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Resolving Symbolic References in a CodeDOM (Part 7)

, 2 Dec 2012
Resolving symbolic references in a CodeDOM.
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Loops
Methods
OperatorDecls
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Resolving
Utilities
Mono.Cecil
Reflection
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CodeDOM
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Base
Comments
Base
DocComments
CodeRef
Base
List
Name
Base
Other
Simple
CompilerDirectives
Base
Conditionals
Base
Messages
Base
Pragmas
Base
Symbols
Base
Base
Expressions
AnonymousMethods
Base
Operators
Base
Binary
Arithmetic
Base
Assignment
Base
Bitwise
Base
Conditional
Relational
Base
Shift
Base
Other
Base
Unary
Base
Other
References
Base
GotoTargets
Base
Methods
Namespaces
Other
Properties
Types
Base
Variables
Base
Projects
Namespaces
References
Base
Statements
Base
Conditionals
Base
Exceptions
Generics
Constraints
Base
Iterators
Base
Jumps
Loops
Methods
OperatorDecls
Miscellaneous
Namespaces
Properties
Base
Events
Types
Base
Variables
Base
Properties
Resolving
Utilties
// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php

using System.Collections.Generic;
using System.Linq;
using System.Reflection;

namespace Nova.Utilities
{
    /// <summary>
    /// Static helper methods for <see cref="Assembly"/>.
    /// </summary>
    public static class AssemblyUtil
    {
        #region /* CONSTANTS */

        /// <summary>
        /// The name of the version part of a display name.
        /// </summary>
        public const string VersionTag = "Version=";

        /// <summary>
        /// The name of the internals-visible-to attribute.
        /// </summary>
        public const string InternalsVisibleToAttributeName = "InternalsVisibleToAttribute";

        #endregion

        #region /* STATIC HELPER METHODS */

        /// <summary>
        /// Determine if the specified assembly name is a display name.
        /// </summary>
        public static bool IsDisplayName(string assemblyName)
        {
            return assemblyName.Contains(",");
        }

        /// <summary>
        /// Get a normalized version of the specified assembly display name, including the name, Version (if any),
        /// Culture (if any), PublicKeyToken (null if none), and processorArchitecture (if not the default MSIL).
        /// </summary>
        public static string GetNormalizedDisplayName(string assemblyName)
        {
            AssemblyName name = new AssemblyName(assemblyName);
            string result = name.FullName;
            // Remove any PublicKeyToken tag if the value is null (assembly references might omit it)
            const string nullKey = ", PublicKeyToken=null";
            int index = result.IndexOf(nullKey);
            return (index > 0 ? result.Remove(index, nullKey.Length) : result);
        }

        /// <summary>
        /// Determine if the specified assembly name has a version number.
        /// </summary>
        public static bool HasVersion(string assemblyName)
        {
            return assemblyName.Contains(VersionTag);
        }

        /// <summary>
        /// Get the version number from an assembly display name.
        /// </summary>
        public static string GetVersion(string assemblyName)
        {
            int versionIndex = assemblyName.IndexOf(VersionTag);
            if (versionIndex > 0)
            {
                versionIndex += VersionTag.Length;
                int commaIndex = assemblyName.IndexOf(",", versionIndex);
                if (commaIndex < versionIndex)
                    commaIndex = assemblyName.Length;
                return assemblyName.Substring(versionIndex, commaIndex - versionIndex);
            }
            return null;
        }

        /// <summary>
        /// Determine if an <see cref="Assembly"/> has a custom attribute.
        /// </summary>
        /// <remarks>
        /// This method must be used instead of the built-in GetCustomAttributes() call when working with
        /// reflection-only assemblies (otherwise, the custom attribute type would be instantiated, which is illegal).
        /// </remarks>
        public static bool HasCustomAttribute(Assembly assembly, string name)
        {
            return Enumerable.Any(CustomAttributeData.GetCustomAttributes(assembly),
                delegate(CustomAttributeData customAttribute) { return customAttribute.Constructor.DeclaringType != null && customAttribute.Constructor.DeclaringType.Name == name; });
        }

        /// <summary>
        /// Get all custom attributes with the specified name from the <see cref="Assembly"/>.
        /// </summary>
        /// <remarks>
        /// This method must be used instead of the built-in GetCustomAttributes() call when working with
        /// reflection-only assemblies (otherwise, the custom attribute type would be instantiated, which is illegal).
        /// </remarks>
        public static List<CustomAttributeData> GetCustomAttributes(Assembly assembly, string name)
        {
            return Enumerable.ToList(Enumerable.Where(CustomAttributeData.GetCustomAttributes(assembly),
                delegate(CustomAttributeData customAttribute) { return customAttribute.Constructor.DeclaringType != null && customAttribute.Constructor.DeclaringType.Name == name; }));
        }

        /// <summary>
        /// Get the custom attributewith the specified name from the <see cref="Assembly"/>.  If there are multiple attributes with the name, the first one is returned.
        /// </summary>
        /// <remarks>
        /// This method must be used instead of the built-in GetCustomAttributes() call when working with
        /// reflection-only assemblies (otherwise, the custom attribute type would be instantiated, which is illegal).
        /// </remarks>
        public static CustomAttributeData GetCustomAttribute(Assembly assembly, string name)
        {
            return Enumerable.FirstOrDefault(CustomAttributeData.GetCustomAttributes(assembly),
                delegate(CustomAttributeData customAttribute) { return customAttribute.Constructor.DeclaringType != null && customAttribute.Constructor.DeclaringType.Name == name; });
        }

        #endregion
    }
}

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This article, along with any associated source code and files, is licensed under The Common Development and Distribution License (CDDL)

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About the Author

KenBeckett
Software Developer (Senior)
United States United States
I've been writing software since the late 70's, currently focusing mainly on C#.NET. I also like to travel around the world, and I own a Chocolate Factory (sadly, none of my employees are oompa loompas).

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