RuntimeMirandaJavaMethod.cs

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/*
  Copyright (C) 2002-2014 Jeroen Frijters
 
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.
 
  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:
 
  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
 
  Jeroen Frijters
  jeroen@frijters.net
  
*/
using IKVM.Attributes;
 
#if IMPORTER || EXPORTER
using IKVM.Reflection.Emit;
#else
using System.Reflection.Emit;
#endif
 
namespace IKVM.Runtime
{
 
    abstract class RuntimeMirandaJavaMethod : RuntimeSmartJavaMethod
    {
 
        sealed class AbstractMirandaMethodWrapper : RuntimeMirandaJavaMethod
        {
 
            internal AbstractMirandaMethodWrapper(RuntimeJavaType declaringType, RuntimeJavaMethod ifmethod) :
                base(declaringType, ifmethod, Modifiers.Public | Modifiers.Abstract)
            {
 
            }
 
        }
 
        sealed class DefaultMirandaMethodWrapper : RuntimeMirandaJavaMethod
        {
 
            internal DefaultMirandaMethodWrapper(RuntimeJavaType declaringType, RuntimeJavaMethod ifmethod) :
                base(declaringType, ifmethod, Modifiers.Public)
            {
 
            }
 
        }
 
        sealed class ErrorMirandaMethodWrapper : RuntimeMirandaJavaMethod
        {
 
            string error;
 
            internal ErrorMirandaMethodWrapper(RuntimeJavaType declaringType, RuntimeJavaMethod ifmethod, string error) :
                base(declaringType, ifmethod, Modifiers.Public)
            {
                this.error = error;
            }
 
            protected override RuntimeMirandaJavaMethod AddConflictError(RuntimeJavaMethod mw)
            {
                error += " " + mw.DeclaringType.Name + "." + mw.Name;
                return this;
            }
 
            internal override string Error
            {
                get { return error; }
            }
 
        }
 
        readonly RuntimeJavaMethod ifmethod;
 
        RuntimeMirandaJavaMethod(RuntimeJavaType declaringType, RuntimeJavaMethod ifmethod, Modifiers modifiers) :
            base(declaringType, ifmethod.Name, ifmethod.Signature, null, null, null, modifiers, MemberFlags.HideFromReflection | MemberFlags.MirandaMethod)
        {
            this.ifmethod = ifmethod;
        }
 
        internal static RuntimeMirandaJavaMethod Create(RuntimeJavaType declaringType, RuntimeJavaMethod ifmethod)
        {
            var dmmw = ifmethod as DefaultMirandaMethodWrapper;
            if (dmmw != null)
                return new DefaultMirandaMethodWrapper(declaringType, dmmw.BaseMethod);
 
            return ifmethod.IsAbstract ? new AbstractMirandaMethodWrapper(declaringType, ifmethod) : new DefaultMirandaMethodWrapper(declaringType, ifmethod);
        }
 
        internal RuntimeMirandaJavaMethod Update(RuntimeJavaMethod mw)
        {
            if (ifmethod == mw)
            {
                // an interface can be implemented multiple times
                return this;
            }
            else if (ifmethod.DeclaringType.ImplementsInterface(mw.DeclaringType))
            {
                // we can override a base interface without problems
                return this;
            }
            else if (mw.DeclaringType.ImplementsInterface(ifmethod.DeclaringType))
            {
                return Create(DeclaringType, mw);
            }
            else if (!ifmethod.IsAbstract && !mw.IsAbstract)
            {
                return AddConflictError(mw);
            }
            else if (!ifmethod.IsAbstract && mw.IsAbstract)
            {
                return new ErrorMirandaMethodWrapper(DeclaringType, mw, DeclaringType.Name + "." + Name + Signature);
            }
            else
            {
                return this;
            }
        }
 
        protected virtual RuntimeMirandaJavaMethod AddConflictError(RuntimeJavaMethod mw)
        {
            return new ErrorMirandaMethodWrapper(DeclaringType, ifmethod, "Conflicting default methods:")
                .AddConflictError(ifmethod)
                .AddConflictError(mw);
        }
 
        internal bool IsConflictError
        {
            get { return Error != null && Error.StartsWith("Conflicting default methods:"); }
        }
 
        internal RuntimeJavaMethod BaseMethod
        {
            get { return ifmethod; }
        }
 
        internal virtual string Error
        {
            get { return null; }
        }
 
#if EMITTERS
 
        protected override void CallImpl(CodeEmitter ilgen)
        {
            ilgen.Emit(OpCodes.Call, GetMethod());
        }
 
        protected override void CallvirtImpl(CodeEmitter ilgen)
        {
            ilgen.Emit(OpCodes.Callvirt, GetMethod());
        }
 
#endif // EMITTERS
 
    }
 
}