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path: root/src/SMAPI/Framework/ModLoading/AssemblyDefinitionResolver.cs
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using System.Collections.Generic;
using Mono.Cecil;

namespace StardewModdingAPI.Framework.ModLoading
{
    /// <summary>A minimal assembly definition resolver which resolves references to known assemblies.</summary>
    internal class AssemblyDefinitionResolver : DefaultAssemblyResolver
    {
        /*********
        ** Fields
        *********/
        /// <summary>The known assemblies.</summary>
        private readonly IDictionary<string, AssemblyDefinition> Lookup = new Dictionary<string, AssemblyDefinition>();


        /*********
        ** Public methods
        *********/
        /// <summary>Add known assemblies to the resolver.</summary>
        /// <param name="assemblies">The known assemblies.</param>
        public void Add(params AssemblyDefinition[] assemblies)
        {
            foreach (AssemblyDefinition assembly in assemblies)
                this.AddWithExplicitNames(assembly, assembly.Name.Name, assembly.Name.FullName);
        }

        /// <summary>Add a known assembly to the resolver with the given names. This overrides the assembly names that would normally be assigned.</summary>
        /// <param name="assembly">The assembly to add.</param>
        /// <param name="names">The assembly names for which it should be returned.</param>
        public void AddWithExplicitNames(AssemblyDefinition assembly, params string[] names)
        {
            this.RegisterAssembly(assembly);
            foreach (string name in names)
                this.Lookup[name] = assembly;
        }

        /// <summary>Resolve an assembly reference.</summary>
        /// <param name="name">The assembly name.</param>
        public override AssemblyDefinition Resolve(AssemblyNameReference name)
        {
            return this.ResolveName(name.Name) ?? base.Resolve(name);
        }

        /// <summary>Resolve an assembly reference.</summary>
        /// <param name="name">The assembly name.</param>
        /// <param name="parameters">The assembly reader parameters.</param>
        public override AssemblyDefinition Resolve(AssemblyNameReference name, ReaderParameters parameters)
        {
            return this.ResolveName(name.Name) ?? base.Resolve(name, parameters);
        }


        /*********
        ** Private methods
        *********/
        /// <summary>Resolve a known assembly definition based on its short or full name.</summary>
        /// <param name="name">The assembly's short or full name.</param>
        private AssemblyDefinition ResolveName(string name)
        {
            return this.Lookup.TryGetValue(name, out AssemblyDefinition match)
                ? match
                : null;
        }
    }
}