233 lines
9.1 KiB
C#
233 lines
9.1 KiB
C#
#region License
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/*
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* Copyright © 2002-2006 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#endregion
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using System;
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using System.Collections;
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using TIBCO.EMS;
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namespace Spring.Messaging.Ems.Support.Converter
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{
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/// <summary> A simple message converter that can handle TextMessages, BytesMessages,
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/// MapMessages, and ObjectMessages. Used as default by EmsTemplate, for
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/// <code>ConvertAndSend</code> and <code>ReceiveAndConvert</code> operations.
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///
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/// <p>Converts a String to a EMS TextMessage, a byte array to a EMS BytesMessage,
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/// a Map to a EMS MapMessage, and a Serializable object to a EMS ObjectMessage
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/// (or vice versa).</p>
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///
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///
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/// </summary>
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/// <author>Juergen Hoeller</author>
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/// <author>Mark Pollack (.NET)</author>
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public class SimpleMessageConverter : IMessageConverter
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{
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/// <summary> Convert a .NET object to a EMS Message using the supplied session
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/// to create the message object.
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/// </summary>
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/// <param name="objectToConvert">the object to convert
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/// </param>
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/// <param name="session">the Session to use for creating a EMS Message
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/// </param>
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/// <returns> the EMS Message
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/// </returns>
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/// <throws>EMSException if thrown by EMS API methods </throws>
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/// <throws>MessageConversionException in case of conversion failure </throws>
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public Message ToMessage(object objectToConvert, Session session)
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{
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if (objectToConvert is Message)
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{
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return (Message) objectToConvert;
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}
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if (objectToConvert is string)
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{
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return CreateMessageForString((string) objectToConvert, session);
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}
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if (objectToConvert is sbyte[])
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{
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return CreateMessageForByteArray((byte[]) objectToConvert, session);
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}
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if (objectToConvert is IDictionary)
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{
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return CreateMessageForMap((IDictionary) objectToConvert, session);
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}
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if (objectToConvert != null && objectToConvert.GetType().IsSerializable)
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{
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return CreateMessageForSerializable(objectToConvert, session);
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}
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throw new MessageConversionException("Cannot convert object [" + objectToConvert + "] to EMS message");
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}
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/// <summary> Convert from a EMS Message to a .NET object.</summary>
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/// <param name="messageToConvert">the message to convert
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/// </param>
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/// <returns> the converted .NET object
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/// </returns>
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/// <throws>MessageConversionException in case of conversion failure </throws>
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public object FromMessage(Message messageToConvert)
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{
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if (messageToConvert is TextMessage)
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{
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return ExtractStringFromMessage((TextMessage) messageToConvert);
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}
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if (messageToConvert is BytesMessage)
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{
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return ExtractByteArrayFromMessage((BytesMessage) messageToConvert);
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}
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if (messageToConvert is MapMessage)
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{
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return ExtractMapFromMessage((MapMessage) messageToConvert);
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}
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if (messageToConvert is ObjectMessage)
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{
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return ExtractSerializableFromMessage((ObjectMessage) messageToConvert);
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}
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return messageToConvert;
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}
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#region To Converter Methods
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/// <summary> Create a EMS TextMessage for the given String.</summary>
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/// <param name="text">the String to convert
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/// </param>
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/// <param name="session">current EMS session
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/// </param>
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/// <returns> the resulting message
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/// </returns>
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/// <throws> EMSException if thrown by EMS methods </throws>
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protected virtual TextMessage CreateMessageForString(string text, Session session)
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{
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return session.CreateTextMessage((text));
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}
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/// <summary> Create a EMS BytesMessage for the given byte array.</summary>
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/// <param name="bytes">the byyte array to convert
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/// </param>
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/// <param name="session">current EMS session
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/// </param>
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/// <returns> the resulting message
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/// </returns>
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/// <throws> EMSException if thrown by EMS methods </throws>
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protected virtual BytesMessage CreateMessageForByteArray(byte[] bytes, Session session)
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{
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BytesMessage message = session.CreateBytesMessage();
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message.WriteBytes(bytes);
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return message;
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}
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/// <summary> Create a EMS MapMessage for the given Map.</summary>
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/// <param name="map">the Map to convert
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/// </param>
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/// <param name="session">current EMS session
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/// </param>
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/// <returns> the resulting message
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/// </returns>
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/// <throws> EMSException if thrown by EMS methods </throws>
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protected virtual MapMessage CreateMessageForMap(IDictionary map, Session session)
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{
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MapMessage mapMessage = session.CreateMapMessage();
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foreach (DictionaryEntry entry in map)
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{
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if (!(entry.Key is string))
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{
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throw new MessageConversionException("Cannot convert non-String key of type [" +
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(entry.Key != null ? entry.Key.GetType().FullName : null) +
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"] to MapMessage entry");
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}
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mapMessage.SetObject(entry.Key.ToString(), entry.Value);
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}
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return mapMessage;
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}
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/// <summary> Create a EMS ObjectMessage for the given Serializable object.</summary>
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/// <param name="objectToSend">the Serializable object to convert
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/// </param>
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/// <param name="session">current EMS session
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/// </param>
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/// <returns> the resulting message
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/// </returns>
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/// <throws> EMSException if thrown by EMS methods </throws>
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protected virtual ObjectMessage CreateMessageForSerializable(
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object objectToSend, Session session)
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{
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return session.CreateObjectMessage(objectToSend);
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}
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#endregion
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#region From Converter Mehtods
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/// <summary> Extract a String from the given TextMessage.</summary>
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/// <param name="message">the message to convert
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/// </param>
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/// <returns> the resulting String
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/// </returns>
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/// <throws> EMSException if thrown by EMS methods </throws>
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protected virtual string ExtractStringFromMessage(TextMessage message)
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{
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return message.Text;
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}
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/// <summary> Extract a byte array from the given BytesMessage.</summary>
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/// <param name="message">the message to convert
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/// </param>
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/// <returns> the resulting byte array
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/// </returns>
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/// <throws> EMSException if thrown by EMS methods </throws>
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protected virtual byte[] ExtractByteArrayFromMessage(BytesMessage message)
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{
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byte[] bytes = new byte[(int)message.BodyLength];
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message.ReadBytes(bytes);
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return bytes;
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}
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/// <summary> Extract a IDictionary from the given MapMessage.</summary>
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/// <param name="message">the message to convert
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/// </param>
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/// <returns> the resulting Map
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/// </returns>
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/// <throws>EMSException if thrown by EMS methods </throws>
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protected virtual IDictionary ExtractMapFromMessage(MapMessage message)
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{
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IDictionary dictionary = new Hashtable();
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IEnumerator e = message.MapNames;
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while (e.MoveNext())
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{
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String key = (String)e.Current;
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dictionary.Add(key, message.GetObject(key));
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}
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return dictionary;
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}
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/// <summary>
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/// Extracts the serializable object from the given object message.
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/// </summary>
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/// <param name="message">The message to convert.</param>
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/// <returns>The resulting serializable object.</returns>
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protected virtual object ExtractSerializableFromMessage(
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ObjectMessage message)
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{
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return message.TheObject;
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}
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#endregion
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}
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}
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