/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.activemq.web;

import java.util.Iterator;
import java.util.Set;

import javax.management.ObjectName;
import javax.management.QueryExp;

import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.jmx.BrokerView;
import org.apache.activemq.broker.jmx.BrokerViewMBean;
import org.apache.activemq.broker.jmx.ManagedRegionBroker;
import org.apache.activemq.broker.jmx.ManagementContext;
import org.apache.activemq.broker.region.Destination;
import org.apache.activemq.broker.region.DestinationFilter;
import org.apache.activemq.broker.region.Queue;
import org.apache.activemq.command.ActiveMQDestination;

/**
 * An implementation of {@link BrokerFacade} which uses a local in JVM broker
 */
public class LocalBrokerFacade extends BrokerFacadeSupport {

    private final BrokerService brokerService;

    public LocalBrokerFacade(BrokerService brokerService) {
        this.brokerService = brokerService;
    }

    public BrokerService getBrokerService() {
        return brokerService;
    }

    @Override
    public String getBrokerName() throws Exception {
        return brokerService.getBrokerName();
    }

    public Broker getBroker() throws Exception {
        return brokerService.getBroker();
    }

    @Override
    public ManagementContext getManagementContext() {
        return brokerService.getManagementContext();
    }

    @Override
    public BrokerViewMBean getBrokerAdmin() throws Exception {
        return brokerService.getAdminView();
    }

    public ManagedRegionBroker getManagedBroker() throws Exception {
        BrokerView adminView = brokerService.getAdminView();
        if (adminView == null) {
            return null;
        }
        return adminView.getBroker();
    }

    @Override
    public void purgeQueue(ActiveMQDestination destination) throws Exception {
        Set<Destination> destinations = getManagedBroker().getQueueRegion().getDestinations(destination);
        for (Iterator<Destination> i = destinations.iterator(); i.hasNext();) {
            Destination dest = unwrap(i.next());
            if (dest instanceof Queue) {
                Queue regionQueue = (Queue) dest;
                regionQueue.purge();
            }
        }
    }


    private Destination unwrap(Destination dest) {
        if (dest instanceof DestinationFilter) {
            return unwrap(((DestinationFilter) dest).getNext());
        }
        return dest;
    }

    @Override
    public Set queryNames(ObjectName name, QueryExp query) throws Exception {
        return getManagementContext().queryNames(name, query);
    }

    @Override
    public Object newProxyInstance(ObjectName objectName, Class interfaceClass, boolean notificationBroadcaster) {
        return getManagementContext().newProxyInstance(objectName, interfaceClass, notificationBroadcaster);
    }
}
