/*
 *
 * 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.qpid.server.model.adapter;

import java.security.AccessControlException;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.Set;

import org.apache.qpid.server.model.AbstractConfiguredObject;
import org.apache.qpid.server.model.Broker;
import org.apache.qpid.server.model.ConfiguredObject;
import org.apache.qpid.server.model.Plugin;
import org.apache.qpid.server.model.State;
import org.apache.qpid.server.security.access.Operation;

public abstract class AbstractPluginAdapter<X extends Plugin<X>> extends AbstractConfiguredObject<X> implements Plugin<X>
{
    private Broker _broker;
    private State _state = State.UNINITIALIZED;

    protected AbstractPluginAdapter(Map<String, Object> attributes, Broker broker)
    {
        super(parentsMap(broker), attributes);
        _broker = broker;
    }


    @Override
    public void onValidate()
    {
        super.onValidate();
        if(!isDurable())
        {
            throw new IllegalArgumentException(getClass().getSimpleName() + " must be durable");
        }
    }

    @Override
    protected void validateChange(final ConfiguredObject<?> proxyForValidation, final Set<String> changedAttributes)
    {
        super.validateChange(proxyForValidation, changedAttributes);
        if(changedAttributes.contains(DURABLE) && !proxyForValidation.isDurable())
        {
            throw new IllegalArgumentException(getClass().getSimpleName() + " must be durable");
        }
    }

    @Override
    public State getState()
    {
        return _state;
    }

    protected void setCurrentState(State state)
    {
        _state = state;
    }

    @Override
    public <C extends ConfiguredObject> Collection<C> getChildren(Class<C> clazz)
    {
        return Collections.emptyList();
    }

    @Override
    public Object getAttribute(String name)
    {
        if (STATE.equals(name))
        {
            return getState();
        }
        return super.getAttribute(name);
    }

    @Override
    protected void authoriseSetDesiredState(State desiredState) throws AccessControlException
    {
        if(desiredState == State.DELETED)
        {
            if (!_broker.getSecurityManager().authoriseConfiguringBroker(getName(), Plugin.class, Operation.DELETE))
            {
                throw new AccessControlException("Deletion of plugin is denied");
            }
        }
    }

    @Override
    protected void authoriseSetAttributes(ConfiguredObject<?> modified, Set<String> attributes) throws AccessControlException
    {
        if (!_broker.getSecurityManager().authoriseConfiguringBroker(getName(), Plugin.class, Operation.UPDATE))
        {
            throw new AccessControlException("Setting of plugin attributes is denied");
        }
    }

    protected Broker<?> getBroker()
    {
        return _broker;
    }
}
