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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, 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.ejb;

import com.google.common.base.Supplier;
import com.google.common.collect.Multimaps;
import com.google.common.collect.SetMultimap;
import org.jboss.weld.bootstrap.api.Service;
import org.jboss.weld.ejb.spi.EjbDescriptor;
import org.jboss.weld.exceptions.IllegalStateException;

import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import static org.jboss.weld.logging.messages.BeanMessage.TOO_MANY_EJBS_FOR_CLASS;
import static org.jboss.weld.util.reflection.Reflections.cast;

/**
 * EJB descriptors by EJB implementation class or name
 *
 * @author Pete Muir
 */
public class EjbDescriptors implements Service, Iterable> {
    // EJB name -> EJB descriptors map
    private final Map> ejbByName;

    private final SetMultimap, String> ejbByClass;

    public static final EjbDescriptors EMPTY = new EjbDescriptors();

    /**
     * Constructor
     */
    public EjbDescriptors() {
        this.ejbByName = new HashMap>();
        this.ejbByClass = Multimaps.newSetMultimap(new HashMap, Collection>(), new Supplier>() {

            public Set get() {
                return new HashSet();
            }

        });
    }

    /**
     * Gets an iterator to the EJB descriptors for an EJB implementation class
     *
     * @param beanClass The EJB class
     * @return An iterator
     */
    public  InternalEjbDescriptor get(String beanName) {
        return cast(ejbByName.get(beanName));
    }

    /**
     * Adds an EJB descriptor to the maps
     *
     * @param ejbDescriptor The EJB descriptor to add
     */
    public  void add(EjbDescriptor ejbDescriptor) {
        InternalEjbDescriptor internalEjbDescriptor = new InternalEjbDescriptor(ejbDescriptor);
        ejbByName.put(ejbDescriptor.getEjbName(), internalEjbDescriptor);
        ejbByClass.put(ejbDescriptor.getBeanClass(), internalEjbDescriptor.getEjbName());
    }

    /**
     * Indicates if there are EJB descriptors available for an EJB implementation
     * class
     *
     * @param beanClass The class to match
     * @return True if present, otherwise false
     */
    public boolean contains(String beanName) {
        return ejbByName.containsKey(beanName);
    }

    /**
     * Indicates if there are EJB descriptors available for an EJB implementation
     * class
     *
     * @param beanClass The class to match
     * @return True if present, otherwise false
     */
    public boolean contains(Class beanClass) {
        return ejbByClass.containsKey(beanClass);
    }

    public InternalEjbDescriptor getUnique(Class beanClass) {
        Set ejbs = ejbByClass.get(beanClass);
        if (ejbs.size() > 1) {
            throw new IllegalStateException(TOO_MANY_EJBS_FOR_CLASS, beanClass, ejbs);
        } else if (ejbs.size() == 0) {
            return null;
        } else {
            return get(ejbs.iterator().next());
        }
    }

    /**
     * Adds all EJB descriptors to the maps
     *
     * @param ejbDescriptors The descriptors to add
     */
    public void addAll(Iterable> ejbDescriptors) {
        for (EjbDescriptor ejbDescriptor : ejbDescriptors) {
            add(ejbDescriptor);
        }
    }

    /**
     * Clears both maps
     */
    public void clear() {
        ejbByName.clear();
    }

    public Iterator> iterator() {
        return ejbByName.values().iterator();
    }

    public void cleanup() {
        this.ejbByClass.clear();
        this.ejbByName.clear();
    }

}