src/OneScript.Core/Values/PropertyValueReference.cs - develop - EvilBeaver/OneScript

src/OneScript.Core/Values/PropertyValueReference.cs

72 строки3 KB

Andrei Ovsiankin

Тест доступности ЭтотОбъект только на чтение

02 июн 2024, 21:43

02 июн 2024, 21:43a38a42d

/*----------------------------------------------------------
This Source Code Form is subject to the terms of the
Mozilla Public License, v.2.0. If a copy of the MPL
was not distributed with this file, You can obtain one
at http://mozilla.org/MPL/2.0/.
----------------------------------------------------------*/
using System;
using OneScript.Contexts;
using OneScript.Exceptions;
using ScriptEngine.Machine;

namespace OneScript.Values
{
    public class PropertyValueReference : IValueReference
    {
        private readonly IRuntimeContextInstance _context;
        private readonly int _contextPropertyNumber;
        
        public PropertyValueReference(IRuntimeContextInstance context, string propertyName)
        {
            _context = context;
            _contextPropertyNumber = context.GetPropertyNumber(propertyName);
        }
        
        public PropertyValueReference(IRuntimeContextInstance context, int propertyId)
        {
            _context = context;
            _contextPropertyNumber = propertyId;
        }

        public bool Equals(IValueReference other)
        {
            if (ReferenceEquals(null, other)) return false;
            if (ReferenceEquals(this, other)) return true;
            if (!(other is PropertyValueReference prop))
                return false;
            return _context.Equals(prop._context) && _contextPropertyNumber == prop._contextPropertyNumber;
        }

        public override bool Equals(object obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            return obj.GetType() == this.GetType() && Equals((PropertyValueReference)obj);
        }

        public override int GetHashCode()
        {
            return HashCode.Combine(_context, _contextPropertyNumber);
        }

        public IValue Value
        {
            get
            {
                if (_context.IsPropReadable(_contextPropertyNumber))
                    return (BslValue)_context.GetPropValue(_contextPropertyNumber);
                
                throw PropertyAccessException.PropIsNotReadableException(PropertyName());
            }
            set
            {
                if(_context.IsPropWritable(_contextPropertyNumber))
                    _context.SetPropValue(_contextPropertyNumber, value);
                else
                    throw PropertyAccessException.PropIsNotWritableException(PropertyName());
            }
        }

        private string PropertyName() => _context.GetPropertyInfo(_contextPropertyNumber).Name;
    }
}