/source/library/Interlace/Utilities/ReflectionHelper.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.Utilities

{

    public static class ReflectionHelper

    {

        public static AttributedProperty<TAttribute> 

            WrapAttributedProperty<TAttribute>(PropertyInfo property) where TAttribute : Attribute

        {

            if (property == null) return null;



            object[] attributes = property.GetCustomAttributes(typeof(TAttribute), true);



            if (attributes.Length == 0) return null;



            if (attributes.Length > 1)

            {

                throw new InvalidOperationException("An object property passed to " +

                    "ReflectionHelper.GetAttributedProperties has multiple instances of " +

                    "an attribute, which is not supported.");

            }



            TAttribute attribute = attributes[0] as TAttribute;



            return new AttributedProperty<TAttribute>(property, attribute);

        }



        public static ICollection<AttributedProperty<TAttribute>> 

            GetAttributedProperties<TAttribute>(Type type) where TAttribute : Attribute

        {

            List<AttributedProperty<TAttribute>> properties = new List<AttributedProperty<TAttribute>>();



            foreach (PropertyInfo property in type.GetProperties())

            {

                AttributedProperty<TAttribute> attributed =

                    WrapAttributedProperty<TAttribute>(property);



                if (attributed != null) properties.Add(attributed);

            }



            return properties;

        }



        public static AttributedMethod<TAttribute> 

            WrapAttributedMethod<TAttribute>(MethodInfo method) where TAttribute : Attribute

        {

            if (method == null) return null;



            object[] attributes = method.GetCustomAttributes(typeof(TAttribute), true);



            if (attributes.Length == 0) return null;



            if (attributes.Length > 1)

            {

                throw new InvalidOperationException("An object property passed to " +

                    "ReflectionHelper.GetAttributedMethods has multiple instances of " +

                    "an attribute, which is not supported.");

            }



            TAttribute attribute = attributes[0] as TAttribute;



            return new AttributedMethod<TAttribute>(method, attribute);

        }





        public static ICollection<AttributedMethod<TAttribute>> 

            GetAttributedMethods<TAttribute>(Type type) where TAttribute : Attribute

        {

            List<AttributedMethod<TAttribute>> methods = new List<AttributedMethod<TAttribute>>();



            foreach (MethodInfo method in type.GetMethods())

            {

                AttributedMethod<TAttribute> attributed =

                    WrapAttributedMethod<TAttribute>(method);



                if (attributed != null) methods.Add(attributed);

            }



            return methods;

        }

    }

}