/*
 *
 * Copyright (c) 2006 The Apache Software Foundation
 *
 * 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.
 *
 */
#include "qpid/broker/ExchangeRegistry.h"
#include "qpid/broker/DirectExchange.h"
#include "qpid/broker/FanOutExchange.h"
#include "qpid/broker/HeadersExchange.h"
#include "qpid/broker/TopicExchange.h"

using namespace qpid::broker;
using namespace qpid::sys;
using std::pair;

pair<Exchange::shared_ptr, bool> ExchangeRegistry::declare(const string& name, const string& type) throw(UnknownExchangeTypeException){
    Mutex::ScopedLock locker(lock);
    ExchangeMap::iterator i =  exchanges.find(name);
    if (i == exchanges.end()) {
	Exchange::shared_ptr exchange;

        if(type == TopicExchange::typeName){
            exchange = Exchange::shared_ptr(new TopicExchange(name));
        }else if(type == DirectExchange::typeName){
            exchange = Exchange::shared_ptr(new DirectExchange(name));
        }else if(type == FanOutExchange::typeName){
            exchange = Exchange::shared_ptr(new FanOutExchange(name));
        }else if (type == HeadersExchange::typeName) {
            exchange = Exchange::shared_ptr(new HeadersExchange(name));
        }else{
            throw UnknownExchangeTypeException();    
        }
	exchanges[name] = exchange;
	return std::pair<Exchange::shared_ptr, bool>(exchange, true);
    } else {
	return std::pair<Exchange::shared_ptr, bool>(i->second, false);
    }
}

void ExchangeRegistry::destroy(const string& name){
    Mutex::ScopedLock locker(lock);
    exchanges.erase(name);
}

Exchange::shared_ptr ExchangeRegistry::get(const string& name){
    Mutex::ScopedLock locker(lock);
    return exchanges[name];
}

namespace 
{
const std::string empty;
}

Exchange::shared_ptr ExchangeRegistry::getDefault()
{
    return get(empty);
}