#nullable disable using System; using System.Reflection; namespace StardewModdingAPI.Framework.Reflection { /// A property obtained through reflection. /// The property value type. internal class ReflectedProperty : IReflectedProperty { /********* ** Fields *********/ /// The display name shown in error messages. private readonly string DisplayName; /// The underlying property getter. private readonly Func GetMethod; /// The underlying property setter. private readonly Action SetMethod; /********* ** Accessors *********/ /// public PropertyInfo PropertyInfo { get; } /********* ** Public methods *********/ /// Construct an instance. /// The type that has the property. /// The object that has the instance property (if applicable). /// The reflection metadata. /// Whether the property is static. /// The or is null. /// The is null for a non-static property, or not null for a static property. public ReflectedProperty(Type parentType, object obj, PropertyInfo property, bool isStatic) { // validate input if (parentType == null) throw new ArgumentNullException(nameof(parentType)); if (property == null) throw new ArgumentNullException(nameof(property)); // validate static if (isStatic && obj != null) throw new ArgumentException("A static property cannot have an object instance."); if (!isStatic && obj == null) throw new ArgumentException("A non-static property must have an object instance."); this.DisplayName = $"{parentType.FullName}::{property.Name}"; this.PropertyInfo = property; if (this.PropertyInfo.GetMethod != null) this.GetMethod = (Func)Delegate.CreateDelegate(typeof(Func), obj, this.PropertyInfo.GetMethod); if (this.PropertyInfo.SetMethod != null) this.SetMethod = (Action)Delegate.CreateDelegate(typeof(Action), obj, this.PropertyInfo.SetMethod); } /// public TValue GetValue() { if (this.GetMethod == null) throw new InvalidOperationException($"The {this.DisplayName} property has no get method."); try { return this.GetMethod(); } catch (InvalidCastException) { throw new InvalidCastException($"Can't convert the {this.DisplayName} property from {this.PropertyInfo.PropertyType.FullName} to {typeof(TValue).FullName}."); } catch (Exception ex) { throw new Exception($"Couldn't get the value of the {this.DisplayName} property", ex); } } /// public void SetValue(TValue value) { if (this.SetMethod == null) throw new InvalidOperationException($"The {this.DisplayName} property has no set method."); try { this.SetMethod(value); } catch (InvalidCastException) { throw new InvalidCastException($"Can't assign the {this.DisplayName} property a {typeof(TValue).FullName} value, must be compatible with {this.PropertyInfo.PropertyType.FullName}."); } catch (Exception ex) { throw new Exception($"Couldn't set the value of the {this.DisplayName} property", ex); } } } }