/source/library/Interlace/Amf/AmfClassDescriptor.cs

#region Using Directives and Copyright Notice



// Copyright (c) 2007-2010, Computer Consultancy Pty Ltd

// All rights reserved.

// 

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are met:

//     * Redistributions of source code must retain the above copyright

//       notice, this list of conditions and the following disclaimer.

//     * Redistributions in binary form must reproduce the above copyright

//       notice, this list of conditions and the following disclaimer in the

//       documentation and/or other materials provided with the distribution.

//     * Neither the name of the Computer Consultancy Pty Ltd nor the

//       names of its contributors may be used to endorse or promote products

//       derived from this software without specific prior written permission.

// 

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 

// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 

// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 

// ARE DISCLAIMED. IN NO EVENT SHALL COMPUTER CONSULTANCY PTY LTD BE LIABLE 

// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 

// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 

// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 

// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 

// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 

// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH

// DAMAGE.



using System;

using System.Collections.Generic;

using System.Reflection;

using System.Text;



#endregion



namespace Interlace.Amf

{

    public class AmfClassDescriptor : IAmfClassDescriptor

    {

        Type _type;

        AmfClassAttribute _classAttribute;

        List<AmfPropertyDescriptor> _properties;



        AmfTraits _serializationTraits = null;



        public AmfClassDescriptor(Type type)

        {

            _type = type;



            object[] classAttributes = type.GetCustomAttributes(typeof(AmfClassAttribute), true);



            if (classAttributes.Length != 1) throw new ArgumentException("The specified type is not marked with the AmfClassAttribute.", "type");



            _classAttribute = classAttributes[0] as AmfClassAttribute;



            _properties = new List<AmfPropertyDescriptor>();



            foreach (PropertyInfo property in type.GetProperties())

            {

                object[] propertyAttributes = property.GetCustomAttributes(typeof(AmfPropertyAttribute), true);



                if (propertyAttributes.Length == 0) continue;



                AmfPropertyDescriptor descriptor = new AmfPropertyDescriptor(property, propertyAttributes[0] as AmfPropertyAttribute);



                _properties.Add(descriptor);

            }

        }



        public string Alias

        {

            get { return _classAttribute.Alias; }

        }



        public object BeginDeserialization(AmfTraits traits)

        {

            return Activator.CreateInstance(_type);

        }



        public void EndDeserialization(AmfTraits traits, object deserializingTo, IDictionary<string, object> staticMembers, IDictionary<string, object> dynamicMembers)

        {

            // Set the dynamic properties:

            if (traits.Kind == AmfTraitsKind.Dynamic)

            {

                if (!(deserializingTo is AmfObject)) throw new AmfException(string.Format(

                    "The AMF decoder received a dynamic object but the registered class for the object (\"{0}\") " +

                    "does not support dynamic properties (it does not inherit from AmfObject).", Alias));



                AmfObject amfObj = deserializingTo as AmfObject;



                foreach (KeyValuePair<string, object> pair in dynamicMembers)

                {

                    amfObj.Properties[pair.Key] = pair.Value;

                }

            }



            // Check for unexpected properties:

            if (_properties.Count != staticMembers.Count)

            {

                // (If the property count is equal and there is an unexpected property, there

                // must also be a missing property that will trigger later).



                Dictionary<string, bool> receivedProperties = new Dictionary<string, bool>();



                foreach (string key in staticMembers.Keys)

                {

                    receivedProperties[key] = true;

                }



                foreach (AmfPropertyDescriptor descriptor in _properties)

                {

                    foreach (string propertyName in descriptor.GetUsedPropertyNames(this))

                    {

                        if (!receivedProperties.ContainsKey(propertyName))

                        {

                            throw new AmfException(string.Format(

                                "The class registered for the alias \"{0}\" was received but was has an unexpected " +

                                "property (\"{1}\").", Alias, propertyName));

                        }

                    }

                }

            }



            foreach (AmfPropertyDescriptor descriptor in _properties)

            {

                descriptor.DeserializeProperty(this, deserializingTo, staticMembers);

            }

        }



        public void SerializeObject(object value, out AmfTraits traits, out IDictionary<string, object> staticMembers, out IDictionary<string, object> dynamicMembers)

        {

            if (_serializationTraits == null)

            {

                List<string> memberNames = new List<string>();



                foreach (AmfPropertyDescriptor property in _properties)

                {

                    memberNames.AddRange(property.GetUsedPropertyNames(this));

                }



                _serializationTraits = new AmfTraits(_classAttribute.Alias,

                    _type.IsSubclassOf(typeof(AmfObject)) ? AmfTraitsKind.Dynamic : AmfTraitsKind.Static, memberNames.ToArray());

            }



            traits = _serializationTraits;



            if (_serializationTraits.Kind == AmfTraitsKind.Dynamic)

            {

                dynamicMembers = (value as AmfObject).Properties;

            }

            else

            {

                dynamicMembers = null;

            }



            staticMembers = new Dictionary<string, object>();



            foreach (AmfPropertyDescriptor property in _properties)

            {

                property.SerializeProperty(this, value, staticMembers);

            }

        }

    }

}