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/*
*
* 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.
*
*/
using System;
using System.Collections;
using Apache.Qpid.Framing;
using Apache.Qpid.Messaging;
namespace Apache.Qpid.Client.Message
{
public class MessageFactoryRegistry
{
private readonly Hashtable _mimeToFactoryMap = new Hashtable();
private IMessageFactory _defaultFactory;
/// <summary>
/// Default factory to use for unknown message types
/// </summary>
public IMessageFactory DefaultFactory
{
get { return _defaultFactory; }
set { _defaultFactory = value; }
}
/// <summary>
/// Register a new message factory for a MIME type
/// </summary>
/// <param name="mimeType">Mime type to register</param>
/// <param name="mf"></param>
public void RegisterFactory(string mimeType, IMessageFactory mf)
{
if ( mf == null )
throw new ArgumentNullException("mf");
if ( mimeType == null || mimeType.Length == 0 )
throw new ArgumentNullException("mimeType");
_mimeToFactoryMap[mimeType] = mf;
}
/// <summary>
/// Remove a message factory
/// </summary>
/// <param name="mimeType">MIME type to unregister</param>
public void DeregisterFactory(string mimeType)
{
_mimeToFactoryMap.Remove(mimeType);
}
/// <summary>
/// Create a message. This looks up the MIME type from the content header and instantiates the appropriate
/// concrete message type.
/// </summary>
/// <param name="messageNbr">the AMQ message id</param>
/// <param name="redelivered">true if redelivered</param>
/// <param name="contentHeader">the content header that was received</param>
/// <param name="bodies">a list of ContentBody instances</param>
/// <returns>the message.</returns>
/// <exception cref="AMQException"/>
/// <exception cref="QpidException"/>
public AbstractQmsMessage CreateMessage(long messageNbr, bool redelivered,
ContentHeaderBody contentHeader,
IList bodies)
{
BasicContentHeaderProperties properties = (BasicContentHeaderProperties)contentHeader.Properties;
if ( properties.ContentType == null )
{
properties.ContentType = "";
}
IMessageFactory mf = GetFactory(properties.ContentType);
return mf.CreateMessage(messageNbr, redelivered, contentHeader, bodies);
}
/// <summary>
/// Create a new message of the specified type
/// </summary>
/// <param name="mimeType">The Mime type</param>
/// <returns>The new message</returns>
public AbstractQmsMessage CreateMessage(string mimeType)
{
if ( mimeType == null || mimeType.Length == 0 )
throw new ArgumentNullException("mimeType");
IMessageFactory mf = GetFactory(mimeType);
return mf.CreateMessage(mimeType);
}
/// <summary>
/// Construct a new registry with the default message factories registered
/// </summary>
/// <returns>a message factory registry</returns>
public static MessageFactoryRegistry NewDefaultRegistry()
{
MessageFactoryRegistry mf = new MessageFactoryRegistry();
mf.RegisterFactory("text/plain", new QpidTextMessageFactory());
mf.RegisterFactory("text/xml", new QpidTextMessageFactory());
mf.RegisterFactory("application/octet-stream", new QpidBytesMessageFactory());
mf.DefaultFactory = new QpidBytesMessageFactory();
return mf;
}
private IMessageFactory GetFactory(string mimeType)
{
IMessageFactory mf = (IMessageFactory)_mimeToFactoryMap[mimeType];
return mf != null ? mf : _defaultFactory;
}
}
}
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