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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, 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.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import javax.enterprise.inject.spi.Bean;

import org.jboss.weld.bean.AbstractClassBean;
import org.jboss.weld.bean.ProducerMethod;
import org.jboss.weld.bootstrap.BeanDeployerEnvironment;
import org.jboss.weld.ejb.EjbDescriptors;
import org.jboss.weld.introspector.WeldClass;
import org.jboss.weld.introspector.WeldMethod;

/**
 * Keeps the BDA closure information.
 *
 * @author Ales Justin
 * @author Marko Luksa
 */
public final class BeansClosure {

    private final Map, Bean> specialized = new ConcurrentHashMap, Bean>();
    private final Map envs = new ConcurrentHashMap();

    public BeansClosure() {
    }

    // --- modification methods

    public void addSpecialized(Bean specializedBean, Bean specializingBean) {
        specialized.put(specializedBean, specializingBean);
    }

    public void addEnvironment(BeanDeployerEnvironment environment) {
        envs.put(environment, Object.class);
    }

    public void clear() {
        envs.clear();
    }

    public void destroy() {
        specialized.clear();
    }

    // -- querys

    @Deprecated // should not be used
    public Map getSpecialized() {
        return Collections.unmodifiableMap(specialized);
    }

    public Bean getSpecializingBean(Bean bean) {
        return specialized.get(bean);
    }

    public boolean isSpecialized(Bean bean) {
        return getSpecializingBean(bean) != null;
    }

    public Bean getMostSpecializingBean(Bean bean) {
        Bean most = bean;
        while (most != null) {
            Bean temp = most;
            most = getSpecializingBean(bean);
            bean = temp;
        }
        return bean;
    }

    public boolean isEJB(WeldClass clazz) {
        for (BeanDeployerEnvironment bde : getEnvironments()) {
            EjbDescriptors ed = bde.getEjbDescriptors();
            if (ed.contains(clazz.getJavaClass()))
                return true;
        }
        return false;
    }

    public Bean getClassBean(WeldClass clazz) {
        for (BeanDeployerEnvironment bde : getEnvironments()) {
            AbstractClassBean classBean = bde.getClassBean(clazz);
            if (classBean != null)
                return classBean;
        }
        return null;
    }

    public ProducerMethod getProducerMethod(WeldMethod superClassMethod) {
        for (BeanDeployerEnvironment bde : getEnvironments()) {
            ProducerMethod pm = bde.getProducerMethod(superClassMethod);
            if (pm != null)
                return pm;
        }
        return null;
    }

    private Set getEnvironments() {
        return envs.keySet();
    }
}