyInjectionFactory;
import org.beanlet.common.InjectantImpl;
import org.beanlet.plugin.BeanletConfiguration;
import org.beanlet.plugin.Injectant;
import org.beanlet.web.WebContext;
import org.jargo.ComponentContext;

import javax.servlet.ServletRequest;
import java.util.Collections;
import java.util.Set;

/**
 *
 * @author Leon van Zantvoort
 */
public final class WebContextDependencyInjectionFactoryImpl extends
        AbstractDependencyInjectionFactory<Inject> {

    private final BeanletConfiguration<?> configuration;

    public WebContextDependencyInjectionFactoryImpl(
            BeanletConfiguration<?> configuration) {
        super(configuration);
        this.configuration = configuration;
    }
    
    public Class<Inject> annotationType() {
        return Inject.class;
    }

    public boolean isSupported(ElementAnnotation<? extends Element, Inject> ea) {
        return WebContext.class.isAssignableFrom(getType(ea));
    }
    
    public boolean isOptional(ElementAnnotation<? extends Element, Inject> ea) {
        return ea.getAnnotation().optional();
    }
    
    public Set<String> getDependencies(
            ElementAnnotation<? extends Element, Inject> ea) {
        return Collections.emptySet();
    }

    public Injectant<?> getInjectant(
            final ElementAnnotation<? extends Element, Inject> ea, 
            final ComponentContext<?> ctx) {
        WebContext wx = new WebContext() {
            public ServletRequest getServletRequest() throws BeanletStateException {
                ServletRequest request = RequestContextListener.get();
                if (request == null) {
                    throw new BeanletStateException(
                            ctx.getComponentMetaData().getComponentName(), "No servlet request active.");
                }
                return request;
            }
        };
        return new InjectantImpl<Object>(wx, true);
    }
    
    @Override
    public Class<?> getType(Inject inject) {
        return inject.type();
    }
}